Limit cycle periods in damage detection

This paper introduces a damage detection scheme based on changes in the period of limit cycles (LCs) realized by nonlinear output feedback. The parameterized feedback law is selected to make the dynamic equilibrium of the actuated coordinate approximate that of a generalized van der Pol oscillator a...

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Bibliographic Details
Published inMechanical systems and signal processing Vol. 162; p. 108037
Main Authors Bernal, D., Memarzadeh, E., Ulriksen, M.
Format Journal Article
LanguageEnglish
Published Berlin Elsevier Ltd 01.01.2022
Elsevier BV
Subjects
Actuators
Closed loops
Damage detection
Damage localization
Environmental effects
Output feedback
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Summary:This paper introduces a damage detection scheme based on changes in the period of limit cycles (LCs) realized by nonlinear output feedback. The parameterized feedback law is selected to make the dynamic equilibrium of the actuated coordinate approximate that of a generalized van der Pol oscillator and potential model-related difficulties are avoided by fixing the parameters from experimental results. It is found that not all sensor/actuator arrangements are suitable for generating a LC in closed loop, so a methodology to determine which arrangements are viable is presented. Numerical results show that LC periods are adequately stable with respect to noise and system changes from environmental effects and have sensitivity to localized damage that is often orders of magnitude larger than those of the modal frequencies.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2021.108037