Passive control systems for reducing hangers wind induced vibrations
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The current trend toward lighter and slender pedestrian structures, with new aesthetic requirements and high-performance materials, has resulted in structures with increased susceptibility to vibration. Notable vibrations under human-induced excitations might appear, and the vibration serviceability requirements might not be accomplished. The Valladolid Science Museum Footbridge (Spain) is an example of a lively structure that might achieve excessive vertical acceleration under walking or running excitation. The control of excessive footbridge vibrations via passive and active devices is dealt with in this work. More specifically, this paper is concerned with the design and experimental implementation of a passive tuned mass damper (TMD) and an active mass damper (AMD) to mitigate human-induced vibrations on this in-service footbridge. The TMD, with a mass ratio of 1%, is designed by a numerical method based on H∞ controllers. The AMD consists of a proof-mass actuator, with a mass ratio of approximately 0.2%, controlled by a strategy based on acceleration feedback with a phase-lag network. The performance of both devices has been assessed. Copyright © 2011 John Wiley & Sons, Ltd.
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Stay cable is one of the main components of cable stayed bridge to bear loads. Due to its large flexibility, small quality and small damping, various of harmful vibrations could happen easily under the external excitations. Rain-wind-induced vibration is the strongest form of vibrations. Through the establishment of Dof theoretical model of rain-wind-induced vibration and the analysis of vibration frequency and aerodynamic damping of cable, the occurrence mechanism of rain-wind-induced vibration is revealed. The vibration control measures for this kind of vibration are also established to support the ensurance of bridge operation.
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