1基于有限元的彈性體

1、基于有限元的彈性體多體動力學(xué)仿真動力總成結(jié)構(gòu)動力學(xué)及噪聲解決方案OverviewAST EXCITE /roduction & Theoretical BackgroundPage 1AST EXCITE /roduction & Theoretical BackgroundPage 2roduction 介紹混合多體動力學(xué)仿真的特點(diǎn)部件本身采用有限元線彈性體描述，柔性體采用動、靜模態(tài)縮減法得到；Elasticlinear Bearing and MomentsForcalculated due tovibrating, roing and oscillating structure part

2、sActual Dynamics of Partsrepresented by condensed FE-msRadial Slider Bearing, Axial Thrust Bearing, Piston / Liner Contact, Ro ional Coupling, .線彈性體部件之間采用非線性連接副進(jìn)行，包精度的有限差分計(jì)算接ss觸與液力潤滑壓力；Various contact m up to highly accurate elasto-hydrodynamic joincluding asperity contact for couplingExciion Forand

3、 MomentsGas PrereValve Train Exciion多體仿真計(jì)算在時(shí)間域內(nèi)進(jìn)行，EXCITE到所有非線性連接副的載荷和位移邊界以及彈性體的動態(tài)響應(yīng)；All relevantPiston Slapexciion forcalculated wiVLertrainsoftwareAST EXCITE /roduction & Theoretical BackgroundPage 3Vibrating Structure PartsVibrating, Ro Oscillating Structureing,PartsArea of Application 應(yīng)用領(lǐng)域曲軸系概念階段

4、的總體設(shè)計(jì)液力潤滑軸承計(jì)算 Hydrodynamicsbearingysis曲軸系扭振特性計(jì)算 Toralcrshaft vibrations曲軸系強(qiáng)度計(jì)算 Crshaft strength曲軸系三維多體動力學(xué)分析 3DCrtrain dynamics behavior結(jié)構(gòu)部件瞬態(tài)強(qiáng)度分析Transientstrengnalysis曲軸 Crshaft連桿 Connecting Rod主軸承座 Main bearing wall活塞 PistonAST EXCITE /roduction & Theoretical BackgroundPage 4Area of Application 應(yīng)用領(lǐng)

5、域動力總成振動噪聲及平順性 NVH of er units動力總成懸置低頻振動特性計(jì)算Lowfrequency vibrationysis (engine mounts)結(jié)構(gòu)中高頻表面振動響應(yīng)及輻射噪聲Acoustics (surface velocities) of enginesander units高級彈性流體動力學(xué)特性 Advanced EHD contact simulation滑動軸承設(shè)計(jì)與計(jì)算 Slider bearing design活塞缸套潤滑及接觸 Piston-Liner contact ysis其他結(jié)構(gòu)特性 Beyond theertrainDynamics and s

6、trength of exhaust systemsVibration test bed)ysis of shaft connections (engineAST EXCITE /roduction & Theoretical BackgroundPage 5What makes AVL EXCITE so unique? EXCITE的特點(diǎn)針對動力總成部件結(jié)構(gòu)的快速建模環(huán)境AUTOSHAFT自動化曲軸結(jié)構(gòu)識別及柔性體生成模塊AutoSHAFT -crshaft mdirect from CADAutoSHAFT三維后處理模塊完成三維有限元與動力學(xué)結(jié)果的顯示IMPRESS - 3Dt-pros

7、ing and animation of dynamics andacoustics快速靈活的模版式的建模風(fēng)格Easyand muitive handling, partly automated creation有效的提高整個(gè)計(jì)算流程的效率Main Journal TorqueReduced overall pros time仿真結(jié)果的有效性與試驗(yàn)的一致性Web Bending計(jì)算得到的動載邊界及噪聲分布符合試驗(yàn)結(jié)果可驅(qū)動疲勞計(jì)算得到結(jié)構(gòu)的耐久性Page 6AST EXCITE /roduction & Theoretical BackgroundWhat makes AVL EXCITE s

8、o unique? EXCITE的特點(diǎn)對仿真模型的規(guī)模沒有任何限制Due tothe specific simulation approach no limiion withrespect to msize可建立非常復(fù)雜細(xì)致的動力總成整體結(jié)構(gòu)模型 Investigation of entireer unitswith high accuracy ms進(jìn)行多設(shè)計(jì)參數(shù)的評估與優(yōu)化Comprehensiveysis of influencing designparameters and theirerferenceToral CS Dynamics針對對象的復(fù)雜程度可有多種建模深度Various c

9、ontact ms and represenion ofstructure components of different complexity andaccuracyTransient CS Strengnalysis概念階段的優(yōu)化工具，定性設(shè)計(jì)階段的設(shè)計(jì)依據(jù)以及改進(jìn)設(shè)計(jì)中的評估平臺Optimal tool for concept, design as well asfor unitsysis and optimization of existingerAST EXCITE /roduction & Theoretical BackgroundPage 7egration Part I與AB

10、AQUS集成EXCITEABAQUSEXCITE v6.0EXCITE v6.1目標(biāo)CAD-SystemCAD-System3D CAD M將ABAQUS中有限元線性計(jì)算程序完FE Pre-prosor /FE Pre-prosor /全植入EXCITE中，可直接完成NVHEXCITEEXCITEAutoSHAFTCrshaft Parts和結(jié)構(gòu)耐久性的計(jì)算egration ofAutoSHAFTABAQUS FE solutiono AVLs Durability &NVH platformCrshaftEXCITEShaft MEXCITE從EXCITE v6.1加入曲軸動力學(xué)及Struc

11、tured MerShaft Mer強(qiáng)度特性和結(jié)構(gòu)NVH計(jì)算 for crshaftdynamics (structured m) and NVHysisForced VibrationSimulationEXCITE FEA 內(nèi)部有限元的功能CommerlStressysisEXCITE FEA linear結(jié)構(gòu)模態(tài)特性計(jì)算 Natural frequencyFE-Solverbased on ABAQUS(detailed m)ysisAVL Solution結(jié)構(gòu)動靜縮減計(jì)算CondensationFatigueCommerl SW forCommerl SW for線性靜力學(xué)計(jì)算 Lin

12、ear sic stressEvaluationFatigueysisFatigueysisysis線性結(jié)構(gòu)強(qiáng)迫響應(yīng)計(jì)算 Linear forcedresponseysisCrshaftysis Workflow ( StructureM)AST EXCITE /roduction & Theoretical BackgroundPage 8WorkflowDefinitions 各種連接副JoBasics About Jos Inside EXCITEEXCITE offers various different types of jos. General jos as well as sp

13、ecific jos forling,defined connections are available. For different applications and different levels of mdepending on expected results andysis time, more or less complex jos are offered.EXCITE中提供多種連接副模塊可模擬動力總成中的任何連接條件，不同的模型深度、對象模擬的細(xì)節(jié)程度以及計(jì)算成本的控制，決定使用哪些具體的非線性連接副；比如：對軸承連接可以采用點(diǎn)點(diǎn)形式、點(diǎn)面形式以及面面形式；Connection

14、s betnjos can be node-to-node (C-C), node-to-surface (C-S) and surface-to-surface contact (S-S). Asurface is represented by all its retained nodes.EXCITE主要的連接副Spring-Damper (REVO, ROTX (roional) 彈簧阻尼副Spring-Damper with Contact (L, AXBE) 考慮接觸剛度和間隙的彈簧阻尼副More General Equation: F, FTAB 一般性的彈性阻尼連接副HD Jos

15、 for Slider Bearings : HDBU, ENHD 液力潤滑軸承副EHD Jos for Slider Bearings: EHD2, TEHD 彈性液力潤滑軸承副Piston-Liner Contact: GUID (Spring-Damper with Contact),L (EHD) 活塞缸套接觸潤滑副Engine Mount Jos (frequency dependent characteristic): SLS, EMO1 動剛度特性的懸置Spel Jos (Differential, Universal, Bolt, Gear, Belt, .) 各種傳動連接副A

16、ST EXCITE /roduction & Theoretical BackgroundPage 9Definitions各種連接副JoGuidance (Piston/Liner) 活塞缸套導(dǎo)向Axial Thrust Bearing 止推軸承-linear Spring/Damper非線性彈簧阻尼Engine Mount (SLS) 懸置Engine Mount (EMO1) 頻變懸置ElastoHydroDynamics (EHD2) 彈性液力軸承Revolute Jo旋轉(zhuǎn)連接ThermoElastoHydroDynamics (TEHD)熱彈性液力軸承Roional Coupling

17、 轉(zhuǎn)動耦合Universal Jo萬向連接Dry-Elastic (3D) Piston-Liner Contact(DPLC) 干摩擦活塞缸套接觸副HydroDynamics (HD) 液力潤滑副Enhanced HydroDynamics (ENHD)加強(qiáng)的液力連接副Belt Connection 皮帶連接Hydro-Elastic (3D) Piston-Liner Contact(L) 液力潤滑活塞缸套接觸副EXCITE - EXCITE Timing Drive Link 聯(lián)合仿真接口Gear Jo齒輪副Differential Gear JoPlanetary Gear Jo差速齒

18、輪副行星齒輪副User Defined Table Jo接副用戶自定義連AST EXCITE /roduction & Theoretical BackgroundPage 10Solution Packs功能及模塊AVL EXCITE:Designer - 曲軸系快速分析工具Crshaft Dynamics 曲軸系三維彈性體動力學(xué)分析及疲勞強(qiáng)度分析Bearingysis 彈性液力軸承分析及熱彈性流體軸承分析Piston Dynamics 三維彈性活塞缸套接觸與潤滑連接副ertrain Dynamics 動力總成結(jié)構(gòu)動力學(xué)及結(jié)構(gòu)振動噪聲計(jì)算的解決方案AST EXCITE /roduction

19、& Theoretical BackgroundPage 11Exciteer Unit 建模環(huán)境使用方便的界面模塊化建模2D/3D后處理工具(包括動畫)AST EXCITE /roduction & Theoretical BackgroundPage 12Exciteer Unit 模版的有限元模型AST EXCITE /roduction & Theoretical BackgroundPage 13后處理t-Prosing2D后處理-Impress Chart曲線圖(工況比較)彩色分布圖Campbell圖MS-EXCEL和數(shù)據(jù)顯示表格文本AST EXCITE /roduction &

20、Theoretical BackgroundPage 14后處理t-Prosing3D彩色動畫后處理-IMPRESS噪聲結(jié)果振動表面速度級(1/3倍、或用戶定義頻發(fā)頻程、程)應(yīng)力軸承結(jié)果3D動畫:AVI格式AST EXCITE /roduction & Theoretical BackgroundPage 15仿真過程 Simulation Precedures振動及旋轉(zhuǎn)結(jié)構(gòu)部件動載氣體壓力MSC/NASTRAN ANSYS ABAQUS IDEAS齒輪系激勵(lì)活塞敲擊輸出扭矩零件耐久性輻射噪聲AST EXCITE /rPage 16主要方法Maethods主要數(shù)值計(jì)算方法多體動力學(xué)法有限元法彈

21、性液體動力學(xué)法AST EXCITE /roduction & Theoretical BackgroundPage 17主要結(jié)果 Main Results主要結(jié)果零部件的位移(動態(tài)變形)、速度和度曲軸扭振、縱振和彎振曲軸、連桿大頭動態(tài)變形機(jī)體振動和動態(tài)變形部件間相互作用力 軸承力和力矩等軸承結(jié)果軸心軌跡軸承承壓油膜壓力和油膜厚度等AST EXCITE /roduction & Theoretical BackgroundPage 18應(yīng)用:非線性軸系動力學(xué)Application:linear CrTrain Dynamics應(yīng)用一:軸系扭振考慮氣體力、質(zhì)量力等外載考慮相關(guān)部件的彎扭耦合考慮非線

22、性油膜剛度、軸承間隙、飛輪的陀螺效應(yīng)等計(jì)算扭振振幅、彎扭耦合應(yīng)力計(jì)算結(jié)果被大量試驗(yàn)所證實(shí)AST EXCITE /roduction & Theoretical BackgroundPage 19AST EXCITE /roduction & Theoretical BackgroundPage 20應(yīng)用:非線性軸系動力學(xué)Application:linear CrTrain Dynamics軸承載荷AST EXCITE /roduction & Theoretical BackgroundPage 21應(yīng)用:非線性軸系動力學(xué)Application:linear CrTrain Dynamics扭

23、振分析AST EXCITE /roduction & Theoretical BackgroundPage 22應(yīng)用:非線性軸系動力學(xué)Application:linear CrTrain Dynamics飛輪振動X向Y向Z向AST EXCITE /roduction & Theoretical BackgroundPage 23應(yīng)用:曲軸強(qiáng)度分析Application:linear CrTrain Dynamics應(yīng)用二:曲軸動態(tài)強(qiáng)度分析瞬態(tài)應(yīng)力和疲勞分析AST EXCITE /rPage 24曲軸動力學(xué)-模擬步驟有直接接口(用于SC/NASTRAN，ANSYS，ABAQUS)無直接接口(可用

24、于任何有限元) Without direct erface (any FE-Solver)With directerface(MSC/NASTRAN，ANSYS，ABAQUS)CAD-System三維CAD模型3D CAD-MFE-Prosor曲軸部位的三維剛度模型三維細(xì)化網(wǎng)格曲軸模型3D Stiffness Mof CS Parts3D Fine MesheMe.g.(FE-Solver)Shaft Mler當(dāng)量結(jié)構(gòu)曲軸模型Equivalent StructureM靜態(tài)和動態(tài)化簡FE-Solveric and Dynamic Reduction動態(tài)計(jì)算 Dynamic Calculation

25、ytical MethodFE-Preprosor曲軸關(guān)鍵部位對詳細(xì)模型e.g.Detailed Mof Critical CS Part應(yīng)力計(jì)算(整個(gè)曲軸模型) ysis (Complete CS MFE-SolverStress應(yīng)力計(jì)算 Stressysise.g. Femfat疲勞分析 Fatigue EvaluationAST EXCITE /roduction & Theoretical BackgroundPage 25)臨界區(qū)域和工況對選擇 Selection of Critical Area and Operating ConditionsS瞬態(tài)應(yīng)力和疲勞分析AST EXCIT

26、E /rPage 26應(yīng)用:零部件瞬態(tài)應(yīng)力分析Application: Transient stressysis應(yīng)用三:零部件瞬態(tài)應(yīng)力分析根據(jù)EXCITE結(jié)果，使用FEM求解器可確定給定工況下的瞬態(tài)應(yīng)力主要零部件如：連桿、軸承座等計(jì)算結(jié)果被試驗(yàn)所證實(shí)AST EXCITE /roduction & Theoretical BackgroundPage 27GeneralApproachMSet-UpSingle Speeds (Cases) orRun-up Speed Range: 3000 rpm - 5500 rpm (30 - 100 cycles)Consists ofMCondens

27、ed FE-M StructureCondensed FE-Mof Engineofinvestigated Conrod (CON6-body)EHD2 - BearingsCON6 or NOD6 - CrSimulationshaftEvaluation of Stresses of ConrodEvaluation of EHD Pre Film Distributionre anlAST EXCITE /roduction & Theoretical BackgroundPage 28應(yīng)用:連桿動力學(xué)-EHD軸承計(jì)算Speed Engine / 5000rpm - Conrod De

28、formation, Stress and Big EndBearing Oil Film Prere (Moved Conrod!)AST EXCITE /roduction & Theoretical BackgroundPage 29應(yīng)用:主軸承壁強(qiáng)度Application: Main Bearing Wall Strength主軸承壁瞬態(tài)強(qiáng)度分析基于EHD載荷的軸承分析發(fā)整個(gè)循環(huán)的軸承載荷作為有限元瞬態(tài)分析輸入數(shù)據(jù)結(jié)果 :Max瞬態(tài)應(yīng)力瞬態(tài)變形耐久疲勞Transient Main Bearing For主軸承瞬態(tài)力roduction & heoretical BackgroundAS

29、EXCI E /Page 30應(yīng)用:發(fā)非線性振動Applications:Enginelinear Dynamics應(yīng)用四:發(fā)非線性振動低頻振動 發(fā) 等高頻振動懸置缸套振動(結(jié)合ExcitePR活塞敲擊載荷分析)用于發(fā)等降噪AST EXCITE /roduction & Theoretical BackgroundPage 31應(yīng)用:發(fā)懸置振動Application: Engine Mount Vibrations發(fā)低頻振動分析AAccel. Level (dB)50 63Mount 1 - Horizontal DirectionMount 1 - Vertical Direction80

30、100160250400630100050 63 80 10016025040063010001/3 Octave Center Frequency (Hz)1/3 Octave Center Frequency (Hz)S EXCKeMeasurementSLSMOext lvin-VoigtMOMeasurementSLSMOext Kelvin-VoigtMOage 32I E /roduction & heoretical Background應(yīng)用:缸套高頻振動Applications:Liner Vibration頻率曲柄轉(zhuǎn)角AST EXCITE /roduction & Theor

31、etical BackgroundPage 33加速度加速度級應(yīng)用:發(fā)噪聲分析Applications: Engine Acoustics應(yīng)用五:發(fā)噪聲分析仿真結(jié)構(gòu)表面噪聲級整個(gè)發(fā)的集成模型零部件的相互作用(非線性油膜行為)考慮所有相關(guān)噪聲源模擬噪聲輻射精度高設(shè)計(jì)階段的噪聲優(yōu)化-減少試驗(yàn)AST EXCITE /roduction & Theoretical BackgroundPage 34應(yīng)用:發(fā)噪聲分析 Applications: Engine Acoustics表面振動速度級6 Cyl. Diesel,2000 rpm, Full LoadAST EXCITE /roduction &

32、Theoretical BackgroundPage 35應(yīng)用:發(fā)噪聲分析 Applications: Engine Acoustics表面振動速度級V6Gasoline 6500 rpmFull LoadAST EXCITE /roduction & Theoretical BackgroundPage 36液體動力滑動軸承Advanced Bearing Design應(yīng)用六:液體動力滑動軸承計(jì)算軸承動載軸頸和軸瓦結(jié)構(gòu)變形計(jì)算機(jī)油流量計(jì)算液動摩擦損失分析軸承損壞和點(diǎn)蝕等有助于噪聲優(yōu)化Page 37液體動力滑動軸承 Advanced Bearing Design可考慮彈性軸頸和軸瓦非線性油膜特性軸承幾何形狀：間隙、油槽、油孔、分割線等軸頸不對中軸瓦安裝變形機(jī)油粘溫和粘壓特性機(jī)油填充率AST EXCITE /roduction & Theoretical BackgroundPage 38不同的彈性液力連接副對比TransfersT ) 0(p0) ( pp )( T,T),ForceMomentEQ:ytical Reynolds equationHD