| Summary: | In Japan, elevator cannot be used during an earthquake, and out-of-service hours tend to be long after large earthquake. It leads to difficulty in evacuation, rescue, and so on. Thus, it is important to suppress vibration of the whole elevator system during operation of an elevator in a vibrating building. In this paper, a vibration control method of compensation rope is proposed as a first step. Considering feedback control, responses are used to compute control force. However, response measurement or response estimation of the rope is too difficult to keep enough accurate. The proposed control method doesn’t require the rope response but elevator car position and acceleration. First, an analysis model is derived by a partial differential equation. Then, control methods based on time-varying natural frequencies of the rope are formulated. Finally, the effectiveness compared with constant tension cases is verified. Two car motions, upward motion and downward motion, are analyzed in a vibrating building. It is confirmed that vibration responses are suppressed by avoiding resonance condition. By contrast, as raising tension method cannot reduce the initial tension by compensation rope's own weight and a compensating sheave weight, the relation between the initial natural frequency of the rope and the frequency of external force effects the control performance.
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