High-frequency structural mode disturbance suppression in vehicle-mounted optoelectronic platform with semi-active control via threshold fuzzy algorithm

Abstract

Vehicle-mounted optical platforms are susceptible to imaging instability under broadband vibration environments. Semi-active control strategies, particularly those employing magnetorheological (MR) dampers, have been widely adopted to mitigate such effects. While MR dampers with semi-active algorithm are effective in suppressing large-amplitude excitations, frequent variations in damping force during control may excite high-frequency structural modes, thereby deteriorating imaging performance. To overcome this issue, a fuzzy skyhook control strategy with integrated threshold limitation and slope transition algorithm (TAS), is proposed. An auxiliary oscillator is introduced to emulate the real modal characteristics of the optical platform, and both forward and inverse models of the MR damper are developed for control implementation and comparative analysis. Results demonstrate that, relative to existing control strategies, the proposed TAS method not only effectively attenuates low-frequency, large-amplitude vibrations but also significantly reduces acceleration transmissibility around the high-frequency structural mode (45.1 Hz). Specifically, under road excitation across a range of vehicle speeds, TAS achieves at least a 40% reduction in transmissibility compared with conventional skyhook control.