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支撑面转动时弹簧的刚度特性分析.docx

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支撑面转动时弹簧的刚度特性分析 Introduction Whenasupportingsurfacerotates,thestiffnesscharacteristicsofthespringcanhaveasignificantimpactontheperformanceofthesystem.Inthispaper,wewillanalyzethedifferenttypesofspringsusedinsupportingsurfacerotationandhowtheirstiffnesscharacteristicsaffecttheoverallperformance. TypesofSprings Themostcommontypeofspringusedinsupportingsurfacerotationisthecoilspring.Coilspringshaveahelicalshapethatprovidesradialsupportaroundtheaxisofrotation.Thistypeofspringhasahighstiffnessrateandiscapableofbearinghighloads.However,itsradialstiffnesscharacteristicsarenotalwaysconsistent,anditsperformancecanbeaffectedbyfactorssuchaswirediameter,coilpitch,andnumberofturns. Anothertypeofspringusedinsupportingsurfacerotationisthetorsionspring.Torsionspringshaveahelicalshapethatprovidestorsionalsupportaroundtheaxisofrotation.Thistypeofspringhasalowerstiffnessratethanthecoilspringbutcanprovideaconstanttorsionalforceacrosstherotationrange.Torsionspringsarecommonlyusedinassembliesthatrequireaconstanttorque,suchasdoorhinges. Theleafspringisanothertypeofspringusedinsupportingsurfacerotation.Leafspringsconsistofaseriesofflat,curved,orsemi-ellipticalplatesthatarestackedtogether.Thistypeofspringprovideslongitudinalstiffnessthatiscapableofresistingabendingmoment.Leafspringsarecommonlyusedinvehiclesuspensions,butduetotheirhighfriction,theyarenotsuitableforhigh-speedrotationapplications. StiffnessCharacteristics Thestiffnesscharacteristicsofaspringareimportantindeterminingtheoverallperformanceofthesupportingsurfacerotationsystem.Herearethethreeprimarystiffnesscharacteristicsofsprings: 1.StiffnessRate–Thisistheamountofforcerequiredtocompressortwistthespringbyacertaindistance.Stiffnessrateisdeterminedbythematerial,geometry,andnumberofturnsofthespring. 2.Damping–Thisistheforcethatopposesthemotionofthespring.Dampingisdeterminedbythematerialandgeometryofthespring. 3.ResonantFrequency–Thisisthefrequencyatwhichthespringnaturallyoscillateswhenitisdisturbed.Resonantfrequencyisdeterminedbythem