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Structural Engineering and Mechanics Volume 68, Number 1, October10 2018 , pages 039-51 DOI: https://doi.org/10.12989/sem.2018.68.1.039 |
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A structural model updating method using incomplete power spectral density function and modal data |
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Akbar Esfandiari, Maryam Ghareh Chaei and Fayaz R. Rofooei
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| Abstract | ||
| In this study, a frequency domain model updating method is presented using power spectral density (PSD) data. It uses the sensitivity of PSD function with respect to the unknown structural parameters through a decomposed form of transfer function. The stiffness parameters are captured with high accuracy through solving the sensitivity equations utilizing the least square approach. Using numerically noise polluted data, the model updating results of a truss model prove robustness of the method against measurement and mass modelling errors. Results prove the capabilities of the method for parameter estimation using highly noise polluted data of low ranges of excitation frequency. | ||
| Key Words | ||
| power spectral density; model updating; frequency response function; sensitivity-based model updating; modal data | ||
| Address | ||
| Akbar Esfandiari and Fayaz R. Rofooei: Department of Civil Engineering, Sharif University of Technology, Tehran, Iran Maryam Ghareh Chaei: Department of Marine Technology, Amirkabir University of Technology, Tehran, Iran | ||