Time Lag of Magnetorheological Damper Semi-active Suspensions

Abstract

Time delay causes unsynchronized controllable damping force of magnetorheological damper, which degrades the performance and stability of vehicle semi-active suspension, therefore time-delay problem is one of the hot spots of research on semi-active suspension. Based on the response characteristics of RD-1005-3 magnetorheological damper and the theoretical analysis of critical time delay of semi-active suspension, the mathematical model and the transfer function of magnetorheological semi-active suspension with time delay are established, and the effect of time delay on the amplitude frequency characteristics of suspension is analyzed. Through analyzing the numerical solution of critical time delay, theoretical basis is provided for the research on time-delay of control system of magnetorheological semi-active suspension. Based on fuzzy control strategy, Smith forecasting compensation control is used to carry out compensation of time delay for the system, and simulation analysis is carried out in Matlab. Bench test is carried out for the built single mass magnetorheological semi-active suspension system, and the data of simulation and test show that the time delay compensated system improves the performance of suspensions well.