Modelling and control of a semi-active dual-chamber hydro-pneumatic inerter-based suspension system

This study develops a new type of semi-active dual-chamber hydro-pneumatic inerter-based suspension (SADHPIS) based on the 'inerter-spring-damping' vibration isolation system and semi-active control. The mathematical model of SADHPIS is linearised to match the nonlinear SADHPIS system with a linear control strategy, and the equivalent parameters are calculated. A linear-quadratic-Gaussian (LQG) controller that matches the nonlinear characteristics of the SADHPIS system is designed. Furthermore, the performance of a quarter-vehicle model with SADHPIS is analysed and compared with that with normal semi-active hydro-pneumatic suspension (SAHPS). Simulation results show that the performance of SADHPIS is better than that of SAHPS, indicating that ride comfort and handle stability are improved greatly in SADHPIS. A prototype is also developed, and a comparative bench test is conducted to verify the accuracy of the simulations. SADHPIS can realise adjustable inertia with a small space and low energy consumption. This work provides new insights for research on variable inertia, promotes the matching of inerters and hydro-pneumatic suspension systems and further proves the practical application value of hydro-pneumatic inerter-based suspension.

Automated summary

This study introduces a new type of semi-active dual-chamber hydro-pneumatic inerter-based suspension system with a linear control strategy. Simulation and comparison results show that the performance of SADHPIS is superior to traditional systems, improving ride comfort and handling stability. Experimental results confirm that SADHPIS can achieve adjustable inertia with small space and low energy consumption.