两支承相对小齿轮做对称分布什么意思?机械设计

A点的弯矩： MA=3kn*2m=6knm

支承搁置在墙上的是简支,简支没有支座弯矩,而第二支座（即第一中间支座）的负弯矩最大,一根梁两端负弯矩相差部分对支座反力有直接影响,设两端负弯矩差为△m,支座反力的影响就为 △R＝±△m/Lo, Lo为净跨长.所以支座边的剪力不同,一端﹢△R,另一端-△R.
第二支座的左右两侧涉及到左右两跨它端的弯矩不同,△R值各异.

楼上说的对,上支点为固定支座,下支点为可动支座,因为幕墙属于附属结构,要有一定的抗沉降变形能力,像铝合金立柱这样的细长金属构件抗拉能力比抗压能力强、稳定,所以设计时将其设计为拉弯构件,这样就可以解释宜上支点为固定支座（圆孔）,下支座长孔（可以竖向位移）

无图无真相啊

the set of machinery pretage box turnover water symbolized the
support plate copper attachment copper seals pad foot gasket sea
cotton sliver foaming material plastic bag insulating clamp support
supporting frame Ferlan

分析整个系统是静止的状态,甲需要5N的力保持静止,已通过弹簧分担了3N的力,甲还需要2N的力,甲处在地面上,另外的力就是地面给甲的支持力,也就是承受力2N.

这是肿么提问的……我工程力学就是一白痴,期末搞不好还会挂…… 这是一个单元体应力状态的问题,这类题目是这样做的,先列三个应力的值：σx、

手机不好书写.ac和cd分别为对象,画受力图,各列3个平衡方程,

一、现浇梁板式楼板布置中,主梁应沿房屋（短）方向布置,次梁与（长）方向垂直布置.
二、预制钢筋混凝土楼板的支承方式有（板式）（梁板式）两种.
三、预制钢筋混凝土空心楼板的搁置应避免出现（三边）支承情况.
四、为了减少构件规格,楼梯踏步一般选定为（等跑）并且采用（偶数）梯段.
五、窗框在墙中的位置有（外平）（居中）（内平）三种情况.

（1）小丽每只脚的面积为S₀=28×5cm²=140cm²=1.4×10^-2m²；
小丽双脚站立时对地面的压力为F=G=mg=56kg×10N/kg=560N，
受力面积为S=2S₀=2×1.4×10^-2m²=2.8×10^-2m²，
小丽双脚站立时对地面的压强为p=[F/S]=
560N
2.8×10−2m2=2×10⁴Pa；
（2）在每次跳绳中，她克服重力做功为W₀=Gh=560N×0.1m=56J；
答：（1）小丽双脚站立时对地面的压强为2×10⁴Pa；
（2）在每次跳绳中克服重力做功为56J．

Chassis：The function of chassis is to support, install engine and all related components, which formed the total look of the automobile. It also accepts the power from engine, which moves car and ensure normal driving. Chassis is mad of 4 parts like transmission system, running gear system, steering system and control system.

16倍

你说的是弹簧两端螺距变小的那部分吗?如果是你可以把弹簧做三部分,中间螺距正常,两端的做到明显减少,然后用桥接把它们连上

楼主连支座约束力和约束反力都搞不清楚,难怪这么简单的题都不会做

个人认为 得有理论力学的底子才行 就是解小振动方程

当作用为集中力时，都看做作用在基本部分上，当作用为力偶时，就要分作用在节点左右两种情况

这个与杆的截面形状有关,如果相同的截面形状,则杆长增加,临界力会减小.

不是,完全定位是六点定位.

五、 1、C 2 C 3 D 4 C
六、 1、 C 2 B 3 A 4 B
七、 1、C 2 D 3C 4 A

AB受2个力,重力和线的拉力,现要求这两个力相互抵消.
重力大小为G,力臂为(L/2)*cos（90°-α）.
拉力大小为Q的重力,力臂为L*cos(α/2).
列个方程就解出α的表达式

解题思路：（1）先求出该同学双脚站立时地面的受力面积，人对水平地面的压力等于自身的重力，根据公式压强公式求出对地面的压强；
（3）根据W=Gh求出每次跳绳中克服重力所做的功；
（4）先求出1min做的总功，再根据P=[W/t]求出小丽的平均功率．

（1）小丽双脚站立时的面积：
S_总=2×0.014m²=0.028m²，
对地面的压力：
F=G=mg=46.2kg×10N/kg=462N，
对地面的压强：
p=[F/S]=[462N
0.028m2=1.65×10⁴Pa；
（2）在每次跳绳中，她克服重力做功：
W=Gh=462N×0.1m=46.2J；
（3）在跳绳中，小丽的平均功率：
P=
W/t]=[46.2J

120/60s]=92.4W．
答：（1）小丽双脚站立时（两脚面积相等）对地面的压强是1.65×10⁴Pa；
（2）在每次跳绳中，她克服重力做功是46.2J；
（3）在跳绳中，小丽的平均功率是92.4W．

点评：
本题考点： 压强的大小及其计算；功的计算；功率的计算．

考点点评： 本题考查了压力、压强的计算，以及功、功率的计算，关键是公式的灵活运用，解题过程中要注意单位的换算．

解题思路：音色是由发声体本身决定的，发声体有变化，音色也将变化

火车的车轮和支承弹簧正常时，发出的音色清脆悦耳；当车轮或支撑弹簧发生异常时，结构发生变化，所以音色与正常情况下有所不同，所以是根据音色来判断车轮和支承弹簧是否正常的．
故选B．

点评：
本题考点： 音色．

考点点评： 此题考查的是音色的应用，需要清楚的是，不同的发声体发声的音调、响度可能相同，但音色很难完全一致．

　　半轴的作用是将差速器传来的转矩再传给车轮,推动汽车行驶.
　　现代汽车所采用的半轴支承形式,常见的有全浮式和半浮式两种,而以全浮式应用最为广泛.
　　①全浮式半轴的内端插入半轴齿轮的花键孔中,外端与轮毅相连,支撑半轴的轴承装在轮载与桥壳之间,这种支撑形式的车辆载荷全部由桥壳承受,半轴仅用来驱动车轮,仅承受转矩,不承受弯矩.
　　②半浮式结构在小汽车上被广泛采用,半轴的轴承装在半轴与桥壳之间,车轮直接固定在半轴上,车辆载荷和转弯时横向载荷全部作用在半轴,外端承受全部弯扭.

(B) chassis
Role is to support the chassis, engine and the installation of car parts, assembly, to form the overall shape of the car, and accept the power of the engine so that the sports car have to ensure normal traffic. The chassis by the power train, traveling system, steering and braking system components.
1, power train
By the power train clutch, transmission, universal joints and drive axle gear, the engine will be used to export power to the driving wheel, as well as to adapt with the car.
Clutch in the fixed-end after the engine flywheel and transmission and connected. Often in a state of clutch engagement. When the driver down the clutch pedal, clutch, power transmission interrupted for starting, braking and shifting operations items. Clutch can slip through the implementation of the transmission line overload protection.
Transmission has on a number of forward gear and a reverse gear, the gear transmission ratio is not the same as to meet the vehicle traveling at different speeds and under the resistance. Reverse gear can make the car drive down the achievement. "Gap" can interrupt transmission of power.
Universal gear transmission is located between the bridge and drive to the output of power transmission drives can be spread to the bridge.
Bridge drive from the main reducer, and differential and axle and axle housing, of which there is a bridge (most of the rear axle) is the drive axle, the car driver, and another bridge (most of the front axle) driven to the bridge , The role can not afford to drive. However, off-road vehicle drivers are all vehicular bridge at the bridge, the transmission in the back with sub-actuators, is responsible for the distribution of power to the bridge.
2, the Department of traveling
Department of motor vehicles traveling on the basis of the frame, Axles, wheels and tires and the vehicle-bridge is located between the frame and suspension components. Frame of a car assembly base, will be loaded into one vehicle as a whole. Axle and wheel responsible for driving the car, suspension components. Frame of a car assembly base, will be loaded into one vehicle as a whole. Axle and wheel responsible for driving the car, the suspension of vehicular bridge will be installed in the chassis, power-play, directed and shock absorption buffer. In addition to the impact of the Department of driving the vehicle handling and stability, but also for cars traveling in comfort plays an important influence.
3, to the Department of
Department to be used to restore or change the car's direction of travel. It is by making the front car with a relatively flat vertical deflection of a certain angle to the realization. To the main line to manipulation by the agencies, and the steering gear-shift composition of the motive.
4, braking system
The braking system is so moving up to the rapid deceleration of the vehicle to stop, the car is parked in the presence of a reliable stay put. Traffic in the brake on each wheel brakes and brake control agencies, through the brake pedal by the driver to manipulate. Parking brake brakes are installed in the transmission of the second axis, but most of the rear axle and brake-in-one, parking brake by hand to manipulate the joystick.
(C) body
Body to accommodate drivers, passengers and cargo, and constitute a case of motor vehicles. From the cab of the truck body Huoxiang, and the passenger of the car body constituted by the unification of Shell. Other special vehicles also includes other special equipment. Body also includes doors, windows, locks, internal and external accessories, accessories, car seats and the former sheet metal, and so on.
(D) electrical equipment
Electrical equipment from power and electricity equipment. Including power generators and batteries. The contents of a lot of electrical equipment, different models is not as mainly in the ignition system, starting system, lighting, instrument signal system, air-conditioning and other electricity equipment.
To return

如图,C点只有垂直的AC杆,因此整个体系只在D点收铰链的水平约束力,大小于F2一样为40KN,方向向左.再通过ΣM＝0,对A和D点进行分析得出两铰链的向上支撑力.
D点ΣM＝0 30×2＋30＋20×4×2－40×1－F′×4＝0 得C点的支撑力F′＝52.5KN
A点ΣM＝0 30×2＋40×1＋20×4×2－30－F″×4＝0 得D点的支撑力F″＝57.5KN

再逐一对各点进行分析：
D点：可得出AD杆受压10√17KN,BD杆受压47.5KN.

A点：可得出AC杆受压62.5KN,AB杆受拉40KN.
﹙AB杆单拿出分析可得此点外力：∑M＝0 F外′×4－30－30×2－20×4×2＝0 → F外′ ＝62.5KN﹚


可由B点验算.
﹙同上,∑M＝0 F外″×4＋30－30×2－20×4×2＝0 → F外″＝47.5KN﹚

正确.最大变形不超过6mm.

第一个问题是立杆整体稳定性计算（组合槽钢）,形心主惯性矩Iy比Iz要小得多,受力后Iy方向容易失稳,所以用B加大ly的形心距来增大ly的形心主惯性矩,使ly的形心主惯性矩与lz尽量相同,二个方向受力均匀.
第二个问题是立杆局部稳定性计算（单个槽钢）,h决定16号槽钢计算长度Lo,Lo过大会引起单个槽钢局部失稳.

沿着重力方向带箭头的直线,叫重力作用线.这条线在现实中其实是不存在的,我们只是为了方便表示重力,作出的这么一条（或多条）线而已.
支撑物体的面,就叫支撑面,支撑面一般对它所支撑的物体施加反作用力,用来克服物体的重力.

传递系数,0.5

这是超静定梁,分成AB,BC两段,再根据B处各量相同,

因冲压车间连续模的落料工序镶件（刀口）磨损严重（刀口崩裂）,最终造成电机支承有批锋（如下图所示）.x05
For pressing workshop of continuous mode blanking process set piece (blade) badly worn (blade open),resulting in motor bearing of feng (shown below).x05
此镶件（刀口）周围边沿处磨损严重,造成电机支承有批锋.x05
This set piece (knife edge place badly worn around),cause motor bearing of feng.x05
1、冲压车间在第一时间内及时更换镶件（刀口）,并对关键零件模具制定点检和维修保养记录跟进表；x05
1,pressing workshop in the first time change in time set piece (blade),and the key parts moulds and maintenance record tally for follow up table;x05
确保模具在使用之前无磨损等不良现象,对模具处于寿命老化破损状态下能及时反馈维修和报废处理；x05
Ensure mold before use wear no bad phenomenon,in the life of die aging state feedback damaged can maintenance and disposal;x05
2、五金PQC在产品制程过程中,要求每半小时进行抽检一次,从而及时发现类似的不良问题的出现.x05
2,hardware PQC in product process in the process,asked every half an hour to a sampling,and the timely discovery similar bad problem arises.

不是哈,确定轴径的最小尺寸,选用支撑件,轴承或者轴承座,这些都是标准件或者通用件,那样就根据所选标准件或者通用件的尺寸确定支撑轴的长度.

不在一条直线上的3个点,确定一个平面.就是说,“当工件与定位支承呈面接触时”,在同一平面上,有3个点定位.
此时,工件有3个自由度没有被限制.在平面上有2个沿平面移动的自由度、绕垂直于平面的轴线的转动.
被限制的3个自由度是,沿垂直于平面的轴线的移动、2个“翻转”转动.

首先,你要考虑到两个容器中的液体不是同一种液体(换句话说,它们密度不同)
1."压力÷受力面积＝压强".题中说底面积相等,且压强(甲)大于压强(乙),根据公式就可压力(甲)大于压力(乙).
2.因为液体对容器底的压力即等于它们自身所受重力,根据第一问可知液体(甲)的质量大于液体(乙)质量,所以液体对甲容器底的压力比乙容器底受的压力要大.
3.根据上两问的结论,再用问题一中的公式,就可推出.

解题思路：音色是由发声体本身决定的，发声体有变化，音色也将变化

火车的车轮和支承弹簧正常时，发出的音色清脆悦耳；当车轮或支撑弹簧发生异常时，结构发生变化，所以音色与正常情况下有所不同，所以是根据音色来判断车轮和支承弹簧是否正常的．
故选B．

点评：
本题考点： 音色．

考点点评： 此题考查的是音色的应用，需要清楚的是，不同的发声体发声的音调、响度可能相同，但音色很难完全一致．

简单