Abstract:Hydropneumatic suspension has simple structure and good nonlinear stiffness and damping characteristics, which is an important damping device in load dump truck. Through the hydropneumatic suspension internal heat model, the temperature change and heat exchange between different parts in the suspension under the vehicle worked were visually presented. According to the structural characteristics of the hydropneumatic suspension, a complete heat exchange model was built based on Simulink, the dynamic characteristics of the working process and the heat transfer laws between different parts were analyzed. The hydropneumatic suspension test bench was designed and built, the suspension passive incentive was simulated, and the static and dynamic characteristics were tested, then the output force, interior physical parameters such as oil and nitrogen temperature were measured. Comparison of model and experimental results show that under certain incentive, with work suspension time lasting, final temperature of each part will gradually reach a state of balance; in the real working condition, the oil temperature rising influence is the major factor and temperature rise has a certain influence on the output force characteristics, which shows the model accuracy. It provides reference for further research.