In recent years, a new research direction in structural condition assessment has been focusing on developing automated or semi-automated procedures to identify a structure’s modal parameters from its response measurements. This is because long-term structural monitoring systems rely on the implementation of system identification methodologies that often involve the intervention of an expert user with an acquired experience in the field. This paper aims to offer a semi-automated methodology for extracting the modal parameters independently of the chosen parametric system identification technique with minimum user involvement in the parameter selection process. Here, the framework is applied to two different parametric system identification algorithms: Data-Driven Stochastic Subspace Identification (DD-SSI) and Output Only Observer Kalman Filter (O/O OKID). The procedure can be represented as a multi-stage strategy where unsupervised tools and three clustering options are offered to the user to reach a reliable estimate of the modal parameters. The proposed procedure is validated with an application in the operational modal analysis of an existing hospital structure located in Italy. The results demonstrated excellent accuracy and robust performance of the methodology, even in the presence of closely spaced modes. The proposed procedure helps to improve the data analysis process in continuous monitoring, where usually, the algorithm’s parameters need to be constantly updated by the user.

Multi-stage semi-automated methodology for modal parameters estimation adopting parametric system identification algorithms / Tronci, ELEONORA MARIA; DE ANGELIS, Maurizio; Betti, Raimondo; Altomare, Vittorio. - In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING. - ISSN 0888-3270. - (2021). [10.1016/j.ymssp.2021.108317]

Multi-stage semi-automated methodology for modal parameters estimation adopting parametric system identification algorithms

Tronci Eleonora Maria
Primo
;
De Angelis Maurizio
Secondo
;
2021

Abstract

In recent years, a new research direction in structural condition assessment has been focusing on developing automated or semi-automated procedures to identify a structure’s modal parameters from its response measurements. This is because long-term structural monitoring systems rely on the implementation of system identification methodologies that often involve the intervention of an expert user with an acquired experience in the field. This paper aims to offer a semi-automated methodology for extracting the modal parameters independently of the chosen parametric system identification technique with minimum user involvement in the parameter selection process. Here, the framework is applied to two different parametric system identification algorithms: Data-Driven Stochastic Subspace Identification (DD-SSI) and Output Only Observer Kalman Filter (O/O OKID). The procedure can be represented as a multi-stage strategy where unsupervised tools and three clustering options are offered to the user to reach a reliable estimate of the modal parameters. The proposed procedure is validated with an application in the operational modal analysis of an existing hospital structure located in Italy. The results demonstrated excellent accuracy and robust performance of the methodology, even in the presence of closely spaced modes. The proposed procedure helps to improve the data analysis process in continuous monitoring, where usually, the algorithm’s parameters need to be constantly updated by the user.
2021
Structural health monitoring Semi-automated operational modal analysis Parametric system identification Clustering Outlier analysis
01 Pubblicazione su rivista::01a Articolo in rivista
Multi-stage semi-automated methodology for modal parameters estimation adopting parametric system identification algorithms / Tronci, ELEONORA MARIA; DE ANGELIS, Maurizio; Betti, Raimondo; Altomare, Vittorio. - In: MECHANICAL SYSTEMS AND SIGNAL PROCESSING. - ISSN 0888-3270. - (2021). [10.1016/j.ymssp.2021.108317]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1567586
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