关键词: 皮卡；后轴侧滑；反向跳；阻尼比

Abstract: For pickups equipped with rear leaf-spring drive axles, rear-axle skidding is prone to occur when driving on rough roads. This paper analyzes the mechanism of skidding and proposes measures to mitigate it. Based on the correlation between skidding and rear-axle reverse hop, a theoretical model of reverse hop is established to analyze its natural frequency and the factors influencing its resonance amplitude. The theory proves that the shock absorber span has a greater influence on the reverse-hop amplitude than the damping force coefficient, and that an optimal damping force coefficient exists to suppress the amplitude, which is not necessarily better when larger. The damping ratio corresponding to this optimal damping force coefficient is compared with the optimal suspension damping ratios targeted at comfort and safety, and the results show that the optimal damping ratios of shock absorbers corresponding to different performance requirements are different.

Key words: pickup truck; rear axle skid; reverse jump; damping ratio