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Memorias de investigación
Communications at congresses:
Joint statistical analysis of multiple measurement setups for the estimation of vibrational modes
Year:2013
Research Areas
  • Engineering
Information
Abstract
Computing the modal parameters of large structures in Operational Modal Analysis often requires to process data from multiple non-simultaneously recorded setups of sensors. These setups share some sensors in common, the so-called reference sensors that are fixed for all the measurements, while the other sensors are moved from one setup to the next. One possibility is to process the setups separately what result in different modal parameter estimates for each setup. Then the reference sensors are used to merge or glue the different parts of the mode shapes to obtain global modes, while the natural frequencies and damping ratios are usually averaged. In this paper we present a state space model that can be used to process all setups at once so the global mode shapes are obtained automatically and subsequently only a value for the natural frequency and damping ratio of each mode is computed. We also present how this model can be estimated using maximum likelihood and the Expectation Maximization algorithm. We apply this technique to real data measured at a footbridge.
International
Si
Congress
5th International Modal Analysis Conference
960
Place
Oporto, Portugal
Reviewers
Si
ISBN/ISSN
978-972-8692-83-4
Start Date
13/05/2013
End Date
15/05/2013
From page
159
To page
160
5th International Modal Analysis Conference- Extended Abstracts
Participants
  • Autor: Francisco Javier Cara Cañas (UPM)
  • Autor: Jesus Juan Ruiz (UPM)
  • Autor: Enrique Alarcon Alvarez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Sísmica: Dinámica de Suelos y Estructuras
  • Grupo de Investigación: Estadística computacional y Modelado estocástico
  • Departamento: Ingeniería de Organización, Administración de Empresas y Estadística
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