Simulation analysis of fin swimming with bi-fins

The objective of this study was to simulate the swimming motion with bi-fins and investigate the effect of ankle joint motion by simulation. A model of a swimmer was constructed by utilizing the swimming human simulation model SWUM. The bi-fin was modeled as a series of five rigid plates. One rigid...

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Autores principales:	Motomu NAKASHIMA, Takuro YONEDA, Tetsuro TANIGAWA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	swimming bi-fin simulation sports biomechanics sports engineering Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a60a6f0867b0494b9286df5dbfa54dda
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spelling	oai:doaj.org-article:a60a6f0867b0494b9286df5dbfa54dda2021-11-29T05:45:37ZSimulation analysis of fin swimming with bi-fins2187-974510.1299/mej.19-00011https://doaj.org/article/a60a6f0867b0494b9286df5dbfa54dda2019-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/4/6_19-00011/_pdf/-char/enhttps://doaj.org/toc/2187-9745The objective of this study was to simulate the swimming motion with bi-fins and investigate the effect of ankle joint motion by simulation. A model of a swimmer was constructed by utilizing the swimming human simulation model SWUM. The bi-fin was modeled as a series of five rigid plates. One rigid plate was connected to another by virtual springs and dampers. In order to determine the spring constants of the springs and damping coefficients of the dampers, static and dynamic bending tests were conducted. In order to determine the fluid force coefficients for the fin, an experiment in which the fin was located vertically in a pool and was moved horizontally by an air cylinder was conducted. In order to acquire the motion of swimming with fins, two swimmers were asked to perform maximal front crawl swimming with/without fins in an indoor swimming pool. The swimming motion was filmed by three cameras underwater and one camera on land. Using all of the input data, simulations reproducing the experimental trials were carried out. By the simulation, the developed simulation method was validated since the simulated swimming speeds were consistent with the experimental values in errors less than 6% of accuracy. By analyses with the validated simulation method, it was found that the smaller ankle joint movements resulted in a faster swimming speed. It was also found that the fixed angle of ankle joints affected the body pitch angle and that there is an optimum fixed angle for a swimmer to maximize swimming speed.Motomu NAKASHIMATakuro YONEDATetsuro TANIGAWAThe Japan Society of Mechanical Engineersarticleswimmingbi-finsimulationsports biomechanicssports engineeringMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 4, Pp 19-00011-19-00011 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	swimming bi-fin simulation sports biomechanics sports engineering Mechanical engineering and machinery TJ1-1570
spellingShingle	swimming bi-fin simulation sports biomechanics sports engineering Mechanical engineering and machinery TJ1-1570 Motomu NAKASHIMA Takuro YONEDA Tetsuro TANIGAWA Simulation analysis of fin swimming with bi-fins
description	The objective of this study was to simulate the swimming motion with bi-fins and investigate the effect of ankle joint motion by simulation. A model of a swimmer was constructed by utilizing the swimming human simulation model SWUM. The bi-fin was modeled as a series of five rigid plates. One rigid plate was connected to another by virtual springs and dampers. In order to determine the spring constants of the springs and damping coefficients of the dampers, static and dynamic bending tests were conducted. In order to determine the fluid force coefficients for the fin, an experiment in which the fin was located vertically in a pool and was moved horizontally by an air cylinder was conducted. In order to acquire the motion of swimming with fins, two swimmers were asked to perform maximal front crawl swimming with/without fins in an indoor swimming pool. The swimming motion was filmed by three cameras underwater and one camera on land. Using all of the input data, simulations reproducing the experimental trials were carried out. By the simulation, the developed simulation method was validated since the simulated swimming speeds were consistent with the experimental values in errors less than 6% of accuracy. By analyses with the validated simulation method, it was found that the smaller ankle joint movements resulted in a faster swimming speed. It was also found that the fixed angle of ankle joints affected the body pitch angle and that there is an optimum fixed angle for a swimmer to maximize swimming speed.
format	article
author	Motomu NAKASHIMA Takuro YONEDA Tetsuro TANIGAWA
author_facet	Motomu NAKASHIMA Takuro YONEDA Tetsuro TANIGAWA
author_sort	Motomu NAKASHIMA
title	Simulation analysis of fin swimming with bi-fins
title_short	Simulation analysis of fin swimming with bi-fins
title_full	Simulation analysis of fin swimming with bi-fins
title_fullStr	Simulation analysis of fin swimming with bi-fins
title_full_unstemmed	Simulation analysis of fin swimming with bi-fins
title_sort	simulation analysis of fin swimming with bi-fins
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/a60a6f0867b0494b9286df5dbfa54dda
work_keys_str_mv	AT motomunakashima simulationanalysisoffinswimmingwithbifins AT takuroyoneda simulationanalysisoffinswimmingwithbifins AT tetsurotanigawa simulationanalysisoffinswimmingwithbifins
_version_	1718407604328202240

Simulation analysis of fin swimming with bi-fins

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