Vibration Characteristics of Wire-Rope in the High Speed Elevator. Numerical Analysis by the Difference Method.

Elevator ropes in high-rise buildings are forcibly excited by the displacement of the building induced by wind force. An approximate solution to the forced vibration of a rope with time-varying length and having linear damping is presented here. It is assumed that the rope tension and the moving velocity are constant, and that the damping coefficient of the rope is small. Virtual sources of waves which can be assigned to reflecting waves are used for obtaining the approximate solution. Finite difference analyses of rope vibration are also performed to verify the validity of this approximate solution. The calculated results of the finite difference analyses are in fairly good agreement with the calculated results of the approximate solution. The effects of moving velocity and damping factor on the maximum rope deflection are quantitatively made clear.

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“…Numerical analysis is performed by using the following difference equations (7), (8) , derived from Eq. (2).…”

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confidence: 99%

Vibration Analysis of Elevator Rope (2nd Report, Forced Vibration of Rope with Damping)

Kimura

Ito

Nakagawa

2008

JSDD

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“…This paper deals with the compensating rope which hung from the cage. Numerical analysis is performed by using the following difference equations (6), 7, (10) , derived from Eq. (1).…”

Section: Journal Of System Design and Dynamicsmentioning

confidence: 99%

Simplified Calculation Method for Detecting Elevator Rope Deflection during Earthquake (Considering the Distribution of Rope Tension)

Kimura

Kuguminato

2013

JSDD

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When an elevator rope for a high-rise building is forcibly excited by long-period ground motion, rope displacement becomes large even if the ground acceleration is small. Therefore, detecting the rope sway in real time is important to avoid damage during and after earthquakes. In a previous paper, when elevator cage is moving, a simplified calculation method, based on a single-degree-of-freedom (SDOF) system, for estimating rope displacement during an earthquake by using the building acceleration and ground acceleration has been presented. This simplified calculation method is applied to main rope, which resonates only once with building's sway while the elevator is moving. In the case of the main rope, the results of this simplified calculation method agree with those of the conventional finite difference method (FDM), within the 20% error margin. In this paper, a simplified calculation method is applied to compensating rope, which resonates twice with building's sway while the elevator is moving, by considering distribution of the rope tension. Finite difference analyses of rope vibration are also performed to verify the validity of the simplified calculation method. The results of this simplified calculation method agree with those of the conventional finite difference method, within the +20%,-30% error margin.

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“…Numerical analysis is performed by using the following difference equation (2) , derived from Eq. (1).…”

Section: Fundamental Equationsmentioning

confidence: 99%

Vibration Analysis of Elevator Rope with Vibration Suppressor

Kimura

Nakagawa

2007

JEE

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

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Vibration Characteristics of Wire-Rope in the High Speed Elevator. Numerical Analysis by the Difference Method.

Cited by 10 publications

References 0 publications

Vibration Analysis of Elevator Rope (2nd Report, Forced Vibration of Rope with Damping)

Vibration Analysis of Elevator Rope (2nd Report, Forced Vibration of Rope with Damping)

Simplified Calculation Method for Detecting Elevator Rope Deflection during Earthquake (Considering the Distribution of Rope Tension)

Vibration Analysis of Elevator Rope with Vibration Suppressor

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