Advanced Simulation Technologies 蓝军博士 AVL-AST NVH Seminar 24 May, 2005, Shanghai EXCITE EXCITE - - 发动机 发动机 振动噪声仿真 振动噪声仿真 Engine NVH Simulation AVL-AST NVH Seminar 24 May, 2005, Shangha

i Page 2 轴系动力学非线性分析 轴系动力学非线性分析 Non-linear Analysis of Crank Train Dynamics 发动机总成和悬置的低频振动 发动机总成和悬置的低频振动 分析 分析 Low Frequency Vibration Analysis of Power Unit and Engine Mountings 发动机总成 发动机总成 的声学分析 的声学分析 Acoustic Analysis of Power Units 高级滑动轴承设计 高级滑动轴承设计 Advanced Slider Bearing Design 3D 3D 活塞动力学 活塞动力学 3D Piston Dynamics 应用范围 应用范围Field of Applications 概述 概述General AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 3 曲轴、主轴承壁、连杆等的 曲轴、主轴承壁、连杆等的动载和变形分 动载和变形分 析 析Dynamic Loads and Deformations for Design Analysis (Main Bearing Wall, Crankshaft, Connecting Rod, etc.) 轴承载荷分析 轴承载荷分析,考虑弹性液体的非线性耦 考虑弹性液体的非线性耦 合效应 合效应Bearing Load Evaluation, considering the elastohydrodynamics nonlinear coupling effects. 基于 基于EXCITE EXCITE计算结果，用有限元软件，进 计算结果，用有限元软件，进 一步求解曲轴、连杆等部件在整个发动机 一步求解曲轴、连杆等部件在整个发动机 循环中的瞬态动应力。 循环中的瞬态动应力。Further Stress Analysis with FE-Solver, based on EXCITE Engine Cycle Results (Main Bearing Wall, Crankshaft, Connecting Rod, etc.) 瞬态应力分析 瞬态应力分析Transient Strength Analysis 轴系动力学分析 轴系动力学分析Crank Train Dynamics 概述 概述General AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 4 高级滑动轴承分析 高级滑动轴承分析Advanced Slide Bearing Analysis 3D 3D活塞接触分析 活塞接触分析3D Piston Contact 预测外载作用下发动机总成和悬置的低频振 预测外载作用下发动机总成和悬置的低频振 动 动, ,以及 以及达 达500 500- -3000 3000Hz Hz的高频 的高频辐射 辐射噪声。 噪声。 Predict vibrations and noise radiation of engine structures up to a few kHz due to external load. Such as High Frequent Noise (500- 3000Hz), or Low Frequency Vibration Analysis of Power Unit and Engine Mountings 计算从燃烧室到机体表面的非线性振动传递 计算从燃烧室到机体表面的非线性振动传递, , 或外载造成的振动传递。 或外载造成的振动传递。Calculates the nonlinear vibration transfer from the combustion chamber to the block surface. 振动噪声 振动噪声NVH 进阶 进阶Advanced 概述 概述General AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 5 E E XCITE XCITE 模型 模型EXCITE Model AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 6 E E XCITE XCITE 发动机动力学和声学的 发动机动力学和声学的 多体动力学分析 多体动力学分析 Multi-Body Dynamic Simulation for Engine Dynamics and Acoustics using EXCITE 模型、激励和响应 模型、激励和响应 AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 7 Engine Mounts Engine Mounts Main Bearings Transmitting of Piston Side Forces Torque 德国汽车工业协会AK32的计算 EXCITE and FEM Models Graphical Representation of the EXCITE and FEM Models AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 8 M e a s u r e m e n t S i m u l a t i o n ( E X C I T E ) Acceleration at Main Bearing Cap 3000rpm (full load) Integral Velocity Level for Predefined Section 3000rpm (motored) 德国汽车工业协会AK32的试验和计算对比 Calculation Results and Comparison to the Measurements AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 9 德国汽车工业协会AK32结论 Conclusions ...EXCITE provides various modelling possibilities for NVH analysis EXCITE EXCITE提供了 提供了NVH NVH建模的各种可能 建模的各种可能 ...There is no restriction in modelling and consideration of different excitations 无建模约束，可考虑任何形式的激励源 无建模约束，可考虑任何形式的激励源 ...the simulation software is very efficient 仿真计算非常高效 仿真计算非常高效 ...EXCITE provides logical results 获得合理的结果 获得合理的结果 ...the company made a very solid and competent impression in answering the questionnaire as well as in performing the benchmark calculations 评价中反映出 评价中反映出AVL AVL公司分析实力强 公司分析实力强 ...all required data and results have been provided in time and complete 评价中反映出 评价中反映出AVL AVL公司及时提供完整的输入数据和结果 公司及时提供完整的输入数据和结果 Strength of AVL EXCITE优点 No obvious weak point. 无明显弱点 无明显弱点 Weak Points of AVL EXCITE弱点 AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 10 Conclusions Regarding AVL EXCITE Requirement by AK32 Intensive Development Required Sufficient Main Defects; Not Sufficient Main requirement is the speed-up of simulation when using EHD2 bearing joints. The usage of EHD2 increases point “Modelling Approach”, but reduces the point “Calculation Time”. Development Potential SW Efficiency Calculation Time Modelling Approach Modelling Potential Application Know-how Engine Sim. SW Development Competence. Result Quality and Plausibility AVL EXCITE defines the envelope of all evaluated competitor tools for all points (except “Modelling Approach” - see previous explanation) and is therefore the actual Benchmark on the market! 德国汽车工业协会AK32结论 Conclusions AVL-AST NVH Seminar 24 May, 2005, Shanghai Page 11 曲轴 曲轴, ,Shaftmodeler生成 生成NOD6类型 类型 Crankshaft ? NOD6 (SHM) 主轴承 主轴承( (C-C耦合 耦合), ),弹簧或简 弹簧或简 易液动 易液动Main Bearings (Node-to-Node Coupling) ? REVO / ENHD w/o Misalignment ? ENHD incl. Misalignment 柔性支承 柔性支承( (主轴承壁 主轴承壁) )，全局 ，全局 刚度和阻尼 刚度和阻尼Flexible Support (~Main Bearing Walls) ?Spring-Damper with Global Stiffness in EXCITE 主要仿真目标 主要仿真目标Main Simulation Target: 曲轴动力学 曲轴动力学CS-Dynamics 定义主要尺寸 定义主要尺寸Definition of Main Dimensions Coupling with iSIGHT (Optimisation) 飞轮设计 飞轮设计Flywheel Layout 扭振减振器设计 扭振减振器设计TV-Damper Layout 曲轴强度 曲轴强度( (基础 基础) ) CS Strength (Basic) EXCITE Designer 主轴承载荷 主轴承载荷( (基础 基础) ) MB Loads (Basic) 直接施加曲柄销力 直接施加曲柄销力( (无连杆和活 无连杆和活 塞 塞) ) Forces Acting Directly on Crank Pins (no Conrods and Pistons) 轴向支承 轴向支承( (刚性 刚性) ) Axial Support (Rigid) 建模级别一 建模级别一Modeling Level L1 特点：用于概念设计阶段 特点：用于概念设计阶段?? ??曲轴方案设计、扭振减振器和飞轮方案制定时可使用。可 曲轴方案设计、扭振减振器和飞轮方案制定时可使用。可 导入 导入Designer Designer中进行曲轴安全系数计算。误差：运动学载荷 中进行曲轴安全系数计算。误差：运动学载荷, ,过于简化的主轴承耦合。 过于简化的主轴承耦合。