with Worst Case Joint Clearances最差情况下接头间隙

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1、EngineeringLetters,20:2,EL_20_2_04______________________________________________________________________________________DesigningFour-barLinkagesforPathGenerationwithWorstCaseJointClearancesSamerK.Mutawe,YahiaM.Al-Smadi,RajpalS.SodhiAbstract—Thecalculationofmechanismparametersrequirede

2、xamplesoffactorsattributingtothesetolerances.Theeffecttoachieveorapproximateasetofprescribedrigid-bodypathoftherequiredjointassemblytolerancesonthefour-barpointsisdeterminedbytheuseofFour-barpathgeneration.Thismechanismsynthesisisstudied.workwilldiscusstheuseofpathgenerationwhileconsid

3、eringtheManymethodsandanalyseshavebeenconsideredtopositiontoleranceresultingfromjointrunningclearance.Notincludeerrorcausedbyjointclearancesandlinkgeometryonlywillthisworkdiscusstheuseofpathgenerationoffour-bartolerancesinthemechanismsynthesis.Graphicalandmechanisminitsfamiliarform,itw

4、illincludepositiontoleranceasaresultofjointrunningclearance.ThestandardsofAmericanmathematicalapproachestoinvestigatetheefficiencyofNationalStandardInstitute(ANSI)willbeappliedinthisstudy.planarmechanismstoapproximatethecouplerposesThispaperwillimplementthejointtolerancesintotheconside

5、ringtheerrors/tolerancesinmechanismlinkageswereconventionalplanarfour-barpathgenerationmodeldevelopedby[2]and[3].Recentcontributionsperformedbydisplacementmatrixasadesignconstraint.Thissynthesiswill[4],[5]and[6]modeledthejointclearanceasamasslessproduceaplanarfour-barmechanismwithmovin

6、gpivotsandvirtuallink(clearancelink)andinvestigatedthejointlengthtolerancelimitsfromwhichanymechanismcanbecreatedclearanceeffectonthemechanismperformancetoachievethetotravelthroughouttheprescribedpathforacouplerpointwithprescribedcouplercurves/points.Amethodtopredicttheitsspecifiedtole

7、rance.Anexampletodemonstratethesynthesis1limitsofthetoleranceregionbychoosingtheclearancevalueofafour-barmechanismwithjointtolerancesisincluded.wasalsoproposedby[6].IndexTerms—Pathgeneration,jointtolerances,worstcaseα12PP22tolerance,mechanismtoleranceα11P11aa1PP33I.INTRODUCTION