Can Lighthill's Elongated Body Theory Predict Hydrodynamic Forces in Underwater Undulatory Swimming?
| Autor: | Stephen R. Turnock, Christopher W.G. Phillips, Angus P. Webb, Dominic A. Hudson |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
underwater undulatory swimming
elite sport Engineering Passive resistance business.industry Acoustics Thrust General Medicine Kinematics Torso Propulsion Sagittal plane resistance medicine.anatomical_structure MD Multidisciplinary medicine Fish locomotion propulsion Underwater business Engineering(all) Swimming Simulation elongated body theory |
| Zdroj: | Procedia Engineering. 34:724-729 |
| ISSN: | 1877-7058 |
| DOI: | 10.1016/j.proeng.2012.04.123 |
| Popis: | Underwater Undulatory Swimming (UUS) is an area of continuing development in elite swimming. The propulsiveforces generated during UUS are investigated experimentally, during an over-speed tow, and numerically using Elongated Body Theory (EBT), developed initially for fish locomotion. Two-dimensional kinematic motion data(foot, shank, thigh, torso, upper arm, lower arm, and hand) at 25Hz in the sagittal plane is acquired by manualdigitisation of video recorded from a stationary camera during an over-speed active tow and input into an EBT model.Thrust (T) determined from EBT and a semi-empirical passive resistance (R) is used to estimate R-T for comparisonwith the experimental tow line measurement. The forces predicted from EBT although significantly larger than theexperimental measurement indicate that the EBT has the potential, with suitable refinement, to provide detailedinsight into the hydrodynamics of UUS. Areas for further refinement are in the use of a three-dimensional correctionand that higher resolution motion data for the feet are required. |
| Databáze: | OpenAIRE |
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