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Experimental study of modal parameter identification in a simulated ambient-excited structure |
| JI Xiaodong, QIAN Jiaru, XU Longhe |
| Key Laboratory for Structural Engineering and Vibration of Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; |
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Abstract Structure modal parameter online identification was used to monitor the structural health as evidenced by changes in the vibration characteristics. The natural excitation technique and the eigensystem realization algorithm were combined to identify the modal parameters in the time domain of a structure excited by simulated ambient vibrations. The mass-normalized mode shapes were obtained from the eigen-sensitivity analysis. The experimental modal analysis was performed on a two-story steel braced frame model excited by simulated ambient vibrations and hammer impacts. The mass-normalized mode shapes were acquired by changing the structural mass and by eigen-sensitivity analy sis. From finite element analysis results and the experimental data, it is shown that this method is effective.
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Issue Date: 05 September 2007
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