Study on vibration characteristics of elevator ropes by elemental test

(Test results for each effect factors on damping ratio and analysis of effect factors by FEM)

Abstract

Recently, the buildings became taller. Elevator ropes also become longer. The natural period of the elevator rope become closer to that of the building. As a result, the elevator rope may sway intensely when the building receives an external force such as a strong wind and an earthquake. Furthermore the rope may hook to the equipment in the hoistway. The elevator rope with not easily sway is necessary. In this study, we conduct free vibration tests with an element testing equipment and analysis to investigate the relationship between effect factors and damping ratio. Based on the results, we develop a method for estimating rope with higher damping ratio and plan the improvement of the response analysis. In this paper, we conducted free vibration tests with ropes of different rope cores, with or without plating, and configurations. As a result, the main effect factor on damping ratio may be the rope core. We conducted FEM analysis to examine the rope core more. As a result, the friction between the core and strand is likely to have a large effect on the damping ratio.