基于AVL-EXCITE的内燃机连杆轴承润滑仿真分析

内燃机连杆轴承的润滑状况对连杆轴承的使用寿命影响很大。随着内燃机的不断强化,对连杆轴承性能的要求也相应提高。因此,深入研究连杆轴承的润滑问题以便更加准确地分析和设计轴承的性能便显得日益重要。首先从理论上阐述了润滑状况对轴承工作可靠性的影响,然后针对某发动机的连杆,在AVL-EXCITE中建立了连杆的柔性多体动力学与动力润滑耦合仿真模型。通过计算得到了连杆轴承的轴心轨迹、最小油膜厚度和最大油膜压力等参数,并比较了转速、轴承间隙和温度对轴承润滑性能的影响。研究结果对连杆轴承动力学耦合分析和优化设计以及判断轴承工作的可靠性具有重要意义。

Lubricating simulation analysis of connecting rod bearing based on AVL-EXCITE

The lubrication state of the connecting rod beating has tremendous influence to the engine useful life. While strengthening constantly with engine,the performance requirements of the connecting rod beating has a corresponding increase. Therefore,tile in-depth study on the lubrication problem of the connecting rod bearing for a more accurate analysis and design of beating performance will become increasingly important. Firstly, the theoretical effect of the lubrication conditions on the reliability of the bearing was described. Then the dynamics analytical model of the connecting rod flexible multi-body of a diesel considering hydrodynamic lubrication was established by AVL-EXCITE. The parameters were calculated,including journal center locus,the minimum oil film thickness,the peak oil fihn pressure and so on. The effects of different factors such as rotating speed, bearing clearance and temperature were also analyzed.The results indicate that the research is important to the estimation of the reliability of the bearings, the coupling dynamic analysis and the optimization design of the connecting rod bearing.