TY - JOUR ID - 16032 TI - Measuring Crack-type Damage Features in Thin-walled ‎Composite Beams using De-noising and a 2D Continuous Wavelet ‎Transform of Mode Shapes JO - Journal of Applied and Computational Mechanics JA - JACM LA - en SN - AU - Pacheco-Chérrez, Josué AU - Cárdenas, Diego AU - Probst, Oliver AD - Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico‎ AD - Tecnologico de Monterrey, School of Engineering and Sciences, General Ramón Corona 2514, CP 45138, Zapopan, Mexico‎ AD - Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico Y1 - 2021 PY - 2021 VL - 7 IS - 1 SP - 355 EP - 371 KW - modal analysis KW - damage detection KW - damage assessment KW - 2D curve fitting‎ DO - 10.22055/jacm.2020.35156.2580 N2 - 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. UR - https://jacm.scu.ac.ir/article_16032.html L1 - https://jacm.scu.ac.ir/article_16032_9c33c1e1db1f0e63ddc82a6131823cdd.pdf ER -