1基于有限元的弹性体

1、基于有限元的弹性体多体动力学仿真动力总成结构动力学及噪声解决方案OverviewAST EXCITE /roduction & Theoretical BackgroundPage 1AST EXCITE /roduction & Theoretical BackgroundPage 2roduction 介绍混合多体动力学仿真的特点部件本身采用有限元线弹性体描述，柔性体采用动、静模态缩减法得到；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, .线弹性体部件之间采用非线性连接副进行，包精度的有限差分计算接ss触与液力润滑压力；Various contact m up to highly accurate elasto-hydrodynamic joincluding asperity contact for couplingExciion Forand

3、 MomentsGas PrereValve Train Exciion多体仿真计算在时间域内进行，EXCITE到所有非线性连接副的载荷和位移边界以及弹性体的动态响应；All relevantPiston Slapexciion forcalculated wiVLertrainsoftwareAST EXCITE /roduction & Theoretical BackgroundPage 3Vibrating Structure PartsVibrating, Ro Oscillating Structureing,PartsArea of Application 应用领域曲轴系概念阶段

4、的总体设计液力润滑轴承计算 Hydrodynamicsbearingysis曲轴系扭振特性计算 Toralcrshaft vibrations曲轴系强度计算 Crshaft strength曲轴系三维多体动力学分析 3DCrtrain dynamics behavior结构部件瞬态强度分析Transientstrengnalysis曲轴 Crshaft连杆 Connecting Rod主轴承座 Main bearing wall活塞 PistonAST EXCITE /roduction & Theoretical BackgroundPage 4Area of Application 应用领

5、域动力总成振动噪声及平顺性 NVH of er units动力总成悬置低频振动特性计算Lowfrequency vibrationysis (engine mounts)结构中高频表面振动响应及辐射噪声Acoustics (surface velocities) of enginesander units高级弹性流体动力学特性 Advanced EHD contact simulation滑动轴承设计与计算 Slider bearing design活塞缸套润滑及接触 Piston-Liner contact ysis其他结构特性 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的特点针对动力总成部件结构的快速建模环境AUTOSHAFT自动化曲轴结构识别及柔性体生成模块AutoSHAFT -crshaft mdirect from CADAutoSHAFT三维后处理模块完成三维有限元与动力学结果的显示IMPRESS - 3Dt-pros

7、ing and animation of dynamics andacoustics快速灵活的模版式的建模风格Easyand muitive handling, partly automated creation有效的提高整个计算流程的效率Main Journal TorqueReduced overall pros time仿真结果的有效性与试验的一致性Web Bending计算得到的动载边界及噪声分布符合试验结果可驱动疲劳计算得到结构的耐久性Page 6AST EXCITE /roduction & Theoretical BackgroundWhat makes AVL EXCITE s

8、o unique? EXCITE的特点对仿真模型的规模没有任何限制Due tothe specific simulation approach no limiion withrespect to msize可建立非常复杂细致的动力总成整体结构模型 Investigation of entireer unitswith high accuracy ms进行多设计参数的评估与优化Comprehensiveysis of influencing designparameters and theirerferenceToral CS Dynamics针对对象的复杂程度可有多种建模深度Various c

9、ontact ms and represenion ofstructure components of different complexity andaccuracyTransient CS Strengnalysis概念阶段的优化工具，定性设计阶段的设计依据以及改进设计中的评估平台Optimal tool for concept, design as well asfor unitsysis and optimization of existingerAST EXCITE /roduction & Theoretical BackgroundPage 7egration Part I与AB

10、AQUS集成EXCITEABAQUSEXCITE v6.0EXCITE v6.1目标CAD-SystemCAD-System3D CAD M将ABAQUS中有限元线性计算程序完FE Pre-prosor /FE Pre-prosor /全植入EXCITE中，可直接完成NVHEXCITEEXCITEAutoSHAFTCrshaft Parts和结构耐久性的计算egration ofAutoSHAFTABAQUS FE solutiono AVLs Durability &NVH platformCrshaftEXCITEShaft MEXCITE从EXCITE v6.1加入曲轴动力学及Struc

11、tured MerShaft Mer强度特性和结构NVH计算 for crshaftdynamics (structured m) and NVHysisForced VibrationSimulationEXCITE FEA 内部有限元的功能CommerlStressysisEXCITE FEA linear结构模态特性计算 Natural frequencyFE-Solverbased on ABAQUS(detailed m)ysisAVL Solution结构动静缩减计算CondensationFatigueCommerl SW forCommerl SW for线性静力学计算 Lin

12、ear sic stressEvaluationFatigueysisFatigueysisysis线性结构强迫响应计算 Linear forcedresponseysisCrshaftysis Workflow ( StructureM)AST EXCITE /roduction & Theoretical BackgroundPage 8WorkflowDefinitions 各种连接副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中提供多种连接副模块可模拟动力总成中的任何连接条件，不同的模型深度、对象模拟的细节程度以及计算成本的控制，决定使用哪些具体的非线性连接副；比如：对轴承连接可以采用点点形式、点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主要的连接副Spring-Damper (REVO, ROTX (roional) 弹簧阻尼副Spring-Damper with Contact (L, AXBE) 考虑接触刚度和间隙的弹簧阻尼副More General Equation: F, FTAB 一般性的弹性阻尼连接副HD Jos

15、 for Slider Bearings : HDBU, ENHD 液力润滑轴承副EHD Jos for Slider Bearings: EHD2, TEHD 弹性液力润滑轴承副Piston-Liner Contact: GUID (Spring-Damper with Contact),L (EHD) 活塞缸套接触润滑副Engine Mount Jos (frequency dependent characteristic): SLS, EMO1 动刚度特性的悬置Spel Jos (Differential, Universal, Bolt, Gear, Belt, .) 各种传动连接副A

16、ST EXCITE /roduction & Theoretical BackgroundPage 9Definitions各种连接副JoGuidance (Piston/Liner) 活塞缸套导向Axial Thrust Bearing 止推轴承-linear Spring/Damper非线性弹簧阻尼Engine Mount (SLS) 悬置Engine Mount (EMO1) 频变悬置ElastoHydroDynamics (EHD2) 弹性液力轴承Revolute Jo旋转连接ThermoElastoHydroDynamics (TEHD)热弹性液力轴承Roional Coupling

17、 转动耦合Universal Jo万向连接Dry-Elastic (3D) Piston-Liner Contact(DPLC) 干摩擦活塞缸套接触副HydroDynamics (HD) 液力润滑副Enhanced HydroDynamics (ENHD)加强的液力连接副Belt Connection 皮带连接Hydro-Elastic (3D) Piston-Liner Contact(L) 液力润滑活塞缸套接触副EXCITE - EXCITE Timing Drive Link 联合仿真接口Gear Jo齿轮副Differential Gear JoPlanetary Gear Jo差速齿

18、轮副行星齿轮副User Defined Table Jo接副用户自定义连AST EXCITE /roduction & Theoretical BackgroundPage 10Solution Packs功能及模块AVL EXCITE:Designer - 曲轴系快速分析工具Crshaft Dynamics 曲轴系三维弹性体动力学分析及疲劳强度分析Bearingysis 弹性液力轴承分析及热弹性流体轴承分析Piston Dynamics 三维弹性活塞缸套接触与润滑连接副ertrain Dynamics 动力总成结构动力学及结构振动噪声计算的解决方案AST EXCITE /roduction

19、& Theoretical BackgroundPage 11Exciteer Unit 建模环境使用方便的界面模块化建模2D/3D后处理工具(包括动画)AST EXCITE /roduction & Theoretical BackgroundPage 12Exciteer Unit 模版的有限元模型AST EXCITE /roduction & Theoretical BackgroundPage 13后处理t-Prosing2D后处理-Impress Chart曲线图(工况比较)彩色分布图Campbell图MS-EXCEL和数据显示表格文本AST EXCITE /roduction &

20、Theoretical BackgroundPage 14后处理t-Prosing3D彩色动画后处理-IMPRESS噪声结果振动表面速度级(1/3倍、或用户定义频发频程、程)应力轴承结果3D动画:AVI格式AST EXCITE /roduction & Theoretical BackgroundPage 15仿真过程 Simulation Precedures振动及旋转结构部件动载气体压力MSC/NASTRAN ANSYS ABAQUS IDEAS齿轮系激励活塞敲击输出扭矩零件耐久性辐射噪声AST EXCITE /rPage 16主要方法Maethods主要数值计算方法多体动力学法有限元法弹

21、性液体动力学法AST EXCITE /roduction & Theoretical BackgroundPage 17主要结果 Main Results主要结果零部件的位移(动态变形)、速度和度曲轴扭振、纵振和弯振曲轴、连杆大头动态变形机体振动和动态变形部件间相互作用力 轴承力和力矩等轴承结果轴心轨迹轴承承压油膜压力和油膜厚度等AST EXCITE /roduction & Theoretical BackgroundPage 18应用:非线性轴系动力学Application:linear CrTrain Dynamics应用一:轴系扭振考虑气体力、质量力等外载考虑相关部件的弯扭耦合考虑非线

22、性油膜刚度、轴承间隙、飞轮的陀螺效应等计算扭振振幅、弯扭耦合应力计算结果被大量试验所证实AST EXCITE /roduction & Theoretical BackgroundPage 19AST EXCITE /roduction & Theoretical BackgroundPage 20应用:非线性轴系动力学Application:linear CrTrain Dynamics轴承载荷AST EXCITE /roduction & Theoretical BackgroundPage 21应用:非线性轴系动力学Application:linear CrTrain Dynamics扭

23、振分析AST EXCITE /roduction & Theoretical BackgroundPage 22应用:非线性轴系动力学Application:linear CrTrain Dynamics飞轮振动X向Y向Z向AST EXCITE /roduction & Theoretical BackgroundPage 23应用:曲轴强度分析Application:linear CrTrain Dynamics应用二:曲轴动态强度分析瞬态应力和疲劳分析AST EXCITE /rPage 24曲轴动力学-模拟步骤有直接接口(用于SC/NASTRAN，ANSYS，ABAQUS)无直接接口(可用

24、于任何有限元) Without direct erface (any FE-Solver)With directerface(MSC/NASTRAN，ANSYS，ABAQUS)CAD-System三维CAD模型3D CAD-MFE-Prosor曲轴部位的三维刚度模型三维细化网格曲轴模型3D Stiffness Mof CS Parts3D Fine MesheMe.g.(FE-Solver)Shaft Mler当量结构曲轴模型Equivalent StructureM静态和动态化简FE-Solveric and Dynamic Reduction动态计算 Dynamic Calculation

25、ytical MethodFE-Preprosor曲轴关键部位对详细模型e.g.Detailed Mof Critical CS Part应力计算(整个曲轴模型) ysis (Complete CS MFE-SolverStress应力计算 Stressysise.g. Femfat疲劳分析 Fatigue EvaluationAST EXCITE /roduction & Theoretical BackgroundPage 25)临界区域和工况对选择 Selection of Critical Area and Operating ConditionsS瞬态应力和疲劳分析AST EXCIT

26、E /rPage 26应用:零部件瞬态应力分析Application: Transient stressysis应用三:零部件瞬态应力分析根据EXCITE结果，使用FEM求解器可确定给定工况下的瞬态应力主要零部件如：连杆、轴承座等计算结果被试验所证实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应用:连杆动力学-EHD轴承计算Speed Engine / 5000rpm - Conrod De

28、formation, Stress and Big EndBearing Oil Film Prere (Moved Conrod!)AST EXCITE /roduction & Theoretical BackgroundPage 29应用:主轴承壁强度Application: Main Bearing Wall Strength主轴承壁瞬态强度分析基于EHD载荷的轴承分析发整个循环的轴承载荷作为有限元瞬态分析输入数据结果 :Max瞬态应力瞬态变形耐久疲劳Transient Main Bearing For主轴承瞬态力roduction & heoretical BackgroundAS

29、EXCI E /Page 30应用:发非线性振动Applications:Enginelinear Dynamics应用四:发非线性振动低频振动 发 等高频振动悬置缸套振动(结合ExcitePR活塞敲击载荷分析)用于发等降噪AST EXCITE /roduction & Theoretical BackgroundPage 31应用:发悬置振动Application: Engine Mount Vibrations发低频振动分析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应用:缸套高频振动Applications:Liner Vibration频率曲柄转角AST EXCITE /roduction & Theor

31、etical BackgroundPage 33加速度加速度级应用:发噪声分析Applications: Engine Acoustics应用五:发噪声分析仿真结构表面噪声级整个发的集成模型零部件的相互作用(非线性油膜行为)考虑所有相关噪声源模拟噪声辐射精度高设计阶段的噪声优化-减少试验AST EXCITE /roduction & Theoretical BackgroundPage 34应用:发噪声分析 Applications: Engine Acoustics表面振动速度级6 Cyl. Diesel,2000 rpm, Full LoadAST EXCITE /roduction &

32、Theoretical BackgroundPage 35应用:发噪声分析 Applications: Engine Acoustics表面振动速度级V6Gasoline 6500 rpmFull LoadAST EXCITE /roduction & Theoretical BackgroundPage 36液体动力滑动轴承Advanced Bearing Design应用六:液体动力滑动轴承计算轴承动载轴颈和轴瓦结构变形计算机油流量计算液动摩擦损失分析轴承损坏和点蚀等有助于噪声优化Page 37液体动力滑动轴承 Advanced Bearing Design可考虑弹性轴颈和轴瓦非线性油膜特性轴承几何形状：间隙、油槽、油孔、分割线等轴颈不对中轴瓦安装变形机油粘温和粘压特性机油填充率AST EXCITE /roduction & Theoretical BackgroundPage 38不同的弹性液力连接副对比TransfersT ) 0(p0) ( pp )( T,T),ForceMomentEQ:ytical Reynolds equationHD