電大機電一體化系統(tǒng)設計基礎課程形考作業(yè)1(修改)

1、專業(yè)好文檔機電一體化系統(tǒng)設計基礎課程形成性考核作業(yè)姓名_學號_形成性考核作業(yè)1一、判斷題（正確的打，錯誤的打）1機電一體化系統(tǒng)的主要功能就是對輸入的物質按照要求進行處理，輸出具有所需特性的物質。（ ） 2. 系統(tǒng)論、信息論、控制論是機電一體化技術的理論基礎，是機電一體化技術的方法論。（ ） 3信息處理技術是指在機電一體化產品工作過程中，與工作過程各種參數(shù)和狀態(tài)以及自動控制有關的信息輸入、識別、變換、運算、存儲、輸出和決策分析等技術。（ ）4自動控制是在人直接參與的情況下，通過控制器使被控對象或過程自動地按照預定的規(guī)律運行。（ ）5產品的組成零部件和裝配精度高，系統(tǒng)的精度一定就高。（ ）6為減少

2、機械傳動部件的扭矩反饋對電機動態(tài)性能的影響，機械傳動系統(tǒng)的基本固有頻率應低于電氣驅動部件的固有頻率的23倍，同時，傳動系統(tǒng)的固有頻率應接近控制系統(tǒng)的工作頻率，以免系統(tǒng)產生振蕩而失去穩(wěn)定性。（ ）7傳動機構的轉動慣量取決于機構中各部件的質量和轉速。（ ）8在閉環(huán)系統(tǒng)中，因齒輪副的嚙合間隙而造成的傳動死區(qū)能使系統(tǒng)以610倍的間隙角產生低頻振蕩，采用消隙裝置，以提高傳動精度和系統(tǒng)穩(wěn)定性。（ ）9進行機械系統(tǒng)結構設計時，由于阻尼對系統(tǒng)的精度和快速響應性均產生不利的影響，因此機械系統(tǒng)的阻尼比取值越小越好。（ ）10滾珠絲杠垂直傳動時，必須在系統(tǒng)中附加自鎖或制動裝置。（ ）11采用偏心軸套調整法對齒輪傳動

3、的側隙進行調整，結構簡單，且可以自動補償側隙。（ ）12采用虛擬樣機代替物理樣機對產品進行創(chuàng)新設計測試和評估，延長了產品開發(fā)周期，增加了產品開發(fā)成本，但是可以改進產品設計質量，提高面向客戶與市場需求能力。（ ）二、單選題1 以下產品屬于機電一體化產品的是（ ）。a游標卡尺 b電話c全自動洗衣機 d非指針式電子表2為提高機電一體化機械傳動系統(tǒng)的固有頻率，應設法（ ）。 a增大系統(tǒng)剛度 b增大系統(tǒng)轉動慣量c增大系統(tǒng)的驅動力矩 d減小系統(tǒng)的摩擦阻力3導程l0=8mm的絲杠驅動總質量為60kg的工作臺與工件，則其折算到絲杠上的等效轉動慣量為（ ）kgmm2。 a48.5 b97c4.85 d9.74傳

4、動系統(tǒng)的固有頻率對傳動精度有影響，（ ）固有頻率可減小系統(tǒng)地傳動誤差，（ ）系統(tǒng)剛度可提高固有頻率。a提高，提高 b提高，減小c減小，提高 d減小，減小5下列哪種方法是采用單螺母預緊原理來消除滾珠絲杠副的間隙？（ ） a螺紋調隙式 b雙螺母墊片調隙式c齒差調隙式 d偏置導程法6. 齒輪傳動的總等效慣量隨傳動級數(shù)( )。 a.增加而減小 b.增加而增加c.減小而減小 d.變化而不變7多級齒輪傳動中，各級傳動比“前小后大”的分配原則不適用于按（ ）設計的傳動鏈。 a最小等效轉動慣量原則（小功率傳動裝置）b最小等效轉動慣量原則（大功率傳動裝置）c輸出軸的轉角誤差最小原則d重量最輕原則8某機電一體化系

5、統(tǒng)需要消除齒輪傳動的齒側間隙，采取下列哪種方法使得調整過程中能自動補償齒側間隙？（ ） a偏心套調整法 b軸向墊片調整法c薄片錯齒調整法 d軸向壓簧錯齒調整法三、簡答題1完善的機電一體化系統(tǒng)主要包括哪幾部分？答：機械本體、動力系統(tǒng)、檢測傳感系統(tǒng)、執(zhí)行部件和信息處理及控制系統(tǒng)五部分相互協(xié)調，共同完成所規(guī)定的目的功能。通過接口及相應軟件有機結合在一起，構成內部匹配合理、外部效能最佳的完整產品。2簡述機電一體化系統(tǒng)中的接口的作用。3機械運動中的摩擦和阻尼會降低效率，但是設計中要適當選擇其參數(shù)，而不是越小越好。為什么？4簡述機械系統(tǒng)的剛度對系統(tǒng)動態(tài)特性的影響。四、計算題1.某工作臺采用直流電機絲杠螺母

6、機構驅動如圖所示，已知電機軸的轉動慣量jm=410-4kgm32，與電機輸出軸相連的小齒輪的轉動慣量j1=110-4kgm32，大齒輪的轉動慣量j2=1.810-4kgm32，絲杠的轉動慣量js=3.810-4kgm32。工作臺的質量m=50kg，絲杠導程t=5mm，齒輪減速比為i=5。試求：（1）工作臺折算到絲杠的等效轉動慣量jg；（2）傳動件折算到電機軸的等效轉動慣量je；（3）電機軸上的總轉動慣量j。工作臺絲杠 滾珠螺母齒輪減速器聯(lián)軸器dc伺服電機i=5圖 直流電機絲杠螺母機構驅動工作臺2.已知某四級齒輪傳動系統(tǒng)，各齒輪的轉角誤差為1=2=8=0.01弧度，各級減速比相同，即i1 = i

7、2 = i4 =3，求該系統(tǒng)的最大轉角誤差max。五、綜合題1. 分析下圖調整齒側間隙的原理。1. 鎖緊螺母 2. 圓螺母 3. 帶凸緣螺母 4.無凸緣螺母2.分析下圖中傳動大負載時消除齒側間隙的原理。1、6小齒輪 2、5大齒輪 3齒輪 4預載裝置 7齒條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

8、 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 f

9、or 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 discrimi

10、nation.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 associati

11、ons 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.uef

12、a 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 c

13、omplaint. 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 v

14、ery 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/8.8

15、5 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 the

17、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 air

18、 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 parachute th