Active seat suspension for ultra-compact vehicles: experimental consideration on vibration control system using feedback of acceleration

抄録

An active seat suspension was proposed to improve ride comfort of the ultra-compact vehicle. Discomfort vibration for vehicle occupants was reduced by active control of the seat suspension. In previous studies, a control system of the seat suspension that feeds back the displacement and velocity of the seat surface was used. This system measures the acceleration in the vertical direction from an accelerometer mounted on the seat surface. The displacement and velocity from the equilibrium point were calculated by digital integration against acceleration. However, the error generated by digital integration may affect control performance. The ideal method for vibration control is feedback control using acceleration directly. In this study, a control system that directly feed back the absolute acceleration measured on the seat was proposed. To investigate the performance of vibration control, vibration response of this control system was measured using the experimental apparatus assumed the active seat suspension. In this experiment, vibration response of the model was investigated by input disturbance from a vibrator. Moreover, setting feedback gain is important factor for improving control performance. We investigated the change of the vibration suppression effect by the feedback gain to improve control performance. From experimental results, the ride comfort which applied acceleration feedback control could be improved by selecting proper feedback gain because characteristics of frequency was changed by the feedback gain.