Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae
Vibrissae of Phoca Vitulina (harbor seal) and Mirounga Angustirostris (elephant seal) possess undulations along their length. Harbor seal vibrissae have shown potential to reduce vortex induced vibrations and reduce drag compared to cylinders and ellipses. The exact geometry of the whiskers has not...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20180005317 2023-05-15T16:05:12+02:00 Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae Poinsatte, Philip Stone, Mark Rogenski, Elizabeth Thurman, Douglas DeArmon, Emily Shyam, Vikram Unclassified, Unlimited, Publicly available July 2018 application/pdf http://hdl.handle.net/2060/20180005317 unknown Document ID: 20180005317 http://hdl.handle.net/2060/20180005317 Copyright, Public use permitted CASI Life Sciences (General) NASA/TM-2018-219919 E-19537 GRC-E-DAA-TN56453 2018 ftnasantrs 2019-07-21T06:03:33Z Vibrissae of Phoca Vitulina (harbor seal) and Mirounga Angustirostris (elephant seal) possess undulations along their length. Harbor seal vibrissae have shown potential to reduce vortex induced vibrations and reduce drag compared to cylinders and ellipses. The exact geometry of the whiskers has not been well documented and the parameters that are responsible for the reduction in drag and vortex induced vibrations have not been characterized. Samples of six harbor seal vibrissae, six elephant seal vibrissae and six California sea lion (Zalophus californianus) vibrissae were collected from the Marine Mammal Center in California. The objectives of this study were to (1) Compare measurement techniques for digitizing and extracting parameters of the seal whiskers for the PeTaL (Periodic Table of Life) database. CT scanning, microscopy and 3D scanning techniques were compared. (2) Compare aerodynamic characteristics of a representative harbor seal whisker, elephant seal whisker, California sea lion whisker and ellipse at Re = 12000 and Re = 23000 based on major axis and free stream velocity. The data (in appendices) is available to compare CFD models or for further experimental validation, (3) Show close up images of whiskers and look for surface roughness effects. Variations in the seven parameters of the seal whisker were observed that may either be a feature of the vibration reduction mechanism or a result of natural variation. It is hypothesized that six parameters are sufficient to characterize seal whiskers based on analytic fitting. The drag coefficient of harbor seal whiskers examined in this study were found to be 25 percent lower than that of an ellipse with comparable major and minor axis lengths at Reynolds number of 12000. The dissipation length scale was found to be larger for seal whiskers. Potential applications of seal whisker morphology for aerospace are discussed. Roughness is not thought to play a factor in seal hydrodynamics. Other/Unknown Material Elephant Seal harbor seal Phoca vitulina NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
topic |
Life Sciences (General) |
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Life Sciences (General) Poinsatte, Philip Stone, Mark Rogenski, Elizabeth Thurman, Douglas DeArmon, Emily Shyam, Vikram Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
topic_facet |
Life Sciences (General) |
description |
Vibrissae of Phoca Vitulina (harbor seal) and Mirounga Angustirostris (elephant seal) possess undulations along their length. Harbor seal vibrissae have shown potential to reduce vortex induced vibrations and reduce drag compared to cylinders and ellipses. The exact geometry of the whiskers has not been well documented and the parameters that are responsible for the reduction in drag and vortex induced vibrations have not been characterized. Samples of six harbor seal vibrissae, six elephant seal vibrissae and six California sea lion (Zalophus californianus) vibrissae were collected from the Marine Mammal Center in California. The objectives of this study were to (1) Compare measurement techniques for digitizing and extracting parameters of the seal whiskers for the PeTaL (Periodic Table of Life) database. CT scanning, microscopy and 3D scanning techniques were compared. (2) Compare aerodynamic characteristics of a representative harbor seal whisker, elephant seal whisker, California sea lion whisker and ellipse at Re = 12000 and Re = 23000 based on major axis and free stream velocity. The data (in appendices) is available to compare CFD models or for further experimental validation, (3) Show close up images of whiskers and look for surface roughness effects. Variations in the seven parameters of the seal whisker were observed that may either be a feature of the vibration reduction mechanism or a result of natural variation. It is hypothesized that six parameters are sufficient to characterize seal whiskers based on analytic fitting. The drag coefficient of harbor seal whiskers examined in this study were found to be 25 percent lower than that of an ellipse with comparable major and minor axis lengths at Reynolds number of 12000. The dissipation length scale was found to be larger for seal whiskers. Potential applications of seal whisker morphology for aerospace are discussed. Roughness is not thought to play a factor in seal hydrodynamics. |
format |
Other/Unknown Material |
author |
Poinsatte, Philip Stone, Mark Rogenski, Elizabeth Thurman, Douglas DeArmon, Emily Shyam, Vikram |
author_facet |
Poinsatte, Philip Stone, Mark Rogenski, Elizabeth Thurman, Douglas DeArmon, Emily Shyam, Vikram |
author_sort |
Poinsatte, Philip |
title |
Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
title_short |
Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
title_full |
Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
title_fullStr |
Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
title_full_unstemmed |
Characterization and Analysis of Phoca Vitulina, Zalophus Californianus and Mirounga Angustirostris Vibrissae |
title_sort |
characterization and analysis of phoca vitulina, zalophus californianus and mirounga angustirostris vibrissae |
publishDate |
2018 |
url |
http://hdl.handle.net/2060/20180005317 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Elephant Seal harbor seal Phoca vitulina |
genre_facet |
Elephant Seal harbor seal Phoca vitulina |
op_source |
CASI |
op_relation |
Document ID: 20180005317 http://hdl.handle.net/2060/20180005317 |
op_rights |
Copyright, Public use permitted |
_version_ |
1766401040371941376 |