›› 2016, Vol. 36 ›› Issue (3): 41-49.doi: 10.3780/j.issn.1000-758X.2016.0020

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Dynamicsanalysisoflineararraydeployablestructurebasedonscissor-likeelementconsideringjointclearance

 LI  Bo, WANG  San-Min*, YUAN  Ru, ZHI  Chang-Jian   

  1. SchoolofMechanicalEngineering,NorthwesternPolytechnicalUniversity,Xi′an710072,China
  • Received:2015-09-01 Revised:2015-10-08 Online:2016-06-25 Published:2016-02-24

Abstract: Inordertopreciselyresearchthedynamicsperformanceofadeployablestructurebasedonascissor-likeelement,clearanceswereintroducedintooneofalljointsinthescissor-likeelementsothatitwasclosedtotherealmechanism.Thekinematicmodeloftherevolutejointwithclearancewasestablishedbytheprincipleofthemotionbetweenjointelements.ThenormalandtangentialcontactforcesbetweenjointelementsweredescribedbyaGonthiercontactforcemodelandacorrectionalCoulombfrictionmodel.Thecontactforcesbetweenthebearingandthejournalwereconvertedtothemasscentersoflinkandthesliderconnectedbythisclearancejoint.Theconvertedcontactforceandtheadditionaltorquewereintegratedtoageneralizedforceinmotionequationsofthedeployablestructure,andthentheeffectofjointclearancewasintroducedtothescissor-likeelement.Adirectdefaultcorrectionmethodwasusedtodirectlymodifythecoordinatesandspeedsofthesystemtoavoidthenumericalresultsdivergence.Also,thismethodcancontrolthedefaultwithinagivenrangeofaccuracy.Theinfluenceofrevolutejointclearanceonthedynamicperformanceofthelineararraydeployablestructurewaspredictedbymeansofnumericalanalysis,providingareferenceandbasisforthestudyofthemotionaccuracyandmechanismdesignofdeployablestructures.Furthermore,thesimulationresultsextendtheapplicationrangeoftheclearancecollisionmodel,whichishelpfulforengineeringapplications.

Key words: deployablestructure, jointclearance, Gonthiercontactmodel, directdefaultcorrection, dynamicscharacteristic