Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
Vibration suppressors are used to resolve the problem of collisions and entanglement to the hoistway equipment caused by the rope sway due to the resonance of the building and the elevator rope. Vibration suppressors have the effect of changing the natural frequency of the elevator rope and prevent resonance. In this paper, theoretical solution to the free vibration of the rope is obtained, in the case where two vibration suppressors are located at βL and (1-β)L, where L is rope length, β is an arbitrary value. Two types of initial rope displacement are considered: trapezoid-like displacement and triangle wave-like displacement. Obtained natural frequencies are 1/(1-β) times and 2/(1+β/3) times of the original natural frequency respectively. 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. Vibration modes obtained by the finite difference analyses are similar to that for the free vibration.
