抄録
Our aim of this study was clarify a mechanism about generating unsteady flow force in human swimming motion. Therefore, we tried to compare the forces obtained by using the robot arm in three methods which are a direct force measurement, a prediction by the quasi-steady theory and estimation by the flow visualization (PIV). The maximum measured force was reached 13.8N soon after the start of stroke movement in the direct force measurement method. The quasi-steady resultant force was almost constant (about 5N) from the beginning to the end. On the other hand, estimated forces based on the principle of conservation of momentum from the flow visualization corresponded to the force directly measured. These results reveal that the generating force in swimming is well explained by the momentum analysis of flow rather than by the quasi-steady theory.
