电工与电子技术基础第三章习题答案

不排除由于是进行产品质量评审时,在项目的设置、抽样方法与质量检验的严谨程度上,都尚存在一定的问题；所以产品评审的过程需要进一步改进；以便更真实地反映情况出产品的真实问题；从而更全面、更本质地反映产品质量存在的问题与真实水平centerpinchecksandanchoringtheinnercylinder.AccordingtoWhilecouplingalignmentshouldkeepoiloutofcavityandlocatetherotoraxisneckraisedarewithintheprescribedlimits,thereshouldbenogaps,Horn,HornandHorn0.05mmfeelergaugesfitinto.Centercoupling,condenserwaterfillingandwater-filledaccordingtofactoryrequirement.ForcouplingthreesupportedrotorCenter,themouthunderthecouplingbetweenthevalueshouldbeasstipulatedinthemanufacturer,usually0.15~0.25mm.Inthecaseofcouplingconnection,ifpossible,liftingonlyonebearingendofthesupportbearingoftherotor,removethebearing,fittedwithspecialtilesandspecialliftingtools,discrotors,checkthejournalfluttertile,shouldgenerallybelessthan0.10MM.Whenthecouplingsandrotorcomeswhenthereisaconflict,thecouplingCentreshallprevail.6.4.5.2.2shaftlookingfor:...6.4.5.3.Provisionalboltconfirmedthepositioningoftherotorsize,aswellasthecouplingbetweentheadjustmentshimthicknessaccuracy,drawingstomeetthetechnicalrequirements.Plane,cylindricalandcleanthecouplingboltholesshouldbecleanandwithoutburrs,scrapironandgrease-free,relativepositionofthecouplingaccordingtothedrawingrequirementsare.Couplingtopscrews,rounddistanceapart,indicatorstomonitormovementoftheaircraft,itsvalueisallowedtopassthevalueaxismoving,mountedadjustmentpads,notepadsinstallationdirectionguidepincouplingwithprocessendclosed.Thebackwheelsslowlytightened,when2mmorso,withstandardwhitebarswheretwobackwheelboltholemeasurementaboveandbelow,confirmtwobackwheelboltholeconcentricity.Then,thesymmetricalhorizontalmounttwotemporaryboltstightened,attentiontomonitordialindicator,theninstallthesymmetricaltemporarybolts,thistimesitesslowlymovingrotor,inthemeasuredcircumferenceof8equalpartsbackwheelrimrock,eachmeasuringrelativechangesinvalueshouldbelessthan0.02mm.6.4.5.4couplingreamedandpairedboltreamingdiereamer,adjustablereamers,boringmill,inseveralways.6.4.5.4.1Generalrequirementsbeforereamingorboring,第3章电路的暂态过程一、思考题解答3.1思考题【思3.1.1】电路在换路前储能元件没有储能，则在t＝0－和t＝0＋的电路中，可将电容元件视为短路，电感元件视为开路。如果换路前储能元件已有储能，且电路已处于稳态，则在t＝0－电路中，电容元件视为开路，电感元件视为短路。在t＝0＋电路中，电容元件可用一理想电压源代替，其电压为uC(0－)；电感元件可用一理想电流源代替，其电流为iL(0－)。【思3.1.2】根据换路定律可知，开关S断开瞬间电容器的电压值不能突变，则在t＝0＋时的等效电路可简化为如图3-2所示的电路。uC(0＋)＝uC(0－)＝112×6＝2V，i2(0＋)＝0，i1(0＋)＝iC(0＋)＝622＝2A【思3.1.3】根据换路定律可知，开关S断开瞬间电感的电流值不能突变，则在t＝0＋时的等效电路可简化为如图3-3所示的电路。iL(0＋)＝iL(0－)＝42＝2A，UV＝RV×iL(0＋)＝－2500×2＝－5kV图3-2思考题3.1.2的0＋电路图图3-3思考题3.1.3的0＋电路图【思3.1.4】根据换路定律可知，开关S闭合瞬间电容器的电压值不能突变，则在t＝0＋时的等效电路可简化为如图3-4(a)所示的电路。(1)i1(0＋)＝0，i(0＋)＝i2(0＋)＝100AuR1(0＋)＝100×1＝100V，uR2(0＋)＝uC(0＋)＝0第3章电路的暂态过程•1•不排除由于是进行产品质量评审时,在项目的设置、抽样方法与质量检验的严谨程度上,都尚存在一定的问题；所以产品评审的过程需要进一步改进；以便更真实地反映情况出产品的真实问题；从而更全面、更本质地反映产品质量存在的问题与真实水平centerpinchecksandanchoringtheinnercylinder.AccordingtoWhilecouplingalignmentshouldkeepoiloutofcavityandlocatetherotoraxisneckraisedarewithintheprescribedlimits,thereshouldbenogaps,Horn,HornandHorn0.05mmfeelergaugesfitinto.Centercoupling,condenserwaterfillingandwater-filledaccordingtofactoryrequirement.ForcouplingthreesupportedrotorCenter,themouthunderthecouplingbetweenthevalueshouldbeasstipulatedinthemanufacturer,usually0.15~0.25mm.Inthecaseofcouplingconnection,ifpossible,liftingonlyonebearingendofthesupportbearingoftherotor,removethebearing,fittedwithspecialtilesandspecialliftingtools,discrotors,checkthejournalfluttertile,shouldgenerallybelessthan0.10MM.Whenthecouplingsandrotorcomeswhenthereisaconflict,thecouplingCentreshallprevail.6.4.5.2.2shaftlookingfor:...6.4.5.3.Provisionalboltconfirmedthepositioningoftherotorsize,aswellasthecouplingbetweentheadjustmentshimthicknessaccuracy,drawingstomeetthetechnicalrequirements.Plane,cylindricalandcleanthecouplingboltholesshouldbecleanandwithoutburrs,scrapironandgrease-free,relativepositionofthecouplingaccordingtothedrawingrequirementsare.Couplingtopscrews,rounddistanceapart,indicatorstomonitormovementoftheaircraft,itsvalueisallowedtopassthevalueaxismoving,mountedadjustmentpads,notepadsinstallationdirectionguidepincouplingwithprocessendclosed.Thebackwheelsslowlytightened,when2mmorso,withstandardwhitebarswheretwobackwheelboltholemeasurementaboveandbelow,confirmtwobackwheelboltholeconcentricity.Then,thesymmetricalhorizontalmounttwotemporaryboltstightened,attentiontomonitordialindicator,theninstallthesymmetricaltemporarybolts,thistimesitesslowlymovingrotor,inthemeasuredcircumferenceof8equalpartsbackwheelrimrock,eachmeasuringrelativechangesinvalueshouldbelessthan0.02mm.6.4.5.4couplingreamedandpairedboltreamingdiereamer,adjustablereamers,boringmill,inseveralways.6.4.5.4.1Generalrequirementsbeforereamingorboring,1(2)i(∞)＝i1(∞)＝100199＋＝1A，i2(∞)＝0uR1(∞)＝1×1＝1V，uR2(∞)＝uC(∞)＝99×1＝99V(3)根据换路定律可知，当S闭合瞬间电感的电流值不能突变，则在t＝0＋时的等效电路可简化为如图3-4(b)所示的电路。i2(0＋)＝0，i(0＋)＝i1(0＋)＝100199＋＝1AuR1(0＋)＝1×1＝1V，uR2(∞)＝uL(0＋)＝99×1＝99VS闭合后电路达到稳态时，i1(∞)＝0，i(∞)＝i2(∞)＝1001＝100AuR1(∞)＝100×1＝100V，uR2(∞)＝uC(∞)＝0(a)(b)图3-4思考题3.1.4的0＋电路图【思3.1.5】iL(0＋)＝iL(0－)＝013ERRR＝12222＝2AuC(0＋)＝uC(0－)＝2×2＝4Vt＝0＋时的等效电路如图3-5所示，可得12＝2×［2＋iC(0＋)］＋2×iC(0＋)＋4所以，iC(0＋)＝124422＝1