Investigation on the dynamic performance of a new semi-active hydro-pneumatic inerter-based suspension system with MPC control strategy

This study presents the nonlinear modeling and model predictive control of a new semiactive hydro-pneumatic inerter-based suspension system (SAHPISS) for the first time. Unlike the traditional semi-active hydro-pneumatic suspension, a fluid inerter is added to the semi-active hydro-pneumatic suspension and a better damping effect can be achieved by adjusting the opening of the hydraulic control valve. First, an accurate analysis modeling of SAHPISS that considers the fluid hydraulic pressure drop, oil-gas nonlinearity and inerter nonlinearity is carried out. Then, a two-stage hierarchical control scheme based on MPC control strategy is proposed for SAHPISS to reduce calculation times of the system and the use rate of the hydraulic control valve and improve the working life of the hydraulic control valve under the consideration of suspension performance requirements. The results of the numerical simulations and experiments prove that the proposed new structure optimizes the low-frequency effect, has a high-frequency effect of the semi-active hydro-pneumatic suspension and verify the effectiveness of the control method. (C) 2020 Elsevier Ltd. All rights reserved.