Active aerodynamic stabilisation of long suspension bridges

Henrik Ditlev Nissen, Paul Haase Sørensen, Ole Erik Jannerup

    Research output: Contribution to journalJournal articleResearchpeer-review


    The paper describes the addition of actively controlled appendages (flaps) attached along the length of the bridge deck to dampen wind-induced oscillations in long suppension bridges. A novel approach using control systems methods for the analysis of dynamic stability is presented. In order to make use of control analysis and design techniques, a linear model of the structural and aerodynamic motion around equilibriun is developed. The model is validated through comparison with finite element calculations and wind tunnel experimental data on the Great Belt East Bridge in Denmark. The developed active control scheme is local in that the flap control signal at a given longitudinal position along the bridge only depends on local motion measurements. The analysis makes use of the Nyquist stability criteria and an anlysis of the sensitivity function for stability analysis. The analysis shows that the critical wind speed for flutter instability and divergence is increased substantially by active control.
    Original languageEnglish
    JournalJournal of Wind Engineering & Industrial Aerodynamics
    Issue number10
    Pages (from-to)829-847
    Publication statusPublished - 2004


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