Analysis and control of elevator ropes vibration in high-rise buildings

高層構造物におけるエレベータロープ振動の解析と制御

2019-09-25

2019-09-25

Increasing urbanization in recent years has led to increasing numbers of high-rise buildings and, with them, high-rise elevator. These elevators require the use of very long wire ropes. Due to the trend of using very long cable, the elevator system is becoming more susceptible to vibration caused by the vibration of building under external forces such as winds or earthquakes. Supporting vibration devices are always being developed to restrain the undesired vibration of elevator rope and to increase the serviceability level of elevator systems. This dissertation proposes a new method to control the vibration of the elevator rope with time-varying. The stability of the controller is analyzed by using Lyapunov theory. Moreover, the vibration of the elevator ropes, including main rope and compensation rope, are investigated simultaneously in a high-rise elevator system under earthquake excitations. This research considers varying rope lengths during elevator operation, which caused other system parameters such as natural frequency, damping ratio to be time-variant variables. The dynamics of the ropes are analyzed by solving the governing non-stationary, non-linear equation numerically. A Genetic Algorithm which minimizes the displacement of the ropes and optimizes the control parameters is introduced and applied to the high-rise elevator rope under earthquake excitations. The expected parameters are provided by the standard deviation method. By using the expected control parameters, the proposed method is applied to control the vibrations of both ropes under some cases of earthquakes which are different from the earthquakes in Genetic Algorithm process. The vibration of elevator ropes is considered in fours case of moving car, including upward motion, downward motion, at the highest location, at the lowest location. The proposed method is also applied to control the vibration of hoisting rope in another elevator system, which is known as a cable-guided hoisting system. The results of the simulation validate the effectiveness of the proposed control method for reducing the displacement responses of the ropes.

博士(工学)

京都工芸繊維大学

14303甲第935号

http://hdl.handle.net/10212/2545

eng

ETD

5

Thesis or Dissertation

Thesis