The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer)
The relative role of the various structures in the head of the baiji (Lipotes vexillifer) is examined. A finite element approach was applied to numerically simulate the acoustic propagation through a dolphin's head to examine the relative role of the skull, air sacs, and melon in the formation...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
ACOUSTICAL SOC AMER AMER INST PHYSICS
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/76256 |
| _version_ | 1848763655541227520 |
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| author | Wei, Chong Au, Whitlow WL Song, Zhongchang Zhang, Yu |
| author_facet | Wei, Chong Au, Whitlow WL Song, Zhongchang Zhang, Yu |
| author_sort | Wei, Chong |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The relative role of the various structures in the head of the baiji (Lipotes vexillifer) is examined. A finite element approach was applied to numerically simulate the acoustic propagation through a dolphin's head to examine the relative role of the skull, air sacs, and melon in the formation of the biosonar beam in the vertical plane. The beam pattern obtained with the whole head in place is compared with the beam pattern when the air sac is removed and the other structures (skull and melon) are in place, with only the skull removed, and finally with only the melon removed. The beam pattern with the air sacs and skull intact and the melon removed closely resembled the beam pattern for the complete head, suggesting that the melon has a minor role in the formation of the beam. The beam pattern for the other two cases had very little resemblance to the beam pattern for the whole head. The air sacs seem to have a role of directing propagation of the signal toward the front and the skull prevents the sound propagating below the rostrum. The beam patterns along with a correlation analysis showed that the melon had only a slight influence on the shape and direction of the beam. The resultant beam exiting the head of the dolphin is the result of complex reflection processes within the head of the animal. |
| first_indexed | 2025-11-14T11:06:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-76256 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:06:55Z |
| publishDate | 2016 |
| publisher | ACOUSTICAL SOC AMER AMER INST PHYSICS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-762562019-09-12T06:50:58Z The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) Wei, Chong Au, Whitlow WL Song, Zhongchang Zhang, Yu Science & Technology Technology Life Sciences & Biomedicine Acoustics Audiology & Speech-Language Pathology FINITE-ELEMENT MODEL ECHOLOCATION SIGNALS TURSIOPS-TRUNCATUS DELPHINUS-DELPHIS PATTERN The relative role of the various structures in the head of the baiji (Lipotes vexillifer) is examined. A finite element approach was applied to numerically simulate the acoustic propagation through a dolphin's head to examine the relative role of the skull, air sacs, and melon in the formation of the biosonar beam in the vertical plane. The beam pattern obtained with the whole head in place is compared with the beam pattern when the air sac is removed and the other structures (skull and melon) are in place, with only the skull removed, and finally with only the melon removed. The beam pattern with the air sacs and skull intact and the melon removed closely resembled the beam pattern for the complete head, suggesting that the melon has a minor role in the formation of the beam. The beam pattern for the other two cases had very little resemblance to the beam pattern for the whole head. The air sacs seem to have a role of directing propagation of the signal toward the front and the skull prevents the sound propagating below the rostrum. The beam patterns along with a correlation analysis showed that the melon had only a slight influence on the shape and direction of the beam. The resultant beam exiting the head of the dolphin is the result of complex reflection processes within the head of the animal. 2016 Journal Article http://hdl.handle.net/20.500.11937/76256 10.1121/1.4941780 English ACOUSTICAL SOC AMER AMER INST PHYSICS restricted |
| spellingShingle | Science & Technology Technology Life Sciences & Biomedicine Acoustics Audiology & Speech-Language Pathology FINITE-ELEMENT MODEL ECHOLOCATION SIGNALS TURSIOPS-TRUNCATUS DELPHINUS-DELPHIS PATTERN Wei, Chong Au, Whitlow WL Song, Zhongchang Zhang, Yu The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title | The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title_full | The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title_fullStr | The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title_full_unstemmed | The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title_short | The role of various structures in the head on the formation of the biosonar beam of the baiji (Lipotes vexillifer) |
| title_sort | role of various structures in the head on the formation of the biosonar beam of the baiji (lipotes vexillifer) |
| topic | Science & Technology Technology Life Sciences & Biomedicine Acoustics Audiology & Speech-Language Pathology FINITE-ELEMENT MODEL ECHOLOCATION SIGNALS TURSIOPS-TRUNCATUS DELPHINUS-DELPHIS PATTERN |
| url | http://hdl.handle.net/20.500.11937/76256 |