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The use of operational modal analysis and mode tracking for insight into polar vessel operations

van Zijl, Christof and Soal, Keith Ian and Volkmar, Robin and Govers, Yves and Böswald, Marc and Bekker, Annie (2021) The use of operational modal analysis and mode tracking for insight into polar vessel operations. Marine Structures, 79 (103043). Elsevier. doi: 10.1016/j.marstruc.2021.103043. ISSN 0951-8339.

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Accurate dynamic models of flexible ship structures are required to predict structural vibration caused by environmental loads. Knowledge of dynamic or modal properties are important, for example, to study fatigue damage. In this paper, operational modal analysis (OMA) is used to identify the vibration characteristics of a polar vessel from full-scale acceleration measurements. Five modes are tracked over a range of different operating and environmental conditions, including calm, open water, two ice cases and an open water storm. Compared to the calm, open water conditions, vertical bending modes were generally affected the most by the operating environment, with natural frequency and damping increasing up to 3.7 and 349 %, respectively, in ice. Severity of two-node and three-node vertical bending responses, quantified using a root-mean-square value, were found to be especially large during the open water storm case. Temporal behaviour of two-node and three-node vertical bending due to wave-slamming further contained multiple whipping responses, pointing towards possible cumulative damage over a large number of stress cycles occurring at the midship. Higher damping in ice resulted in responses with lower magnitudes and shorter durations.

Item URL in elib:https://elib.dlr.de/143422/
Document Type:Article
Title:The use of operational modal analysis and mode tracking for insight into polar vessel operations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Soal, Keith IanKeith.Soal (at) dlr.dehttps://orcid.org/0000-0002-5132-6823
Volkmar, RobinRobin.Volkmar (at) dlr.deUNSPECIFIED
Govers, YvesYves.Govers (at) dlr.dehttps://orcid.org/0000-0003-2236-596X
Böswald, MarcMarc.Boeswald (at) dlr.deUNSPECIFIED
Bekker, Annieannieb (at) sun.ac.zaUNSPECIFIED
Date:9 June 2021
Journal or Publication Title:Marine Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.marstruc.2021.103043
Keywords:Operational modal analysis, mode tracking, full-scale measurements, polar vessels, whipping, fatigue
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Soal, Dr Keith Ian
Deposited On:02 Sep 2021 11:48
Last Modified:28 Jan 2022 11:12

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