Development of a full-scale magnetorheological damper model for open-loop cable vibration control

Ru Zhang , Yi-Qing Ni , Yuanfeng Duan , Jan-Ming Ko

Abstract

Modeling of magnetorheological (MR) dampers for cable vibration control to facilitate the design of even more effective and economical systems is still a challenging task. In this study, a parameter-adaptive three-element model is first established for a full-scale MR damper based on laboratory tests. The parameters of the model are represented by a set of empirical formulae in terms of displacement amplitude, voltage input, and excitation frequency. The model is then incorporated into the governing equation of cable-damper system for investigation of open-loop vibration control of stay cables in a cable-stayed bridge. The concept of optimal voltage/current input achieving the maximum damping for the system is put forward and verified. Multi-mode suboptimal and Single-mode optimal open-loop control method is then developed. Important conclusions are drawn on application issues and unique characteristics of open-loop cable vibration control using MR dampers.

Key Words

magnetorheological (MR) damper; vibration control; stay cable; open-loop control

Address

Ru Zhang — Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, P. R. China; College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, P. R. China
Yi-Qing Ni and Jan-Ming Ko — Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, P. R. China
Yuanfeng Duan — College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, P. R. China

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