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Tracking of inputs, states and parameters of linear structural dynamic systems
Katholieke Univ Leuven, Dept Civil Engn, Leuven, Belgium..
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. Katholieke Univ Leuven, Dept Civil Engn, Leuven, Belgium..ORCID iD: 0000-0002-4203-145X
Katholieke Univ Leuven, Dept Civil Engn, Leuven, Belgium..
2019 (English)In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 130, p. 755-775Article in journal (Refereed) Published
Abstract [en]

This paper presents a novel algorithm for joint input-state-parameter estimation in structural dynamics. The algorithm is derived from an existing smoothing algorithm. In each time step, the system model adopted in the joint input-state-parameter estimation is linearized around the current state, yielding an algorithm similar to the extended Kalman filter. It is shown that adopting a time delay in the estimation can significantly reduce the estimation error, especially in case data originates from sensors that are not collocated with the estimated inputs. Analytical expressions for the sensitivities of the system matrices with respect to unknown parameters are derived for the case of a linear underlying state-space model. These sensitivities are derived for models expressed in physical coordinates, models expressed in modal coordinates, and modally reduced-order models with a quasi-static correction to account for the contribution of the out-of-band modes. The proposed methodology is verified using numerical simulations and validated using data obtained from a laboratory experiment on a steel beam with I-shaped cross section.

Place, publisher, year, edition, pages
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD , 2019. Vol. 130, p. 755-775
Keywords [en]
Structural health monitoring, Joint input-state-parameter estimation, Modally reduced order model, Data fusion
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-261971DOI: 10.1016/j.ymssp.2019.04.048ISI: 000487006500042Scopus ID: 2-s2.0-85066262691OAI: oai:DiVA.org:kth-261971DiVA, id: diva2:1360629
Note

QC 20191014

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved

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Karlsson, Freddie

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