Avoiding Resonance between Building Sway and Elevator Rope Based on Negative Stiffness

Abstract

The paper proposes a vibration suppression method of elevator-rope-sway by avoiding resonance between the building sway and the elevator rope based on a negative stiffness spring mounted near a bottom end of the rope. The negative stiffness can change the natural frequency of the rope. As a result, the resonance between the building sway and the elevator rope can be avoided. This paper describes the design and analysis of the negative stiffness in a passive vibration suppression device by using a transfer function of a wave equation which is described as a partial differential equation. The validity of the proposed method is confirmed by experiments.