A Study of Structural Damage Detection Using Wavelet Transform

• Main Authors: Chun-Jung Chen, 陳俊榮
• Other Authors: Dar-Yun Chiang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/57627926904094207238

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 96 === In this thesis, structural damage detection analysis is studied by means of wavelet transform. It offers an alternative and flexible way of providing time-frequency information when structural damage occurred in detecting time. In the process of damage detection, a two-step method combination with system identification technique is employed. The damaged visibility method could be distinct from noise and damaged signal during the structural damage occurred within the detecting time. A modification to the conventional mode shape curvature method combination with wavelet transform is proposed to improve the efficiency of wavelet detective method. As a result, the possibly damaged locations in a structure can reliably be located. Lastly, the damage extent of possibly damaged locations is then evaluated using the Lipschitz exponent. Numerical simulation results show that the proposed method is accurate under noisy conditions.