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Detection of sudden structural damage using blind source separation and time-frequency approaches

Morovati, V ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1088/0964-1726/25/5/055008
  3. Publisher: Institute of Physics Publishing , 2016
  4. Abstract:
  5. Seismic signal processing is one of the most reliable methods of detecting the structural damage during earthquakes. In this paper, the use of the hybrid method of blind source separation (BSS) and time-frequency analysis (TFA) is explored to detect the changes in the structural response data. The combination of the BSS and TFA is applied to the seismic signals due to the non-stationary nature of them. Firstly, the second-order blind identification technique is used to decompose the response signal of structural vibration into modal coordinate signals which will be mono-components for TFA. Then each mono-component signal is analyzed to extract instantaneous frequency of structure. Numerical simulations and a real-world seismic-excited structure with time-varying frequencies show the accuracy and robustness of the developed algorithm. TFA of extracted sources shows that used method can be successfully applied to structural damage detection. The results also demonstrate that the combined method can be used to identify the time instant of structural damage occurrence more sharply and effectively than by the use of TFA alone. © 2016 IOP Publishing Ltd
  6. Keywords:
  7. Time-frequency analysis ; Time-varying system ; Damage detection ; Earthquakes ; Seismic waves ; Seismology ; Signal detection ; Signal processing ; Structural analysis ; Structural dynamics ; Structural health monitoring ; Time varying systems ; Instantaneous frequency ; Mono-component signal ; Second order blind identifications ; Seismic signal processing ; Structural damage detection ; Time frequency analysis ; Time-frequency approach ; Time-varying frequency ; Blind source separation
  8. Source: Smart Materials and Structures ; Volume 25, Issue 5 , 2016 ; 09641726 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0964-1726/25/5/055008/meta;jsessionid=3A5E86B4E1208DF28AE15A08A02A2966.c1.iopscience.cld.iop.org