微型汽車起步抖動探討.pdf

1、武漢理工大學(xué)碩士學(xué)位論文微型汽車起步抖動探討姓名：周然杰申請學(xué)位級別：碩士專業(yè)：機(jī)械制造及其自動化指導(dǎo)教師：莫易敏20091101AbstractThejudderduringstartingtakesasmallproportionofthebreakdownofthemini—vehicle，butitisstillaproblemthatCallnotbeignoredThisthesisisentrustedbyaenterpr

2、isetesearchthereasonwhichleadtothejudderofthemiIlivellicleduringstartingonthepremisethat(1)themanufactureandinstallationofallthecomponentsoftheminivehiclemeettherequirements(2)thereisnobreakagetothecomponentthemini—vehic

3、le(3)thereisnomisoperation(4)theminivehicleisproperlymaintainedInEngineering，resonanceoccurswhenthefrequencyoftheimpetusapproachthefrequencyoftheundampednaturalfrequencyofthesystemUndampednaturalfrequencyofeachorderofthe

4、minivehicle’SdrivesystemWasgoRenbytheanalysisonthevibrationmodelofthemini—vehicle’SdrivesystemTheresultshowsthatthenaturalfrequencyoftheengineisbeyondtheresonanceregionoftheminivehicle，sdrivesystemSesonanceisnotthecauseo

5、fthejudderoftheminivehicleduringstartingTherewouldbejudderifthefrictiontorquetransmittedbytheclutchoftheminivehicleischangefulduringstartingOneofthemostimportantcausesthatleadstothechangefulfrictiontorqueisthechangefulfr

6、ictioncoefficientTheresultsofthetestoffrictionalbehaviorshowthattherelativeslidingvelocity，theworkingload，theambienttemperatureandtheheatoffrictionallaffectthefrictioncoefficientoftheminivehicle’sclutch(1)Thefrictioncoef

7、ficientfirstlydecreasesrapidlythendecreasesslightlyasrelativeslidingvelocityincreases；(2)Thefrictioncoefficientdecreasesrapidly，thendecreasesslowly，finallystabilizedastheworkingloadincreases(3)Thefrictioncoefficientfirst

8、lystabilized，thendecreasesslowlyastheambienttemperaturedecreases(4)Thefrictioncoe簡cientfirstlystabilizedthendecreasessli曲tly，thenincreasesli曲tly，andfinallydecreasesfastasthetemperatureofthefrictionsurfaceincreasesTherela

9、tiveslidingvelocitytheworkingload，theambienttemperatureandthetemperatureofthefrictionsurfaceoftheclutchchangeduringtheminivehicleisstartingUnderthecombinedeffectsoftheambienttemperature，therelativeslidingvelocitytheworki