抄録
Vibration suppressors are used to change the natural frequency of an elevator rope and prevent resonance. The displacement of the parts of the elevator rope at both the ends is small compared to that of the center part of the rope; therefore, it is not necessary to position the vibration suppressors in the parts on either ends. In this paper, theoretical solution to the free vibration of the rope is obtained, in the case where vibration suppressors are located except for both ends part of the rope and the pulled position is (q-2(i-1))L/2N from both ends of the rope. The natural frequency is 2N/(N+1) times of the original natural frequency. And another theoretical solution is also obtained, in the case where the pulled position is pL/2N from both ends of the rope. The natural frequency is 2N/(N+p) times of the original natural frequency. Where L is rope length, p, q, N (=2p+q) and i are integer. Further, finite difference analysis of the rope vibration with vibration suppressors is also performed to obtain the frequency response curves. Resonance frequencies obtained by the finite difference analyses are in good agreement with the natural frequencies for the free vibration.
