Dynamic Characteristics of Crankshaft-Connecting Rod of Diesel Engine

The dynamic characteristics of crankshaft-connecting rod of the Cummins 6BT5.9 diesel engine were studied using a combined method of experimental modal and finite element analysis to optimize the dynamic performance,intensity of vibration and structure design.In the finite element analysis,the boundary conditions of combined structure were simulated by methods of coupled degrees of freedom,spring-damper unit connection and virtual material,respectively.Frequency criteria was then used to investigate the correlation analysis of the modal parameters obtained.It shows that the correlation between the calculated and experimental parameters by spring-damper unit connection and virtual material method is higher,which are more reasonable in dealing with the joint surface contact.It provides a theoretical basis for dynamic analysis and optimization design of diesel engine.