Crack Detection in Rotating Cantilever Beam by Continuous Wavelet Transform

摘要

This paper presents a methodology for detection of size and location of open edge transverse crack on a rotating beam using continuous wavelength transform. Generally, vibration characteristic of a beam like structure changes significantly due to the presence of crack. However when the crack is relatively small, it is difficult to identify the presence of the crack from the vibration response data only. In the present case, vibration parameter, such as, mode shapes of damaged beams are obtained using the finite element method. The continuous wavelet transform is implemented with different scales on mode shape of the rotating beam to evaluate crack size and its location. It is also shown that this method can produce satisfactory results with some limitation based on mode shape profile. In addition to the profile quality, other determining factors are scale and resolution of the detection signal.