Modeling of ship resistance in compressive ice
Dynamic ice fields are one of the greatest hazards for maritime traffic in winter conditions. Converging ice cover, driven by the wind and current stresses, is able to trap even the most powerful vessels, yet little is known about the effects and forces involved. This thesis seeks to derive a simpli...
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ftaaltouniv:oai:aaltodoc.aalto.fi:123456789/99703 2023-05-15T18:18:00+02:00 Modeling of ship resistance in compressive ice Kaups, Kristjan Insinööritieteiden korkeakoulu School of Engineering Sovelletun mekaniikan laitos Kujala, Pentti Aalto-yliopisto Aalto University 2011 https://aaltodoc.aalto.fi/handle/123456789/99703 en eng https://aaltodoc.aalto.fi/handle/123456789/99703 URN:NBN:fi:aalto-2020122358530 closedAccess compressive ice ice resistance ice breaking pattern ice dynamics ship-ice interaction Master's thesis Pro gradu -tutkielma masterThesis G2 Pro gradu, diplomityö 2011 ftaaltouniv 2022-12-15T19:31:32Z Dynamic ice fields are one of the greatest hazards for maritime traffic in winter conditions. Converging ice cover, driven by the wind and current stresses, is able to trap even the most powerful vessels, yet little is known about the effects and forces involved. This thesis seeks to derive a simplified method evaluating the added resistance due to compression in the level ice field. In order to model the additional resistance, different topics such as ice conditions and speeds in the Baltic Sea, ice breaking pattern around the vessel and pressures generated in ship-ice interaction, are studied in depth. Natural sea ice is highly heterogeneous and causes high scatter in any measurement values. This study seeks to find the average added resistance in the compressive ice field by defining the average values for ice properties. Method presented is limited to vessels with long, vertical parallel mid ship section such as tankers and bulkers. Results of the calculation model are compared with two different datasets. First consisting of AIS (Automatic Identification System) data analysis of reported compressive situations from winters 2009/2010 and 2010/2011. Second data set is obtained from model ice tests. Correlation with both data sets is visible. Results demonstrate that additional resistance tends to decrease at higher vessel speeds, while level ice resistance increases. In moderate ice going speeds, converging ice field can more than double the total resistance of the vessel. Master Thesis Sea ice Aalto University Publication Archive (Aaltodoc) |
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Open Polar |
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Aalto University Publication Archive (Aaltodoc) |
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ftaaltouniv |
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English |
topic |
compressive ice ice resistance ice breaking pattern ice dynamics ship-ice interaction |
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compressive ice ice resistance ice breaking pattern ice dynamics ship-ice interaction Kaups, Kristjan Modeling of ship resistance in compressive ice |
topic_facet |
compressive ice ice resistance ice breaking pattern ice dynamics ship-ice interaction |
description |
Dynamic ice fields are one of the greatest hazards for maritime traffic in winter conditions. Converging ice cover, driven by the wind and current stresses, is able to trap even the most powerful vessels, yet little is known about the effects and forces involved. This thesis seeks to derive a simplified method evaluating the added resistance due to compression in the level ice field. In order to model the additional resistance, different topics such as ice conditions and speeds in the Baltic Sea, ice breaking pattern around the vessel and pressures generated in ship-ice interaction, are studied in depth. Natural sea ice is highly heterogeneous and causes high scatter in any measurement values. This study seeks to find the average added resistance in the compressive ice field by defining the average values for ice properties. Method presented is limited to vessels with long, vertical parallel mid ship section such as tankers and bulkers. Results of the calculation model are compared with two different datasets. First consisting of AIS (Automatic Identification System) data analysis of reported compressive situations from winters 2009/2010 and 2010/2011. Second data set is obtained from model ice tests. Correlation with both data sets is visible. Results demonstrate that additional resistance tends to decrease at higher vessel speeds, while level ice resistance increases. In moderate ice going speeds, converging ice field can more than double the total resistance of the vessel. |
author2 |
Insinööritieteiden korkeakoulu School of Engineering Sovelletun mekaniikan laitos Kujala, Pentti Aalto-yliopisto Aalto University |
format |
Master Thesis |
author |
Kaups, Kristjan |
author_facet |
Kaups, Kristjan |
author_sort |
Kaups, Kristjan |
title |
Modeling of ship resistance in compressive ice |
title_short |
Modeling of ship resistance in compressive ice |
title_full |
Modeling of ship resistance in compressive ice |
title_fullStr |
Modeling of ship resistance in compressive ice |
title_full_unstemmed |
Modeling of ship resistance in compressive ice |
title_sort |
modeling of ship resistance in compressive ice |
publishDate |
2011 |
url |
https://aaltodoc.aalto.fi/handle/123456789/99703 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://aaltodoc.aalto.fi/handle/123456789/99703 URN:NBN:fi:aalto-2020122358530 |
op_rights |
closedAccess |
_version_ |
1766193855159336960 |