Improved Vibration Characteristics of a Tri-axle Straight Truck Fitted with Hydraulically Interconnected Suspension

摘要

A new hydraulically interconnected suspension (HIS) system is proposed to improve the vibration characteristics of a tri-axle straight truck in pitch plane. The equations of motion of mechanical and hydraulic coupled system are derived by integrating equations of mechanical subsystem and fluid external forces at the mechanical and hydraulic boundary sections. These subsystem equations are obtained and derived using free body diagram method and transfer impedance matrix method respectively. Based on the dynamic equations of coupled system, the vibration characteristics are investigated through modal analysis and forced vibration analysis. The obtained results reveal that the HIS system alters the mode stiffness/damping and significantly inhibit the pitch motion of truck body, and simultaneously the bounce acceleration is inevitably reduced due to the bounce/pitch coupling dynamics characteristics. Meanwhile, HIS system favorably changes the tire force distribution between the front and rear.