A study on countermeasures against wind-induced cable vibrations in cable-stayed bridge by changing vibration modes

3rd report, design method of a control device

Ryuji Nakano, Shigehiko Kaneko, Ryuta Katamura

Research output: Contribution to journalArticle

Abstract

In order to suppress vibrations of stay cables in cable-stayed bridges, the authors developed a new vibration reduction method called "Changing vibration modes method" using a permanent magnet. The authors have confirmed its effectiveness in former reports by both theoretical analyses and wind tunnel tests. In second report, the authors analyzed cable vibrations by taking account of only an unstable mode and clarified how the design parameters such as a gap and magnetic force affect the control efficiency. In this report, accuracy of the analysis is further improved by introducing the higher modes effects as an "equivalent aerodynamic damping". Then, a design procedure of the parameters is proposed on the basis of the improved analysis, and its validity is shown by wind tunnel test results.

Original languageEnglish
Pages (from-to)2225-2232
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume68
Issue number8
Publication statusPublished - 2002 Aug 1
Externally publishedYes

Fingerprint

Cable stayed bridges
Wind tunnels
Cables
Permanent magnets
Aerodynamics
Damping

Keywords

  • Cable-Stayed Bridge
  • Damping
  • Permanent Magnet
  • Self-Excited Vibration
  • Stay Cable
  • Vibration Control
  • Vibration Mode
  • Wind Tunnel Test

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "In order to suppress vibrations of stay cables in cable-stayed bridges, the authors developed a new vibration reduction method called {"}Changing vibration modes method{"} using a permanent magnet. The authors have confirmed its effectiveness in former reports by both theoretical analyses and wind tunnel tests. In second report, the authors analyzed cable vibrations by taking account of only an unstable mode and clarified how the design parameters such as a gap and magnetic force affect the control efficiency. In this report, accuracy of the analysis is further improved by introducing the higher modes effects as an {"}equivalent aerodynamic damping{"}. Then, a design procedure of the parameters is proposed on the basis of the improved analysis, and its validity is shown by wind tunnel test results.",
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AB - In order to suppress vibrations of stay cables in cable-stayed bridges, the authors developed a new vibration reduction method called "Changing vibration modes method" using a permanent magnet. The authors have confirmed its effectiveness in former reports by both theoretical analyses and wind tunnel tests. In second report, the authors analyzed cable vibrations by taking account of only an unstable mode and clarified how the design parameters such as a gap and magnetic force affect the control efficiency. In this report, accuracy of the analysis is further improved by introducing the higher modes effects as an "equivalent aerodynamic damping". Then, a design procedure of the parameters is proposed on the basis of the improved analysis, and its validity is shown by wind tunnel test results.

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