A38 PIVと動作分析法の同期システムの構築とクロール泳者への適用(水泳)

概要

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Flow fields around a swimmer are extremely unsteady. Top swimmers are expected to swim using effectively unsteady flow force. Particle Image Velocimetry (PIV) can visualize the unsteady flow field around swimmer's hand. A motion analysis can evaluate the unsteady motion of swimmer quantitatively. In the traditional study, however, PIV and a motion analysis were carried out individually. In this study, we construct a synchronized system of two methods, and apply the system to a front crawl swimmer, in order to clarify the relationship between the motion of swimmer's hand and the vortex generated from it at the same time. To combine two methods, we illuminated swimmer's hand with the red lights, and separated the light by passing it through Laser Line Band Pass Filter and Red Band Pass Filter for PIV (532±2nm) and for High-speed camera (640〜700nm), respectively. To get synchronized images, we reconciled the first shutter timing in the methods using a pulse generator and setting the shutter period to 72ms in PIV and 8ms in a motion analysis. By applying the synchronized system to a swimmer, we succeeded in getting images synchronized by 72ms.
2007-11-13