Smart Structures and Systems

  • 제23권6호
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  • Pages.537-551
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  • 2019
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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Design formulas for vibration control of sagged cables using passive MR dampers

  • Duan, Yuanfeng (Department of Civil Engineering, College of Civil Engineering and Architecture, Zhejiang University) ;
  • Ni, Yi-Qing (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Zhang, Hongmei (Department of Civil Engineering, College of Civil Engineering and Architecture, Zhejiang University) ;
  • Spencer, Billie F. Jr. (Department of Civil and Environmental Engineering, The University of Illinois at Urbana-Champaign) ;
  • Ko, Jan-Ming (Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University) ;
  • Dong, Shenghao (Department of Civil Engineering, College of Civil Engineering and Architecture, Zhejiang University)
  • 투고 : 2018.08.12
  • 심사 : 2018.12.30
  • 발행 : 2019.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this paper, a method for analyzing the damping performance of stay cables incorporating magnetorheological (MR) dampers in the passive control mode is developed taking into account the cable sag and inclination, the damper coefficient, stiffness and mass, and the stiffness of damper support. Both numerical and asymptotic solutions are obtained from complex modal analysis. With the asymptotic solution, analytical formulas that evaluate the equivalent damping ratio of the sagged cable-damper system in consideration of all the above parameters are derived. The main thrust of the present study is to develop an general design formula and a universal curve for the optimal design of MR dampers for adjustable passive control of sagged cables. Two sag-affecting coefficients are derived to reflect the effects of cable sag on the maximum attainable damping ratio and the optimal damper coefficient. For the cable configurations commonly used in cable-stayed bridges, the sag-affecting coefficients are directly expressed in terms of the sag-extensibility parameter to facilitate the control design. A case study on adjustable passive vibration control of the longest cable (536 m) on Stonecutters Bridge is carried out to demonstrate the influence of the sag for the damper design, and to figure out the necessity of adjustability of damper coefficients for achieving maximum damping ratio for different vibration modes.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China, Ministry of Science and Technology of China, Council of the Hong Kong Special Administrative Region, Hong Kong Polytechnic University

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