Abstract
In order to reduce the influence of athlete’s body shape on the difficulty coefficient of diving, a more reasonable calculation method of body shape correction coefficient is proposed based on the original calculation rules of diving difficulty coefficient. First, the composition of the original diving difficulty coefficient and influencing factors is analyzed and the relationship between the various structural parts is fully clarified. Second, a coupled nonrigid body dynamics model is established and a 2-body model is used to simulate complex diving actions, and it is concluded that diving time is positively correlated with body shape. Finally, the air movement part and the water entry part of diving are discussed separately, the calculation model of the difficulty coefficient of body shape correction is established, and the original difficulty coefficient is corrected. The results show that the difficulty coefficient of each movement is obviously increased. This effectively avoids the influence of body shape on the diving difficulty coefficient.
Highlights
As the aerial posture changes, the overall moment of inertia changes, and the speed and angle of tossing and turning are accompanied in order to achieve the purpose of controlling the posture of the bent body in the air [1]
3.1.4. e Moment of Inertia. e moment of inertia is a measure of inertia of a rigid body when it rotates around an axis
It only depends on the shape, mass distribution, and position of the axis of the rigid body and has nothing to do with the state of rotation of the rigid body around the axis
Summary
E degree of difficulty of the action is reflected in the angle (or number of turns), the athlete completes in the air to toss and turn. If the difficulty of completing the tossing turn is related to body type, the difficulty coefficient of the diving movement prescribed by the FINA may not reflect fairness, and it is necessary to correct the existing difficulty coefficient. Study the aerial part and the water part of diving to establish a body shape correction difficulty coefficient calculation model, revise the original difficulty coefficient, aiming to better ensure the fairness of the competition, and at the same time, provide athletes and coaches with references when they engage in the training of diving of high degree of difficulty
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