THE SECOND GENERATION WAVELETS-BASED DAMAGE IDENTIFICATION OF ON-LINE STRUCTURES
Most of vibration-based damage detection methods require the modal properties that are obtained from measured signals through the system identification techniques. However, the modal properties such as natural frequencies and mode shapes are not such a good sensitive indication of structural damage. The Second generation wavelet transform (SGWT) is a mathematical tool that has a special advantage over the traditional Fourier transform in analyzing non- stationary signals. SGWT is different from the classical wavelet transform not relying on Fourier transform, doing all calculation on time-domain, and constructing special property wavelet by designing predictor and updater. In another words, wavelet basis function with some special characteristic can be obtained by means of designing prediction and update coefficients, which will be useful for constructing different wavelet function for different civil engineering structural problems. A harmonic function was constructed to explain how to identification the damage of on-line structures using the SGWT. Through comparing the traditional wavelet transform with the SGWT for same signal; some useful conclusions were obtained which will be theoretical foundation for damage identification for structures. Which will be useful to propose a new damage index based the SGWT.
Jian-Gang Han Xiao-Xia Xu Wei-Xin Ren
Department of Civil Engineering, Hainan University, Haikou 570228, P.R. China Department of Civil Engineering, Fuzhou University, Fuzhou 350002, P.R. China Department of Civil Engineering, Central South University, Changsha 410075, P.R. China
国际会议
长沙
英文
441-446
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）