Force Identification and Response Prediction of an Offshore Platform Using Admittance Function and Incomplete Response Measurements

Amirali Sadeqi*, Luigi Caglio, Henrik Stang, Jørgen S. Nielsen, Ulf T. Tygesen, Evangelos Katsanos

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

In several existing structures and infrastructure systems, the loads and responses are hard to be accurately measured especially when the structural systems are partly or wholly inaccessible or located in harsh conditions (e.g., offshore structures). The chapter proposes a frequency-domain technique to estimate the force and response of vibrating structures using limited response signals. The frequency response function of a structure can be reconstructed either based on an updated finite element model’s properties or identified modal parameters by a data-driven approach. Next, the components of the frequency response function corresponding to a few degrees of freedom, whose response measurements are available, can be selected to create the admittance function and, consequently, to estimate the applied loads and predict the response of any degree of freedom. The technique is implemented on the finite element model of an offshore platform exposed to wave loads. The estimated wave loads and response of the submerged elements indicate the proposed technique’s competence in simplicity and efficiency compared with other methods.
Original languageEnglish
Title of host publicationDynamics of Civil Structures : Volume 2. Proceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics 2023
EditorsH.Y. Noh, M. Whelan, P.S. Harvey
Volume2
PublisherSpringer
Publication date2023
Pages139–150
Chapter18
ISBN (Print)978-3-031-36662-8
ISBN (Electronic)978-3-031-36663-5
DOIs
Publication statusPublished - 2023
EventSociety for Experimental Mechanics Annual Conference and Exposition - Orlando, United States
Duration: 5 Jun 20238 Jun 2023

Conference

ConferenceSociety for Experimental Mechanics Annual Conference and Exposition
Country/TerritoryUnited States
CityOrlando
Period05/06/202308/06/2023
SeriesConference Proceedings of the Society for Experimental Mechanics Series
Volume2
ISSN2191-5644

Keywords

  • Force Identification
  • Response Estimation
  • Offshore Jacket
  • Output-only Data
  • Sparse Data
  • Frequency Response Function
  • Admittance Function

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