Operational modal analisys using joint statistical analysis of multiple records

Cara Cañas, Francisco Javier and Alarcón Álvarez, Enrique and Juan Ruiz, Jesús (2013). Operational modal analisys using joint statistical analysis of multiple records. In: "11th International Conference on Recent Advances in Structural Dynamics, RASD 2012", 01/07/2013-03/07/2013, Pisa. ISBN 978-0854329649.

Description

Title: Operational modal analisys using joint statistical analysis of multiple records
Author/s:
  • Cara Cañas, Francisco Javier
  • Alarcón Álvarez, Enrique
  • Juan Ruiz, Jesús
Item Type: Presentation at Congress or Conference (Article)
Event Title: 11th International Conference on Recent Advances in Structural Dynamics, RASD 2012
Event Dates: 01/07/2013-03/07/2013
Event Location: Pisa
Title of Book: Proceedings of the 11th International Conference on Recent Advances in Structural Dynamics
Date: 2013
ISBN: 978-0854329649
Subjects:
Freetext Keywords: Operational modal analysis; Expectation-maximization algorithm; Multiple record; Analysis; State space model
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería de Organización, Administración de Empresas y Estadística
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In Operational Modal Analysis (OMA) of a structure, the data acquisition process may be repeated many times. In these cases, the analyst has several similar records for the modal analysis of the structure that have been obtained at di�erent time instants (multiple records). The solution obtained varies from one record to another, sometimes considerably. The differences are due to several reasons: statistical errors of estimation, changes in the external forces (unmeasured forces) that modify the output spectra, appearance of spurious modes, etc. Combining the results of the di�erent individual analysis is not straightforward. To solve the problem, we propose to make the joint estimation of the parameters using all the records. This can be done in a very simple way using state space models and computing the estimates by maximum-likelihood. The method provides a single result for the modal parameters that combines optimally all the records.

More information

Item ID: 26403
DC Identifier: http://oa.upm.es/26403/
OAI Identifier: oai:oa.upm.es:26403
Official URL: https://www.ocs.soton.ac.uk/index.php/rasdconference/RASD2013
Deposited by: Biblioteca ETSI Industriales
Deposited on: 22 May 2014 11:14
Last Modified: 11 Nov 2014 15:43
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