Structure and Bending Properties of Central Part of Tail Fin of Dolphin
Dolphins swim by vertical oscillation of their tail fins which have been considered to play an important role for generating thrust. The propulsive performance of the tail fin relates with the structure and the mechanical properties of the tail fin. Our objectives are to investigate the structure an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2010-08-01
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| Series: | Journal of Biomechanical Science and Engineering |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jbse/5/4/5_4_388/_pdf/-char/en |
| _version_ | 1811224813003341824 |
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| author | Qilong SUN Hirohisa MORIKAWA Shunichi KOBAYASHI Keiichi UEDA Hirokazu MIYAHARA Motomu NAKASHIMA |
| author_facet | Qilong SUN Hirohisa MORIKAWA Shunichi KOBAYASHI Keiichi UEDA Hirokazu MIYAHARA Motomu NAKASHIMA |
| author_sort | Qilong SUN |
| collection | DOAJ |
| description | Dolphins swim by vertical oscillation of their tail fins which have been considered to play an important role for generating thrust. The propulsive performance of the tail fin relates with the structure and the mechanical properties of the tail fin. Our objectives are to investigate the structure and the bending properties of the central part of the tail fin of a dolphin. A sample of the tail fin was anatomized to investigate the vertebrae structure and tendons insertions, and the bending tests were carried out on the central part of the tail fin at the state with tensions on the tendons. Our results demonstrated that there were three kinds of tendons in the tail fin, that is, the epaxial tendon I, the epaxial tendon II and the hypaxial tendon. The epaxial tendons Is inserted into each tail vertebra, the epaxial tendon IIs inserted into five tip tail vertebrae, and the hypaxial tendons inserted on the chevron bones and tail vertebrae. In the bending test, it was found the tension which was acted on the epaxial tendon IIs produced larger bending deformation and made the central part of the tail fin stiffer than the same tension which was acted on the epaxial tendon Is or hypaxial tendons. |
| first_indexed | 2024-04-12T08:55:24Z |
| format | Article |
| id | doaj.art-d18515efc34b47819dc95805e4c92c29 |
| institution | Directory Open Access Journal |
| issn | 1880-9863 |
| language | English |
| last_indexed | 2024-04-12T08:55:24Z |
| publishDate | 2010-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Biomechanical Science and Engineering |
| spelling | doaj.art-d18515efc34b47819dc95805e4c92c292022-12-22T03:39:25ZengThe Japan Society of Mechanical EngineersJournal of Biomechanical Science and Engineering1880-98632010-08-015438839810.1299/jbse.5.388jbseStructure and Bending Properties of Central Part of Tail Fin of DolphinQilong SUN0Hirohisa MORIKAWA1Shunichi KOBAYASHI2Keiichi UEDA3Hirokazu MIYAHARA4Motomu NAKASHIMA5Faculty of Textile Science and Technology, Shinshu UniversityFaculty of Textile Science and Technology, Shinshu UniversityFaculty of Textile Science and Technology, Shinshu UniversityOkinawa Churaumi AquariumOkinawa Churaumi AquariumDepartment of Mechanical and Environmental Informatics, Tokyo Institute of TechnologyDolphins swim by vertical oscillation of their tail fins which have been considered to play an important role for generating thrust. The propulsive performance of the tail fin relates with the structure and the mechanical properties of the tail fin. Our objectives are to investigate the structure and the bending properties of the central part of the tail fin of a dolphin. A sample of the tail fin was anatomized to investigate the vertebrae structure and tendons insertions, and the bending tests were carried out on the central part of the tail fin at the state with tensions on the tendons. Our results demonstrated that there were three kinds of tendons in the tail fin, that is, the epaxial tendon I, the epaxial tendon II and the hypaxial tendon. The epaxial tendons Is inserted into each tail vertebra, the epaxial tendon IIs inserted into five tip tail vertebrae, and the hypaxial tendons inserted on the chevron bones and tail vertebrae. In the bending test, it was found the tension which was acted on the epaxial tendon IIs produced larger bending deformation and made the central part of the tail fin stiffer than the same tension which was acted on the epaxial tendon Is or hypaxial tendons.https://www.jstage.jst.go.jp/article/jbse/5/4/5_4_388/_pdf/-char/endolphinepaxial tendon iepaxial tendon iihypaxial tendonbending test |
| spellingShingle | Qilong SUN Hirohisa MORIKAWA Shunichi KOBAYASHI Keiichi UEDA Hirokazu MIYAHARA Motomu NAKASHIMA Structure and Bending Properties of Central Part of Tail Fin of Dolphin Journal of Biomechanical Science and Engineering dolphin epaxial tendon i epaxial tendon ii hypaxial tendon bending test |
| title | Structure and Bending Properties of Central Part of Tail Fin of Dolphin |
| title_full | Structure and Bending Properties of Central Part of Tail Fin of Dolphin |
| title_fullStr | Structure and Bending Properties of Central Part of Tail Fin of Dolphin |
| title_full_unstemmed | Structure and Bending Properties of Central Part of Tail Fin of Dolphin |
| title_short | Structure and Bending Properties of Central Part of Tail Fin of Dolphin |
| title_sort | structure and bending properties of central part of tail fin of dolphin |
| topic | dolphin epaxial tendon i epaxial tendon ii hypaxial tendon bending test |
| url | https://www.jstage.jst.go.jp/article/jbse/5/4/5_4_388/_pdf/-char/en |
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