An Energy Balanced Double Oscillator Model for Vortex-Induced Vibrations

S. Krenk, Søren R. K. Nielsen

    Publikation: Bog/antologi/afhandling/rapportBogForskning

    Abstract

    A model consisting of two couple oscillators is developed for the representation of vortex-induced oscillations of structural elements. The mutual forcing terms are different from previous models and based on exact transfer of energy from the fluid to the structural oscillator. This leads to a system with distinct frquency locking and resonance when fluid and structural natural frequencies are similar. The frequency for stationary oscillations has two distinct branches, giving two solutions in the lock-in frequency interval. A stability analysis shows that the final part of each branch is unstable, and a transient analysis illustrates the transition between the two modes of oscillation for slowly increasing or decreasing fluid velocity through the lock-in region. The model predicts decreasing amplitude and lowering of the upper lock-in frequency limit with increasing structural damping and with increasing structural mass.
    OriginalsprogEngelsk
    UdgivelsesstedAalborg
    ForlagDepartment of Mechanical Engineering, Aalborg University
    StatusUdgivet - 1996
    NavnEngineering Mechanics
    NummerPaper 28
    ISSN1395-7953

    Bibliografisk note

    Submitted to J. Engng. Mech.
    Submitted to J. Engng. Mech.

    Emneord

    • Oscillator Model
    • Vortex-Induced Vibrations

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