電大機電一體化系統(tǒng)設(shè)計基礎(chǔ)課程作業(yè)解答(一)

1、機電一體化系統(tǒng)設(shè)計基礎(chǔ)課程作業(yè)解答（一）一、填空題1控制計算機 控制軟件 硬件接口電路2民用機電一體化 辦公機電一體化 產(chǎn)業(yè)機電一體化3質(zhì)量目標管理 實行可行性設(shè)計 進行設(shè)計質(zhì)量評審4定期預測 定量預測5精度 穩(wěn)定性 快速響應性6前小后大7轉(zhuǎn)子慣量8傳動誤差 回程誤差二、簡答題1機電一體化系統(tǒng)中，傳感測試部分的作用是什么？機電一體化系統(tǒng)中傳感測試部分的作用是對系統(tǒng)運行中所需要的本身和外界環(huán)境的各種參數(shù)及狀態(tài)進行檢測，變?yōu)榭勺R別的信號，傳輸?shù)叫畔⑻幚韱卧?，?jīng)分析處理后產(chǎn)生控制信息。2簡述機電一體化產(chǎn)品設(shè)計的工程路線（主要步驟）機電一體化產(chǎn)品設(shè)計的工程路線（主要步驟）：擬定產(chǎn)品開發(fā)目標和技術(shù)規(guī)范；

2、收集資 料，市場分析，可行性分析和技術(shù)經(jīng)濟性分析；總體方案設(shè)計；總體方案的評審和評價；詳細設(shè)計；詳細設(shè)計方案的評審和評價；試制樣機；樣機實驗，測試；技術(shù)評價與審定；小批量生產(chǎn)；試銷；正常生產(chǎn)；銷售。3為什么采用機電一體化技術(shù)可以提高系統(tǒng)的精度？機電一體化技術(shù)使機械傳動部分減少，因而使機械磨損，配合間隙及受力變形等所引起的誤差大大減少，同時由于采用電子技術(shù)實現(xiàn)自動檢測，控制，補償和校正因各種干擾因素造成的誤差，從而提高精度。4影響機電一體化系統(tǒng)傳動機構(gòu)動力學特性的主要因素有哪些？影響系統(tǒng)傳動機構(gòu)動力學特性的主要因素有系統(tǒng)的負載變化；傳動系統(tǒng)的慣性；傳動系統(tǒng)的固有頻率；傳動系統(tǒng)中的摩擦與潤滑。5轉(zhuǎn)

3、動慣量對傳動系統(tǒng)有哪些影響？在傳動系統(tǒng)中，轉(zhuǎn)動慣量增大使機械負載增加，功率消耗大；使系統(tǒng)相應速度變慢，降低靈敏度；使系統(tǒng)固有頻率下降，容易產(chǎn)生諧振。6為減小機械系統(tǒng)的傳動誤差，可采用哪些結(jié)構(gòu)措施？減小機械系統(tǒng)的傳動誤差可采用的結(jié)構(gòu)措施有：適當提高零部件本身的精度；合理設(shè)計傳動鏈，減小零部件制造、裝配誤差對傳動精度的影響；采用消隙機構(gòu)，以減小或消除回程誤差。三、計算題1圖示絲杠螺母驅(qū)動系統(tǒng)，已知工作臺的質(zhì)量m=200kg，絲杠螺距t=5mm,絲杠長度l=0.8m,中徑為d=30mm,材料密度為，齒輪齒數(shù)分別為z120，z245，模數(shù)m2mm，齒寬b20mm。試求折算到電機軸上的總等效慣量j？解：

4、（1）計算各傳動件的轉(zhuǎn)動慣量材料密度，齒輪的計算直徑按分度圓直徑計算，絲杠的計算直徑取中徑。由工作臺折算到絲杠上的轉(zhuǎn)動慣量為（2）折算到電機軸上的轉(zhuǎn)動慣量2試設(shè)計一數(shù)控機床工作臺用滾珠絲杠副。已知平均載荷fm3600n，絲杠工作長度l1.25m，平均轉(zhuǎn)速nm120r/min，每天開機6h，每年250個工作日計，要求工作10年以上。絲杠材料為crwmn鋼，滾道硬度為5862hrc，絲杠傳動精度要求為0.03mm。解：（1）求計算載荷由題設(shè)條件，查表3.4取kf1.2，查表3.5取kh1.0，假設(shè)絲杠為d級精度，查表3.6，取ka1.0。則計算載荷 fckfkhkafm1.21.01.036004

5、320 n（2）計算所要求的額定動載荷ca預期使用壽命 lh62501015000h并代入 nm120r/min，fc4320n（3）根據(jù)ca的值選擇滾珠絲杠副設(shè)選用fci型號系列，按照滿足caca的原則，并考慮各種因素，查表3.7選出合用的滾珠絲杠型號規(guī)格為fci-5006-3，其主要參數(shù)尺寸：公稱直徑 d050mm導程 l06mm螺旋角 211滾珠直徑 d03.969mm絲杠小徑 d145.63mm（4）檢驗穩(wěn)定性取彈性模量 e2.06105 mpa，查表3.8長度系數(shù)2/3絲杠軸慣性矩 不發(fā)生失穩(wěn)之最大載荷安全系數(shù) 查表3.8 許用安全系數(shù)s2.53.3。由ss，可知絲杠是安全的，穩(wěn)定性

6、合乎要求。（5）檢驗剛度計算轉(zhuǎn)矩 取摩擦系數(shù)f0.002，則arctan0.002653按最不利情況計算導程誤差，每個導程的變形量=6.44102m絲杠在工作長度上的導程誤差通常，絲杠的導程誤差l應小于其傳動精度的1/2，即絲杠的剛度滿足要求。經(jīng)上述計算驗證，所選fci-5006-3型絲杠各項性能均符合使用要求，可用。四、分析題按照機電一體化系統(tǒng)的基本結(jié)構(gòu)要素，圖示數(shù)控機床的各個部分歸類如下： （1）控制及信息處理單元： 鍵盤、計算機、顯示（2）測試傳感部分： 光電編碼器、信號處理（3）能源： 電源（4）驅(qū)動部分： 功放、電機（5）執(zhí)行機構(gòu)： 聯(lián)軸器、齒輪減速器、絲杠螺母機構(gòu)、工作臺if we

7、 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 director rom

8、an 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 played wi

9、thout 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 can

10、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 tomo

11、rrow 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, president

12、 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: mis

13、sion 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, will

14、 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 strat

15、osphere. 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 conc

16、rete 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 expected to

17、 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 stabilizat

18、ion 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