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Effects of excitation frequency on detection accuracy of orthogonal wavelet decomposition for structural health monitoring |
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| Authors: | Raul J. Alonso Mohammad Noori Soheil Saadat Arata Masuda Zhikun Hou |
| Affiliation: | 1. Mechanical Engineering & Electro Optical Systems-MS 368, 1362 Brass Mill Road, Belcamp, MD,21017, USA 2. Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910, USA 3. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan 4. Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA |
| Abstract: | Accurate estimation of stiffness loss is a challenging problem in structural health monitoring. In this study orthogonal wavelet decomposition is used for identifying the stiffness loss in a single degree of freedom spring-mass-damper system. The effects of excitation frequency on accuracy of damage detection is investigated. Results show that pseudo-alias effects caused by the orthogonal wavelet decomposition (OWD), affect damage detectability. It is demonstrated that the proposed approach is suitable for damage detection when the excitation frequency is relatively low. This study shows how a priori knowledge about the signal and ability to control the sampling frequency can enhance damage detectability. |
| Keywords: | wavelet analysis damage detection structural health monitoring |
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