Q/SZJ191001-2017車燈（車身）模態(tài)分析規(guī)范SpecificationOfModeAnalysisForHeadlamp(Vehicle)20XX20XX-09-30實(shí)施20XX-08-28發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017車燈（車身）模態(tài)分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了車燈（車身）模態(tài)分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門車燈（車身）模態(tài)分析。規(guī)范性引用文件無。術(shù)語和定義無。摘要ABSTRACT本分析規(guī)范的目的是為了確定整車狀態(tài)下車燈第一階模態(tài)。Thepurposeofthisanalysisistodeterminethe1stnaturalfrequencyfortheheadlamp.流程圖ProcessFlowDiagram建模建模Model1stmode>35Hz確定安裝點(diǎn)fixedpoint約束邊界Boundary設(shè)置參數(shù)計(jì)算Setparameter結(jié)束End優(yōu)化Optimization圖1流程圖Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析過程中需要用到的如下軟件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前處理(Preprocessors):Hypermesh求解器(AnalysisCode):MSC.Nastran后處理(Postprocessors):Hyperview建模和分析過程Modeling/AnalysisProcedure單位Units分析中所用單位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) 牛頓(N)質(zhì)量(Mass) 噸(Ton)長度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents無坐標(biāo)系CoordinateSystems整車全局坐標(biāo)系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniques整車或半車身模型，其中包含車燈燈殼，燈片，集中質(zhì)量點(diǎn)以及燈內(nèi)部關(guān)鍵的零部件。Toafullorhalfvehiclemodel;Includelamphousing,lens,remaininglampmass,andwherenecessarysignificantlampinternals.假設(shè)和限制Assumptions/Limitations無載荷和邊界條件Loads/BoundaryConditions約束Constrains：X向從A柱后面截取車身模型，Y向從原點(diǎn)處截取半車身模型，其中X向截取車身節(jié)點(diǎn)處約束1-3DOF，Y向截取半車身節(jié)點(diǎn)處約束2,4,6DOF；與燈相連接零部件連接點(diǎn)用RBE2模擬，約束1-3DOF；與車身相連的連接點(diǎn)用RBE2模擬，約束1-3DOF；車燈用CONM2單元模擬包含轉(zhuǎn)動(dòng)慣量信息，車燈質(zhì)量在質(zhì)心處用RBE3連接到車燈殼上。MultiplenodesSPC’s1-3wherebodyiscutbehindApillar;MultiplenodesSPC’s2,4,6wherebodycutatcenterline;Theattachmentpointsareassumedtoberigid(RBE21-3)connectionsbetweencomponentswithinthelampassembly;Attachmentstothebodystructureareassumedtoberigid(RBE21-3)connections;ThemassoftheheadlampshouldberepresentedusingaCONM2massattheCGofthelampwiththeappropriatemomentofinertiavaluesinthemasscard.ThemassisdistributedwithaRBE31-6atCGtothehousingRBE31-3.加載Loads：SOL103ModeSol103圖2邊界約束Fig2Boundarycondition結(jié)果Results無性能要求PerformanceRequirements車燈一階模態(tài)大于35Hz。1stheadlampresonantfr