›› 2012, Vol. 32 ›› Issue (5): 21-26.doi: 10.3780/j.issn.1000-758X.2012.05.004

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DynamicsInfluenceFactorsAnalysisonTwo-axis-positionMechanismofSatelliteAntennaswithJointClearance

 PAN  Dong, WANG  Xing-Gui, ZHAO  Yang   

  1. (DepartmentofAstronautics,HarbinInstituteofTechnology,Harbin150001)
  • Received:2011-10-11 Revised:2012-03-23 Online:2012-10-25 Published:2012-10-25

Abstract: iththehighdemandforpointingaccuracyofthesatelliteantenna,thejointclearanceisinevitableduetotheexistenceofthekinematicpairinthetwoaxispositionmechanism.Soitisparticularlyimportanttostudytheinfluenceofthejointclearancetosatelliteantennamechanism.Thetwoaxispositionmechanismwastakenasresearchobject,thecontact dynamicsmodeloftheclearancejointwasestablishedbyapplyingthenonlinearspringdampmodel,andthefrictioneffectwasconsideredbyapplyingtheCoulombfrictionmodel.Thelawthatthedynamiccharacteristicoftwoaxisposition mechanismaffectedbythefactorswasanalyzedbythedynamicsimulationofthevirtualprototype,suchasthesizeofthejointclearanceandthedrivingtorqueintheclearance.Theresultsshowthatlargejointclearanceanddrivingtorquewillreducethepositioningaccuracyandmakethesystemunstable.Itisagoodwaytoincreasethepositioningaccuracythroughoptimizingthestructureofthesatelliteantennamechanism.

Key words: Two axis position mechanism, Joint clearance, Virtual prototype, Dynamic characteristics, Influence rule, Pointing accuracy, Satellite antenna