Wavelet-based analysis of time-variant adaptive structures

作者：Dziedziech Kajetan; Nowak Alexander; Hasse Alexander; Uhl Tadeusz; Staszewski Wieslaw J^*

来源：Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences, 2018, 376(2126): 20170245.

DOI：10.1098/rsta.2017.0245

• wavelets
• time-variant systems
• adaptive structures
• wavelet-based coherence
• wavelet-based frequency response function

Wavelet analysis is applied to identify the time-variant dynamics of adaptive structures. The wavelet-based power spectrum of the structural response, wavelet-based frequency response function (FRF) and wavelet-based coherence are used to identify continuously and abruptly varying natural frequencies. A cantilever plate with surface-bonded macro fibre composite-which alters the structural stiffness-is used to demonstrate the application of the methods. The results show that the wavelet-based input-output characteristics-i.e. the FRF and coherence-can identify correctly the dynamics of the analysed time-variant system and reveal the varying natural frequency. The wavelet-based coherence can be used not only for the assessment of the quality of the wavelet-based FRF but also for the identification.
This article is part of the theme issue 'Redundancy rules: the continuous wavelet transform comes of age'.

• 出版日期2018-8-13