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基于matlab的离合器优化设计程序

2023-07-14 16:30:27
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车辆离合器碟形弹簧性能优化及CAD系统开发

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来源: 作者:邵忍平 黄欣娜 吴永利 隆凤明 关键词:离合器,CAD

碟形弹簧轴向尺寸小、承载能力大、具有变刚度的非线性特性,因而在引进设备中获得广泛应用,特别是近年来在引进车辆的主离合器中,越来越多地采用了碟簧,以实现动力传递的分离与结合,因此,碟形弹簧设计的优劣,直接影响到车辆的使用性能。

为此,本文就碟簧工作特性、优化设计及CAD方法进行讨论。同时开发了实用碟簧优化软件,根据优化结果对其进行了CAD设计,绘制了各种碟簧载荷与变形特性曲线、应力与变形曲线和碟簧零件工作图。为便于用户使用,软件中采用中西文结合方式,设计了两级彩色界面菜单,从而形成了碟簧优化及CAD软件系统。这对于碟簧一体化设计及实现引进车辆离合器的国产化都具有重要意义。

碟形弹簧的变形特性

图1是碟簧的变形特性曲线。b点是离合器摩擦片未磨损时处于接合状态的工作点,该点应保证碟簧具有足够的压紧力,具备适当的储备系数。P点为碟簧被压平时的工作点,故b点应选择在曲线SP之间。当摩擦片磨损Δλ后,碟簧工作点由b移到a点,这时应使压紧力Pa接近于Pb,以保证离合器储备系数基本不变。d点为离合器彻底分离后碟簧工作点,为了保证操纵时较小的踏板力,分离点d应靠近载荷最小点c。

碟簧特性计算的有关公式

载荷P与变形λ的关系式以及出现在碟簧内圆周上边缘处的最大应力为

(1)

(2)

图1

式中:

E——材料弹性模量;

μ——材料波松比;

H——碟簧部分内截锥高;

h——碟簧厚度;

Re——碟簧外半径;

Ri——碟簧部分内半径;

Re1——碟簧与压盘接触半径;

Ri1——支承环平均半径;

Rf——分离轴承作用半径;

β2——分离爪根部宽度系数。

碟簧必须保证离合器接合时可靠地传递发动机最大转矩,则其工作载荷为

Pb=βMemax/(fRcZc) (3)

式中:β——离合器储备系数;

Memax——发动机最大输出扭矩;

f——摩擦系数;

Rc——摩擦片平均半径;

Zc——摩擦片总工作面数。

图2

碟簧优化数学模型及方法

3.1 设计变量及目标函数

碟簧的内锥高度H、厚度h以及碟簧部分内半径Ri对其工作性能有显著的影响。另外,分离点与压紧点变形λD和λb也是影响性能的主要因素,因此,考虑到结构与工作参数,确定设计变量为H、h、Ri、λb、λf,即X=[x1,x2,x3,x4,x5]=[H、h、Ri、λb、λf]。

对于车辆离合器,由于频繁接合与分离,导致摩擦片磨损,引起压力下降,使传递的扭矩出现不稳定现象。为保证离合器的储备系数及其工作可靠性,将摩擦片磨损前后碟簧工作载荷变化(|Pa-Pb|)作为一个目标函数。离合器另一个重要特性是操作的轻便性,故分离时踏板力不能过大,碟簧分离力也作为一个目标函数

式中:

Δs——每个摩擦片允许最大磨损量;

λD=λb+λf

δ1、δ2——加权因子。

3.2 约束条件

(1)碟簧的高厚比H/h对其特性影响最大,只有当它控制在一定范围内时才具有负刚度。故

(2)摩擦片寿命要求压强不能过高,必须低于许用应力〔q〕

(3)在载荷Pb作用下碟簧变形应符合λs<λb<λp,λp=H,λs为碟簧最大载荷处变形。由式(1)得

(4)离合器彻底分离时,碟簧工作点d应靠近c点,即λd-λc

(5)碟簧强度要求

在此将强度条件作为模糊问题来处理,现引入扩增系数β(β=1.05~1.30),通过计算其模糊强度条件为:σmax(λD)<β〔σ〕-80λ*,λ*为最优水平截集。

g7(X)=β〔σ〕-80λ-σmax(λD)>0

(6)碟簧结构及工艺要求

1.2

0.15

g8(X)=Re/x3-1.2>0

g9(X)=1.8-Re/x3>0;

g10(X)=x1/(Re-x3)-0.15>0

g11(X)=0.28-x1/(Re-x3)>0

(7)碟簧变形限制

1.8<λb<13 1.0<λf<11

g12(X)=x4-1.8>0

g13(X)=13-x4>0

g14(X)=x5-1.0>0

g15(X)=11-x5>0

(8)边界条件要求

tgα=H/(Re-Ri);5°<α<11°;5

g16(X)~g23(X)

(9)碟簧工作载荷满足离合器要求

P(λb)=Pb

h1(X)=Pb-P(x4)=0

3.3 优化方法

综上所述,建立起23个不等式约束、1个等式约束、2个目标函数所组成的5维非线性优化数学模型,即

(5)

在此采用混合罚函数法进行优化,其表达式为

通过以上方法完成了优化软件,经过计算可得结果。

碟形弹簧CAD

通过上述的优化可得碟簧的H、h、Ri、λb和λf,从而可计算出所有的结构参数及性能参数,并且通过改变其内外径比可得到不同规格的碟簧,形成一个全系列设计。在此基础上可绘制出碟簧的工作特性曲线、应力变形曲线及零件工作图等,将优化结果以图纸及数据形式输出。另外,CAD软件中还设计出了二级用户界面菜单,并带有三维立体字显示,供用户选用。上述CAD程序软件,均采用Turbo C语言编写,在Turbo C 2.0集成开发环境下运行,以完成从查阅源程序、修改原始数据、运行优化程序、查阅运行结果,直到绘制特性曲线图以及零件图的全部过程,形成优化及CAD软件系统。

实例分析与讨论

某车辆离合器及碟簧有关参数为:N=14.7kW;n=2000r/min;β=1.7;f=0.25;Zc=2;Δs=1.0mm;e=0.2,μ=0.3;〔q〕=7MPa;〔σ〕=1570MPa;E=2.06×105MPa。通过优化和CAD分析得到其结果如表1和图3~图5所示。

图3 碟簧载荷变形图

可见,当离合器传递扭矩相同的情况下,碟簧优化的结构尺寸基本相同,不随m=Re/Ri的变化而变化,但压力、变形、应力以及碟簧外径则随m不同而变化。当m增大时,压力Pb和Pa也随之增大,而碟簧外径De=2Re以及Ri随之变小,这是由于外径减小时,只有Ri减小,才具备足够的摩擦面积,方能满足传递相同扭矩的要求,当然压力肯定是要增大的,也就是说,当结构尺寸较大时宜选小m值、当结构尺寸较小时选用较大m为好,这样碟簧压力变化ΔP较小、分离力也较小,如表1中m=1.2和1.4两组优化 结果。当m=1.7时碟簧压力变化达到23.92%,这种结果不可取,故建议m取值在1.2~1.6之间为好。因此碟簧的选取原则可按以下进行:对于大功率的结构尺寸较大的车辆离合器,碟簧宜选小m值,而对于小功率结构尺寸较小的离合器,碟簧宜选较大m值。

图4 碟簧应力变形图

图5 碟簧零件工作图

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一种基于MATLAB的模糊控制器综合优化设计与仿真分析的实现方法.

该方法首先利用MATLAB中的模糊系统工具箱结合MATLAB函数构建控制规则可调整的模糊控制器,然后利用最优化工具箱优化模糊控制器的控制规则和参数,从而提高设计模糊控制器的效率.最后利用仿真连接器建立系统仿真模型并在单位阶跃输入信号作用下仿真分析系统动态性能和优化设计结果.仿真表明,控制规则及参数优化后,系统阶跃响应特性基本上能达到"快速-无超调"的设计目标.

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2023-07-14 11:20:455

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引擎系统(Automotive Engine System) 燃烧室(Combustion Chamber) 活塞到达上死点后其顶部与汽缸盖之间的空间,燃料即在此室燃烧。 压缩比(Compression Ratio) 活塞在下死点的汽缸之总容积除以活塞在上死点的总容积(燃烧室容积),所得的值就称为压缩比。 连杆(Connecting Rod) 引擎中连接曲轴与活塞的连接杆。 冷却系统(Cooling System) 可藉冷却剂的循环,将多余的热量移出引擎,以防止过热的系统。在水冷式的引擎中,包括水套、水泵、水箱及节温器。 曲轴箱(Crankcase) 引擎下部,为曲轴运转的地方,包括汽缸体的下部和油底壳。 曲轴(Crankshaft) 引擎的主要旋转机件,装上连杆后,可承接连杆的上下(往复)运动变成循环(旋转)运动。 曲轴齿轮(Crankshaft Gear) 装在曲轴前端的齿轮或键齿轮,通常用来代动凸轮轴齿轮,链条或齿状皮带。 汽缸体(Cylinder Block) 引擎的基本结构,引擎所有的零附件都装在该机件上,包括引擎汽缸及曲轴箱的上半部。 汽缸盖(Cylinder Head) 引擎的盖子及封闭汽缺的机件,包括水套和汽门及冷却片。 爆震(Detonation) 为火焰的撞击或爆声,在火花点火引擎的燃烧室内,因为压过的空气燃料混合气会自燃,于是使部份未燃的混合气产生二次点火(在火星塞点火之后),因而发出了爆声。 排气量(Displacemint) 在引擎的某一循环运作中,能将全部空气及混合气送入所有汽缸的能力,也是指一个活塞从一个行程运作至另一行程所能排的体积。 引擎(Engine) 一种能将热能转变为机械能的机械:一种可将燃料燃烧产生机械动力的装置;有时可视为一种发动机。 风扇皮带(Fan Belt) 一种由曲轴带动的皮带,其主要目的是带动引擎风扇和水泵。 浮筒油面高度(Float Level) 化油器浮筒室内,浮筒浮起而顶住针阀,堵住进油口,使油不再流入浮筒室时,油面的高度。 四行程引擎(Four-Stroke Cycle) 进气、压缩、动力、排气四个行程。四个行程调一完整的循环。 垫片(Gasket) 用纸、橡皮片或铜片制成,放在两平面之间以加强密封的材料。 齿轮润滑油(Gear Lubricant) 一种可润滑齿轮的机油,通常为SAE90号机油。 热控制阀(Heat-Control Valve) 在引擎排气歧管中一种节温操作阀门,可在引擎未达正常工作温度之前,将废气的热导入进气歧管。 敲击(Knock) 随引擎速度出现的金属撞击声,通常是因轴承松脱或磨损所产生。 主轴承(Main Bearing) 引擎内支撑曲轴的轴承。 歧管压力(Manifold Pressure) 涡轮增压器运作时位于进气歧管内的压力。 歧管真空(Manifold Vacuum) 指进气歧管内的真空,即汽缸在进气行程中所产生的真空。 油底壳(Oil Pan) 位于引擎下部:可拆装,并将由轴箱密封做为贮油槽的外壳。 机油滤清器(Oil filter) 一种在机油通过时便可将污物滤下的装置。 机油泵(Oil Pump) 在润滑系统中,可迫使机油自油底壳送到引擎运动件的装置。 爆声(Ping) 引擎在加速时所产生的爆震现象,此因点火正时提前太多或燃料的辛烷值过低所致。 活塞(Piston) 一种装在汽缸内活动的机件,能在压力改变时接受或传递动力。就引擎而言是指在汽缸内上下滑动,并藉助连杆,迫使曲轴旋转的圆形机件。 活塞梢(Piston Pin) 一种管状的金属块,可将活塞或连杆连接。 活塞环(Piston Ring) 崁入活塞槽沟的环,分为两种:压缩环和机油环。压缩环可用来密封燃烧室内的压缩空气;机油环则用来刮除汽缸上多余的机油。 压力水箱盖(Pressure Cap) 一种附有阀门的水箱盖,可使冷却系统在压力下,保持较高或更有效率的温度。 散热器(Radiator) 冷却系统中,可将热气自冷却器消除的装置,亦即吸收引擎过热的冷却液,并将低温冷却液送到引擎的装置。 火星塞(Spark plug) 为两电极及一绝缘体组合而成,可提供引擎汽函火花点火的一种零件。 火花测试(Spark Test) 一种点火系统的快速检查方法。先将高压线的金属端接近汽函盖6mm处,而后起动引擎,检查火花发生的情形。 增压器(SuperCharger) 引擎进气系统内,将进入的空气或空气燃油混合比加以压力的泵。如此增加可燃的燃油量,而增进引擎动力。 节温器(Thermostat) 为一自动调温装置,通常含有感温组件,借着膨胀或冷缩来开启、关掉空气、气体或液体的流动。 涡轮增压器(Turbocharger) 藉引擎排气所驱动的一种增压器,马力通常可增25~30%。 二行程循(Two-Stroke Cycle) 二行程循环引擎,其燃油进入、压缩、燃烧与排气陆续发生在两活塞行程之间。 汽门间隙(Valve Clearance) OHC引擎中,摇臂与汽门杆顶的间隙。汽门机构中,关闭的汽门之间隙。 汽门正时(Valve Tming) 配合活塞位置使汽门开或关的正时。 汽门机构(Valve Train) 引擎的汽门操值机构,从凸轮轴至汽门的机件包括在内。 减震器(Vibration Damper) 与引震曲轴相接的装置,用来抗衡曲轴的扭转振动(即曲轴受汽缸点火的冲击力而扭动的现象)。 废汽门(Wastegate) 涡轮增压器中的控制装置,可限制压力升高,以避免引擎和滑轮增压器的损坏。 水套(Water Jackets) 指汽缸体和汽缸盖的内外壳间之空间,冷却液即在其间循环。 水泵(Water Pump) 在冷却系统中,水泵的作用使冷却液在引擎水套和水箱之间不断循环。 2、传动系统(Drive Line System) F.F.式车辆(Front Engine Front Drive) 表示前置引擎前轮驱动的车辆,目前小轿车多采用此种装置,它的优点是加速传动较轻快,高速行驶直线性较佳,车内空间可加大,缺点是车辆前半部较重,增加前轮的负担,且左右两根传动轴较易损坏,增加保养费。 F.R.式车辆(Front Engine Rear Drive) 表示前置引擎后轮驱动的车辆,它的优点是传动系统较坚固耐用,爬坡性较佳保养费较低,缺点为车内空间较小,加速较不轻快。 离合器(Clutch System) 系将来自引擎的动力,给予传达,或予截断的机构,使用于截断与变速机构之连结使引擎起动,或使引擎处于旋转状态停车,或变速机构的齿轮之变换,或将离合器接续做车辆徐徐出发等。 飞轮(Flywheel) 装置在曲柄轴的一端,是铸铁制造较重的轮盘,在爆发冲程传递回转力,由飞轮一时吸收储蓄,供给在下次动力冲程,能使曲柄轴圆滑回转作用,外环的齿环可供起动时摇转引擎之用,背面与离合器片接触,成为离合器总成的组件。 离合器片(Clutch Disc, Clutch) 作为传递引擎动力到变速箱的媒介物。 液压式离合器系统(Cable-Operated Control System) 利用特殊钢绳,连接踏板与释放杆间,作为切断或接通的连杆机构。 手排档变速箱(Manual Transmission) 需要离合器配合操纵的变速机构,可依车辆行走阻力的变化,变换引擎的扭矩,使车辆正常行驶。 自动排档变速箱(Automatic Transmission) 没有装置操作变速机的离合器机构,操纵机构是没有选择杆(Selecter),附有P(停车)、R(倒车)、N(空档)、D(高速)、L(低速)等记号。 速率表(Speedometer Drive) 表示轮轴回转数的仪表,每辆汽车都必须配备,可供驾驶人员随时注意车速,通常装于驾驶室,以显示状况,另一端连接到变速箱的输出轴。 同步啮合式变速机(Synchro-Mesh Type Transmission) 一般用于手排变速箱内,在齿轮啮合前先由设置在两齿轮的摩擦圆锥体机构接触,使两个齿轮在啮合前其回转成一致后,同时啮合方式的变速箱,通常在第一档到第二档,第二档到第三档,或第三档到第四档时才有此种装置,倒文件并没有。 行星齿轮装置(Planetary Gear System) 属于自动变速箱内的齿轮组,如太阳系运动状况组成的齿轮,有太阳齿轮、行星齿轮、环齿轮、行星齿轮架所构成,由液压控制,由选择而可获得各种减速比。 超速传动(Overdrive) 使变速箱的输出轴回转数超过引擎的转速,可降低燃料消耗量,噪音,震动均随之减少的装置。一般称O/D档,即第五档,自动变速箱亦有加装此装置。 差速器(Differential) 传递推进轴的回转动力至后左右轮所需之差异的旋转速度,使汽车能够自由转弯行驶的一种齿轮装置。 万向接头(Universal Joint) 可让动力传送到成一角度的二个轴,其中包括二支Y型轭及一个叫做十字轴架的十字型构件。 滑动接头(Slip Joint) 有外栓槽和内栓槽与二轴连接。栓槽不但可以使两轴一起转动,且也可以允许二轴沿轴线作有限度的移动,亦即可应付传动轴的长度变化。 传动轴(Drive Shaft) 连接或装配各项配件而可移动或转动的圆形物体配件,一般均使用轻而抗扭性佳的合金钢管制成。 四轮驱动(Four-wheel Drive) 许多汽车及一些卡车使用四轮驱动,也就是说。引擎动力可传送到四个轮子,因此车辆可越野行驶,也可以爬陡峭的斜坡,甚至可以在崎岖不平或泥泞的地上行驶。 车(主动)轴(Axle Shaft) 多使用在前轮驱动汽车上,除了可传轮由变速箱来的动力到左右两前轮外,还需配合转向角度的改变。 3、刹车系统(Brake System) 主刹车系统(Service Brake System) 汽车行驶时常用之刹车都是脚操作,故又称脚刹车(Foot Brake)。驾驶人踩下刹车踏板后即由机械或液压将刹车力传到车轮之制动装置使产生磨擦作用。 驻车刹车系统(Parking Brake System) 驻车刹车又称手刹车,为汽车停驻时,防止车辆滑行之制动装置。一般有装在传动轴之中间制动式,及直接控制后轮制动式两种。 刹车总泵(Master Cylinder)及刹车分泵(Wheel Cylinder) 油压刹车的主要配合部份,其上面有储蓄刹车油的槽池,下方是汽缸内配有活塞。活塞是在缸内受刹车踏板再经推杆起作用,将缸内的刹车油压传至各轮分缸,亦是油压刹车装置,配置在各车轮内的制动缸。 动力刹车器(Power-Brake) 以引擎真空及油压操纵Booster等作用补助刹车力量的刹车。 刹车来令(Brake Lining) 刹车蹄片上的制动表面所张贴的摩擦材料,一般大型汽车是以铆钉固定,而小型车则用粘剂加压张贴之。 刹车蹄片(Brake Shoes) 受刹车凸轮或推杆的作用量被推向外展开压制刹车鼓,而起制动作用的配件,其形状似如半月形。 鼓式刹车(Drum brakes) 由刹车底板、刹车分泵、刹车蹄片等有关连杆、弹簧、梢钉、刹车鼓所组成。目前仅普通采用于后轮。 碟式刹车(Disc Brakes) 使用金属块(碟)而不用鼓轮,在刹车碟的两边都有一平坦的刹车蹄,当刹车总泵来的油压压送到分缸,使刹车蹄向刹车碟夹住,以达到刹紧的效果,目前已普遍用于前轮,有的高级车装置四轮碟式刹车,其优点是作用灵敏,散热良好,不必调整刹车间隙,保养容易。 刹车油(Brake Fluid) 液压刹车系统所使用的液体称为刹车油,它必须不起化学作用,不受高温的影响,对金属及橡胶不会产生腐蚀、软化、膨胀之影响,目前所采用的有DOT3、DOT4、DOT5。 4、钢圈与车胎(Wheel rim, Tire) 轮胎面(Tire Tread) 指轮胎面接触在地面的部份,为防止打滑及散热起见,在轮胎面设置有许多花纹。 无内胎轮胎(Tubeless Tires) 轮胎内未配装内胎而此轮胎本身就有内胎构造,空气即充填在胎中,目前已普遍采用,取代有内胎的车轮。 内胎(Tire Tube) 以良质的橡胶制成,充填空气支持车重,配装在外胎内部,目前小轿车较少采用,而大客货车仍普遍用之。 轮胎尺寸(Tire Size) 轮胎尺寸印在胎壁上,表示方法有二种,即如34*7或7.50-20等表示之。前者为高压轮胎,后者为低压轮胎。另外也有许多记号,例如D用于轻型汽车,F用于中型汽车,G指标准型汽车,H、L、J是用于大型豪华及高性能汽车。如胎壁上加印个R,如175R13,表示轮胎是径轮胎,宽长175mm(6.9英吋),装在轮圈直径13英吋(330mm)在车轮上,一般也会刻上RADIAL字。 钢圈(Wheel Rim) 大多数车辆所使用的钢圈为钢材压制及焊接而成,目前的钢圈为钢材压制及焊接而成,目前的钢圈外环制造的很精确,以装配无内胎的轮胎。 铝合金钢圈(Alumminum-Rim) 质轻,加工容易,是一体铸成,不易变形,外观多变化,目前多采用,有省油,导热性良好,强度分布均匀,减少滚动噪音的优点。 轮胎平衡(Wheel Balance) 是前轮定位中,对轮胎的检查项目之一,轮胎若不平衡,会造成车辆行驶时,左右偏摆震荡上下跳动,方向盘摆震的现象,驾驶乘座极不舒适,必须配挂重铅块于钢圈的两侧,使之平衡。 车轮定位(Wheel Alignment) 汽车的前轮,为顾及操作容易及行驶上的安全,减少轮胎的磨损,于设计时则订定各项角度,即前束、内倾角、外倾角、后倾角,转向前展等五个项目,近年来车辆多采用四轮独立悬吊,而后轮亦做有前束及外倾角,以增加行驶的稳定及舒适性,故有后轮定位。 偏滑测试(Side Slip Tester) 以车子行驶1公里,车子偏向横侧之公尺数表非,即m/km,一般不得超过3-5m/km。车辆产生侧滑之原因为前束、外倾角,后倾角等调整不良之结果,所以监理站做车辆安全检查时,只需量偏滑值即可。 5、汽车电系(Automotive Electric System) 起动马达(Starting Motor) 利用齿轮传动来摇动引擎或起动引擎的电动马达。 电磁开关(Solenoid Switch) 借着电磁线圈蕊的移动而使开关合的一种小开关装置。其蕊也会导致机械作用,如将传动小齿轮与飞轮的齿轮啮合,以激活引擎。 卤素头灯(Halogen Headlamp) 一种灯泡内充满卤素的聚光大灯,其光度较一般头灯为亮。 汽油表(Fuel Level Indicator) 分为装在驾驶室仪表板的表体及装在油箱上的量油器两部份。 机油压力表(Oil Pressure Gauge) 通称为机油表,指示引擎内部机油压力的大小。至于油底壳中的机油量,需要引擎旁的机油尺测量。现今多数汽车以警告灯代替机油压力表。 压缩机(Compressor) 空调系统的机件,可探冷却剂蒸气压缩以增加其压力及温度。 冷凝器(Condenser) 空调系统的机件,能将管子中的热量,以很快的方式,传到管子附近的空气,大部分的汽车置于水箱前方。 储液器和干燥器(Dehydrator) 安装在冷凝器和挥发器之间,靠近冷凝器,用来储存液体冷媒,并且将冷媒里的水份吸掉。 冷媒(Refrigerant) 在空调系统中,透过蒸发与凝结,使热转移的一种物质。俗称氟里翁(Freon)。 冷冻油(Refrigerant Oil) 润滑空调系统里的活动机件,实施空调工作时,必须重新充填。 交流发电机(Alternator) 在汽车电系中,一种可将机械能改变成为电能的装置。由此可充电至电瓶,并可供应各电器的电力。 调整器(Regulator) 在充电系统中,能控制交流发电机电压的轮出,以防电压过高的装置。 电瓶水(Battery Acid) 电瓶内所用的电解液:是硫酸和水的混合物。 电瓶电压(Battery Voltage) 由电瓶极板数量决定,每一片极板为2.1伏特,一般12伏特电瓶则有六片极板。 发火线圈(Coil) 在汽车点火系统中,它可将电瓶的电压(12v)转变成为火星塞点火燃烧时所需的高电压。 分电盘(Distributor) 点火系统高低压电的转接站,可将通往发火线圈的电路接通或切断,而后将产生的高电压配送到各缸火星塞。 点火开关(Ignition Switch) 点火系统的开关(通常要使用钥匙),可自由开启或关闭点火线圈的主要电路,也适用于其它电系电路。 火星塞(Spark Plug) 为两电极及一绝缘体组合而成,可提供引擎汽缸火花点火间隙的一种零件。 分火头(Rotor) 分电盘里的零件,跟着分电盘轴一起轴动,利用一金属薄片,将高压电送至火星塞。 6、转向系统(Steering System) 转向拉杆(Steering Linkages) 此装置是被用来连接前轮转向节和转向齿轮,使方向盘转动时,可使前轮由一边摆向另一边。 轮向齿轮(Steering Gear) 固定在转向机轴下端的齿轮和装配在转向臂的齿轮总称。可将方向盘的旋转动作,转换成拉杆的直线运动。有二种基本的转向齿轮:回旋滚珠式和齿棒小齿轮式。 回旋滚珠式齿轮(Recirclulating-Ball Steering Gear) 此种转向齿轮,利用内部的循环珠,使螺母和螺杆之间的接触摩擦大大减少,让驾驶者操作方向盘轻巧方便。 动力转向(Power Steering) 汽车所使用的动力转向系统,基本上是经修改的手动转向系统,主要的是增加一个助力器(Power Booster),以帮助驾驶者。 7、悬吊系统(Suspension System) 钢板弹簧(Leaf Spring) 扁平长方形的钢板呈弯曲形,以数片叠成的底盘用弹簧,一端以梢子安装在吊架上,另一端使用吊耳连接到大梁上,使弹簧能伸缩。目前适用于中大型的货卡车上。 圈状弹簧(Coil Spring) 圈状弹簧为独立式悬吊装置使用最多之弹簧,以弹簧钢卷成螺旋状。 扭杆弹簧(Torsion-Bar Spring) 扭杆一端固定在车架上,另一端使用臂与车轮连接,车轮上下跳动时使扭杆扭转,以扭转弹力来吸收震动,构造简单占位置小,适合小型车使用,但材质要佳。 平稳杆(Stabilizer Bar) 平稳杆属横向装置于车架与控制臂之间,其功用可减少悬吊系统的移动及车身摇摆,尤其汽车转弯时,因离心力作用,会使车身发生倾斜,此杆抗衡扭力的作用足以减轻汽车偏外的程度。 避震器(Shock Absorber) 避震器的需求是由于弹簧不能马上稳定下来,也就是说弹簧被压缩再放开以后,它会持续一段时间又伸又缩,所以避震器可以吸收车轮遇到凹凸路面所引起的震动,使乘坐舒适。 前悬吊(Front Suspension) 前悬吊系统使前轮可以上下移动并吸收路面震动,但是也须使车轮能左右摆动,以便汽车转向。除大货卡车外,大多的车辆已普遍采用独立式悬吊装置,左右轮互相无关系,为独立动作。 后悬吊(Rear Suspension) 一般车辆后悬吊系统会采用钢板弹簧,或螺旋弹簧,但现今的轿车为使乘坐舒适,亦采用独立悬吊系,与前悬吊系相同,可以使四个轮子各自独立,为减少轮胎磨损及行驶稳定,需作后轮定位。 自动水平控制装置(Automatic Level Control) 自动水平控制系统为专门应付汽车后部荷重的改变,没有自动水平控制的汽车若在后部加重,汽车后部就会下沉,则会改变汽车的操纵特性,使头灯上扬。 8、车体(Body) 全长(Overall Length) 自前保险杆至车尾最末端之长度。 全宽(Overall Width) 车身左右最大之宽度。 全高(Overall Height) 自地面至车身最高点之高度。 轮距(Track) 前轮胎左右中心线之距离。 轴距(Wheel Base) 前轴中心点与后轴中心点间之距离。 感应烘烤(Induction Baking) 利用静电和电磁感应所发热量来烘烤涂装面的意思。 9、其它(Other) 三元触媒转换器(Three-Way Catalytic Converter) 使用铑和其它催化转换器,用来限制废气中 HC、Co和NOx等污染物的含量。 排气系统(Exhaust System) 指收集并且排放废气的系统,包括排气歧管、排气管、灭音管、尾管以及共振器。 共振器(Resonator) 一种类似灭音管,可减少排气噪音的装置。 蒸气液体分离器(Vapor-Liquid Separator) 蒸发气排散控制系统内的装置,可防止液体燃油经由活性碳滤罐蒸气管流入引擎。 电子燃料喷射(Electronic Fuel-Injection System) 能将燃料喷入引擎,并能定时、测油的一种系统。 氧气感知器(Oxygen Sensor) 排气管的装置之一,可测量废气中的含氧量,并将此讯号透过电压讯号送至ECU,作为调整混合比之参考。 感知器(Sensor) 任何可接收及反应讯号的装置,如电压的改变、温度及压力的变化,电子燃料喷射系统中,各厂牌均使用了6至10个以上的感知器。 电动汽油泵(Electric Fuel Pump) 供应超额油量至分油盘以维持喷射系统的工作压力:一般装在油箱附近 NOS全称NITROUS OXIDE SYSTEM,即氮气加速系统。是由美国HOLLEY公司开发生产的产品。在目前的世界直线加速赛(DRAG RACING)中,为了在瞬间提高大比率马力,利用的液态氮氧化物系统正是NOS。其实,早在二次世界大战中德国空军已开始使用NOS,战争结束后才逐渐被用于直线加速赛。NOS的工作原理是把二氧化氮(N2O),即俗称的笑气(LAUGH GAS)高压形成液态后装入钢瓶中,然后在引擎内与空气一道充当助燃剂与燃料混合燃烧(其可放出氧气和氮气,其中氧气就是关键的助燃气体,而氮气又可协助降温),以此增加燃料燃烧的完整度,提升马力。由于NOS提供了额外的助燃能力(氧气量大)所以安装NOS后还要对应增加燃油喷量与之配合,"要想马儿跑,就要马儿多吃草。"燃料就是引擎的草,引擎的动力也因此得到进一步的提升。NOS与涡轮增压、机械增压一样,都是为了增加引擎混合气中的氧气含量而提升燃烧效率增加马力,不同的是NOS是直接利用氧化物,而后两者则是通过外力增加空气密度来达到目的。也许有人会问为什么不直接使用氧气而用一氧化二氮呢?那是因为用氧气难以控制引擎的稳定性(高温和爆炸力),所以极少直接使用氧气。 改装店建议NOS系统每次使用时间不可超过1分钟,但其实按照系统开关要尽油门才开启来看,一般也就几秒的使用时间就可令转速超6000而令电脑自动断油。
2023-07-14 11:21:243

求一篇电动滚筒的英文文章

Driver installation is the heart of belt conveyor, the performance of a direct impact on the work of the belt conveyor reliability and overall performance. In order to provide an ideal drive belt conveyor installations, it has developed a variety of new device drivers, live tooth deceleration oil is the cold-electric drum-driven devices Poly advantage of the past developed a new type of device driver . Because electric drum with compact structure, drive high efficiency, low noise, long life and smooth operation, reliable work, sealing, and occupy less space location convenient maintenance and installation advantages, and suitable for all kinds of bad working environment, including moist, mud, dust and more work environment, we now have electric drum at home and abroad wider use of mining, metallurgy, coal, transportation, energy, food, tobacco, chemicals, building materials, printing and other production and construction areas. Against the existing gear oil-cool electric roller bearing capacity of the existence of poor transmission inefficient, complex structures, poor technology and will live tooth fluctuations electric drive technology transplanted to drum in order to give full play to their meshing teeth, bearing large capacity; radial movement of living tooth can do to avoid tooth interference; transmission ratio, compact structure, high transmission efficiency; processing simple, and good technology, the advantages of lower cost, the formation of a new alternative products -- "Living tooth deceleration oil-cool" electric drum. Live transmission gear is used to fluctuations transfer between two coaxial rotary movement form of a new type of transmission, the transmission and electric drum manner fully consistent. It consists of shock-V, the center round K, H and live tooth-tooth formed a group live, work, the shock wave of cyclical impetus to live teeth, tooth-tooth profile with the center point of meshing formed a snake belly wiggle-tangential wave, thus forming with the Center for the driving wheel relations. Live transmission gear with compact structure, small size, transmission ratio, the basic component of the advantages of good. Gear reducer live coaxial input and output will be left flange axle, motor, reducer, and the right axis coaxial with flange, thus solving ordinary electric drum gear eccentric existence of the problem. 驱动装置是带式输送机的心脏,其性能直接影响到带式输送机工作的可靠性与整体性能。为了给带式输送机提供理想的驱动装置,人们已研制出各种新型驱动装置,活齿减速油冷式电动滚筒正是聚以往驱动装置之优点而开发的一种新型驱动装置。由于电动滚筒具有结构紧凑、传动效率高、噪声低、使用寿命长、运转平稳、工作可靠、密封性好、占据空间位置少以及安装维修方便等优点,并且适合在各种恶劣环境下工作,包括潮湿、泥泞、粉尘多的工作环境,所以目前国内外已将电动滚筒广泛应用采矿、冶金、煤炭、交通、能源、粮食、烟草、化工、建材、印刷等各个生产建设领域。针对现有齿轮减速油冷式电动滚筒所存在的承载能力差、传动效率低、结构复杂、工艺性差等问题,将活齿波动传动技术移植到电动滚筒内,以充分发挥其啮合齿数多,承载能力大;活齿可做径向运动,避免轮齿干涉;传动比大、结构紧凑、传动效率高;加工简单,工艺性好,成本较低等优点,形成一种全新的替代产品——“活齿减速油冷式”电动滚筒。活齿波动传动是用来传递两同轴间回转运动的一种新型传动形式,这与电动滚筒的传动方式完全吻合。它由激波器V、中心轮K、活齿架H及一组活齿组成,工作时,激波器周期性地推动活齿,这些活齿与中心轮齿廓的啮合点形成了蛇腹蠕动式的切向波,从而与中心轮形成连续的驱动关系。活齿传动具有结构紧凑、体积小、传动比大、基本构件的工艺性好等优点。活齿减速机输入输出同轴,将左法兰轴、电动机、减速机、右法兰轴同轴配合,从而解决了普通齿轮电动滚筒存在的偏心问题。
2023-07-14 11:21:321

各路高手,哪个能提供液压专业英语词汇,包括缸,阀,泵,马达,密封件,连接件等

你得说的详细点呀 针对你说的这些 我写几个吧缸体:cylinder block, barrel阀:valve泵:pump 液压泵:hydraulic pump液压泵配件:hydraulic pump parts, spare parts of hydraulic pump马达:motor组合密封:seal kit连接块:landing配油盘:valve plate柱塞滑靴:piston shoe如果你是需要配件的话,太多了,压根说不完。纯手打,望采纳。 ^_^
2023-07-14 11:21:434

太喜欢悍马啦,能否介绍下

悍马是世界上最名副其实的4驱越野车,多年来一直独踞群雄之首。通用公司最新推出的H2概念车是这个独特车种的进化版。该车在2000年北美国际车展上首次亮相,预示着未来悍马的造型。H2尊崇现款悍马德里量和霸气,发扬其优良传统,把它现代化的同时保留并改进了这个生猛而强壮的美国偶像,以次扩大悍马的用户群。H2的目的不是再造悍马,而是展示这个品牌的发展方向,号召更多的人来体验悍马,尤其是那些具有冒险精神的人。 H2就像一台高性能电脑,用简单流畅的形式发挥精确而复杂的功能,而且每个部件都身兼多职,可以说是用艺术包装起来的使用工具。该车的造型来自现款悍马,但暴露在外的铆钉和紧固其减少了,车身表面很简洁。倾斜的风挡提高了空气动力性,但看上去仍相对直立,给人粗犷的感觉。 整体包裹式设计摒弃了中央金属分隔条,开阔了视野。侧面轮廓保留了悍马野兽般强壮的形象,短的前后外悬赋予了H2优越的爬坡能力。凸出的车门使上下车很容易。车尾延续了悍马典型的4窗设计,下拉式抬升门和上拉式后窗为装货提供了便利。隔板可以把后部载货空间分割成不同的格局,非常方便实用。H2的外形简洁,圆滑,颇具进攻性,不论从哪个角度看都是不折不扣的悍马,尤其是前脸。车头包括一个整体式绞盘,大防撞杆与机器盖连动,这样发动机更容易接近。车头,尾有多个挂钩。便于拖,拉货物,还有高强度大灯,雾灯和前杠上的辅助行驶灯。
2023-07-14 11:21:558

bi-rotational gear pump 与 bi-rotational hydraulic motor 是 齿轮泵与液压马达 吗?他们有什么不同?

.
2023-07-14 11:22:244

拉杆节数多会怎么样?影响使用性能吗?

拉杆节数越多,拉杆的长度越长,但是承载的重量就会越低,四节拉杆会比三节拉杆的稳定性和载重量低,为了易于子管和母管的连接顺畅伸缩,四节拉杆的管材厚度会薄一些,想了解详细,可以去询问一下东莞天誉,他们是做专门拉杆的,可能会帮到你。
2023-07-14 11:22:332

请教大侠(二把刀英语水平者请绕行,谢谢!),这段话用英语怎么说?希望比较纯正的英美正式用语。--2

为什么不找翻译器?
2023-07-14 11:22:428

英语翻译,很专业的塑料机械术语,会的帮忙翻译一下,小妹很急。非常感谢

1.3 AC motor 15kw 1/set 交流电机 15KW 1/台1.4 Speed regulator (JAPAN FUJI) 15kw 1/set 调速器 15KW 1/台1.5 Detailed requirement: 详细要求--thermal treatment and quench for gear surface 齿轮表面热处理和淬火Feeding base 进料底部6) Auto feeder 自动进料器--mode vacuum suction model 模式 真空吸入型 7) Dry with hopper type 干燥 漏斗型--mode auto control temp.hot wind for heating 模式 自动控制加热风温度--mode AC motor 模式 交流电机2、Composite die head with changeable core and mouth mould ф11~ф32mm one unit moule 复合模头与可调核心和口模 ф11 u301c ф32毫米一个单位模 --mode spiral type,with changeable mouth moule and core moule 模式 螺旋形 可调口模和核心模--heating control zone stainless steel heating ring 加热控制区不锈钢加热环--power 电源Each set for changeable calibrator、mouth moule and core rod可调测量器,口模和核心杆都有一个
2023-07-14 11:23:062

纺织机械专业英语翻译 高手帮忙 急!

编织用机器制造完全在所有方面包括马达、长的轴、表、由于起飞的等等尼龙齿轮(不是金属齿轮)减少声音
2023-07-14 11:23:253

手机上的游戏是怎么制作出来的

你想做什么类型的手游呢? 我们上千款游戏可以让你选择,基本上你想了到的 都可以做出来
2023-07-14 11:23:3610

induction motor是什么意思

induction motor 英[u026anu02c8du028cku0283u0259n u02c8mu0259utu0259] 美[u026anu02c8du028cku0283u0259n u02c8motu025a] 感应电动机 [例句]By contrast , the tesla roadster uses just one gear-such is the flexibility of its three-phase induction motor.相形之下,泰斯拉跑车仅仅使用单个齿轮这要归功于它的三相感应发动机。满意请采纳!!!
2023-07-14 11:24:432

three-phase induction motor是什么意思

三相异步电动机双语对照词典结果:three-phase induction motor三相感应电动机; 例句:1.By contrast, the tesla roadster uses just one gear-such is the flexibility of itsthree-phase induction motor. 相形之下,泰斯拉跑车仅仅使用单个齿轮这要归功于它的三相感应发动机。三相异步电动机双语对照词典结果:three-phase induction motor三相感应电动机; 例句:1.By contrast, the tesla roadster uses just one gear-such is the flexibility of itsthree-phase induction motor. 相形之下,泰斯拉跑车仅仅使用单个齿轮这要归功于它的三相感应发动机。
2023-07-14 11:24:511

千层面用英语怎么说

  千层面,用食材番茄酱、牛肉酱、白汁、芝士、面、牛奶、淡奶油、面粉等烤制出来的一种面饼。那么你知道千层面用英语怎么说吗?下面来学习一下吧。   千层面的英语说法:   Lasagna   千层面的相关 短语 :   肉酱千层面 lasagna with meat sauce   紫苏肉酱千层面 Basil meat sauce Lasagne   千层面包 Crisp Skin Bread   鸡肉千层面 Chicken lasagna   牛肉千层面 BeefLasagna   牛肉千层面 Beef Lasagne   意大利千层面 Italian Lasagne   千层面的英语例句:   1. The company was established in 2005 to auto parts, supplies export - oriented.   本公司成立于2005年,以汽车配件 、 用品出口为主.   2. Able to independently identify the function and quality of auto parts.   能够独立识别,判断汽车配件的功能属性及质量.   3. The factory supplied us with some parts of the car.   那家工厂给我们提供了一些汽车配件.   4. My company specializes in motorcycle accessories, auto parts, general machinery exports.   我公司专业从事摩托车配件, 汽车配件, 通用机械的出口.   5. Scope: Motor vehicles and parts sales . Motor vehicles and parts sales.   经营范围: 汽车及汽车配件的销售.   6. Auto parts mainly gear, belt and the car dashboard, and other accessories.   汽车配件主要是齿轮, 同步带以及汽车仪表等配件.   7. Scope: China - made cars and auto parts sales andparts sales.   经营范围: 国产汽车、汽车配件的销售.   8. Car Accessories, Tent , Beach Item, Bag, Seat Cover, Hamper, Mat Automobile Accessories.   采购产品汽车配件, 窗帘篷, 沙滩项目, 袋, 座椅的范围, 阻碍, 垫汽车配件.   9. Main business of auto parts, machinery and other accessories.   主要经营个汽车配件, 机械配件等.   10. Campbell, meanwhile, returned to his family and auto parts business.   其间, 坎贝尔回到了家人身边并重操旧业干起了汽车配件的工作.   11. There is a lucrative black market in spare parts for car.   有一个能赚钱的汽车配件黑市.   12. China"s automobile spare parts industry a very good prospect in the future . "   中国汽车配件行业,是一个极具 发展前途 的产业.   13. General cargo, sales auto parts, motorcycle accessories.   普通货运, 销售汽车配件, 摩托车配件.   14. Marine applications, cooking utensils, car fittings, furniture.   海事用品 、 煮食器具 、 汽车配件 、 家俱.   15. Marine application, cooking utensils, car fittings, door furniture.   海事用品 、 煮食器具 、 汽车配件 、 家具.
2023-07-14 11:25:101

gear motor 是直流电机还是步进电机

是步进电机。。 减速电机(Gear Motor)定义及用途减速电机是指减速机和电机(马达)的集成体。这种集成体通常也可称为齿轮马达或齿轮电机。通常由专业的减速机生产厂进行集成组装好后成套供货。减速电机广泛应用于钢铁行业、机械行业等。使用减速电机的优点是简化设计、节省空间。减速电机概述1、减速电机结合国际技术要求制造,具有很高的科技含量。2、节省空间,可靠耐用,承受过载能力高,功率可达95KW以上。3、能耗低,性能优越,减速机效率高达95%以上。4、振动小,噪音低,节能高,选用优质段钢材料,钢性铸铁箱体,齿轮表面经过高频热处理。5、经过精密加工,确保定位精度,这一切构成了齿轮传动总成的齿轮减速电机配置了各类电机,形成了机电一体化,完全保证了产品使用质量特征。6、产品才用了系列化、模块化的设计思想,有广泛的适应性,本系列产品有极其多的电机组合、安装位置和结构方案,可按实际需要选择任意转速和各种结构形式。减速电机分类1、大功率齿轮减速电机2、同轴式斜齿轮减速电机3、平行轴斜齿轮减速电机4、螺旋锥齿轮减速电机5、YCJ系列齿轮减速电机减速电机(Gear Motor)广泛应用于冶金、矿山、起重、运输、水泥、建筑、化工、纺织、印染、制药等各种通用机械设备的减速传动机构。
2023-07-14 11:25:451

电机和减速机什么关系

一般的电机是通过联轴器与减速机相连的,但也存在套装结构的,就是将电机轴直接穿入减速机的轴孔内
2023-07-14 11:25:567

One Piece At A Time 歌词

歌曲名:One Piece At A Time歌手:Johnny Cash专辑:Johnny Cash - 16 Biggest HitsArtist: Cash JohnnySong: One Piece At A TimeAlbum: The Essential Johnny CashWell, I left Kentucky back in "49An" went to Detroit workin" on a "sembly lineThe first year they had me puttin" wheels on cadillacsEvery day I"d watch them beauties roll byAnd sometimes I"d hang my head and cry"Cause I always wanted me one that was long and black.One day I devised myself a planThat should be the envy of most any manI"d sneak it out of there in a lunchbox in my handNow gettin" caught meant gettin" firedBut I figured I"d have it all by the time I retiredI"d have me a car worth at least a hundred grand.CHORUSI"d get it one piece at a timeAnd it wouldn"t cost me a dimeYou"ll know it"s me when I come through your townI"m gonna ride around in styleI"m gonna drive everybody wild"Cause I"ll have the only one there is a round.So the very next day when I punched inWith my big lunchbox and with help from my friendsI left that day with a lunch box full of gearsNow, I never considered myself a thiefGM wouldn"t miss just one little pieceEspecially if I strung it out over several years.The first day I got me a fuel pumpAnd the next day I got me an engine and a trunkThen I got me a transmission and all of the chromeThe little things I could get in my big lunchboxLike nuts, an" bolts, and all four shocksBut the big stuff we snuck out in my buddy"s mobile home.Now, up to now my plan went all right"Til we tried to put it all together one nightAnd that"s when we noticed that something was definitely wrong.The transmission was a "53And the motor turned out to be a "73And when we tried to put in the bolts all the holes were gone.So we drilled it out so that it would fitAnd with a little bit of help with an A-daptor kitWe had that engine runnin" just like a songNow the headlight" was another sightWe had two on the left and one on the rightBut when we pulled out the switch all three of "em come on.The back end looked kinda funny tooBut we put it together and when we got thruWell, that"s when we noticed that we only had one tail-finAbout that time my wife walked outAnd I could see in her eyes that she had her doubtsBut she opened the door and said "Honey, take me for a spin."So we drove up town just to get the tagsAnd I headed her right on down main dragI could hear everybody laughin" for blocks aroundBut up there at the court house they didn"t laugh"Cause to type it up it took the whole staffAnd when they got through the title weighed sixty pounds.CHORUSI got it one piece at a timeAnd it didn"t cost me a dimeYou"ll know it"s me when I come through your townI"m gonna ride around in styleI"m gonna drive everybody wild"Cause I"ll have the only one there is around.(Spoken) Ugh! Yow, RED RYDERThis is the COTTON MOUTHIn the PSYCHO-BILLY CADILLAC Come onHuh, This is the COTTON MOUTHAnd negatory on the cost of this mow-chine there RED RYDERYou might say I went right up to the factoryAnd picked it up, it"s cheaper that wayUgh!, what model is it?http://music.baidu.com/song/31343150
2023-07-14 11:26:131

急需钳工相关的英语词汇~~~

金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 摩擦 friction 联结 link 传动 drive/transmission 轴 shaft 弹性 elasticity 频率特性 frequency characteristic 误差 error 响应 response 定位 allocation 机床夹具 jig 动力学 dynamic 运动学 kinematic 静力学 static 拉伸 pulling 压缩 hitting 剪切 shear 扭转 twist 弯曲应力 bending stress 强度 intensity 三相交流电 three-phase AC 磁路 magnetic circles 变压器 transformer 异步电动机 asynchronous motor 几何形状 geometrical 精度 precision 正弦形的 sinusoid 交流电路 AC circuit 机械加工余量 machining allowance 变形力 deforming force 变形 deformation 应力 stress 硬度 rigidity 热处理 heat treatment 退火 anneal 正火 normalizing 脱碳 decarburization 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源 DC electrical source 门电路 gate circuit 逻辑代数 logic algebra 外圆磨削 external grinding 内圆磨削 internal grinding 平面磨削 plane grinding 变速箱 gearbox 离合器 clutch 绞孔 fraising 绞刀 reamer 螺纹加工 thread processing 螺钉 screw 铣削 mill 铣刀 milling cutter 功率 power 工件 workpiece 齿轮加工 gear mechining 齿轮 gear 主运动 main movement 主运动方向 direction of main movement 进给方向 direction of feed 进给运动 feed movement 合成进给运动 resultant movement of feed 合成切削运动 resultant movement of cutting 合成切削运动方向 direction of resultant movement of cutting 切削深度 cutting depth 前刀面 rake face 刀尖 nose of tool 前角 rake angle 后角 clearance angle 龙门刨削 planing 主轴 spindle 主轴箱 headstock 卡盘 chuck 加工中心 machining center 车刀 lathe tool 车床 lathe 钻削 镗削 bore 车削 turning 磨床 grinder 基准 benchmark 钳工 locksmith 锻 forge 压模 stamping 焊 weld 拉床 broaching machine 拉孔 broaching 装配 assembling 铸造 found 流体动力学 fluid dynamics 流体力学 fluid mechanics 加工 machining 液压 hydraulic pressure 切线 tangent 机电一体化 mechanotronics mechanical-electrical integration 气压 air pressure pneumatic pressure 稳定性 stability 介质 medium 液压驱动泵 fluid clutch 液压泵 hydraulic pump 阀门 valve 失效 invalidation 强度 intensity 载荷 load 应力 stress 安全系数 safty factor 可靠性 reliability 螺纹 thread 螺旋 helix 键 spline 销 pin 滚动轴承 rolling bearing 滑动轴承 sliding bearing 弹簧 spring 制动器 arrester brake 十字结联轴节 crosshead 联轴器 coupling 链 chain 皮带 strap 精加工 finish machining 粗加工 rough machining 变速箱体 gearbox casing 腐蚀 rust 氧化 oxidation 磨损 wear 耐用度 durability 随机信号 random signal 离散信号 discrete signal 超声传感器 ultrasonic sensor 集成电路 integrate circuit 挡板 orifice plate 残余应力 residual stress 套筒 sleeve 扭力 torsion 冷加工 cold machining 电动机 electromotor 汽缸 cylinder 过盈配合 interference fit 热加工 hotwork 摄像头 CCD camera 倒角 rounding chamfer 优化设计 optimal design 工业造型设计 industrial moulding design 有限元 finite element 滚齿 hobbing 插齿 gear shaping 伺服电机 actuating motor 铣床 milling machine 钻床 drill machine 镗床 boring machine 步进电机 stepper motor 丝杠 screw rod 导轨 lead rail 组件 subassembly 可编程序逻辑控制器 Programmable Logic Controller PLC 电火花加工 electric spark machining 电火花线切割加工 electrical discharge wire - cutting 相图 phase diagram 热处理 heat treatment 固态相变 solid state phase changes 有色金属 nonferrous metal 陶瓷 ceramics
2023-07-14 11:26:221

用英语讲极限运动的好处

An extreme sport (also called action sport and adventure sport) is a popular term for certain activities perceived as having a high level of inherent danger, and that are counter-cultural. These activities often involve speed, height, a high level of physical exertion, and highly specialized gear or spectacular stunts.The definition of an extreme sport is not exact — for example, although studies show that (road) cycling ranks as the sport with the highest rate of injury, it is not considered an extreme sport because it is not counter-cultural. The term"s origin is also unclear, but it gained popularity in the 1990s when it was picked up by marketing companies to promote the X Games.History The origin of the divergence of the term "extreme sports" from "sports" may date to the 1950s in the appearance of a phrase usually, but wrongly, attributed to Ernest Hemingway[10]. The phrase is"There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games." The implication of the phrase was that the word "sport" defined an activity in which one might be killed. The other activities being termed "games". The phrase may have been invented by either writer Barnaby Conrad or automotive author Ken Purdy.In recent decades the term extreme sport was further promoted by X Games, a multi-sport event created and developed by ESPN. The first X Games (known as 1995 Extreme Games) were held in Newport, Providence, Mount Snow, and Vermont in the United States.A history of the sports was published in 2004. Amped: How Big Air, Big Dollars and a New Generation Took Sports to the Extreme. The book provided an overview of the history, culture, and business of the sports and included interviews with athletes, company owners, and marketers.
2023-07-14 11:26:301

three-phase induction motor是什么意思

三相感应电动机
2023-07-14 11:26:503

水泵里Protection是什么意思?

保护
2023-07-14 11:27:013

张策是哪里人?

天底下叫张策的多了去了,你说的是哪个?干啥的?古人还是今人?
2023-07-14 11:27:093

CATIA问题 急啊 在线等

你的图形看的不是很清楚,这种情况我也有遇到,旋转一下是不是就可以了!
2023-07-14 11:27:182

求翻译 英文翻译 smart cars

Intelligent vehicle is a collection of environmental perception, planning and decision-making, much as the function for auxiliary driving level the comprehensive system, it focuses on using a computer, modern sensing, information fusion, communication, artificial intelligence and automatic control technology, such as is typical of high-tech complexes. Because of this kind of car is equivalent to the "eyes with car", "brain" and "feet" television cameras, electronic computers and automatic controlling systems, equipment, and can automatically start, accelerate, stop, can automatically bypass ground obstacles. In a complicated cases, it"s "brain" can be changed randomly, automatic selection of the best solution, command car normal and smooth running. Smart cars "eyes" is the car with right, up to 50 centimeters apart in two TV cameras, video cameras has a luminous device, can also issued a beam, join in a certain distance, the object image only at this distance can be intake and overlap. "Eyes" can identify front 5 ~ 20 meters platform between fractal plane, the height is 10 centimeters of above of obstacles.. Smart cars "foot" is the control of the car brake, steering gear.
2023-07-14 11:27:462

广交会关于阀门的英语对话

你想要哪方面的阀门单词
2023-07-14 11:28:063

急求外文翻译一篇3000字左右(PLC)

Development of PLC-based Tension Control SystemREN Sheng-le*, LU Hua, WANG Yong-zhang, FU Hong-yaDepartment of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, ChinaReceived 22 May 2006; accepted 22 November 2006AbstractFiber winding tension is an important factor in the molding techniques of composite material which influences the quality of winding product directly, and the tension control is a key technique in fiber winding techniques. This paper introduces a closed-loop tension control system with the programmable logic controller (PLC) with function modules as its control kernel, the alternating current (AC) servo motor as execute element and the radius-following device to accomplish the real-time radius compensation. The mechanism of the tension control system is analyzed and the numerical model is set up. The compensation technique of the radius of the scroll is analyzed. Experimental results show that the system is well qualified with high control precision and high reaction speed.*The components of composite material fiber winding possess such advantages as low weight, high strength, and high corrosion resistance, and they are widely applied in aviation and aerospace industry. Many researches have shown that improper or unstable tension leads to a strength loss of 20%-30% of the fiber wound components. An ideal tension control system should provide stable and adjustable tension during the winding process [1-3].With the development of the winding machine, tension controllers have, so far, undergone three stages of development, i.e., mechanical tension controller, electrical tension controller and computerized tension controller[4-5]. With the development of electronic technology and the appearance of the microprocessor of higher cost performance, computerized tension controller came into use. Microprocessor becomes the kernel of the control system and thus cuts down the number of circuits of the electronic control system, which greatly simplifies the system, improves its reliability and makes possible the application of advanced control methods. Therefore, this type of controllers is widely used[6-7].The tension control techniques are becoming mature and the specifications are being improved in some developed countries. However, the fiber winding industry of China started up late and still drops behind compared with the western countries.Mechanical tensioners, with low precision and slow response, account for the main part of domestically- applied tensioners, and cannot meet the tension requirements. Therefore, this paper presents a PLC-based tension control system.1 Set-up of the System Scheme1.1 Construction of the systemA winding tension control system generally consists of three main parts, namely the unwinder, the processer and the winder, and it may also include the measuring and control parts, ancillary transport apparatus, and a load cell. The type of the winder and that of the unwinder may be one of the two drive types, surface drive or center drive. The surface drive means that a scroll or belt is set on the surface of the winding material and the drive force is generated through friction. The center drive is to set a drive mechanism on the center shaft of the scroll, where the linear speed and the tension force of the winding fiber vary with the radius of the scroll, leading to the so-called “scroll thick”[8]. The phenomenon of “scroll thick” makes the tension control very complex, but the center drive mode is widely applied due to its wide applicability.1.2 Design of tension control schemeThis system adopts a scheme with a center drive and outward-draw fiber configuration. Since the output torque of the AC digital servo motor is in direct proportion to the fiber tension force and the scroll radius, the output torque should decrease as the scroll radius decreases to acquire a constant fiber tension. The change of the scroll radius can be measured by a radius following device and the sampled radius change then passes through an analog digital converter and is sent to the PLC. By reading the desired value of the tension force, the radius and tension force are calculated with the preset calculating algorithm. The speed instruction and torque limit instruction are issued and digital- to-analog converted to output the analog voltage signal to control the servo driver. The servo driver controls the rotating speed and output torque to control the fiber tension. The servo motoru2019s speed and torque are measured by the pulse encoder and the Hall element and fed back to the PLC system to compose a closed loop system. The mechanism of the system is shown in Fig.1.The main components in the system include(1) A Panasonic programmable controller (FP0-C10RS), a 12-bit FP0-A80 and an FP0-A04Vancilliary conversion module.(2) A Panasonic AC digital servo driver and servo motor.(3) A radius-following device including a radiusfollowing arm and a rotary potentiometer.2 Mathematical ModeEffective control of the fiber tension is required in fiber winding. Due to the versatility of the core mold shape and winding shape, the linear speed of the fiber is difficult to be kept constant andthe variation principle is extremely complex. Therefore, the influence of the speed on the tension force should be taken into consideration in the mechanical analysis of the controlled object. The PLC with function modules as the control systemu2019s control kernel, and the needed tension can be enacted from man-machine interface through the serial communication between PLC and upper computer. The input of the radius value, the torque feedback and the velocity feedback, the running of the preset calculating algorithm and the output of the system are done by the PLC with function modules.When the unwinder is considered, the dynamic torque equilibrium equation can be expressed as followsM (t ) = J (t )u03c9U00100005 (t ) + JU00100005 (t )u03c9 (t ) +TR(t ) + Mf + M0 uff081uff09where T is the yarn tension, R(t) is the real-time scroll radius, M(t) is the resistant moment of the AC servo motor, Mf is the viscous frictional moment, u03c9(t) is the angular velocity of the scroll, J(t) is the rotating inertia of the scroll and the yarn roll, and M0 is the dry frictional moment. As shown in Eq.(1), the scroll radius, the resistant moment, the angular velocity of the unwinder and the rotating inertia of the scroll are all functions of time, and the system is thus a complex multivariable time-varying system.Proper simplification of the torque equilibrium equation is carried out with classical control theory based on the following rules:(1) The dry frictional moment and the viscous frictional moment are very little and may be ignored. (2) The influence of JU00100005 (t )u03c9 (t ) on the tension force may be ignored since the instantaneous inertia changes very slightly.(3) The scroll radius is real-time measured and fed back by the radius following device. Eq.(1) is then simplified asTR(t) = M(t) + J (t )u03c9U00100005 (t ) (2)Therefore, the variations of scroll diameter and scroll angular velocity are the main influencing factors of the yarn tension.3 Compensation of the Radius of the ScrollThe radius change of the scroll causes the change of the scroll moment, i.e., the change of the TR(t ) in Eq.(2). One end of the radius following arm touches the scroll, and the other end is connected to the rotary potentiometer via gear magnifying structure, thus transforming a change in the spindle radius to a change of voltage, as shown in Fig.2.
2023-07-14 11:28:131

有关日立电梯控制柜内一些元器件及其功能

1、2、6、7都是断路器,用于控制部分回路的通断。4、5是接触器,用于控制主回路。3看不清,不过看着像提前开门板,用于电梯提前开门功能。
2023-07-14 11:28:222

用英语讲一个极限冒险运动

An extreme sport (also called action sport and adventure sport) is a popular term for certain activities perceived as having a high level of inherent danger, and that are counter-cultural. These activities often involve speed, height, a high level of physical exertion, and highly specialized gear or spectacular stunts.The definition of an extreme sport is not exact — for example, although studies show that (road) cycling ranks as the sport with the highest rate of injury, it is not considered an extreme sport because it is not counter-cultural. The term"s origin is also unclear, but it gained popularity in the 1990s when it was picked up by marketing companies to promote the X Games.History The origin of the divergence of the term "extreme sports" from "sports" may date to the 1950s in the appearance of a phrase usually, but wrongly, attributed to Ernest Hemingway[10]. The phrase is"There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games." The implication of the phrase was that the word "sport" defined an activity in which one might be killed. The other activities being termed "games". The phrase may have been invented by either writer Barnaby Conrad or automotive author Ken Purdy.In recent decades the term extreme sport was further promoted by X Games, a multi-sport event created and developed by ESPN. The first X Games (known as 1995 Extreme Games) were held in Newport, Providence, Mount Snow, and Vermont in the United States.A history of the sports was published in 2004. Amped: How Big Air, Big Dollars and a New Generation Took Sports to the Extreme. The book provided an overview of the history, culture, and business of the sports and included interviews with athletes, company owners, and marketers.
2023-07-14 11:28:581

求助:摩擦和润滑方面的英语

A AAMA American Automobile Manufacturers Association 美国汽车制造商协会ACEA Association des Constructers Européens d"Automobiles 欧洲汽车制造商协会 ACS American Chemical Society 美国化学学会AFR Air/Fuel Ratio 空/燃比AFV Alternative Fuel Vehicle 代用燃料汽车AGMA American Gear Manufacturer"s Association 美国齿轮制造商协会 AHEM Association of Hydraulic Equipment Manufacturers 液压设备制造商协会ALTENER Alternative Energy Programmed of the European Commission 欧洲委员会代用能源计划 AMT Automated Manual Transmission 自动手动传动ANSI American National Standards Institute 美国国家标准学会APE Association of Petroleum Engineers (USA) 美国石油工程师协会API American Petroleum Institute 美国石油学会 ASME American Society of Mechanical Engineers 美国机械工程师学会ASTM American Society for Testing & Materials 美国试验及材料学会 ATC Technical Committee of Petroleum Additive Manufacturers in Europe欧洲石油添加剂制造商技术委员会 ATF Automatic Transmission Fluid 自动传动液ATIEL Association Technique de l"Industrie Européenne des Lubrifiants 欧洲润滑油工业技术协会 B BOI Base Oil Interchanger 基础油互换BRT Ball Rust Test 球锈蚀试验BSI British Standards Institution 英国标准协会BTU British Thermal Units 英热单位 C CP Centipoises 厘泊CAFE Corporate Average Fuel Economy 公司平均燃料经济性 CARB California Air Resources Board 加州空气资源局CCD Combustion Chamber Deposit 燃烧室沉积CCS Cold Cranking Simulator 冷启动模拟器CEC Commission of the European Communities 欧盟委员会 Co-coordinating European Council for the Development of Performance Tests for Transportation Fuels, Lubricants & Other Fluids 运输用燃料、润滑油及其他流体性能测试开发欧洲协调委员会 CEC-EFTC CEC Engine Fuels Technical Committee CEC发动机燃料技术委员会CEC-ELTC CEC Engine Lubricants Technical Committee CEC发动机润滑油技术委员会CEC-TLTC CEC Transmission Lubricants Technical Committee CEC传动润滑油技术委员会 CEFIC European Chemical Industry Council 欧洲化学工业委员会CEPMA Central Europe Pipeline Management Agency 欧洲管线管理中央署CFPP Cold Filter plugging Point 冷滤点 CIMAC International Council on Combustion Engines 内燃机国际委员会CMA Chemical Manufacturers Association (USA) 美国化学品制造商协会 CNG Compressed Natural Gas 压缩天然气 CO Carbon Monoxide 一氧化碳 CR Common Rail (Diesel Injection) 同轨(柴油喷射)CRTV Commercial Road Transport Vehicle 公路商用运输车辆cSt Centistokes 厘沱CVT Continuously Variable Transmission 连续可变传动 D DEO Diesel Engine Oil 柴油发动机油DEOP Diesel Engine Oil Advisory Panel (API/EMA) 柴油发动机顾问小组(API/EMA)DI Detergent Inhibitor 清净分散抗氧复合剂 DI Direct Injection 直喷 DOT Department of Transport 美国运输部 E ECE Economic Commission for Europe (United Nations) 联合国欧洲经济委员会 EEB European Environmental Bureau 欧洲环境署 EEC European Economic Community 欧洲经济共同体EELQMS European Engine Lubricants Quality Management System 欧洲发动机润滑油质量管理系统 EEV Enhanced Environmentally Friendly Vehicles and Engines 强化的欧洲环境友好车辆和发动机 EFI Electronic Fuel Injection 电子燃油喷射 EFTC Engine Fuels Technical Committee (of CEC) 发动机燃料技术委员会(属CEC) EGR Exhaust Gas recycling 废气循环EHD Elasto hydrodynamic Lubrication 流体弹性动力润滑ELTC Engine Lubricants Technical Committee (of CEC) 发动机润滑油技术委员会(属CEC)EMA Engine Manufacturers Association (USA) 美国发动机制造商协会ENGVA European Natural Gas Vehicle Association 欧洲天然气车辆协会 EOLCS Engine Oil Licensing and Certification System (of API) 发动机油润滑油登记及认证系统分类系统(属API) EP European Parliament 欧洲议会 EPA Environmental Protection Agency (USA) 美国环保局EPEFE European Programmed on Emissions, Fuels & Engine Technologies 欧洲排放、燃料及发动机技术计划 ERC European Registration Centre 欧洲登记中心 ESCS Engine Service Classification System (API) 发动机服务分类系统(API) EU European Union 欧盟EUI Electronic Unit Injector 电子单元喷射 F FEO Fuel Economy Oil 节能油 FTP Federal Test Procedure (USA) 联邦试验程序(美国)FWD Front Wheel Drive 前轮驱动 G GDI Gasoline (Engine) Direct Injection 汽油(发动机)直喷GEPE Groupe des Experts pour la Pollution et l"Energie (Group of Experts for Pollution & Energy) 污染及能源专家组 GF- ILSAC Specification ILSAC 规格 H HC Hydrocarbon 烃HD Heavy Duty (vehicle or lubricant) 重负荷(车辆或润滑油)HDDEO Heavy Duty Diesel Engine Oil 重负荷柴油机油 HSDI High Speed Direct Injection (diesel engine) 高速直喷(柴油发动机)HT/HS High Temperature/High Shear (viscosity) 高温高剪切(粘度) HVI High Viscosity Index 高粘度指数 I IChemE Institute of Chemical Engineers (UK) 化学工程师学会(英国) ICOMIA International Council of Marine Industries Association 国际船舶工业协会理事会IDI Indirect Injection 间接喷射 IEA International Energy Agency 国际能源署IGL Investigation Group Lubricants (of CEC) 润滑剂调查小组(属CEC) ILMA Independent Lubricant Manufacturers Association (USA) 美国独立润滑剂制造商协会 ILSAC International Lubricant Standardization and Approval Committee 国际润滑剂标准化和批准委员会IP Institute of Petroleum (UK) 英国石油学会 ISO International Standards Organization 国际标准化组织 J JALOS Japanese Lubricating Oil Society 日本润滑油协会JAMA Japan Automobile Manufacturers Association 日本汽车制造商协会 JARI Japan Automobile Research Institute 日本汽车研究学会JASO Japanese Automobile Standards Organization 日本汽车标准组织JAST Japan Society of Tribologists 日本摩擦学者协会 JIS Japanese Industrial Standards 日本工业标准JSAE Society of Automotive Engineers (Japan) 日本汽车工程师学会 K KV Kinematics" Viscosity 运动粘度 L LCV Light Commercial Vehicle 轻型商用车 LEV Low Emissions Vehicle 低排放车LOFI Lubricant Oil Flow Improver 润滑油流动改进剂 LPG Liquefied Petroleum Gas 液化石油气 LRG Lead Replacement Gasoline 铅替代汽油LSADO Low Sulphur Automotive Diesel Oil 低硫汽车柴油 M MIL Military Specification (USA) 美国军用规格MRV Mini Rotary Viscometer 微型旋转粘度计MTAC Multiple Test Acceptance Criteria 多次试验评分标准 MTF Manual Transmission Fluid 手动传动液MVEG Motor Vehicle Emissions Group (of the European Commission) 发动机车辆排放小组(属欧洲委员会) N NLGI National Lubricating Grease Institute (USA) 美国润滑脂学会 NMMA National Marine Manufacturers Association (USA) 美国船舶制造商协会 NOX Nitrous Oxides 氮氧化物NPRA National Petroleum Refiners Association (USA) 美国石油炼制商协会 O OBD On-board diagnostics 车上诊断 OCP Olefin Co-Polymer 烯烃共聚物 ODI Oil Drain Interval 换油期OEM Original Equipment Manufacturer 设备原制造商 OPEST Oil Protection and Emission System Test 油品保护及排放系统试验 P PAJ Petroleum Association of Japan 日本石油协会PC- API Categories for Diesel engines API 柴油发动机油分类 PCMO Passenger Car Motor Oil 轿车发动机油PCD Passenger Car Diesel 轿车柴油 PCV Passenger Car Vehicle 乘用车PFI Port Fuel Injection 喷嘴燃油喷射PIB Polyisobutene 聚异丁烯 PM Particulate Matter 颗粒物PM10 Particulate matter with particle size below 10 microns 小于10微米的颗粒物PPD Pour Point Depressant 降凝剂 PTF Power Transmission Fluid 动力传动液 S SAE Society of Automotive Engineers (USA) 美国汽车工程师学会 SHPD Super High Performance Diesel (oil) 超高性能柴油机油 SIP Styrene Isoprene Co-Polymers 苯乙烯-异戊二烯共聚物 SMM&T Society of Motor Manufacturers & Traders Ltd (UK) 英国发动机制造商和贸易商协会 SSI Shear Stability Index 剪切稳定性指数STLE Society of Tribologists and Lubrication Engineers 摩擦学者和润滑工程师学会 STUO Super Tractor Universal Oil 拖拉机超级通用油 T TAN Total Acid Number 总酸值 TBN Total Base Number 总碱值TISI Thai Industrial Standards Institute 泰国工业标准学会TLEV Transitional Low Emissions Vehicle 过渡性低排放车辆 U UEIL European Union of Independent Lubricant Manufacturers 欧洲独立润滑剂制造商联合会UHC Unborn Hydrocarbon 未燃烧烃 UHVI Ultra High Viscosity Index 超高粘度指数 UK-PIA United Kingdom Petroleum Industry Association 英国石油工业协会ULEV Ultra-Low Emissions Vehicle 超低排放汽车 V VDS, VDS2 Volvo Long Drain Lubricant Specification 沃尔沃长换油期润滑油规格VHVI Very High Viscosity Index 很高粘度指数 VII Viscosity Index Improver 粘度指数改进剂VM Viscosity Modifier 粘度改进剂 Z ZDDP Zinc Dialkyl Dithiophosphates 二烷基二硫代磷酸锌 ZEV Zero Emissions Vehicle 零排放车辆 润滑油行业词汇(JHIJ) G GDI Gasoline (Engine) Direct Injection 汽油(发动机)直喷GEPE Groupe des Experts pour la Pollution et l"Energie (Group of Experts for Pollution & Energy)污染及能源专家组GF- ILSAC Specification ILSAC 规格H HC Hydrocarbon 烃HD Heavy Duty (vehicle or lubricant) 重负荷(车辆或润滑油)HDDEO Heavy Duty Diesel Engine Oil 重负荷柴油机油HSDI High Speed Direct Injection (diesel engine) 高速直喷(柴油发动机)HT/HS High Temperature/High Shear (viscosity) 高温高剪切(粘度)HVI High Viscosity Index 高粘度指数I IChemE Institute of Chemical Engineers (UK) 化学工程师学会(英国)ICOMIA International Council of Marine Industries Association 国际船舶工业协会理事会IDI Indirect Injection 间接喷射IEA International Energy Agency 国际能源署IGL Investigation Group Lubricants (of CEC) 润滑剂调查小组(属CEC)ILMA Independent Lubricant Manufacturers Association (USA) 美国独立润滑剂制造商协会ILSAC International Lubricant Standardization and Approval Committee 国际润滑剂标准化和批准委员会IP Institute of Petroleum (UK) 英国石油学会ISO International Standards Organization 国际标准化组织J JALOS Japanese Lubricating Oil Society 日本润滑油协会JAMA Japan Automobile Manufacturers Association 日本汽车制造商协会JARI Japan Automobile Research Institute 日本汽车研究学会JASO Japanese Automobile Standards Organization 日本汽车标准组织JAST Japan Society of Tribologists 日本摩擦学者协会JIS Japanese Industrial Standards 日本工业标准JSAE Society of Automotive Engineers (Japan) 日本汽车工程师学会
2023-07-14 11:29:081

留学申请动机信模板英文

  申请出国留学,前期的申请工作中,需要准备充足的申请材料,其中动机信是申请的关键材料,为大家分享了留学动机信的英文模板,大家可以参考一下。    一、留学动机信范文   I am a junior student coming from Arts & Metiers ParisTech in France which is a mechanical engineering school and whose main task is cultivating general engineer. I have a good command of professional knowledge, and I am also capable in practice through study and experiment. However, I still long for a further study and improving professional skills, so I look forward to majoring in design of rotating machine at cranfield university in UK.   There are four reasons why I long for an further study in cranfield university. Firstly, I ache with desire to experience and have education of a comprehensive university which has professional studies in different majors rather than a general engineering school. Secondly, I need to improve my English urgently. It is of great help in job hunting mastering English, French and my mother tongue Chinese. Lastly, I realize that I have great interest in machinery, and generally speaking I have a good report at some courses in my first school year, such as stress analysis, bearing design and gear design, so the knowledge I have mastered laies a solid foundation for me to further study design of rotating machine.   I am confident I will have a good performance if your esteemed school would like to give me the entrance chance. On the one hand, my social experiences help me a lot. I have a good adaptive ability and I can merge into new environment quickly.   For example, I had no idea about French as a foreigner at the very beginning, and I had never been in touch with French when I graduated from senior high school. After that I started to study french, and I entered Arts & Metiers ParisTech after three years of study. My work experiences make me deal with interpersonal relationship very well. I worked in a Chinese restaurant in the past, and I alsoworked as a trainee at Photonics Bretagne.   On the other hand, I perform well at school. I have a good understanding in theory and I can understand the formula analysis thoroughly, moreover I like to share my opinions with members in group work, so I am competent for group work with students coming from different countries at Cranfield University. And I want to be a mechanical design engineer in motor corporation in the future, and majoring in design of rotating machine at cranfield university is of great help for the position.   In conclusion, I have strong desire to further study at your esteemed univeristy. I really hope I will have the opportunity to improve my professional skills as well as overall quality, and it is a great honour for me to study and practice at the honorable school.    二、留学动机信写作内容   1、简介:介绍自己的学术情况,本科专业背景及成果,如果工作了要写清工作情况,选择学校和专业的原因。   开头应该以Estimado seor / seora 开头,对录取官做基本问候。同时开展自我背景介绍。   2、选择该专业的原因:为什么会选择该校该专业,这是比较重要的一部分。如果你的动机信写的都不能打动自己,还怎么奢望打动录取官?   另外,写写在专业研究上有什么发现和成果;如果是跨专业申请,可以写对所跨专业感兴趣的原因,并表示自己已经在学习和收集相关领域的知识,表明自己有足够的学术能力来独立完成研究。   3、语言水平及工作经验:现在在西班牙读硕士,语言等级要求相对较高。如果同学已经拥有DELE等级证书或SIELE考试成绩,需要在动机信里向录取官呈现出来,这样能够保证录取官对你语言水平的认可程度。在西班牙留学,良好的西语水平是非常重要的!切记!   如果是已经工作的同学,可以着重写工作内容、经历等,表现优秀的话,会很加分。   4、未来发展:在西班牙读研能够为自己带来什么?这些也需要在动机信里展露出来,对未来的期许和毕业后的发展方向,让录取官知道你对自己有一个详细的规划,是认真对待来西班牙读研这件事的。   说了这么多,总的来说,动机信就是一封纸上的推荐自己、展示自己的渠道。   最后,要向录取官表示谢意,感谢他阅读你的动机信,并表示自己非常期待得到他的回复。    三、留学动机信写作误区   文体冗赘   由于留学动机信的篇幅本身就不是很大,通常为一到两页,因此我们需要重视自己写作和表达方式的简洁性,不让动机信过分烦琐与冗赘。   内容空洞   有一些申请者在motivation letter中描写自己的成就或能力的时候,仅使用空洞的词语,而没有提出任何实际例子。所以提供事实来支持自己的观点是第一要务,可是值得一提的是,并非只正式的研究活动或比赛才被认为项目, 课程上的比较大作业也可以作为研究项目,也可以在动机信上装点门面。   OTIVATION LETTER格式及语法问题   语法问题是一个我们常常提到的话题,而且这是国外学校的老师特别讲究的一点。在写作申请学校动机信时,学生一定要关注语法方面。进行认真的写作后,自己再审校几遍,如果觉得没必要,那也可以请你的同学或朋友帮你一个忙, 改正文书的语法错误。此外, motivation letter格式也是大家经常忽略的一个问题。即便学校没有对动机信格式的具体要求, 你也要遵循基本写作原则。
2023-07-14 11:29:151

F1在纽博格林北环的最快圈速

纽博格林北环赛道位于德国比利时边界的郊区,为世界上最大的赛车场。赛道横贯在山原丘陵之间,在原始的山林之间任赛车高速的穿梭,赛道随着山势而起伏,宛若云霄飞车一般的比赛过程,所以被人们称之为“绿色地狱”。 Nurburgring北环山道,20.6 km,左弯88个,右弯84个,落差300多米 6:11.13 - 202.073 km/h ?Porsche 956, Stefan Bellof, 1000km 1983, practice 7:01 --- Manthey Porsche GT3 race car, 493 hp (2004) ---176.152 km/h 7:06 -- BMW M3 GTR, 450 PS/1350 kg, Müller (2003) 7:20 -- Opel Astra DTM V8 Coupe, 500hp, set-up for 24hrs race (2003) 7:28 --- Porsche Carrera GT, Walter Rohrl, Autobild July 2004 (量产车最快记录) 7:39 Koenigsegg CCR, 806 PS/1180 kg 7:40 Corvette Z06 600 PS/ 1319 kg( 7/2005) 7:40 Porsche GT3 RS, stock but Pirelli P Zero Corsa, Mattias Ekblom (ams) 7:40 --- Mercedes Benz McLaren SLR, Klaus Ludwig, Autobild July 2004 7:43 --- Porsche 996 911 GT3 RS, factory test driver Walter Rohrl, MOTOR Magazine 7:43.5 - Lamborghini Murcielago (Autocar magazine, 2002) 7:44 --- Pagani Zonda C12S (07/2003) 7:45 -- McLaren F1 7:46 --- Porsche 996 GT2 7:49 --- Porsche 996 GT3 Cup 7:49.72 Honda RC30, Helmut Daehne 1993 (摩托车) 7:50 --- BMW E46 M3 CSL (08/2003) 7:52 --- BMW M5 (E60), 507 PS/1844 kg, 7:52 --- Lamborghini Gallardo E-Gear (12/2003) 7:54 --- Porsche 996 GT3 (06/2003) 7:56 --- Ferrari 360 Challenge Stradale (02/2004) 7:56 --- Porsche 996 Turbo 7:56 --- Chevrolet Corvette C6 (tested by Dave Hill) 7:59 --- Porsche 911 Carrera S (997) (Walter Rohrl 2004) 8:04 --- Lamborghini Diablo GT, 575 PS/1620 kg (07/2000) 8:05 --- Ferrari 575M Maranello F1,580 PS/1820 kg (12/2002) 8:06 --- Mercedes Benz SL55 AMG 8:06.1 - Subaru WRX STi Spec-C 黑泽元治 (2004) 8:07 --- Ferrari 550 Maranello (06/1998) 8:09 --- Ferrari 360 Modena (10/1999) 8:09 --- Lamborghini Diablo SV ,520 PS/1590 kg (12/1
2023-07-14 11:29:231

帮忙塔式起重机说明的翻译(中译英)在线等 高分~~~

这个太费劲了!太长 给的分也不不多
2023-07-14 11:29:325

玉米的结构 玉米的结构是什么

玉米的结构是:玉(独体结构)米(独体结构)。 玉米的结构是:玉(独体结构)米(独体结构)。 拼音是:yù mǐ。 词性是:名词。 注音是:ㄩ_ㄇ一ˇ。玉米的具体解释是什么呢,我们通过以下几个方面为您介绍:一、词语解释【点此查看计划详细内容】玉米yùmǐ。(1)玉蜀黍的俗名。二、引证解释⒈玉蜀黍的俗名。引孙锦标《通俗常言疏证·植物》:“《海门物志》米之有甲者,一名蜀黍。蜀粟音近,《本草》谓之玉蜀黍,今俗称玉米。”郭沫若《洪波曲》第十章五:“午后政工大队送来煮玉米,大喜过望,分享之。”三、国语词典玉蜀黍的别名。参见「玉蜀黍」条。词语翻译英语corn,maize,CL:德语Mais(S)_法语ma_s四、网络解释玉米(禾本科玉米属植物)玉米(拉丁学名:ZeamaysL.)是禾本科玉蜀黍属一年生草本植物。别名:玉蜀黍、棒子、包谷、包米、包粟、玉茭、苞米、珍珠米、苞芦、大芦粟,东北辽宁话称珍珠粒,潮州话称薏米仁,粤语称为粟米,闽南语称作番麦。玉米是一年生雌雄同株异花授粉植物,植株高大,茎强壮,是重要的粮食作物和饲料作物,也是全世界总产量最高的农作物,其种植面积和总产量仅次于水稻和小麦。玉米一直都被誉为长寿食品,含有丰富的蛋白质、脂肪、维生素、微量元素、纤维素等,具有开发高营养、高生物学功能食品的巨大潜力。但由于其遗传性较为复杂,变异种类丰富,在常规的育种过程中存在着周期过长、变异系数过大、影响子代生长发育的缺点,而现代生物育种技术不但克服了上述缺点和不足,同时也提高了育种速度和质量。玉米味道香甜,可做各式菜肴,如玉米烙、玉米汁等,它也是工业酒精和烧酒的主要原料。2018年8月,财政部、农业农村部、银保监会印发通知,将玉米作物制种纳入中央财政农业保险保险费补贴目录。关于玉米的近义词苞米关于玉米的诗词《红玉米》《感怀·桂薪玉米转煎熬》《玉米》关于玉米的诗句可爱的侧面像玉米和群星的珠串不在闪耀有些人疲倦了长与乔松燕玉米面房桂薪玉米转煎熬关于玉米的单词mayscornChinese cornsilkmealiemaizecorn oilcornflakes关于玉米的成语米盐博辩十米九糠水米无交斗米尺布八米卢郎凌杂米盐数米量柴吹糠见米粒米狼戾等米下锅关于玉米的词语灌米汤米盐博辩等米下锅十米九糠鱼米乡简丝数米凌杂米盐水米无交八米卢郎山川米聚关于玉米的造句1、面包牛奶包围下的我,仍然钟情妈妈熬的玉米粥。2、随着噼啪的爆裂声,金黄色的玉米粒变成了雪白的米花。3、由于施用了肥田粉,玉米产量大幅度提高。4、今年玉米的长势很好,风调雨顺的。5、这儿的玉米常年亩产千斤,遇到丰年还要增产。点此查看更多关于玉米的详细信息
2023-07-14 11:27:301

太平鸟童装和水孩儿哪个好

水孩儿好。1、水孩儿SOUHAIT“水孩儿”童装品牌1995年诞生,主要服务于2-12周岁少年儿童,开发以中式为特色,结合休闲、运动风格的各种系列服装产品。太平鸟童装的覆盖率没有水孩儿高,但是质量也是不相上下的。2、水孩儿是中高端档次的一个品牌,当初从北京百盛到燕莎起步,发展到如今已经有数百个店面,自从创立20多年以来已经赢得了广泛的市场口碑。太平鸟主打中产阶级和白领消费群体,童装较差。
2023-07-14 11:27:311

需要《鹅妈妈的童谣》全集!

  这个是英文的,下面有中文  TWEEDLE-DUM AND TWEEDLE-DEE  Tweedle-dum and Tweedle-dee  Resolved to have a battle,  For Tweedle-dum said Tweedle-dee  Had spoiled his nice new rattle.  Just then flew by a monstrous crow,  As big as a tar barrel,  Which frightened both the heroes so,  They quite forgot their quarrel.  THREE BLIND MICE  Three blind mice! See how they run!  They all ran after the farmer"s wife,  Who cut off their tails with a carving knife.  Did you ever see such a thing in your life  As three blind mice?  HUMPTY DUMPTY  Humpty Dumpty sat on a wall,  Humpty Dumpty had a great fall;  All the King"s horses, and all the King"s men  Cannot put Humpty Dumpty in his place again.  THE LION AND THE UNICORN  The Lion and the Unicorn were fighting for the crown,  The Lion beat the Unicorn all around the town.  Some gave them white bread, and some gave them brown,  Some gave them plum-cake, and sent them out of town.  SING A SONG OF SIXPENCE  Sing a song of sixpence,  A pocket full of rye;  Four-and-twenty blackbirds  Baked in a pie!  When the pie was opened  The birds began to sing;  Was not that a dainty dish  To set before the king?  The king was in his counting-house,  Counting out his money;  The queen was in the parlor,  Eating bread and honey.  The maid was in the garden,  Hanging out the clothes;  When down came a blackbird  And snapped off her nose.  THE DEATH AND BURIAL OF POOR COCK ROBIN  Who killed Cock Robin?  "I," said the sparrow,  "With my little bow and arrow,  I killed Cock Robin,"  Who saw him die?  "I," said the fly,  "With my little eye,  I saw him die."  Who caught his blood?  "I," said the fish,  "With my little dish,  I caught his blood."  Who"ll make his shroud?  "I," said the beetle,  "With my thread and needle.  I"ll make his shroud."  Who"ll carry the torch?  "I," said the linnet,  "I"ll come in a minute,  I"ll carry the torch."  Who"ll be the clerk?  "I," said the lark,  "If it"s not in the dark,  I"ll be the clerk."  Who"ll dig his grave?  "I," said the owl,  "With my spade and trowel  I"ll dig his grave."  Who"ll be the parson?  "I," said the rook,  "With my little book,  I"ll be the parson."  Who"ll be chief mourner?  "I," said the dove,  "I mourn for my love,  I"ll be chief mourner."  Who"ll sing a psalm?  "I," said the thrush,  "As I sit in a bush.  I"ll sing a psalm."  Who"ll carry the coffin?  "I," said the kite,  "If it"s not in the night,  I"ll carry the coffin."  Who"ll toll the bell?  "I," said the bull,  "Because I can pull,  I"ll toll the bell."  All the birds of the air  Fell sighing and sobbing,  When they heard the bell toll  For poor Cock Robin.  Humpty Dumpty  蛋在悬崖上孵着  孵着孵着,掉了下来  就算聚集了国王所有的马  就算聚集了国王所有的臣子  蛋也不能再恢复原来的样子  Who killed Cock Robin  谁杀了知更鸟?  是我,麻雀说,  用我的弓和箭,  我杀了知更鸟。  谁看见他死去?  是我,苍蝇说,  用我的小眼睛,  我看见他死去。  谁取走他的血?  是我,鱼说,  用我的小碟子,  我取走他的血。  谁为他做寿衣?  是我,甲虫说,  用我的针和线,  我会来做寿衣。  谁来挖坟墓?  是我,猫头鹰说,  用我的凿子铲子,  我会来挖坟墓。  谁来当牧师?  乌鸦说,是我,  用我的小本子,  我会来做牧师。  谁来当执事?  是我,云雀说,  只要不在夜晚,  我就会当执事。  谁来拿火炬?  红雀说,是我,  我立刻把它拿来。  我将会拿火炬。  谁来当主祭?  是我,鸽子说,  我要哀悼挚爱,  我将会当主祭。  谁来抬棺?  是我,鸢说,  如果不走夜路,  我就会来抬棺。  谁来扶棺?  是我们,鹪鹩说,  还有公鸡和母鸡,  我们会来扶棺。  谁来唱赞美诗?  画眉说,是我,  她站在灌木丛上,  我将唱赞美诗。  谁来敲丧钟?  是我,牛说,  因为我能拉牦。  所以,再会了,知更鸟。  空中所有的鸟,  全都叹息哭泣,  当他们听见丧钟,  为可怜的知更鸟响起。  启事  通告所有关系人,  这则启事通知,  下回鸟儿法庭,  将要审判麻雀。  When a good King Arthur rule this land  当亚瑟王治理这片土地的时候  他是一位伟大的王  他偷了三袋麦片  为了做一个大布丁  这个王做的布丁  放进许多葡萄干  还放进了一块大奶油  就像我的两个拇指那么大  国王和皇后吃了布丁  身边的贵族们也吃了  那天晚上他们什么也没吃  第二天早上皇后被油煎了  Sing a song of six pences  唱一首六便士的歌  黑麦装满一袋  24只黑鸫  在烤好的派中  当派打开的时候  鸟儿们开始唱歌  这是多么棒的  为国王所做的料理  国王待在他的金库里  数着他的财富  皇后在大厅里  吃着面包和蜂蜜  女仆在花园里  晾着刚洗的衣服  来了只小黑鸫  突然啄了下她的鼻子  Crooked man  有个性格扭曲的男人  走在一条长一里的扭曲的路上  手里那着扭曲的六便士  踏在扭曲的台阶上  他买了一只扭曲的猫  猫捉了一只扭曲的老鼠  他们一起住在扭曲的小房子里  Little Miss Muffet  小玛菲特小姐  坐在垫子上  吃着乳酪  然后来了一只蜘蛛  坐在她旁边  吓跑了玛菲特小姐  Georgie Porgie  治•珀治  布丁和派  亲吻女孩惹她们哭  男孩们来了  乔治•珀治就跑了  Baa, Baa, Black sheep  咩,咩,黑羊啊  你有羊毛吗?  是的,先生。是的,先生  三袋满满的  一袋给男主人  一袋给女主人  还有一袋给那个  住在街尾的小男孩  What are little boys made of ?  小男孩是由什么做的?  青蛙和蜗牛  还有小狗的尾巴  小女孩是由什么做的?  糖和香料  都是那么的美好呀  Lizzie Borden  里兹•波顿拿着斧头  砍了爸爸四十下  当她见了自己所做的  接着砍了妈妈四十一下  There was a man, a very untidy man  从前有个男子  一个非常肮脏的男子  找不到他的手指  要放近墓里的手指  头滚落在床下  四肢散落在房间里  2 回复:鹅妈妈的童谣  Solomon Grundy  所罗门•格兰德  在星期一出生  在星期二受洗  在星期三结婚  在星期四生病  在星期五病危  在星期六死亡  在星期天焚尸  这就是  所罗门•格兰德的最后  Ten little nigger boys went out to dine  十个小黑人出外用膳;  一个噎死,还剩九个。  九个小黑人熬夜到很晚;  一个睡过头,还剩八个。  八个小黑人在丹文游玩;  一个说要留在那儿,还剩七个。  七个小黑人在砍柴;  一个把自己砍成两半,还剩六个。  六个小黑人玩蜂窝;  一只黄蜂叮住一个,还剩五个。  五个小黑人进入法院;  一个被留下,还剩四个。  四个小黑人到海边去;  一条红鲱鱼吞下一个,还剩三个。  三个小黑人走进动物园里;  一只大熊抓走一个,还剩两个。  两个小黑人坐在太阳下;  一个热死,只剩一个。  一个小黑人终于活了下来;  最后结了婚,一个也没有了。  My mother has killed me  我的妈妈杀了我,  我的爸爸在吃我,  我的兄弟和姊妹坐在餐桌底,  捡起我的骨头,  埋了它们,  埋到冰冷的石碑下。  Three blind mice  三只瞎眼的老鼠!看它们跑的方式!  它们追着农夫的老婆,  她用餐刀切了它们的尾巴。  你这辈子见过像这样的东西吗?  三只瞎眼的老鼠。  Twelve mouths  一月雪  二月冰  三月风  四月雨  五月花蕾  六月玫瑰  七月游乐  八月温暖  九月开学  十月苹果  十一冷天  十二月圣诞节  Simple Simon  无知的西蒙遇见一个卖派的商人  正要赶往集市  无知的西蒙对卖派的商人说:  “让我尝尝你的派吧 ”  商人对无知的西蒙说:  “先让我看看你的便士吧”  无知的西蒙对商人说:  “其实我一分也没有”  他去抓小鸟  认为自己不会失败  因为他有一把盐  撒在它的尾巴上  他去取小鸟的窝  那个筑在一根大树枝上的鸟窝  树枝断了,无知的西蒙掉下来  落在脏脏的泥沼里  他去打野鸭  但是野鸭飞走了  西蒙说,我打不中它  因为他不呆在那里  无知的西蒙去钓鱼  想要钓一条鲸鱼  然而他所有的水  都在妈妈的水桶里  无知的西蒙去打猎  想要打中一只野兔  他骑着驴穿过街道  那里找不到一只野兔  他去吃蜂蜜  从一只餐桌上的芥末罐子  他咬着自己的舌头直到哭出来  这就是他吃到的全部  他去骑头花斑牛  可母牛还有头小牛  母牛甩他在地上  惹的人们笑哈哈  一次西蒙做了个大雪球  把它带回来烤一烤  把它放在火前面  雪球一会儿不见了  他到冰上去滑冰  在冰还能支撑前  然后他把膝盖插到冰里面  可怜的西蒙睁大了眼  他用黑色的鞋油来洗澡  因为他没有肥皂  然后他对妈妈说:  “我想现在自己很漂亮吧”  无知的西蒙去赏花  李子长在蓟上  手被刺伤了好几次  可怜的西蒙大叫着  他坐在笼子里到了水里  但是很快就沉了下去  可怜而又无知的西蒙啊  永远地再见了  There was an old man  从前有个老人  他养了一头小牛  现在说到一半  老人把小牛带出牛舍  再把它系在墙上  这就是全部  There was a lady all skin and bone  从前有个皮包骨头的女人,  当然你从没听说过这样的女人:  一切发生在某一天,  这位女士去教堂作祷告。  当她来到教堂阶梯,  她停下来作了个小小的休息;  当她来到教堂墓园,  她听见地狱的呻吟声是如此响亮。  当她来到教堂的门口,  她停下来又作了个小小的休息;  当她进入教堂,  牧师正抗拒着虚荣与罪恶作着祷告。  上看,下看,  她看见地上躺着一个死人;  从他的鼻子到下巴,  蛆们爬出,  蛆们蠕进。  然后她对牧师说,  我死后会变成这样吗?  噢,是的!  噢,是的,牧师说道,  你死后就会变成这样。  Oranges & Lemons  欢乐地摇下又摇上,伦敦的钟儿响当当。  提到枪靶和靶心,就数大钟圣马格丽特。  提到瓦片和砖头,就数大钟圣吉尔斯。  提到橘子和柠檬,就数大钟圣克雷门。  提到糕饼和馅饼,就数大钟圣彼德。  两根木棒一颗苹果,那就是大钟白教堂。  提到光头老神父,就想到大钟阿得盖特。  提到穿白围裙的女士们,就数大钟圣凯萨林。  说到火叉和火钳,就数大钟圣约翰。  说起茶壶和煎锅,就想到大钟圣安娜。  提到五毛钱和两分半,就数大钟圣马汀。  提到你欠我十先令,就想到大钟圣海伦。  要问你什麼时候还钱,就让我想到大钟老贝礼。  还钱?得等我有钱,就想到大钟休尔狄区。  等你有钱?那是什麼时候?就想到大钟史特普尼。  我也不太清楚,似是大钟包伍的回应。  应该是我老的时候吧,说话的像是大钟圣保罗。  蜡烛点燃时你该上床睡觉去,当心刀斧要你的命。
2023-07-14 11:27:331

mtv是什么

MTV的解释就是 Music TV,可直译为音乐电视。上个世界80年代初,美国有线电视网开办了一个新栏目MTV,内容都是通俗歌曲,由于节目制作精巧,歌曲都是经过精选的优秀歌曲,因此观众人数直线上升,很快就达到数千万。之后,英、法、日、澳大利亚等国家的电视台也相继开始制作播放类似节目,并为MTV的制作定型,即用最好的歌曲配以最精美的画面,使原本只是听觉艺术的歌曲,变为视觉和听觉结合的一种崭新的艺术样式。 MV的提法是近几年开始的,大家感觉“MTV”范畴有些狭窄,因为“音乐视频”并非只是局限在电视上,还可以单独发行影碟、或者通过手机、网络的方式发布,所以,就采用MV来表示了,MV的意思是 “Music Video”。 在整个80年代,人们为出现可视歌曲欣喜若狂,录像制作师们绞尽脑汁,利用各种拍摄手段、剪辑方法和特技来使片子和音乐达到奇异的结合。广播音乐节目主持人(D.J.)的概念延伸到电视音乐节目主持人(V.J.)。从流行文化角度观察可视歌曲,会发现它完全是一个混合体包括了娱乐片的一切要素,但在瞬间的处理上可视歌曲高于其他艺术,充分发挥想象,提供即时的满足感。可视歌曲置身于传播媒介娱乐圈,从流行时尚中汲取养料,像一面镜子透露流行趋势。 可视歌曲的历史大概可与电影史相联系。第一部有声电视《爵士歌手》(1927)开音乐与影像结合之先河,迪斯尼的动画片很早就发现可视素材和音乐节奏配合默契会带给人们巨大的欢悦,一些早期电影实验者曾将古典音乐制成可视音乐。40、50年代电视业兴起,10年中在电视黄金时间里播出了许多著名的流行歌曲栏目,早期的流行歌曲排行榜就是从这些节目中诞生的,最初这些节目只播出一些音乐会实况,渐渐加入了可视素材,充分抓住了流行因素。1956年,摇滚乐歌星埃尔维斯·普莱斯利获得美国青少年的一致拥戴,《伤心旅馆》、《真诚的爱》等歌曲风靡一时。同时,可视歌曲真正走进电视歌曲节目,普莱斯利为始作俑者。 1981年8月,一家专事播放可视歌曲的电视网——音乐电视网(MTV)应运而生,这家商业电视网成为历史上最热门的有线电视台。 “可视歌曲”正确英文翻译应该是MUSIC VEDIO(MV),过去许多媒体所说的MTV只是一家专门播放MUSIC VEDIO的电视网。由于先入为主的观念,许多人对这一直有个小误会。那么从今天起解决这个误会,来欣赏最COOL最IN的MUSIC VEDIO吧。
2023-07-14 11:27:341

international business

国际商业4月2宏观调控的因素,似乎理解走向更大的全球化。首先是下降的障碍,货物的自由流通,服务和资本已发生自二战结束。第二个因素是技术变革,尤其是戏剧性的发展,近年来,在通讯,信息加工,运输技术。 7日在一个纯粹的市场经济,所有的生产活动是由私人拥有,作为反对被国家所拥有。货物和服务,一个国家的产生,和数量,在他们所制作的,是没有计划任何人。生产是由相互作用的供应和需求,并示意向生产者通过价格体系。如果需求的产品超过供应,价格就会下降,信号生产者生产较少。在这个系统中,消费者主权。采购模式的消费者,标志着向生产者通过该机制的价格体系,确定什么是制作和在什么数量。 12 ,波特认为, theorizes四个广泛的属性,一个民族的形成环境,使当地企业的竞争,以及这些属性,促进或阻碍创造竞争优势。这些属性○要素禀赋---一个民族的立场,在生产要素,如熟练劳动力或必要的基础设施竞争,在一个特定行业。 ○需求条件---的性质,首页的需求,为业界提供的产品或服务。 ○有关,并支持产业---存在或没有供应商行业及相关行业的有国际竞争力。 ○企业战略,结构和竞争---条件的公司如何创造,有组织,有管理的性质和国内竞争。 13日的关税是一个征税进口。关税可分为两类。具体的关税征收作为一个固定收费,每个单位一个良好的输入(例如, 3美元至每桶石油) 。从价关税征收作为一个比例的价值,进口的好。欧洲联盟施加的这样一个关税对进口香蕉来自拉丁美洲;电费数额,以15 %到20 % ,以价值计算,就第一二百五点○○○万吨进口香蕉来自拉丁美洲。 14件重要的事是了解的关税是谁受害,谁收益。政府的收益,因为加价,政府的收入。国内生产者的增益,因为关税使它们一些保护,以免外国竞争者增加的成本,进口的外国商品。消费者失去了,因为他们必须支付更多的对某些进口。 17日的一个变种,对进口配额是自愿出口限制(查看) 。 1自愿出口限制是一个配额的贸易所施加的出口国,通常在要求进口国的政府。
2023-07-14 11:27:371

写三篇影片英文简介

  《教父》英文剧情介绍:  The story begins as "Don" Vito Corleone, the head of a New York Mafia "family", oversees his daughter"s wedding. His beloved son Michael has just come home from the war, but does not intend to become part of his father"s business. Through Michael"s life the nature of the family business becomes clear. The business of the family is just like the head of the family, kind and benevolent to those who give respect, but given to ruthless violence whenever anything stands against the good of the family. Don Vito lives his life in the way of the old country, but times are changing and some don"t want to follow the old ways and look out for community and "family". An up and coming rival of the Corleone family wants to start selling drugs in New York, and needs the Don"s influence to further his plan. The clash of the Don"s fading old world values and the new ways will demand a terrible price, especially from Michael, all for the sake of the family.  Vito Corleone is the aging don (head) of the Corleone Mafia Family. His youngest son Michael has returned from WWII just in time to see the wedding of Connie Corleone (Michael"s sister) to Carlo Rizzi. All of Michael"s family is involved with the Mafia, but Michael just wants to live a normal life. Drug dealer Virgil Sollozzo is looking for Mafia Families to offer him protection in exchange for a profit of the drug money. He approaches Don Corleone about it, but, much against the advice of the Don"s lawyer Tom Hagen, the Don is morally against the use of drugs, and turns down the offer. This does not please Sollozzo, who has the Don shot down by some of his hit men. The Don barely survives, which leads his son Michael to begin a violent mob war against Sollozzo and tears the Corleone family apart.  《肖申克的救赎》英文剧情介绍:  Andy Dufresne is a young and successful banker whose life changes drastically when he is convicted and sentenced to life imprisonment for the murder of his wife and her lover. Set in the 1940"s, the film shows how Andy, with the help of his friend Red, the prison entrepreneur, turns out to be a most unconventional prisoner. Written by Martin Lewison  After the murder of his wife, hotshot banker Andrew Dufresne is sent to Shawshank Prison, where the usual unpleasantness occurs. Over the years, he retains hope and eventually gains the respect of his fellow inmates, especially longtime convict "Red" Redding, a black marketeer, and becomes influential within the prison. Eventually, Andrew achieves his ends on his own terms.  Andy Dufresne, is sent to Shawshank Prison for the murder of his wife and secret lover. He is very isolated and lonely at first, but realises there is something deep inside your body, that people can"t touch and get to...."HOPE". Andy becomes friends with prison "fixer" Red (Morgan Freeman), and Andy epitomises why it is crucial to have dreams. His spirit and determination, leads us into a world full of imagination, filled with courage and desire. Will Andy ever realise his dreams...?  《辛德勒的名单》英文剧情介绍:  Oskar Schindler is a vain, glorious and greedy German businessman who becomes unlikely humanitarian amid the barbaric Nazi reign when he feels compelled to turn his factory into a refuge for Jews. Based on the true story of Oskar Schindler who managed to save about 1100 Jews from being gassed at the Auschwitz concentration camp. A testament for the good in all of us.  The true story of Czech born Oskar Schindler, a businessman who tried to make his fortune during the Second World War by exploiting cheap Jewish labour, but ended up penniless having saved over 1000 Polish Jews from almost certain death during the holocaust.  The true story of Oscar Schindler, a German businessman who owns a factory. He witnesses the horrifying visions of the Holocaust and the toll it takes on the Jewish people. Eventually, he creates a list of over 1100 Jews whom he saves from death.  "Schindler"s List" is the based-on-truth story of Nazi Czech business man Oskar Schindler, who uses Jewish labor to start a factory in occupied Poland. As World War II progresses, and the fate of the Jews becomes more and more clear, Schindler"s motivations switch from profit to human sympathy and he is able to save over 1100 Jews from death in the gas chambers.
2023-07-14 11:27:292

裸照的英文是什么

裸照Photograph(或 picture)of a nude;nude photo(或 picture)
2023-07-14 11:27:248

大学法语选词,“祝愿”。谢谢!

选A能和meilleurs搭配的在这里只有voeux!
2023-07-14 11:27:242

谁能帮我找下20世纪或21世纪的发明什么的 用英语叙述

这里又从1900年开始到1999年 整个20世纪的全部重大发明 自己去看一下吧~ Twentieth Century Inventions 1900 - 1925 I900 The zeppelin invented by Count Ferdinand von Zeppelin. Charles Seeberger redesigned Jesse Reno"s escalator and invented the modern escalator. 1901 King Camp Gillette invents the double-edged safety razor. The first radio receiver,successfully received a radio tran *** ission. Hubert Booth invents a pact and modern vacuum cleaner. 1902 Willis Carrier invents the air conditioner. French physicist George Claude invents neon light. The lie detector or polygraph machine is invented by James Mackenzie. The birth of the Teddy Bear. George Claude invented neon light. 1903 Edward Binney and Harold Smith co-invent crayons. Bottle-making machinery invented by Michael J.Owens. The Wright brothers invent the first gas motored and manned airplane. Mary Anderson invents windshield wipers. William Coolidge invents ductile tungsten used in lightbulbs. 1904 Teabags invented by Thomas Suillivan. Benjamin Holt invents a tractor. John A Fleming invents a vacuum diode or Fleming valve. 1905 Albert Einstein published the Theory of Relativity and made famous the equation,E = mc2. Mary Anderson receives a patent for windshield wipers. 1906 William Kellogg invents Cornflakes. Lewis Nixon invents the first sonar like device. Lee Deforest invents electronic amplifying tube (triode). 1907 Leo Baekeland invents the first synthetic plastic called Bakelite. Color photography invented by Auguste and Louis Lumiere. The very first piloted helicopter was invented by Paul Cornu. 1908 The gyropass invented by Elmer A.Sperry. Cellophane invented by Jacques E.Brandenberger. Model T first sold. J W Geiger and W Müller invent the geiger counter. Fritz Haber invents the Haber Process for making artificial nitrates. 1909 Instant coffee invented by G.Washington. 1910 Thomas Edison demonstrated the first talking motion picture. Georges Claude displayed the first neon lamp to the public on December 11,1910,in Paris. 1911 Charles Franklin Kettering invents the first automobile electrical ignition system. 1912 Motorized movie cameras invented,replaced hand-cranked cameras. The first tank patented by Australian inventor De La Mole. Clarence Crane created Life Savers candy in 1912. 1913 The crossword puzzle invented by Arthur Wynne. The Merck Chemical Company patented,what is now know as,ecstasy. Mary Phelps Jacob invents the bra. Gideon Sundback invented the modern zipper. 1914 Garrett A.Morgan invents the Morgan gas mask. 1915 Eugene Sullivan and William Taylor co-invented Pyrex in New York City. 1916 Radios tuners invented,that received different stations. Stainless steel invented by Henry Brearly. 1917 Gideon Sundback patented the modern zipper (not the first zipper). 1918 The superheterodyne radio circuit invented by Edwin Howard Armstrong.Today,every radio or television set uses this invention. Charles Jung invented fortune cookies. 1919 The pop-up toaster invented by Charles Strite. Short-wave radio invented. The flip-flop circuit invented. The arc welder invented. 1920 The tommy gun patented by John T Thompson. The Band-Aid (pronounced "ban-"dade) invented by Earle Dickson. 1921 Artificial life begins -- the first robot built. John Larson invented the lie detector. 1922 Insulin invented by Sir Frederick Grant Banting. The first 3-D movie (spectacles with one red and one green lens) is released. 1923 Garrett A.Morgan invents a traffic signal. The television or iconoscope (cathode-ray tube) invented by Vladimir Ko *** a Zworykin. John Harwood invented the self-windingwatch in 1923. Clarence Birdseye invents frozen food. 1924 The dynamic loudspeaker invented by Rice and Kellogg. Notebooks with spiral bindings invented. 1925 The mechanical television a precursor to the modern television,invented by John Logie Baird.
2023-07-14 11:27:201

求一歌曲翻译。

我也很喜欢Bon Jovi翻译倒是。。
2023-07-14 11:27:185