电大机电一体化系统设计基础课程形考作业1(修改)

1、机电一体化系统设计基础课程形成性考核作业姓名_学号_形成性考核作业1一、判断题（正确的打，错误的打）1机电一体化系统的主要功能就是对输入的物质按照要求进行处理，输出具有所需特性的物质。（ ） 2. 系统论、信息论、控制论是机电一体化技术的理论基础，是机电一体化技术的方法论。（ ） 3信息处理技术是指在机电一体化产品工作过程中，与工作过程各种参数和状态以及自动控制有关的信息输入、识别、变换、运算、存储、输出和决策分析等技术。（ ）4自动控制是在人直接参与的情况下，通过控制器使被控对象或过程自动地按照预定的规律运行。（ ）5产品的组成零部件和装配精度高，系统的精度一定就高。（ ）6为减少机械传动部

2、件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的23倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。（ ）7传动机构的转动惯量取决于机构中各部件的质量和转速。（ ）8在闭环系统中，因齿轮副的啮合间隙而造成的传动死区能使系统以610倍的间隙角产生低频振荡，采用消隙装置，以提高传动精度和系统稳定性。（ ）9进行机械系统结构设计时，由于阻尼对系统的精度和快速响应性均产生不利的影响，因此机械系统的阻尼比取值越小越好。（ ）10滚珠丝杠垂直传动时，必须在系统中附加自锁或制动装置。（ ）11采用偏心轴套调整法对齿轮传动的侧隙进行

3、调整，结构简单，且可以自动补偿侧隙。（ ）12采用虚拟样机代替物理样机对产品进行创新设计测试和评估，延长了产品开发周期，增加了产品开发成本，但是可以改进产品设计质量，提高面向客户与市场需求能力。（ ）二、单选题1 以下产品属于机电一体化产品的是（ ）。a游标卡尺 b电话c全自动洗衣机 d非指针式电子表2为提高机电一体化机械传动系统的固有频率，应设法（ ）。 a增大系统刚度 b增大系统转动惯量c增大系统的驱动力矩 d减小系统的摩擦阻力3导程l0=8mm的丝杠驱动总质量为60kg的工作台与工件，则其折算到丝杠上的等效转动惯量为（ ）kgmm2。 a48.5 b97c4.85 d9.74传动系统的固

4、有频率对传动精度有影响，（ ）固有频率可减小系统地传动误差，（ ）系统刚度可提高固有频率。a提高，提高 b提高，减小c减小，提高 d减小，减小5下列哪种方法是采用单螺母预紧原理来消除滚珠丝杠副的间隙？（ ） a螺纹调隙式 b双螺母垫片调隙式c齿差调隙式 d偏置导程法6. 齿轮传动的总等效惯量随传动级数( )。 a.增加而减小 b.增加而增加c.减小而减小 d.变化而不变7多级齿轮传动中，各级传动比“前小后大”的分配原则不适用于按（ ）设计的传动链。 a最小等效转动惯量原则（小功率传动装置）b最小等效转动惯量原则（大功率传动装置）c输出轴的转角误差最小原则d重量最轻原则8某机电一体化系统需要消除

5、齿轮传动的齿侧间隙，采取下列哪种方法使得调整过程中能自动补偿齿侧间隙？（ ） a偏心套调整法 b轴向垫片调整法c薄片错齿调整法 d轴向压簧错齿调整法三、简答题1完善的机电一体化系统主要包括哪几部分？答：机械本体、动力系统、检测传感系统、执行部件和信息处理及控制系统五部分相互协调，共同完成所规定的目的功能。通过接口及相应软件有机结合在一起，构成内部匹配合理、外部效能最佳的完整产品。2简述机电一体化系统中的接口的作用。3机械运动中的摩擦和阻尼会降低效率，但是设计中要适当选择其参数，而不是越小越好。为什么？4简述机械系统的刚度对系统动态特性的影响。四、计算题1.某工作台采用直流电机丝杠螺母机构驱动如

6、图所示，已知电机轴的转动惯量jm=410-4kgm2，与电机输出轴相连的小齿轮的转动惯量j1=110-4kgm2，大齿轮的转动惯量j2=1.810-4kgm2，丝杠的转动惯量js=3.810-4kgm2。工作台的质量m=50kg，丝杠导程t=5mm，齿轮减速比为i=5。试求：（1）工作台折算到丝杠的等效转动惯量jg；（2）传动件折算到电机轴的等效转动惯量je；（3）电机轴上的总转动惯量j。工作台丝杠 滚珠螺母齿轮减速器联轴器dc伺服电机i=5图 直流电机丝杠螺母机构驱动工作台2.已知某四级齿轮传动系统，各齿轮的转角误差为1=2=8=0.01弧度，各级减速比相同，即i1 = i2 = i4 =3

7、，求该系统的最大转角误差max。五、综合题1. 分析下图调整齿侧间隙的原理。1. 锁紧螺母 2. 圆螺母 3. 带凸缘螺母 4.无凸缘螺母待添加的隐藏文字内容32.分析下图中传动大负载时消除齿侧间隙的原理。1、6小齿轮 2、5大齿轮 3齿轮 4预载装置 7齿条if we dont do that it will go on and go on. we have to stop it; we need the courage to do it.his comments came hours after fifa vice-president jeffrey webb - also in lond

8、on for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general director roman babaev says the matter has been exaggerated by the ivorian and the british media.blatter, 77, said: it has been decided by the fifa congress that it is a nonsense

9、 for racism to be dealt with with fines. you can always find money from somebody to pay them.it is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. it is all nonsense.we can do something better to fight racism and discri

10、mination.this is one of the villains we have today in our game. but it is only with harsh sanctions that racism and discrimination can be washed out of football.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associa

11、tions 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.u

12、efa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures

13、 complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in this mission. starting at the ground, conditions have to be

14、 very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8

15、.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet

16、 ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. still, hell be traveling fast, so despite the distance, it will not be like diving into th

17、e deep end of a pool. it will be like he is diving into the shallow end.skydiver preps for the big jumpwhen he jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. like hitting the top of the water, he will begin to slow as he approaches the more dense a

18、ir closer to earth. but this will not be enough to stop him completely.if he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. his team hopes its not needed. instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).in order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). he will have a reserve parachu