摩托車(chē)發(fā)動(dòng)機(jī)安裝方式對(duì)車(chē)架特性的影響研究.pdf

1、天津大學(xué)碩士學(xué)位論文摩托車(chē)發(fā)動(dòng)機(jī)安裝方式對(duì)車(chē)架特性的影響研究姓名：朱躍虎申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：車(chē)輛工程指導(dǎo)教師：畢鳳榮20070601ABSTRACTThemotorcycleframeisthemainpartofthemotorcycleFrames仃ucturedirectlyaffectsthefunctions，suchascomfortandsafetyEngineisanotherkeycomponentofthemot

2、orcycleWeneedtOstudythechangeoftheframecharacteristicswhentheengineisaddedtoframeindifferentways，becausethisisveryimportanttodecidethereasonablewayandlocationfortheengineInthispaperathreedimensionalmodelisfirstlysetupbyu

3、singtheUGsoftwareThismodelisintroducingintotheMSCPATRANandIchoosetobuildthesolidfiniteelementmodeloftheframeAfterwegetthemodel，wecarryoutthemodelanalysisonitandabstractthefirst10modethatagenotthebodymodeInordertoverifyth

4、eaccuracyofthemodel，wealsocarryoutexperimentanalysisoftheframeAftercomparingthetwesults，wefindtheerrorisunder5％ThismeansthatthemodelisaccurateenoughandCanbeused。ItisveryimportanttOanalyzethechangeofthecharacteristicsofth

5、eframeafteraddingtheengineInthispapertwOconditionsareresearched：combiningthetwOcomponentsbyjointsandelasticsuspensionUnderthefirstcondition，thenaturalfrequenciesincrease；underthesecondcondition，thenaturalfrequenciesdecre

6、asesharplyThefrequencyofthefirstconditionis；：largerthanthesecondoneUnderthesecondcondition，thestressoftheframeissmallerandthestrengthoftheframeissafer；thestiffnessincreasesUnderthesecondcondition，wealsostudytheeffectsoft

7、heengineindifferentlocationsmountingonthefamecharacteristicsAfterchangingthelocation，thevibrationmodelchanges，thefrequencydecreases；thestressontheframebecomessmaller，thestrengthoftheframeincreases，butthestiffnessdecrease