Multi-body dynamics and finite element method co-simulation for crankshaft dynamical strength analysis

doi:10.3785/j.issn.1008973X.2009.

2009, Vol. 43

Issue (09): 1638-1643 DOI: 10.3785/j.issn.1008973X.2009.

Multi-body dynamics and finite element method co-simulation for crankshaft dynamical strength analysis

GUO Lei¹, HAO Zhi-yong¹, LIU Bo², YU Bo²

(1. College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China;
2. R&D Department of Changan Automobile, Chongqing 401120, China )

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Abstract

The cranktrain and cylinder assemble multibody dynamics model using the stiffness and mass matrix were established with Excite powered by AVL. The each journal orbits and oil film pressure were obtained considering the elastic hydro dynamic bearing characteristics. The global finite element model was calculated by using the finite element analysis (FEA) submodel method. Then the critical pin fillet of the last crankweb was driven by the crankweb’s global model for calculating the stress history in an engine cycle. The dynamic fatigue safety factor of the critical fillet was obtained by using the strainlife fatigue model and fatigue strength comparison factor was evaluated with component design standard. The simulation results of the crankshaft modal parameters and the torsion vibration in running condition were compared by the experimental results. The method for crankshaft dynamics fatigue analysis showed good accuracy and efficiency．

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TK 413.3

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Cite this article:

GUO Lei, HAO Zhi-Yong, LIU Bo, et al. Multi-body dynamics and finite element method co-simulation for crankshaft dynamical strength analysis. J4, 2009, 43(09): 1638-1643.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008973X.2009. OR http://www.zjujournals.com/eng/Y2009/V43/I09/1638

曲轴强度多体动力学与有限元子模型法仿真

建立以曲轴系为核心的多柔性体动力学仿真系统,曲轴系及气缸体组件模型采用AVL Excite软件进行刚度与质量矩阵装配.在考虑轴承弹性流体动力学特性的条件下得到各轴颈轴心轨迹和油膜压力分布,利用有限元（FEA）子模型方法先求解曲柄臂整体模型的结果并驱动圆角子模型,得到危险工况下圆角精细有限元模型的各处动态应力历程及分布,最终使用高周疲劳应变寿命模型校核了圆角动态疲劳安全系数满足设计要求.对曲轴结构模态和运转条件下扭振响应的计算结果与实验值进行了对比,说明柔性体多体动力学结合有限元子模型方法进行曲轴动态疲劳强度的计算和校核是精度和效率均较高的一种计算方法.

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