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文件名称:【2013】小波变换移动载荷损伤识别.pdf
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更新时间:2022-06-16 06:55:26
损伤识别
Early damage detection on structures plays a very important role for ensuring safety and
reliability. This paper provides an efficient method based on wavelet transforms in order to detect and
localize damage on structures subjected to moving loads such as beams and bridges. A numerical model
based on the experimental test-rig utilized in this study is developed by using a finite element commercial
software. Different types of damage on the bridge of the numerical model are simulated and transient
analyses are performed by incorporating a load which moves constantly along the beam nodes. Continuous
wavelet transform diagrams using the vertical acceleration responses show that damage can be identified
and localized even with significant percentages of noise. Nevertheless, the method is improved by filtering
the signals, removing the border effects, and calculating the total wavelet energy of the beam from the
coefficients along the selected range of scales. Thus, the accumulation of wavelet energy could indicate
the presence of damage. Finally, laboratory experiments are conducted to validate this work and a good
agreement between numerical and experimental results is obtained.