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Structural Engineering and Mechanics Volume 56, Number 3, November10 2015 , pages 423-442 DOI: https://doi.org/10.12989/sem.2015.56.3.423 |
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High-order, closely-spaced modal parameter estimation using wavelet analysis |
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Thai-Hoa Le and Luca Caracoglia
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| Abstract | ||
| This study examines the wavelet transform for output-only system identification of ambient excited engineering structures with emphasis on its utilization for modal parameter estimation of high-order and closely-spaced modes. Sophisticated time-frequency resolution analysis has been carried out by employing the modified complex Morlet wavelet function for better adaption and flexibility of the timefrequency resolution to extract two closely-spaced frequencies. Furthermore, bandwidth refinement techniques such as a bandwidth resolution adaptation, a broadband filtering technique and a narrowband filtering one have been proposed in the study for the special treatments of high-order and closely-spaced modal parameter estimation. Ambient responses of a 5-story steel frame building have been used in the numerical example, using the proposed bandwidth refinement techniques, for estimating the modal parameters of the high-order and closely-spaced modes. The first five natural frequencies and damping ratios of the structure have been estimated; furthermore, the comparison among the various proposed bandwidth refinement techniques has also been examined. | ||
| Key Words | ||
| output-only system identification; modal parameter estimation; wavelet transform; high-order and closely-spaced modes; steel building; time-frequency resolution analysis; narrowband filtering; broadband filtering | ||
| Address | ||
| Thai-Hoa Leand Luca Caracoglia1a: Department of Civil and Environmental Engineering, Northeastern University, 360 Huntington Ave., Boston, MA 02115, USA | ||