The dynamic optimization design of structure of motorcycle frame based on MSC.Nastran

First research the dynamic property of frame structure using the finite element method,and the finite element model is set up through comparing the calculating result of theory with the analysis result of experiment.Then based on two origins causing the vibration of motorcycle(the road excitation and the engine excitation)and mainly taking the engine excitation into account,has the dynamic optimization for the structure of the frame,which will avoid effectively the resonance resulted from the first second steps inertia frequency of the engine in accord with the inherent frequency of the frame,finally,the dynamic characteristic is improved and the motorcycle is more comfortable and durable.