| 摘要 |
<p>A rope type elevator comprises a car vertically movably arranged in a hoistway, a sheave arranged in an upper portion of the hoistway, a rope passing around the sheave for drawing the car up and down, a suspension rod supported by the rope, a spring (15) interposed between the suspension rod and the car for cushioning vibration, a cylinder device (16) for attenuating vibration and having a flow control valve (22), a car position detector (24) for detecting a position of the car to calculate a length of the rope, a load detector (25) for detecting a load applied to the car, and a control circuit (23) for calculating a characteristic frequency f of the rope from the length of the rope, and calculating a characteristic frequency fN of the spring from the load of the car, then calculating a frequency ratio u (u = f/fN) so that, when u = 1 or u ≒ 1, the flow control valve of said cylinder device is closed. <IMAGE></p> |
