Design and Dynamic Analysis of Bounce and Pitch Plane Hydraulically Interconnected Suspension for Mining Vehicle to Improve Ride Comfort and Pitching Stiffness

This paper demonstrates time response analysis of the mining vehicle with bounce and pitch plane hydraulically interconnected suspension (HIS) system. Since the mining vehicles working in harsh conditions inducing obvious pitch motion and the hard stiffness of suspensions leading to the acute vibration, the passive hydraulically interconnected system is proposed to provide better ride comfort. Furthermore, the hydraulic system also increases the suspension stiffness in the pitch mode to prevent vehicle from large pitch motions. According to the hydraulic and mechanical coupled characteristic of the mining vehicles, a 7degrees of freedom (7-DOFS) mathematical model is employed and the state space method is used to establish the mechanical and hydraulic coupled dynamic equations. In this paper, the vehicles are subjected to straight line braking input, triangle block bump input applied to the wheels and random road tests. By discussing the result of the simulation, the HIS system can provide a reasonable comfort performance. From the angle of time domain, the analysis of mining vehicle dynamic response characteristics is obtained; the result shows that the hydraulically interconnected system can reduce the vertical stiffness and add the pitch stiffness in order to improve the ride comfort and reduce the pitch motion.