Research on effects of the vibration energy harvesting and intelligent control strategies on performance enhancement of semi-active hydro-pneumatic suspension system

The method of integrating vibration energy harvesting with intelligent control of suspension has the characteristics of high energy efficiency and strong controllability, which holds promising application prospects in the research and development of high-performance suspension. In this paper, a novel self-powered mechanism and intelligent control strategies for semi-active hydro-pneumatic suspension (HPS) are proposed, and a numerical study of the effects on performance enhancement is analyzed and discussed. Firstly, the performance of the designed self-powered mechanism was simulated and studied, the results show that the designed self-powered mechanism can generate maximum about 0.88 W of electric power at one second with the excitation frequency of 10 Hz. Then, a nonlinear model of 1/4 vehicle with the oscillating-cylinder HPS is established and test verification. Finally, the control effects of the proposed self-powered semi-active HPS with four control strategies under random road input conditions were quantitatively compared and analyzed based on numerical simulation, and the skyhook control demonstrated significant reductions in vehicle body acceleration with RMS reductions of 27.28%, 22.69%, and 18.61% at speeds of 10 m/s, 20 m/s, and 30 m/s, respectively, which effectively enhance the vehicle suspension performance.