关键词: 越野车；仿生悬架；平顺性；非线性刚度

Abstract: Aiming at the problem of poor ride comfort of off-road vehicles with traditional linear suspension, this paper proposes an off-road vehicle ride comfort improvement scheme based on double diamond bionic kangaroo leg suspension (hereinafter referred to as bionic suspension), and studies the influence of bionic suspension arrangement scheme, spring stiffness ratio and body offset frequency ratio on vehicle ride comfort. The results show that: 1) The bionic suspension has obvious nonlinear stiffness characteristics, and the characteristics are enhanced with the increase of the spring stiffness ratio. 2) Compared with other arrangement schemes, the scheme using bionic suspension on both front and rear axles has the best ride comfort. 3) When the road surface is poor, the higher the bionic suspension stiffness ratio, the better the vehicle ride; with the reduction of the static deflection ratio of the bionic suspension of the front and rear axle, the vertical vibration and pitch vibration of the body are reduced. The above results show that the off-road vehicle with nonlinear bionic suspension shows good ride comfort, which verifies the correctness and effectiveness of the proposed bionic suspension research idea.

Key words: Off-road vehicle; Bionic suspension; Ride comfort; Nonlinear stiffness