Acceleration feedback control strategy for improving riding quality of elevator system

In this paper, a new vertical vibration control strategy is proposed for improving riding quality of the elevator using car acceleration feedback control. The vertical vibration control of a lift car is difficult because it is mainly caused by the resonance of elastic ropes between the car and the sheave, and the resonance frequency of the system is largely dependent upon both passenger load and car position. To suppress the vibration of a lift car effectively, a simple and effective vibration-suppression algorithm is presented using an actual acceleration signal feedback. The proposed method employs a speed controller incorporating an acceleration feedback controller. Experimental verification has been carried out with a medium-speed elevator system at the elevator test tower. Computer simulation and experimental results show the feasibility of the proposed vertical vibration controller