Modal-Parameter Identification Using Continuous Wavelet Transform
碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 95 === This thesis presents a technique for modal-parameter identification based on continuous wavelet transformation. Through adequate processing methods, the stationary ambient vibration data is transformed approximately to the free vibration of the analyzed syst...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/71840292622363905086 |
| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 95 === This thesis presents a technique for modal-parameter identification based on continuous wavelet transformation. Through adequate processing methods, the stationary ambient vibration data is transformed approximately to the free vibration of the analyzed system. The modal-parameter of the system (including natural frequencies, damping ratios and mode shapes) are then identified from the ridges in the time-frequency spectrum obtained by the wavelet analysis. As the modal parameters are identified from the ridges, and the close modes will interfere with each other and affect the result of modal identification. The modal-parameter identification based on the continuous wavelet transformation of proposed systematic method and close modes caused by the identification of problems for solutions. Through numerical simulations, applicability and effectiveness of the proposed wavelet-based method of modal parameter identification from vibration data is demonstrated.
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