Buoyancy is the primary source of generating bodyroll in front-crawl swimming

Yanai, Toshimasa

doi:10.1016/j.jbiomech.2003.10.004

Cited by 33 publications

(29 citation statements)

References 22 publications

(25 reference statements)

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“…In front crawl swimming, the swimmer's trunk undergoes oscillatory rolling motion about its long axis at the frequency of the stroke cycle (Yanai, 2004). To reproduce the body roll movement, the angular position of the body about its long axis was taken from the experimental work of Liu et al (1993).…”

Section: Body Roll Amplitudementioning

confidence: 99%

Effect of body roll amplitude and arm rotation speed on propulsion of arm amputee swimmers

Lecrivain

Payton

Slaouti

et al. 2010

Journal of Biomechanics

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Section: Body Roll Amplitudementioning

confidence: 99%

Effect of body roll amplitude and arm rotation speed on propulsion of arm amputee swimmers

Lecrivain

Payton

Slaouti

et al. 2010

Journal of Biomechanics

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“…There are also studies which have solved the flow around the hand and forearm by CFD (Computational Fluid Dynamics) (7) (8) . Meanwhile, with respect to the dynamics of the swimmer's whole body, several studies have measured the 'active drag', which is thought to be the dynamic drag acting on the body during swimming (9) (10) , and several other studies have discussed the roll motion, which is the characteristic motion of the crawl stroke (11) , and have examined whether buoyancy sinks the lower half of the body or not (12) .…”

Section: Introductionmentioning

confidence: 99%

Development of Swimming Human Simulation Model Considering Rigid Body Dynamics and Unsteady Fluid Force for Whole Body

Nakashima

Satou

Miura

2007

JFST

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The purpose of this study is to develop a swimming human simulation model considering rigid body dynamics and unsteady fluid force for the whole body, which will be utilized to analyze various dynamical problems in human swimming. First, the modeling methods and their formulations for the human body and the fluid force are respectively described. Second, experiments to identify the coefficients of the normal drag and the added mass are conducted by use of an experimental setup, in which a limb model rotates in the water, and its rotating angle and the bending moment at the root are measured. As the result of the identification, the present model for the fluid force was found to have satisfactory performance in order to represent the unsteady fluctuations of the experimental data, although it has 10% error. Third, a simulation for the gliding position is conducted in order to identify the tangential drag coefficient. Finally, a simulation example of standard six beat front crawl swimming is shown. The swimming speed of the simulation became a reasonable value, indicating the validity of the present simulation model, although it is 7.5% lower than the actual swimming.

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“…A real human has lungs in the breast and they are the main source of buoyancy. It also plays an important role in producing roll motion [9,13]. To keep body balance, especially about the rolling motion of the crawl stroke, cases were installed at the location of lungs keeping the front shape of the breast as shown in Fig.…”

Section: B Improvement Of the Upper Bodymentioning

confidence: 99%

“…These two actions have a complementary relationship. The roll movement makes the recovery of the arm easier and the recovering arm creates the roll moment by translating the center of gravity and buoyancy [9,13]. To improve this condition, two simulation models were constructed in which the roll movement and the recovery stroke were improved respectively.…”

Section: Modified Modelsmentioning

confidence: 99%

Free Swimming of the Swimming Humanoid Robot for the Crawl Stroke

Chung¹,

Nakashima

2013

J. Abmech

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Abstract-The objective of this study was to realize the free swimming of the crawl stroke with the previously developed swimming humanoid robot. The upper body of the robot was remodeled to fit a free swimming test. The developed robot was simulated to raise feasibility of the crawl stroke. Through the simulation, two improved models were proposed. In the experiment, the swimming humanoid robot was fitted to the two simulation models and both realized the crawl stroke successfully. The measured roll angle was about ± 60 degrees and the swimming speed was between 0.2 m/s and 0.24 m/s.

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Buoyancy is the primary source of generating bodyroll in front-crawl swimming

Cited by 33 publications

References 22 publications

Effect of body roll amplitude and arm rotation speed on propulsion of arm amputee swimmers

Effect of body roll amplitude and arm rotation speed on propulsion of arm amputee swimmers

Development of Swimming Human Simulation Model Considering Rigid Body Dynamics and Unsteady Fluid Force for Whole Body

Free Swimming of the Swimming Humanoid Robot for the Crawl Stroke

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