A frequency and spatial domain decomposition method for operational strain modal analysis and its application
| Autor: | F. N. Catbas, Lingmi Zhang, Tong Wang, Ozan Celik |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
business.industry Modal analysis Modal analysis using FEM Mathematical analysis Modal testing Spectral density 020101 civil engineering 02 engineering and technology Structural engineering 0201 civil engineering Operational Modal Analysis 020303 mechanical engineering & transports Modal 0203 mechanical engineering Normal mode Singular value decomposition business Civil and Structural Engineering |
| Zdroj: | Engineering Structures. 114:104-112 |
| ISSN: | 0141-0296 |
| Popis: | Operational modal analysis (OMA), where only the responses are utilized, has been applied to various engineering problems more commonly due to its advantages in real life implementations. A frequency and spatial domain decomposition method for operational modal analysis making use of strain measurements is presented in this paper. With the proposed algorithm, accurate global characteristics of a structure can be obtained from only the measured strain responses. Singular value decomposition, power spectrum enhancement, and the least square fitting techniques are adopted to decouple and obtain the strain modes one by one. Strain modal analysis and acceleration modal analysis are conducted simultaneously to extract the modal parameters of a four-span bridge model with a pair of heavily coupled modes. The processes and the results are carefully compared with each other. Starting from the abnormal strain modes observed, the accidental change of a boundary condition of the bridge model is successfully detected, and also accurately located by the correlation calculation of strain mode shapes. |
| Databáze: | OpenAIRE |
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