#5835. A directional continuous wavelet transform of mode shape for line-type damage detection in plate-type structures

July 2026publication date
Proposal available till 17-05-2025
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Journal’s subject area:
Control and Systems Engineering;
Electrical and Electronic Engineering;
Signal Processing;
Software;
Computer Vision and Pattern Recognition;
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Abstract:
Line-type damage is abundant in engineering structures that have been in service for a long time. Vibration-based nondestructive testing as a global method has been extensively used in structural damage identification. In this study, a two-dimensional directional continuous wavelet transform (2D-DCWT)-based damage identification algorithm using “Morlet2d” wavelet for line-type damage detection in plate structures is presented. An analytical long narrow notch-type damage model of simply-supported plates is proposed to evaluate line-type damage effect on plate vibration performance. Based on the proposed model, the biggest challenge in parameter selection of wavelet analysis is solved. The fundamental aspects of 2D-DCWT algorithm in term of notch location and orientation are assessed. A multi-mode shape fusion approach is presented to make the 2D-DCWT algorithm apply to the high-order mode shapes. A comparative study with isotropic “Mexcan-hat2d” wavelet-based damage identification is performed, and it demonstrates that the proposed 2D-DCWT algorithm is superior in noise immunity.
Keywords:
Continuous wavelet transform; Damage detection; Line-type damage; Plates; PZT; Scanning laser Doppler vibrometer

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