Study on the thrust generated by a thin plate imitating fish’s caudal fin
Purpose of this study is to investigate the relation between the shape of a thin plate and thrust force. The thin plate is what imitates the fish’s caudal fin. We adopt an equilateral triangular, square, regular pentagon and hexagon as the shape of the plate. There are two ways of yielding thrust...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2016-01-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/82/833/82_15-00407/_pdf/-char/en |
| _version_ | 1811221179844788224 |
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| author | Mitsuhiro NAKAJIMA Yoshihiro KUBOTA Osamu MOCHIZUKI |
| author_facet | Mitsuhiro NAKAJIMA Yoshihiro KUBOTA Osamu MOCHIZUKI |
| author_sort | Mitsuhiro NAKAJIMA |
| collection | DOAJ |
| description | Purpose of this study is to investigate the relation between the shape of a thin plate and thrust force. The thin plate is what imitates the fish’s caudal fin. We adopt an equilateral triangular, square, regular pentagon and hexagon as the shape of the plate. There are two ways of yielding thrust of fish; 1) drag-type as seen in flatfish and cod, and 2) lift-type as seen in tuna and shark. We focus on the drag-type fin, and consider reasons of different thrust with different shape of the fin. We simulate the reciprocal motion with some frequency of the plate as the fish tail at both situations in water being at rest and under a uniform flow. We measure the force acting on the plate directly, and consider the generating mechanism of the thrust due to the motion of the plate. To estimate force acting on the plate, we introduce the momentum consideration and the circulation of vortices due to the impulsive pressure of an edge of the plate starting suddenly. We discuss the relation between the shape of the plate and force due to the accelerating and decelerating motion of the plate in this paper. The most powerful shape of the fin is the triangular for an impulsive start. The spin parameter has to exceed 0.84 to produce the thrust force in the flow. |
| first_indexed | 2024-04-12T07:54:51Z |
| format | Article |
| id | doaj.art-cc61274d180c4162a9bc8cf3628359d0 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T07:54:51Z |
| publishDate | 2016-01-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-cc61274d180c4162a9bc8cf3628359d02022-12-22T03:41:30ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612016-01-018283315-0040715-0040710.1299/transjsme.15-00407transjsmeStudy on the thrust generated by a thin plate imitating fish’s caudal finMitsuhiro NAKAJIMA0Yoshihiro KUBOTA1Osamu MOCHIZUKI2Graduate school of Bio Medical Engineering, Toyo UniversityFaculty of Science and Engineering, Toyo UniversityDepartment of Bio Medical Engineering, Toyo UniversityPurpose of this study is to investigate the relation between the shape of a thin plate and thrust force. The thin plate is what imitates the fish’s caudal fin. We adopt an equilateral triangular, square, regular pentagon and hexagon as the shape of the plate. There are two ways of yielding thrust of fish; 1) drag-type as seen in flatfish and cod, and 2) lift-type as seen in tuna and shark. We focus on the drag-type fin, and consider reasons of different thrust with different shape of the fin. We simulate the reciprocal motion with some frequency of the plate as the fish tail at both situations in water being at rest and under a uniform flow. We measure the force acting on the plate directly, and consider the generating mechanism of the thrust due to the motion of the plate. To estimate force acting on the plate, we introduce the momentum consideration and the circulation of vortices due to the impulsive pressure of an edge of the plate starting suddenly. We discuss the relation between the shape of the plate and force due to the accelerating and decelerating motion of the plate in this paper. The most powerful shape of the fin is the triangular for an impulsive start. The spin parameter has to exceed 0.84 to produce the thrust force in the flow.https://www.jstage.jst.go.jp/article/transjsme/82/833/82_15-00407/_pdf/-char/enthrustplateshapefish’s finvortexcirculation |
| spellingShingle | Mitsuhiro NAKAJIMA Yoshihiro KUBOTA Osamu MOCHIZUKI Study on the thrust generated by a thin plate imitating fish’s caudal fin Nihon Kikai Gakkai ronbunshu thrust plate shape fish’s fin vortex circulation |
| title | Study on the thrust generated by a thin plate imitating fish’s caudal fin |
| title_full | Study on the thrust generated by a thin plate imitating fish’s caudal fin |
| title_fullStr | Study on the thrust generated by a thin plate imitating fish’s caudal fin |
| title_full_unstemmed | Study on the thrust generated by a thin plate imitating fish’s caudal fin |
| title_short | Study on the thrust generated by a thin plate imitating fish’s caudal fin |
| title_sort | study on the thrust generated by a thin plate imitating fish s caudal fin |
| topic | thrust plate shape fish’s fin vortex circulation |
| url | https://www.jstage.jst.go.jp/article/transjsme/82/833/82_15-00407/_pdf/-char/en |
| work_keys_str_mv | AT mitsuhironakajima studyonthethrustgeneratedbyathinplateimitatingfishscaudalfin AT yoshihirokubota studyonthethrustgeneratedbyathinplateimitatingfishscaudalfin AT osamumochizuki studyonthethrustgeneratedbyathinplateimitatingfishscaudalfin |