Acceleration signals are recorded on different points of the structure, allowing for the estimation of the building’s parameters (i.e. frequency and instantaneous damping). The method uses auto- and cross-time-frequency transforms of the recorded signals to identify the vibration modes as a function of time and of the amplitude of the vibrations. The distributions considered have a quadratic structure, with convenient properties in the analysis of mechanical signals. In addition, quadratic distributions can use kernels in the ambiguity function domain that improve the reliability of the identification, reducing the cross terms of the distribution. The obtained results are compared with those afforded by Stochastic Subspace techniques. A model updating of the structure is also performed, starting from an indirect procedure, to provide model-based verifications.

Time-frequency domain identification of modal parameters in complex masonry structures under ambient vibrations / Marmolejo, Mario Alberto; Marulanda, Johannio; Miraglia, Gaetano; Thomson, Peter; Ceravolo, Rosario. - In: PROCEDIA ENGINEERING. - ISSN 1877-7058. - ELETTRONICO. - 199:(2017), pp. 2184-2189. [10.1016/j.proeng.2017.09.178]

Time-frequency domain identification of modal parameters in complex masonry structures under ambient vibrations

MIRAGLIA, GAETANO;CERAVOLO, Rosario
2017

Abstract

Acceleration signals are recorded on different points of the structure, allowing for the estimation of the building’s parameters (i.e. frequency and instantaneous damping). The method uses auto- and cross-time-frequency transforms of the recorded signals to identify the vibration modes as a function of time and of the amplitude of the vibrations. The distributions considered have a quadratic structure, with convenient properties in the analysis of mechanical signals. In addition, quadratic distributions can use kernels in the ambiguity function domain that improve the reliability of the identification, reducing the cross terms of the distribution. The obtained results are compared with those afforded by Stochastic Subspace techniques. A model updating of the structure is also performed, starting from an indirect procedure, to provide model-based verifications.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2680473
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