Unsupervised identification of arbitrarily-damped structures using time-scale independent component analysis: Part I
- 73 Downloads
In this study, a new method is proposed to identify the dynamic parameters of structures with higher accuracy compared to current methods. First, the wavelet-transformed representation of system responses is extracted from measured responses, and then the independent component analysis is used to achieve the modal characteristics. The simulation results of a multi-degree-of-freedom system illustrate that this method is capable of accurately identifying the modal information of lightly- and highly-damped structures. It is represented that continuous wavelet transform, due to its adaptive time-frequency resolution, is more efficient to be incorporated into independent component analysis compared to Short time Fourier transform (STFT). The latter is unable to accurately determine the modal response, especially at higher frequencies, while the proposed method can identify the system with marked accuracy. The efficiency of proposed method is also investigated under additive noise. Results shown that for highly- and lightly- damped system, the proposed method is able to capture the modal parameters especially in higher frequencies of vibration, along with the modal assurance criterion values with satisfactory accuracy, which indicates the robustness of the procedure compared to other available methodologies.
KeywordsIndependent component analysis Seismic responses Wavelet transform Unsupervised identification
Unable to display preview. Download preview PDF.
- A. Farzampour and A. Kamali Asl, Performance of tuned mass dampers in vibration response control of base-excited structures, Journal of Civil, Construction and Environmental Engineering, 2 (3) (2017) 87–94.Google Scholar
- A. A. Farzampour and M. Yekrangnia, On the behavior of corrugated steel shear walls with and without openings, Second European Conference on Earthquake Engineering (2014).Google Scholar
- J. Seo and J. W. Hu, Seismic response and performance evaluation of self-centering LRB isolators installed on the CBF building under NF ground motions, Sustainability, 8 (109) (2016).Google Scholar
- S. I. McNeill, Modal identification using blind source separation techniques, Ph.D. Thesis, Rice University, Houston, Texas, USA (2007).Google Scholar
- B. Hazra and S. Narasimhan, Wavelet-based blind identification of the UCLA factor building using ambient and earthquake responses, Smart Materials and Structures, 19 (2010) 10.Google Scholar
- C. Zang, M. I. Friswell and M. Imregun, Decomposition of time domain vibration signals using the independent component analysis technique, 3rd International Conference on Identification in Engineering Systems, Swansea, UK (2002).Google Scholar
- A. Hyvarinen, FastICA [Computer software], Helsinki, Finland, Helsinki Univ. of Technology.Google Scholar
- A. K. Chopra, Dynamic of structures: Theory and applications to earthquake engineering, Prentice Hall (2011).Google Scholar