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Abstract: The
nature frequencies of the cantilever beams with various crack locations
and depths are accurately obtained by means of wavelet finite element
methods, and then the surface-fitting technique is employed to plot the
surfaces of nature frequency. Measured natural frequencies are used in a
crack detection process and the crack location and size can be
identified through finding the point of intersection of three frequency
contour lines. The experimental results verify the validity of the
method, which provides a powerful evidence for practical application.
Key
words: Crack
Identification Wavelet finite element Nature frequency
CLC No: O242
TH17
国家自然科学基金(50335030, 50305012)、高校博士点基金(20040698026)和西安交通大学自然科学基金资助项目.
Received 20040916, received in revised form 20041224
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