Modal-Parameter Identification from Ambient Vibration Data by the Poly-reference Least Squares Complex Frequency Domain Method
| Autor: | Ming-YiYao, 姚明逸 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 If a system is subjected to ambient vibration, it is difficult to measure the excitation data to be employed to implement modal identification. In this thesis, discusses how to use structural response data only in modal parameter identification. To achieve the simulation with ambient vibration, we use the white noise excitation to simulate the ambient vibration in this thesis. How to achieve effective identification, in this case, is also important. This thesis focuses on modal parameter identification in the frequency domain, and we mainly apply poly-reference least squares complex frequency domain method at ambient vibration situation. We introduce the real earthquake data to approximate real situation. On the other hand, the concept of the hypothetical system is introduced to make the identification method applicable to nonwhite excitation. We introduced two modal verification methods, the stabilization diagram and modal assurance criterion (MAC) to verify the identification result. Stabilization diagram is constructed by increasing the polynomial order of the frequency response function. The other method is calculating the correlation between the mode shape of the identification method and the exact mode shape to achieve the verification of the mode shape. According to the results of the numerical simulation, the proposed method has demonstrated the effectiveness of a system under the consideration of ambient vibration. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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