Time-frequency analysis in structures monitoring subject to extreme dynamic loads

Authors:
Theodor D. Popescu
Affiliations:
National Institute for Research and Development in Informatics, Research Department, Bucharest, Romania
Venue:
MMACTEE'07 Proceedings of the 9th WSEAS international conference on Mathematical methods and computational techniques in electrical engineering
Year:
2007

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Identifying mechanical characteristics of materials with non-linear behavior using statistical methods

CEA'10 Proceedings of the 4th WSEAS international conference on Computer engineering and applications

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Abstract

The structures monitoring subject to actions produced by extreme dynamic loads (earthquakes, strong wind, tornados, sea waves etc.) need to account for temporal evolution of their frequency content. Separate time analysis and frequency analysis by themselves do not fully describe the nature of these dynamic loads. As consequence, it is required to develop and use some non-stationary spectral analysis techniques. Significant efforts in order to permit the temporal evolution of non-stationary spectral characteristics representation have been done in the last years. The objective of this paper is to present some techniques currently available with possible application in earthquake engineering. Finally, some experimental results obtained in the analysis of the earthquake records during the Vrancea seism, August 1986, Romania, are presented.