机械原理试卷参考答案

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1、机械原理试卷 （参考答案） 机械原理试卷参考答案 （1） 一、填空题： （30分） 1机构中的速度瞬心是两构件上（相对速度 ）为零的重合点，它用于平面机构（ 速度 ）分析。 2下列机构中，若给定各杆长度，以最长杆为连架杆时，第一组为 （ 双摇杆机构 ）机构；第二组为（ 曲柄摇杆机构 ）机构。 (1) a = 250 b = 200 c = 80 d = 100； (2) a = 90 b = 200 c = 210 d = 100 。 3.机构和零件不同，构件是（运动的单元 ），而零件是（制造的单元 ）。 4凸轮的基圆半径越小，则机构尺寸（越大 ）但过于小的基圆半径会导致压力角（增大 ）。 5

2、用齿条型刀具范成法切制渐开线齿轮时，为使标准齿轮不发生根切，应使刀具的（齿顶线不超过极限啮合点 ）。 6当要求凸轮机构从动件的运动没有冲击时，应选用（摆线运动）规律。 7间歇凸轮机构是将（主动轮的连续转动）转化为（从动转盘的间歇 ）的运动。8刚性转子的平衡中，当转子的质量分布不在一个平面内时，应采用 （动平衡 ）方法平衡。其平衡条件为（M = O ；F = 0 ）。 1 9机械的等效动力学模型的建立，其等效原则是：等效构件所具有的动能应（ 等于整个系统的总动能 ）。等效力、等效力矩所作的功或瞬时功率应（等于整个系统的所有力，所有力矩所作的功或所产生的功率之和 ）。 10平面机构结构分析中，基本

3、杆组的结构公式是（ 3n = 2PL ）。而动态静力分析中，静定条件是（ 3n = 2PL ）。 四、 选择题： （20分） 1渐开线齿轮齿条啮合时，若齿条相对齿轮作远离圆心的平移，其啮合角（ B ）。 A)增大 ； B)不变； C)减少。 2为保证一对渐开线齿轮可靠地连续传动，应便实际啮合线长度（ C ）基圆齿距。 A)等于； B)小于； C)大于。 3高副低代中的虚拟构件的自由度为（ A ）。 A) -1 ； B) +1 ； C) 0 ； 4压力角是在不考虑摩擦情况下，作用力与作用点的（ B ）方向的夹角。 A)法线； B)速度； C)加速度； D)切线； 5理论廓线相同而实际廓线不同的两

4、个对心直动滚子从动件盘形凸轮，其推杆的运动规律是（ A ）。A)相同的； B)不相同的； C)不一定的。 6飞轮调速是因为它能（ C ）能量，装飞轮后以后，机器的速度波动可以（ B ）。 A)生产； B)消耗； C)储存和放出。 A)消除； B)减小； C)增大。 7作平面运动的三个构件有被此相关的三个瞬心。这三个瞬心（ C ）。 A)是重合的； B)不在同一条直线上； C)在一条直线上的。 8渐开线标准齿轮在标准安装情况下，两齿轮分度圆的相对位置应该是（ C ）。 A)相交的； B)分离的； C)相切的。 9齿轮根切的现象发生在（ D ）的场合。 D) 模数较大； B)模数较小； C)齿数较

5、多； D)齿数较少 10重合度 6 1. =ae 表示一对轮齿啮合的时间在齿轮转过一个基圆齿距的时间内占（ A ）。 A) 40%； B) 60%； C) 25% 三计算下列机构自由度。 (10分)F = 3 5 2 6 1 = 2 F = 3 8 2 11 1 = 1 四、 图示轮系中，已知 Z11（右旋），Z260，Z340，Z420， Z518，齿轮3、4、5、6 的模数和压力角分别相等。求 Z6 齿数和传动比i1H 。 (10分)（英文版 ） easily blame, to prevent the broken window effect. Supervise the leading

6、 cadres to play an exemplary role, take the lead in the strict implementation of the and , lead to safeguard the solemnity and authority of the party discipline, ensure that the party discipline and the laws and regulations for implementation in place. Throughout the discipline in the daily supervis

7、ion and management, strengthen supervision and inspection, from the thorough investigation of violations of discipline behavior. Strengthen to key areas, key departments and key projects as well as the masses reflect the concentration of the units and departments for supervision. - strengthening sup

8、ervision, discipline inspection and supervision of cadres to set an example for compliance with the and is a man must be hexyl, blacksmith needs its own hardware. Discipline inspection organs as the executor of the party discipline, and supervisor of the defenders, for its supervision must be more s

9、trictly, discipline inspection and supervision of cadres to firmly establish the awareness of Party Constitution, sense of discipline and rules consciousness, politics loyalty, sense obey. Action speak Ji Ordinance to set an example of the regulations of the rule of law, strengthen supervision and a

10、ccept the supervision of the firmness and consciousness, do comply with and . To firmly establish the discipline must first be disciplined, the supervisor will be subject to the supervision of concept, and consciously safeguard and implement party compasses party, take the lead in practicing three s

11、trict real strict, so loyal, clean, play. To be good at learning, the Constitution and the as morality, politics and brought to fruition; to implement , do not want to, dare not, not with disciplinary ruler to supervision; to discipline a ruler, often the control inspection, and consciously in the i

12、deological red line to draw the row Ming Good accumulation is indeed the bottom line, so that the heart has fear, said to have quit, the line has ended. Attached: indifferent to heart, calmly to the table in our life, there are many unpredictable things will happen, some good, some bad things, we ca

13、nnot control is powerless to stop, but with time, you will find in life sometimes turns out to be not good, some bad things finally turned out to be a good thing, but then we muddy however did not know, this is the life teach us things. 1, life can be complex, can also be simple. Want simple life of

14、 precipitation, to have enough time to reflect, to make Become more perfect. Life is the most important thing is not to win, but the struggle; not to have conquered, but to have fought well. 2, the plain is the background of life. Live a plain life, give up on themselves is not a coward, but the wise answers; not disillusioned after the heart, such as ashes, but experience the storm after the enlightenment; not unrewarding perfunctorily, but calm attitude of life of unrestrained self-confiden