Vibration Damping of Large Containership in Operation

Saeed Shakibfar, Ingrid M. V. Andersen, Anders Brandt*

*Corresponding author for this work

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

Abstract

Vibration damping is a paramount factor in understanding vibrations in structures because the response of a structure under stationary dynamic loads, at resonance, is directly (inversely) proportional to the damping. Also, transient response of a structure decays exponentially at a rate determined by the damping factor and eigenfrequency of each mode. Thus, to compute forced responses, the damping must be known. Despite damping thus being of large importance, there is limited knowledge of the damping of ships in general and of large container ships in particular. Some studies have suggested the damping is speed dependent, whereas others have not. In the last ISSC 2018 report, it was concluded that more data are needed from full-scale measurements. In the present paper the dynamics of a large container ship in operation is investigated, from full scale measurements in different operation conditions. State-of-the art, so-called operational modal analysis (OMA) is used for computing the eigenfrequencies, damping factors, and mode shapes of the ship. It is discussed how particularly the vibration damping varies with different operating parameters such as cargo, speed, and sea state.
Original languageEnglish
Title of host publicationPractical Design of Ships and Other Floating Structures : Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume II
EditorsTetsuo Okada, Katsuyuki Suzuki, Yasumi Kawamura
PublisherSpringer
Publication date2021
Pages321-329
ISBN (Print)9789811546716
ISBN (Electronic)978-981-15-4672-3
DOIs
Publication statusPublished - 2021
EventInternational Symposium, PRADS 2019 - Yokohama, Japan
Duration: 22. Sep 201926. Sep 2019
Conference number: 14

Conference

ConferenceInternational Symposium, PRADS 2019
Number14
CountryJapan
CityYokohama
Period22/09/201926/09/2019
SeriesLecture Notes in Civil Engineering
Volume64

Keywords

  • Large container ship
  • Operational modal analysis
  • Vibration damping

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