4Krog L A, Olhoff N. Optimum topology and reinforcement design of disk and plate structures with multiple stiffness and eigenfre-quency objectives. Comput Struct, 1999, 72 : 535.
5Ke Yu, Albert C J Luo. The periodic impact responses and stability of a human body in a vehicle traveling on rough terrain[J]. Journal of Sound and Vibration, 2004(272) :267- 286.
6Verros G, Natsiavas S. Ride dynamics of nonlinear vehicle models using component mode synthsis[J]. Journal of Vibration and Acoustics, 2002(124):427-434.