Q/SZJ191001-2017格柵（系統(tǒng)）模態(tài)分析規(guī)范SpecificationOfModeAnalysisForGrill(Component)20XX20XX-09-30實(shí)施20XX-08-28發(fā)布XXXX汽車(chē)工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017格柵（系統(tǒng)）模態(tài)分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了格柵（系統(tǒng)）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(mén)格柵（系統(tǒng)）模態(tài)分析。規(guī)范性引用文件無(wú)。術(shù)語(yǔ)和定義無(wú)。摘要ABSTRACT本分析規(guī)范的目的是為了確定格柵模態(tài)表。Thepurposeofthisanalysisistodeterminethetableofnaturalfrequencyforthegrill.流程圖ProcessFlowDiagram建模建模Model1stmode>45Hz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(guò)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(guò)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(zhǎng)度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents無(wú)坐標(biāo)系CoordinateSystems整車(chē)全局坐標(biāo)系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniques本分析格柵系統(tǒng)模型包含側(cè)邊和中間支架，約束點(diǎn)位于格柵側(cè)支架和重建支架與車(chē)身連接點(diǎn)。如果支架安裝在比較弱的零部件上，該零部件也需要一起分析。Grilleassembly(includingsideandcenterbracket)isusedintheanalysis.Theboundaryconstraintsaredefinedattheattachmentbetweenrigidvehiclebodyandcenterandsidebrackets.However,ifthesebracketsareattachedtosomecomponentswhichcannotbetreatedasrigidbody,thesecomponentshavetobeincludedintothemodelbeinganalyzed.假設(shè)和限制Assumptions/Limitations無(wú)。載荷和邊界條件Loads/BoundaryConditions約束Constrains：約束格柵系統(tǒng)安裝點(diǎn)，約束1-6DOF，分析1G工況下的格柵；車(chē)身和格柵的連接點(diǎn)認(rèn)為是剛性連接MountinglocationsSPC’d1-6forgrilleassembly;Analyzethegravityloadperformanceofgrille.Useconsistentunits.Theattachmentpointsareassumedtoberigidconnectionsbetweenrigidvehiclebodyandgrilleassembly.It’slefttouserdiscretiontoincludewhatcomponentsintogrilleassemblyotherthangrilleitself.加載Loads：SOL103ModeSol103圖2邊界約束Fig2Boundarycondition結(jié)果Results無(wú)性能要求PerformanceRequirements主要一階模態(tài)大于45Hz。Majormod