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Investigations on precursor measures for aeroelastic flutter
Published in Academic Press
2018
Volume: 419
   
Pages: 318 - 336
Abstract
Wind tunnel experiments carried out on a pitch-plunge aeroelastic system in the presence of fluctuating flows reveal that flutter instability is presaged by a regime of intermittency. It is observed that as the flow speed gradually increases towards the flutter speed, there appears intermittent bursts of periodic oscillations which become more frequent as the wind speed increases and eventually the dynamics transition into fully developed limit cycle oscillations, marking the onset of flutter. The signature from these intermittent oscillations are exploited to develop measures that forewarn a transition to flutter and can serve as precursors. This study investigates a suite of measures that are obtained directly from the time history of measurements and are hence model independent. The dependence of these precursors on the size of the measured data set and the time required for their computation is investigated. These measures can be useful in structural health monitoring of aeroelastic structures. © 2018 Elsevier Ltd
About the journal
JournalJournal of Sound and Vibration
PublisherAcademic Press
ISSN0022460X
Open AccessNo
Concepts (11)
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    Aeroelasticity
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    Entropy
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    Flutter (aerodynamics)
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    Wind
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    Wind tunnels
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    AEROELASTIC FLUTTER
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    APPROXIMATE ENTROPY
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    Intermittency
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    LEMPEL ZIV COMPLEXITY
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    SAMPLE ENTROPY
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    Structural health monitoring