Zhao, X., Gouder, K., Graham, J. M. R. and Limebeer, D. J. N. (2016) Buffet loading, dynamic response and aerodynamic control of a suspension bridge in a turbulent wind. Journal of Fluids and Structures, 62 . pp. 384-412. doi:10.1016/j.jfluidstructs.2016.01.013

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Abstract

This paper describes experiments relating to the buffet response and control of a section of a long-span suspension bridge deck elastically mounted as part of a wind tunnel experiment. The bridge section is subject to grid generated flow turbulence. Two grids are used — one is a standard biplanar grid, while the second is a new design that provides larger turbulence length scales. The buffet response results are compared with admittances calculated using unsteady, three-dimensional, lifting-surface theory that extends standard two-dimensional Sears' theory. The bridge deck heave and pitch responses are predicted with comparisons made with wind tunnel measurements. In order to suppress buffeting, and increase the deck's critical flutter speed, the deck model is fitted with controllable leading- and trailing-edge flaps. Two sets of passive controllers, which use the flap angles as the control inputs, are demonstrated and evaluated for their capability to suppress the buffet response of the deck and increase its critical flutter speed. The first set of controllers sense the deck's position (pitch angle and heave, or pitch angle alone), whilst the second set (which are mechanical controllers) sense the vertical velocity of the flap hinge points. The control system design problem is solved as a mixed H2/H∞ optimisation problem. The wind tunnel experiments show that these control systems can reduce considerably the deck's buffet response, whilst simultaneously increasing its critical flutter speed.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TG Bridge engineering T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	Journal of Fluids and Structures
Publisher:	Elsevier
ISSN:	0889-9746
Official Date:	April 2016
Dates:	Date Event April 2016 Published 17 March 2016 Available 25 January 2016 Accepted 21 January 2015 Submitted
Volume:	62
Page Range:	pp. 384-412
DOI:	10.1016/j.jfluidstructs.2016.01.013
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Related URLs:	Publisher

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