Q/SZJ191001-2017懸置靜態(tài)安裝力計(jì)算分析規(guī)范SpecificationofCalculationforStaticMountForces20XX20XX-12-31實(shí)施20XX-11-27發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017懸置靜態(tài)安裝力計(jì)算分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了懸置靜態(tài)安裝力計(jì)算分析的方法。本標(biāo)準(zhǔn)適用于CAE部門懸置靜態(tài)安裝力計(jì)算分析。規(guī)范性引用文件無。術(shù)語和定義無。摘要Abstract在總裝過程中，發(fā)動(dòng)機(jī)首先是安裝左右懸置兩個(gè)點(diǎn)，而前后懸置點(diǎn)是自由釋放的。這種狀態(tài)下，發(fā)動(dòng)機(jī)自重會(huì)導(dǎo)致左右懸置產(chǎn)生彈性變形，更重要的是由于不平衡會(huì)導(dǎo)致發(fā)動(dòng)機(jī)向前或向后翻轉(zhuǎn)。由于總裝時(shí)這種情況的發(fā)生，就需要計(jì)算此狀態(tài)下的發(fā)動(dòng)機(jī)位置和相應(yīng)的安裝點(diǎn)力。如果在第三個(gè)懸置點(diǎn)預(yù)加載，也可以計(jì)算得到在這些零件接地連接時(shí)，需要加載多大的扭矩。Duringthefinalassemblytheengineisfirstsetonbothlateralenginemountswhilefrontandrearmountarestillleftfree.Theweightoftheenginewillcausesomeelasticdeformation.Itisimportanttoknowforreasonsofequilibriumifbothlateralmountstakemoreorlessthesamepartoftheweightloadandiftheenginewillrollforwardorbackward.Forthisreason,thefinalpositionoftheengineandthemountforcesarecalculatedunderstaticweightload.Ifdesiredthepreloadofathirdenginemountrespectivelyoneormoretorquestructscanbedeterminedinasecondrunwiththesecomponentsconnectedtothegroundtoo.流程圖無。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):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整車坐標(biāo)系Globalcoordinatesystem建模技巧ModelingTechniques建模需要如下信息：動(dòng)力總成的慣性矩與質(zhì)量大??；質(zhì)心位置；懸置安裝點(diǎn)位置；懸置襯套剛度；動(dòng)力總成被設(shè)定為剛體，用剛性單元(RBE2)將質(zhì)心與懸置安裝點(diǎn)直接連接，而懸置襯套被設(shè)定為彈性單元，一端接地。Thefollowinginputdataarerequiredandmustbegivenbytheuser:Themassandthemomentsofinertiaoftheengine/motoraswellasthetransformationbetweentheprincipalinertiaaxisandthevehiclecoordinatesystemThepositionofthecenterofgravityThepositionoftheenginemountsThestiffnessofthespringsrepresentingthemountsSincetheengineissupposedtobeverystiffthedifferentmountpositionsareconnectedbyrigidelementstothecenterofgravity.Theenginemountsarerepresentedbysprings.Thelateralspringsareconnectedtotheground.圖1動(dòng)力總成模型假設(shè)和限制Assumptions/Limitations本規(guī)范僅用于靜態(tài)線性分析。Thismodelingandanalysistechniqueassumesarigid,linearsystem.載荷和邊界條件Loads/BoundaryConditions約束左右兩側(cè)的懸置安裝點(diǎn)需要接地連接，其它懸置安裝點(diǎn)自由釋放，這樣發(fā)動(dòng)機(jī)將自己尋找平衡位置。另外還要加上一根彈簧或約束來限制繞質(zhì)心位置Y軸旋轉(zhuǎn)，因?yàn)樽笥覒抑弥患s束了平動(dòng)。不加彈簧或約束的原系統(tǒng)還有一個(gè)自由度，會(huì)導(dǎo)致分析出錯(cuò)。彈簧或約束會(huì)顯示發(fā)動(dòng)機(jī)是向前旋轉(zhuǎn)還是向后旋轉(zhuǎn)。如果希望加上第三個(gè)懸置安裝點(diǎn)，則在第二次分析中就將這三個(gè)懸置安裝點(diǎn)接地。Thelateralenginemountsareconnectedtothegroundandtheothersareleftfreesothattheenginewillfinditsownequilibriumposition.Additionally,arotatoryspringorconstraintshouldbeusedtoreducethey-rotationofthecenterofgravitybecausethelateralmountshaveonlytranslationalstiffness.Theoriginalstiffnessmatrixofthesystemisthussingularandmaycauseproblemsinstaticanalysis.Theelementforceofthisspringorconstraintwillindicateiftheenginerollsforwardorbackward.Ifdesiredthepreloadofathirdenginemountrespectivelyoneormoretorquestrutscanbedeterminedinasecondrunwiththesecomponentsconnectedtothegroundtoo.載荷直接加載重力加速度或換算成相應(yīng)力加載到發(fā)動(dòng)機(jī)質(zhì)心上去。Gravityorastaticforceinverticaldirectionconsistingofthetotalmassmultipliedbythegravityaccelerationatthecenterofgravityisused.結(jié)果Results結(jié)果格式ResultsFormats在Nastran/Optistruct輸出的PCH結(jié)果文件中包含了位移，單元力和約束力。下面的例子中左右懸置（單元31001和單元31002）的單元力和位移幾乎一樣。質(zhì)心751的負(fù)約束力表明發(fā)動(dòng)機(jī)沿著-Y旋轉(zhuǎn)。Theresults,displacements,elementforcesandconstraintforces,maybefounddirectlyinthepunchfileoftheNastran/Optistructcalculation.Inthefollowingexampletheelementforcesand/ordisplacementofthelateralmounts(e.g.elements31001and31002)shouldhavealmostthesamevalue.Thenegativeconstraintforceofcenterofgravitynode751indicatesthattheenginewillrotateinpositivey-direction.PCH文件例子：ExamplePunchfile:$TITLE=XXX$SUBTITLE=STATICMOUNTFORCES$LABEL=$DISPLACEMENTS$REALOUTPUT$SUBCASEID=1751G8.874615E-05-1.732700E-02-6.204299E+00-CONT--1.127955E-040.000000E+001.194141E-06G6.552747E-04-8.444068E-03-6.150787E+00-CONT--1.127955E-040.000000E+001.194141E-06G-4.680534E-042.111017E-03-6.256893E+00-CONT--1.127955E-040.000000E+001.194141E-06G2.735677E-04-4.337965E-02-6.186842E+00-CONT--1.127955E-040.000000E+001.194141E-06G1.613184E-04-4.679531E-02-6.197444E+00-CONT--1.127955E-040.000000E+001.194141E-06G0.000000E+000.000000E+000.000000E+00-CONT-0.000000E+000.000000E+000.000000E+00G0.000000E+000.000000E+000.000000E+00-CONT-0.000000E+000.000000E+000.000000E+00G2.735677E-04-4.337965E-02-6.186842E+00-CONT-0.000000E+000.000000E+000.000000E+00G1.613184E-04-4.679531E-02-6.197444E+00-CONT-0.000000E+000.000000E+000.000000E+00$TITLE=XXX$SUBTITLE=STATICMOUNTFORCES$LABEL=$SPCF$REALOUTPUT$SUBCASEID=1751G0.000000E+000.000000E+000.000000E+00-CONT-0.000000E+00-5.672217E+030.000000E+00$TITLE=XXX$SUBTITLE=STATICMOUNTFORCES$LABEL=$ELEMENTFORCES$REALOUTPUT$SUBCASEID=1$ELEMENTTYPE=11751G0.000000E+000.000000E+000.000000E+00-7.688483E+02-7.821117E+02-2.842171E-122.842171E-12相關(guān)測(cè)試CorrelationTests無。性能要求PerformanceRequirements無。分析要求ANALYSISREQUIREMENTS無。參考文件DOCUMENTATION無。聯(lián)系人CONTACTS無。例子EXAMPLESNASTRANSYSTEM(35)=0$$XXXENGINE$STATICMOUNTFORCES$SOL101CEND$====================================================================TITLE=XXXENGINESUBTITLE=StaticMountForces$SET10=751SET20=31001,31002,31003,31004SUBCASE1LOAD=2DISP(PUNCH)=ALLELFORCE(PUNCH)=20SPCFORCE(PUNCH)=10$====================================================================BEGINBULKPARAMGRDPNT0PARAMCOUPMASS1PARAMPOST-1$$$EngineXXX$$$Enginereferencesystem$CORD2R1000101524.00-106.00335.001524.00-106.00500.00+C10001+C100011524.00106.00500.00$$Enginecoordinatesystem$CORD2R1000210001.00.00.00-0.015470.136280.99055+C10002+C100020.999860.007820.01454$$Maininertiaaxis$CORD2R1000310002120.60-31.2096.3080.322.31181.47+C10003+C10003171.427.98222.33$$Centerofgravity$GRID75110002120.6-31.296.35$$Enginemass,inertiadata$CONM2575175110003.1581+M751+M7513671.09751.08595.0MOT_MAS$$$Leftenginemount$CORD2R100101574.00-461.15514.801574.00-461.153000.00+C1001+C10013000.00-461.15514.80$GRID40011574.000-461.149514.7998123456GRID220110010.00.00.01001RBE222017511234562201$CELAS111001112201140011CELAS121001122201240012CELAS131001132201340013$PELAS11100.0.070PELAS12100.0.070PELAS13125.0.070$$$Rightenginemount$CORD2R100201501.00479.55609.151501.00479.553000.00+C1002+C10023000.00479.55609.15$GRID40021501.000479.5500609.1499123456GRID220210020.00.00.01002RBE222027511234562202$CELAS111002212202140021CELAS121002222202240022CELAS131002232202340023$PELAS21140.0.10PELAS22400.0.10PELAS23125.0.10$$$Rearenginemount$CORD2R100301847.28-47.50171.901847.28-47.503000.00+C1003+C10033000.00-47.50171.90$GRID40051847.261-47.4671171.9370GRID220510030.00.00.01003RBE2