A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice
As the seasons change, sea ice in the polar regions undergoes a freeze-thaw cycle producing anisotropic sea ice in terms of physical properties and structures. Deformation of these variable structures from the freeze-thaw cycle and flux of energy within the polar regions causes the ice to fracture r...
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ftportlandstate:oai:pdxscholar.library.pdx.edu:honorstheses-1017 2023-05-15T15:08:51+02:00 A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice Gatimu, Muciri Nyamu 2013-06-14T07:00:00Z application/pdf https://pdxscholar.library.pdx.edu/honorstheses/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1017&context=honorstheses unknown PDXScholar https://pdxscholar.library.pdx.edu/honorstheses/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1017&context=honorstheses In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). University Honors Theses Acoustic emission -- Simulation methods Sea ice -- Polar regions Underwater acoustics text 2013 ftportlandstate 2022-01-09T19:27:59Z As the seasons change, sea ice in the polar regions undergoes a freeze-thaw cycle producing anisotropic sea ice in terms of physical properties and structures. Deformation of these variable structures from the freeze-thaw cycle and flux of energy within the polar regions causes the ice to fracture radiating noise into the water. Simulating the noise from sea ice is difficult due to the variability in the physical properties of sea ice, dynamic environment of the polar regions, complex physics governing sound propagation and numerous methods by which the emission of noise can be generated from sea ice. The radiated ambient noise generated from deforming sea ice can influence the habits of oceanic life, targeting abilities of vessels equipped with sonar, and add to the background acoustic noise in the polar regions. This work addresses the noise generated by opening (Mode I) fractures in sea ice. OASN was used to simulate acoustic waves propagating through the complex arctic environment. For this problem, a significant understanding of mathematics was required to overcome a mathematical aberration, within the computational tool, which was reduced and compared against simulations computed by an alternate propagation tool, RAM. Simulations of Model I fractures were compared against observed data. The methods developed for the simulation of Mode I fractures was proven successful. Text Arctic Sea ice Portland State University: PDXScholar Arctic |
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Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
Acoustic emission -- Simulation methods Sea ice -- Polar regions Underwater acoustics |
spellingShingle |
Acoustic emission -- Simulation methods Sea ice -- Polar regions Underwater acoustics Gatimu, Muciri Nyamu A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
topic_facet |
Acoustic emission -- Simulation methods Sea ice -- Polar regions Underwater acoustics |
description |
As the seasons change, sea ice in the polar regions undergoes a freeze-thaw cycle producing anisotropic sea ice in terms of physical properties and structures. Deformation of these variable structures from the freeze-thaw cycle and flux of energy within the polar regions causes the ice to fracture radiating noise into the water. Simulating the noise from sea ice is difficult due to the variability in the physical properties of sea ice, dynamic environment of the polar regions, complex physics governing sound propagation and numerous methods by which the emission of noise can be generated from sea ice. The radiated ambient noise generated from deforming sea ice can influence the habits of oceanic life, targeting abilities of vessels equipped with sonar, and add to the background acoustic noise in the polar regions. This work addresses the noise generated by opening (Mode I) fractures in sea ice. OASN was used to simulate acoustic waves propagating through the complex arctic environment. For this problem, a significant understanding of mathematics was required to overcome a mathematical aberration, within the computational tool, which was reduced and compared against simulations computed by an alternate propagation tool, RAM. Simulations of Model I fractures were compared against observed data. The methods developed for the simulation of Mode I fractures was proven successful. |
format |
Text |
author |
Gatimu, Muciri Nyamu |
author_facet |
Gatimu, Muciri Nyamu |
author_sort |
Gatimu, Muciri Nyamu |
title |
A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
title_short |
A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
title_full |
A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
title_fullStr |
A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
title_full_unstemmed |
A Method for Simulating Acoustic Emissions from Tensile Cracks in Sea Ice |
title_sort |
method for simulating acoustic emissions from tensile cracks in sea ice |
publisher |
PDXScholar |
publishDate |
2013 |
url |
https://pdxscholar.library.pdx.edu/honorstheses/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1017&context=honorstheses |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
University Honors Theses |
op_relation |
https://pdxscholar.library.pdx.edu/honorstheses/21 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1017&context=honorstheses |
op_rights |
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
_version_ |
1766340137922330624 |