电大机电一体化系统设计基础课程作业解答(一)

1、专业好文档机电一体化系统设计基础课程作业解答（一）一、填空题1控制计算机 控制软件 硬件接口电路2民用机电一体化 办公机电一体化 产业机电一体化3质量目标管理 实行可行性设计 进行设计质量评审4定期预测 定量预测5精度 稳定性 快速响应性6前小后大7转子惯量8传动误差 回程误差二、简答题1机电一体化系统中，传感测试部分的作用是什么？机电一体化系统中传感测试部分的作用是对系统运行中所需要的本身和外界环境的各种参数及状态进行检测，变为可识别的信号，传输到信息处理单元，经分析处理后产生控制信息。2简述机电一体化产品设计的工程路线（主要步骤）机电一体化产品设计的工程路线（主要步骤）：拟定产品开发目标和

2、技术规范；收集资 料，市场分析，可行性分析和技术经济性分析；总体方案设计；总体方案的评审和评价；详细设计；详细设计方案的评审和评价；试制样机；样机实验，测试；技术评价与审定；小批量生产；试销；正常生产；销售。3为什么采用机电一体化技术可以提高系统的精度？机电一体化技术使机械传动部分减少，因而使机械磨损，配合间隙及受力变形等所引起的误差大大减少，同时由于采用电子技术实现自动检测，控制，补偿和校正因各种干扰因素造成的误差，从而提高精度。4影响机电一体化系统传动机构动力学特性的主要因素有哪些？影响系统传动机构动力学特性的主要因素有系统的负载变化；传动系统的惯性；传动系统的固有频率；传动系统中的摩擦与

3、润滑。5转动惯量对传动系统有哪些影响？在传动系统中，转动惯量增大使机械负载增加，功率消耗大；使系统相应速度变慢，降低灵敏度；使系统固有频率下降，容易产生谐振。6为减小机械系统的传动误差，可采用哪些结构措施？减小机械系统的传动误差可采用的结构措施有：适当提高零部件本身的精度；合理设计传动链，减小零部件制造、装配误差对传动精度的影响；采用消隙机构，以减小或消除回程误差。三、计算题1图示丝杠螺母驱动系统，已知工作台的质量m=200kg，丝杠螺距t=5mm,丝杠长度l=0.8m,中径为d=30mm,材料密度为，齿轮齿数分别为z120，z245，模数m2mm，齿宽b20mm。试求折算到电机轴上的总等效惯

4、量j？解：（1）计算各传动件的转动惯量材料密度，齿轮的计算直径按分度圆直径计算，丝杠的计算直径取中径。由工作台折算到丝杠上的转动惯量为（2）折算到电机轴上的转动惯量2试设计一数控机床工作台用滚珠丝杠副。已知平均载荷fm3600n，丝杠工作长度l1.25m，平均转速nm120r/min，每天开机6h，每年250个工作日计，要求工作10年以上。丝杠材料为crwmn钢，滚道硬度为5862hrc，丝杠传动精度要求为0.03mm。解：（1）求计算载荷由题设条件，查表3.4取kf1.2，查表3.5取kh1.0，假设丝杠为d级精度，查表3.6，取ka1.0。则计算载荷 fckfkhkafm1.21.01.0

5、36004320 n（2）计算所要求的额定动载荷ca预期使用寿命 lh62501015000h并代入 nm120r/min，fc4320n（3）根据ca的值选择滚珠丝杠副设选用fci型号系列，按照满足caca的原则，并考虑各种因素，查表3.7选出合用的滚珠丝杠型号规格为fci-5006-3，其主要参数尺寸：公称直径 d050mm导程 l06mm螺旋角 211滚珠直径 d03.969mm丝杠小径 d145.63mm（4）检验稳定性取弹性模量 e2.06105 mpa，查表3.8长度系数2/3丝杠轴惯性矩 不发生失稳之最大载荷安全系数 查表3.8 许用安全系数s2.53.3。由ss，可知丝杠是安全

6、的，稳定性合乎要求。（5）检验刚度计算转矩 取摩擦系数f0.002，则arctan0.002653按最不利情况计算导程误差，每个导程的变形量=6.44102m丝杠在工作长度上的导程误差通常，丝杠的导程误差l应小于其传动精度的1/2，即丝杠的刚度满足要求。经上述计算验证，所选fci-5006-3型丝杠各项性能均符合使用要求，可用。四、分析题按照机电一体化系统的基本结构要素，图示数控机床的各个部分归类如下： （1）控制及信息处理单元： 键盘、计算机、显示（2）测试传感部分： 光电编码器、信号处理（3）能源： 电源（4）驱动部分： 功放、电机（5）执行机构： 联轴器、齿轮减速器、丝杠螺母机构、工作台

7、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 london for the fas celebrations - said he wanted to meet ivory coast international toure to discuss his complaint.cska general directo

8、r 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 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 play

9、ed 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 discrimination.this is one of the villains we have today in our game. but it is only with harsh sanctions that racism and discrimination

10、 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 associations 150th anniversary celebrations and will attend citys premier league match at chelsea on sunday.i am going to be at the match

11、 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.uefa hasopened disciplinary proceedings against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, pres

12、ident of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no racist insults from fans of cska.baumgartner the disappointing news

13、: 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 very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. the balloon, with capsule attached,

14、 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/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the

15、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 ( then, i would assume, he will slowly step out onto something resembling an olympic diving platform.below, the earth becomes the

16、 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 the 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 expect

17、ed 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 air 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 stabi

18、lization 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 parachute tha