A method for the frequency domain seakeeping analysis of offshore structures in the early design stage
The motion analysis of floating offshore structures is a major design aspect which has to be considered in the early design stage. The existing design environment E4 is an open software framework, which is being developed by the Institute of Ship Design and Ship Safety, comprising various methods fo...
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Online Access: | http://hdl.handle.net/11420/8712 |
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fttuhamburg:oai:tore.tuhh.de:11420/8712 2023-08-20T04:02:43+02:00 A method for the frequency domain seakeeping analysis of offshore structures in the early design stage Liebert, Maximilian 2020-08 http://hdl.handle.net/11420/8712 en eng ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2020 978-079188431-7 International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2020) http://hdl.handle.net/11420/8712 2-s2.0-85100007518 Design Frequency domain Seakeeping Semi-submersible Conference Paper Other 2020 fttuhamburg 2023-07-28T09:23:16Z The motion analysis of floating offshore structures is a major design aspect which has to be considered in the early design stage. The existing design environment E4 is an open software framework, which is being developed by the Institute of Ship Design and Ship Safety, comprising various methods for design and analysis of mainly ship-type structures. In context of the development to enhance the design environment E4 for offshore applications this paper presents a method to calculate the response motions of semi-submersibles in regular waves. The linearised equations of motion are set up in frequency domain in six degrees of freedom and the seakeeping behaviour is calculated in terms of the amplitudes of the harmonic responses. The hydrodynamic forces onto the slender elements of the semi-submersible are accounted for by a Morison approach. As the drag and damping forces depend quadratically on the amplitudes, these forces are linearised by an energy-equivalence principle. The resulting response amplitude operators of the semi-submersible are validated by comparison with model tests. The method represents a fast computational tool for the analysis of the seakeeping behaviour of floating offshore structures consisting of slender elements with circular cross sections in the early design stage. Conference Object Arctic TUHH Open Research (TORE - Technische Universität Hamburg) Volume 1: Offshore Technology |
institution |
Open Polar |
collection |
TUHH Open Research (TORE - Technische Universität Hamburg) |
op_collection_id |
fttuhamburg |
language |
English |
topic |
Design Frequency domain Seakeeping Semi-submersible |
spellingShingle |
Design Frequency domain Seakeeping Semi-submersible Liebert, Maximilian A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
topic_facet |
Design Frequency domain Seakeeping Semi-submersible |
description |
The motion analysis of floating offshore structures is a major design aspect which has to be considered in the early design stage. The existing design environment E4 is an open software framework, which is being developed by the Institute of Ship Design and Ship Safety, comprising various methods for design and analysis of mainly ship-type structures. In context of the development to enhance the design environment E4 for offshore applications this paper presents a method to calculate the response motions of semi-submersibles in regular waves. The linearised equations of motion are set up in frequency domain in six degrees of freedom and the seakeeping behaviour is calculated in terms of the amplitudes of the harmonic responses. The hydrodynamic forces onto the slender elements of the semi-submersible are accounted for by a Morison approach. As the drag and damping forces depend quadratically on the amplitudes, these forces are linearised by an energy-equivalence principle. The resulting response amplitude operators of the semi-submersible are validated by comparison with model tests. The method represents a fast computational tool for the analysis of the seakeeping behaviour of floating offshore structures consisting of slender elements with circular cross sections in the early design stage. |
format |
Conference Object |
author |
Liebert, Maximilian |
author_facet |
Liebert, Maximilian |
author_sort |
Liebert, Maximilian |
title |
A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
title_short |
A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
title_full |
A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
title_fullStr |
A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
title_full_unstemmed |
A method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
title_sort |
method for the frequency domain seakeeping analysis of offshore structures in the early design stage |
publishDate |
2020 |
url |
http://hdl.handle.net/11420/8712 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2020 978-079188431-7 International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2020) http://hdl.handle.net/11420/8712 2-s2.0-85100007518 |
container_title |
Volume 1: Offshore Technology |
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1774713318038044672 |