Modeling and Torsional Vibration Analysis of Engine Based on Virtual Prototype Technology

The paper puts forward a method based on the Virtual Prototype Technology to analyze the torsional vi- bration of the engine shafting.Firstly a dynamic model of engine including flexible engine shafting is built based on the rigid engine model,the frequency of each modal of the engine shafting is calculated through the FEA software AN- SYS.Then the exciting torque of the engine is calculated through dynamical simulation of the model,and all the tor- sional vibration exciting harmonics are analyzed by the method of Fourier divergent transform.Lastly torsional vibra- tion stress of the dangerous place of the shaft is calculated through the simulation analysis of the engine model working on the resonance vibration condition.The method provides abundant reference data for actually analyzing the torsional vibration of engine shafting.