Measuring Crack-type Damage Features in Thin-walled ‎Composite Beams using De-noising and a 2D Continuous Wavelet ‎Transform of Mode Shapes

Document Type : Research Paper


1 Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico‎

2 Tecnologico de Monterrey, School of Engineering and Sciences, General Ramón Corona 2514, CP 45138, Zapopan, Mexico‎

3 Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico


A new method is described, allowing to locate and also measure the length and orientation of crack-type damage features in thin-walled composite beams (TWCB), a capability not previously reported. The method is based on a modal-analysis technique and is shown to work on a hollow composite beam, going beyond previous work limited to simple beams and plates. The method is shown to be capable to function down to signal-to-noise ratios (SNR) of about 15, corresponding to far noisier conditions than in most previous work. This capability is achieved by a combination of wavelet de-noising and the use of a 2D Continuous Wavelet Transform (CWT), applied to two modal analysis metrics, COMAC and Mode Shape Differences (MSD). The length and orientation of the crack can be determined accurately using a 2D curve fitting approach. Using either COMAC or MSD produces reliable results, but MSD is found to be somewhat more noise-tolerant. The new method is believed to be useful for the measurement of damage features in a variety of thin-walled composite beams such as aircraft wings and wind turbine blades, among others.


Main Subjects

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