Abstract: Classical on-off skyhook (SH) control and acceleration-driven damping (ADD) control have their own strong and weak points: the former has better control effects in low-frequency region (in the vicinity of offset frequency of body vibration) while the latter in high-frequency region (higher than offset frequency). For effectively reducing the vibration acceleration of vehicle in whole frequency range, a modified ADD control is proposed, which combines the advantages of both SH and ADD controls, and the above-mentioned control schemes are theoretically analyzed from the angle of phase frequency, verifying the advantage of the algorithm put forward. Finally, both MATLAB/Simulink simulation and hardware-in-the-loop test on a controllable shock absorber are conducted, validating the effectiveness of the algorithm in both time and frequency domains.

Key words: semi-active suspension, skyhook control, ADD control, whole frequency range