柴油机运动机构综合强度动态分析

Dynamic integrative intensity analysis on moving mechanism of diesel

以计算多体动力学理论为指导,考虑到机构组件间的耦合因素,在柴油机整机实体建模的基础上建立了运动机构的刚柔混合多体动力学模型以及曲轴振动分析模型;并通过转速波动实验和振动烈度实验验证了模型的正确性。在此基础上分析了组件的动态强度,并利用有限元方法进行对比验证,结果表明了多体动力学方法应用柴油机运动机构强度校核的可靠性与准确性;另外通过曲轴振动分析模型对曲轴进行振动耦合分析。整个分析过程提供了一种柴油机运动机构组件强度校核、结构优化以及故障分析时简单可靠可行的方法。

With the instruction of computational dynamics of multi-body system,considering coupling factor between the subassemblies of mechanism,the whole diesel system consisting of the rigid-flexible bodies model of moving mechanism and the model of crankshaft torsional vibration was estabilished.The integral model was proved by the vibration intensity experiment and the speed fluctuation experiment of the diesel.Based on these,the dynamic strength of the diesel was analysed by using the multi-body system dynamics and then verified with the finite element method.The results show that the method is correct and credible.Then the coupled vibration of crankshaft was analysed by using the model of crankshaft torsional vibration.The whole analysis process provides a simple and feasible approach to check the strength of the diesel moving mechanism to optimize structure,and to implement fault analysis.