State space models for multi-setup operational modal analysis

Cara Cañas, Francisco Javier; Juan Ruiz, Jesús y Alarcón Álvarez, Enrique (2014). State space models for multi-setup operational modal analysis. En: "IX International Conference on Structural Dynamics", 30/06/2014-02/07/2014, Porto (Portugal). ISBN 978-972-752-165-4. pp. 2471-2476.

Descripción

Título: State space models for multi-setup operational modal analysis
Autor/es:
  • Cara Cañas, Francisco Javier
  • Juan Ruiz, Jesús
  • Alarcón Álvarez, Enrique
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: IX International Conference on Structural Dynamics
Fechas del Evento: 30/06/2014-02/07/2014
Lugar del Evento: Porto (Portugal)
Título del Libro: EURODYN 2014 : IX International Conference on Structural Dynamics : Proceedings
Fecha: Julio 2014
ISBN: 978-972-752-165-4
Materias:
Palabras Clave Informales: Operational Modal Analysis, multiple setups of sensors, state space model, Expectation-Maximization algorithm
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería de Organización, Administración de Empresas y Estadística
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (2MB) | Vista Previa

Resumen

Operational Modal Analysis consists on estimate the modal parameters of a structure (natural frequencies, damping ratios and modal vectors) from output-only vibration measurements. The modal vectors can be only estimated where a sensor is placed, so when the number of available sensors is lower than the number of tested points, it is usual to perform several tests changing the position of the sensors from one test to the following (multiple setups of sensors): some sensors stay at the same position from setup to setup, and the other sensors change the position until all the tested points are covered. The permanent sensors are then used to merge the mode shape estimated at each setup (or partial modal vectors) into global modal vectors. Traditionally, the partial modal vectors are estimated independently setup by setup, and the global modal vectors are obtained in a postprocess phase. In this work we present two state space models that can be used to process all the recorded setups at the same time, and we also present how these models can be estimated using the maximum likelihood method. The result is that the global mode shape of each mode is obtained automatically, and subsequently, a single value for the natural frequency and damping ratio of the mode is computed. Finally, both models are compared using real measured data.

Más información

ID de Registro: 39157
Identificador DC: http://oa.upm.es/39157/
Identificador OAI: oai:oa.upm.es:39157
URL Oficial: http://paginas.fe.up.pt/~eurodyn2014/CD/program.html
Depositado por: Biblioteca ETSI Industriales
Depositado el: 01 Feb 2016 14:08
Ultima Modificación: 01 Feb 2016 14:08
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM