The Control of Semi-Active Dampers Using Relative Feedback Signals

An algorithm has been developed for the control of semi-active dampers which uses the feedback of displacement and velocity signals measured across the damper. This algorithm has been called “relative control.” Experimental and computer simulation data show that the performance achieved with relative control can be superior to that of passive dampers. The motivation for examining this approach is that relative control can be implemented without electronics. Thus, an all-mechanical damper device, which in appearance looks identical to a conventional shock absorber, can be designed to implement relative control.