Damage Detection of Beam by Spatial Wavelet Based Approach

空間小波分析於樑損傷探測上之研究

張智傑(Chih-Chieh Chang)

《機械技師學刊》 4卷1期 (2011/03) Pp. 1-3

https://doi.org/10.6208/JPME-2011-01-01

摘要

小波分析具有良好的的解析能力，而結構的損傷會造成結構位移訊號上的微小擾動，靠著小波分析可以擷取出這個微小的擾動，所以本研究利用小波來作樑結構的損傷偵測上之應用，樑結構的損傷乃是以降低的楊氏係數值來表示，結果顯示小波分析對損傷的程度都有很高的靈敏度，即使損傷程度很小的損傷也能發現損傷的位置。

關鍵字

小波 ； 破損探測

並列摘要

This paper presents a technique for structure damage detection based on spatial wavelet analysis. Many damage detection methods require modal properties before and after damage. This method only needs the spatially distributed signals (e.g. the displacements) of the beam after damage. First, spatially distributed signals of the beam with damage are obtained by finite element method. The damaged region is represented as the elements with reduced stiffness. Then these spatially distributed signals are analyzed by wavelet transformation. It is observed that distributions of the wavelet coefficients can identify the damage position of beam by showing a peak at the position of the damage. It is also demonstrated that this method is very sensitivity to the damage size.

並列關鍵字

spatial wavelet ； damage, beam