Passive Control of Bridge Wind-Induced Instabilities by Tuned Mass Dampers and Movable Flaps
Publication: Journal of Engineering Mechanics
Volume 143, Issue 9
Abstract
This study investigates ways to passively suppress wind-induced instabilities such as flutter and torsional divergence. The control system design study is based on a sectional flexible bridge model interacting with a constant velocity airstream. Two strategies are considered, separately and in combination. The first makes use of trailing and leading flaps adjacent to the bridge deck, the motion of which is triggered by the deck’s movement through a combination of springs, dampers, and inerters at the hinged connection. Emphasis is placed on the effect of the flap hinge location and an optimization procedure is used for determining the compensator parameters that result in favorable aeroelastic properties. The second approach reexamines the efficacy and limitations of using tuned mass dampers (TMDs) placed inside the bridge deck for controlling self-excited motion. The paper then combines the two approaches and introduces a kinematic constraint between the masses of the TMD and the flaps. This combined mechanical system, the flap mass damper (FMD), combines favorable aerodynamic properties of the flaps with a driving force provided by the vibrating mass. Consequently it has the advantage of not requiring complex and often impractical linkages in order to transmit the deck motion to the flaps. Special attention is given to ensuring that the passive control system attains optimum robustness properties and maximizes tolerance to uncertainties. Uncertainties are quantified in a series of simulations showing how the alteration of the bridge’s natural frequencies affect the stability of the controlled system. The Humber Bridge in the United Kingdom is chosen as an example for the numerical simulations.
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Acknowledgments
This work was partially funded by the IKY-State Scholarship Foundation by means of the ESPA European fund 2007–2013 and supported by a Marie Curie Intra European Fellowship within the 7th European Community Framework Programme.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 23, 2015
Accepted: Feb 17, 2017
Published online: May 31, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 31, 2017
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