haccelerationinthex-directionisappliedtoovercomethepreloadonspring,theballdisplacesthespring.Astheaccelerationappliedcontinuestoincrease,springisdisplaceduntilitisincontactwithspring.OnceFigure.Electro-mechanicalautomobilecrashsensor.contactismadebetweenspringandspring,anelectriccircuitiscompletedallowingthesensortoperformitsfunctionwithintheairbagsystem.FINITEELEMENTANALYSISMETHODOLOGYWhencreatingafiniteelementrepresentationofthesensor,thefollowingsimplificationscanbemade.Thetwospringscanbefullyrestrainedattheirbasesimplyingaperfectlyrigidplastichousing.Thisisagoodassumptionwhencomparingtheflexibilityofthethinspringstothestiffplastichousing.Theballcanberepresentedbyarigidsurfacesinceittooisverystiffascomparedtothesprings.Ratherthanmodelingthecontactbetweentheplastichousingandtheball,allrotationsandtranslationsar。
如果加速度继续增加,弹簧