Q/SZJ191001-2017格柵（車身）模態(tài)分析規(guī)范SpecificationOfModeAnalysisForGrill(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格柵（車身）模態(tài)分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了格柵（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部門格柵（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)下格柵第一階模態(tài)。Firstgrillenaturalresonantfrequency(1stmode)invehicle:Toassessthestiffnessofgrilleatvehiclelevelandevaluatethelikelihoodofgrillehavingresonancewithvehiclebodymodes.流程圖ProcessFlowDiagram建模建模Model1stmode>30Hz確定安裝點(diǎn)fixedpoint約束邊界Boundary設(shè)置參數(shù)計算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本分析模型采用整車模型。Fullvehiclemodelisusedinthisanalysis.假設(shè)和限制Assumptions/Limitations無載荷和邊界條件Loads/BoundaryConditions約束Constrains：車身前后彈簧安裝點(diǎn)處約束，約束1-6DOFMountinglocationsSPC’d1-6forVehicle.加載Loads：SOL103ModeSol103圖2邊界約束Fig2Boundarycondition結(jié)果Results無。性能要求PerformanceRequirements主要一階模態(tài)大于30Hz。Majormodesarelargerthan30Hz.分析要求ANALYSISREQUIREMENTS列出格柵系統(tǒng)的呼吸，彎曲，扭轉(zhuǎn)模態(tài)，并評估格柵在整車系統(tǒng)的模態(tài)。Toassessthemajormodes(breathing,twist,up/down)ofgrilleatassemblylevelandevaluatethelikelihoodofgrillehavingr