Development of harshness improvement technique focusing on axle trajectory

摘要

The vehicle with torsion beam suspension system is prone to generate vibration and noise when it passes over road joints and cleats, which are called harshness. In particular, the fore-aft shock when the vehicle is passing over a cleat at approximate 40 km/h is a significant problem. So focusing on the axle trajectory and frequency characteristics when the vehicle is passing over a cleat, the mechanism of the fore-aft shock is analyzed taking its relationship with the frequency characteristics of the road input into consideration. Moreover, such a technique is proposed that is helpful in improving not only the harshness hut also the compliance steer.