Experimental and analytical investigation of a fluttering bridge section model

Zsolt Szabó, Gábor Stépán, Ambrus Zelei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flutter instability is a typical aerodynamic vibration phenomenon of slender elastic bridges. The sensitivity for flutter can be predicted by determining the so-called nutter derivatives from the small-scale model of the bridge. This work investigates an elastic supported two d.o.f. bridge section model which can move vertically and rotate around a horizontal axis. These movements correspond to the bending and torsional vibrations of the bridge. The linearised equations of motion is assumed to be known, thus, the aerodynamic forces can be determined from wind-tunnel experiments. These forces are assumed as linear functions of the generalised coordinates and their time-derivatives. The coefficients of the linear terms called also as flutter derivatives depend on the flow (wind) velocity. These coefficients are to be determined by the Monte Carlo method using the measured acceleration data. The obtained results are compared to the results determined by curve-fitting on the acceleration time-signal. The original (structural) damping and stiffness matrices can be modified by using the flutter derivatives since the equations of motion form a homogeneous linear differential equation system. Thus, we get effective damping and stiffness matrices. Flutter instability occurs when a harmonic solution satisfies the equations. The critical flow velocity which the system loses its stability at is also compared to the stability boundary of the analytical model based on Theodorsen's approach.

Original languageEnglish
Title of host publication21st International Congress on Sound and Vibration 2014, ICSV 2014
PublisherInternational Institute of Acoustics and Vibrations
Pages2663-2670
Number of pages8
ISBN (Electronic)9781634392389
Publication statusPublished - Jan 1 2014
Event21st International Congress on Sound and Vibration 2014, ICSV 2014 - Beijing, China
Duration: Jul 13 2014Jul 17 2014

Publication series

Name21st International Congress on Sound and Vibration 2014, ICSV 2014
Volume3

Other

Other21st International Congress on Sound and Vibration 2014, ICSV 2014
CountryChina
CityBeijing
Period7/13/147/17/14

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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  • Cite this

    Szabó, Z., Stépán, G., & Zelei, A. (2014). Experimental and analytical investigation of a fluttering bridge section model. In 21st International Congress on Sound and Vibration 2014, ICSV 2014 (pp. 2663-2670). (21st International Congress on Sound and Vibration 2014, ICSV 2014; Vol. 3). International Institute of Acoustics and Vibrations.