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Active Control Of Flow-induced Vibration
K. Venkatraman
Published in
1993
Volume: 162
   
Issue: 1
Pages: 43 - 55
Abstract
The active control of flow-induced oscillations, specifically, vortex-induced oscillations of circular cylinders and galloping oscillations of circular cylinders and galloping oscillations of a square prism, are considered. In the case of vortex-induced oscillations, the vibrating cylinder is modeled as a single-degree-of-freedom (sdof) linear damped oscillator and the fluid motion as a Rayleigh oscillator. Galloping oscillations are modeled as a sdof limit-cycle system with cubic and higher order non-linearities in the velocity term. In formulating the control method it is assumed that the fluid interaction is an external excitation/disturbance on the structure. A suitable disturbance model is chosen based on the spectral content of the disturbance. For the problems considered here, the disturbance model assumes the form of a harmonic oscillator the frequency of which, in the case of vortex-induced oscillations, is equal to the natural frequency of the structure or the "lock-in" frequency, and in the case of galloping oscillations, is equal to the limit-cycle frequency. A disturbance counteracting control law is synthesized by using a Luenberger observer incorporating the structure and disturbance dynamics. It is shown that using this approach one is able to completely suppress the fluid-induced oscillations of the structure. © 1993 Academic Press. All rights reserved.
About the journal
JournalJournal of Sound and Vibration
ISSN0022460X
Open AccessNo
Concepts (18)
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    Control system synthesis
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    Degrees of freedom (mechanics)
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    Mathematical models
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    Oscillators (mechanical)
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    Perturbation techniques
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    Vibration control
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    Vibrations (mechanical)
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    ACTIVE VIBRATION CONTROL SYSTEMS
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    FLOW-INDUCED VIBRATIONS
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    GALLOPING OSCILLATIONS
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    Harmonic oscillators
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    LIMIT-CYCLE SYSTEMS
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    LINEAR DAMPED OSCILLATORS
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    Luenberger observer
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    PERTURBATION MODELS
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    RAYLEIGH OSCILLATORS
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    VORTEX-INDUCED OSCILLATIONS
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    Fluid structure interaction