Modeling and Simulation Analysis of Semi-active Oil and Gas Spring Characteristics

In order to further improve the average off-road speed of special vehicles, a semi-active oil and gas spring design scheme is proposed, and the multi-stage damping adjustable function can be realized by parallel proportional throttle valve. Based on the physical model of oil and gas springs, the series-parallel relationship of adjustable damping throttling is extracted, and the derivation of analytical equations between flow and differential pressure is carried out; In addition, the flow characteristics of the proportional throttle valve were fitted by least squares fitting, and the exact correspondence between current and flow coefficient was obtained. Combined with the actual gas state equation, the simulation results of the oil and gas springs under different currents are simulated and compared with the experimental data to verify the correctness of the model; Finally, the analysis of the influencing factors of the performance characteristics was carried out, which laid the foundation for the design of oil and gas springs.