Elevator Rope Research Articles

Study on Free Vibration Test of Elevator Rope and Time History Response Analysis Method by Difference Method

Study on Free Vibration Test of Elevator Rope and Time History Response Analysis Method by Difference Method

Analysis of Rope Sway during Travel of Elevator

An elevator for a high-rise building ought to perform emergency operation when the elevator rope is oscillated by the sway of the building caused by wind force or long – period ground motion. In recent years, techniques for directly measuring rope amplitude in real time have been utilized. Thereby, it has become possible to perform apposite emergency operation based on the rope sway condition. On the other hand, the rope sway changes continuously every moment during the travel of elevator. Therefore, it is very important to grasp the changing tendency of rope sway for the efficient judgment of emergency operation. In this research, we constructed a simulation model which quantitatively simulates the rope sway motion during a travel of an elevator.

Vibration Analysis of Elevator Rope with Vibration Suppressors

Vibration Analysis of Elevator Rope with Vibration Suppressors

Development of Inspection Device for Elevator Rope Using Image Processing

Development of Inspection Device for Elevator Rope Using Image Processing

Vibration analysis of elevator rope with vibration suppressors (When vibration suppressors are uniformly installed or uniformly installed except for both ends part)

Vibration analysis of elevator rope with vibration suppressors (When vibration suppressors are uniformly installed or uniformly installed except for both ends part)

Vibration analysis of elevator rope with vibration suppressors

Vibration analysis of elevator rope with vibration suppressors

엘리베이터 로프의 동적 모델 검증을 위한 로프 진동 실험

In this paper, the vibration characteristic of elevator rope was verified. To this end, the dynamic model of elevator rope was derived using Rayleigh-Ritz method. And the numerical simulation was carried out for theoretical predictions. To calculate the response of elevator rope, the parameters of real elevator was considered. Based on numerical simulation, the vibration experiments were carried out to validate the dynamic model of elevator rope. To measure the vibration of elevator rope, the CCD camera and the line laser was considered. And the image processing technique was applied to calculate the horizontal displacement of elevator rope. Measurement equipment was installed in elevator shaft at 3 m, 29 m, and 51 m from the base level. Shaker was equipped at the bottom of elevator rope to excite the rope. In experiments, the displacement of rope was measured when the elevator rope was subjected to each natural frequencies. Experimental results are in good agreement with theoretical predictions.

Vibration analysis of elevator rope with vibration suppressors

Vibration analysis of elevator rope with vibration suppressors

Vibration analysis of elevator rope with one vibration suppressor

The lateral vibration of elevator ropes for high-rise building, which is excited forcibly by the displacements of the building induced by wind forces, is numerically analyzed, and a new practical method for reducing the rope vibration by using vibration suppressor is proposed for relaxing the restricted elevator operation. Finite difference analyses of the rope vibration with/without vibration suppressor are performed. The advantage of using the vibration suppressors for reducing the rope lateral vibration is demonstrated through the numerical calculation : The resonant position of the rope with vibration suppressor is greatly depends on the position of the vibration suppressor. When the vibration suppressors are uniformly installed along full length of the rope, the maximum rope deflection becomes smaller as the number of the vibration suppressor is made greater. It is also presented that the calculated results of reaction force from vibration suppressor are in fairly good agreement with experimental ones.

Forced vibration analysis of elevator rope with vibration suppressors

Forced vibration analysis of elevator rope with vibration suppressors

Free vibration analysis of elevator rope with vibration suppressors which located except for both ends part with gap from rope

Free vibration analysis of elevator rope with vibration suppressors which located except for both ends part with gap from rope

Forced vibration analysis of elevator rope with one vibration suppressor

Forced vibration analysis of elevator rope with one vibration suppressor

Passive Vibration Control of Elevator Rope Using Negative Stiffness and Damper

Passive Vibration Control of Elevator Rope Using Negative Stiffness and Damper

Vibration of a string against multiple spring-mass-damper stoppers

When a building sways due to strong wind or an earthquake, the elevator rope can undergo resonance, resulting in collision with the hoist-way wall. In this study, a hard stopper and a soft stopper comprised of a spring-mass-damper system installed along the hoist-way wall were considered to prevent the string from undergoing excessive vibrations. The collision of the string with multiple hard stoppers and multiple spring-mass-damper stoppers was investigated using an analytical method. The result revealed new formulas and computational algorithms that are suitable for simulating the vibration of the string against multiple stoppers. The numerical results show that the spring-mass-damper stopper is more effective in suppressing the vibrations of the string and reducing structural failure. The proposed algorithms were shown to be efficient to simulate the motion of the string against a vibration stopper.

両端部付近を除き変位拘束部材を有するエレベータ・ロープの自由振動

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 set the vibration suppressors in the parts on either ends. The elevator rope is generally modeled using a string, and linear string vibration is well researched. However, the vibration of the string equipped with vibration suppressors encounters geometric nonlinearity, and hence, its characteristics have been studied under a few conditions. Furthermore, in the case in which the vibration suppressor is located except for both ends part of the string, no exact solution has yet been obtained for the free vibration of the string. In this paper, an exact solution is presented for the free vibration of a string when the vibration suppressors are located except for both ends part of the string. In the analysis for determining the exact solution, the problem of free vibration with vibration suppressors is transposed to a problem of forced vibration. Further, to verify the validity of the exact solution, a finite difference analysis of the string vibration with vibration suppressors is performed. The calculated results obtained from the finite difference analysis are in good agreement with the results of the exact solution.

両端から全長の1/<i>N</i>の位置に変位拘束部材を有する弦の自由振動（<i>N</i>が奇数，弦と変位拘束部材との間にギャップがある場合）

In high-rise buildings, the elevator rope may resonate with the building's sway induced by wind forces and/or by long period ground motion. Therefore, suppression of elevator rope vibration is desired. In previous paper, an exact solution to the free vibration of the rope with vibration suppressors located at 1/N from both ends of the rope was presented in the case where the gap between rope and vibration suppressor was zero. However, in the case where N is an odd number and the gap between rope and vibration suppressor is not zero, no exact solution of the free vibration has yet been obtained. In this paper, an exact solution to the free vibration of this case (N is an odd number and gap between string and vibration suppressor is not zero) is presented, when the center position of the rope is pulled. The rope is modeled with string. Finite difference analyses of the rope vibration with vibration suppressor are also performed. The calculated results of the finite difference analyses are in good agreement with those of the exact solution.

Fundamental Study on Vibration Behaviour of Elevator Rope Using Intermediate Transfer Floor of High Rise Buildings

Fundamental Study on Vibration Behaviour of Elevator Rope Using Intermediate Transfer Floor of High Rise Buildings

Forced vibration analysis of elevator rope with vibration suppressors

Forced vibration analysis of elevator rope with vibration suppressors

両端部付近を除き変位拘束部材を有するエレベータ・ロープの自由振動

両端部付近を除き変位拘束部材を有するエレベータ・ロープの自由振動

Elevator Rope Tension Analysis with Rope Slip Behavior

Elevator Rope Tension Analysis with Rope Slip Behavior