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首页> 外文会议>Asia-Pacific Congress on Sports Technology >Dynamics of spin bowling: the normalized precession of the spin axis analysed with a smart cricket ball
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Dynamics of spin bowling: the normalized precession of the spin axis analysed with a smart cricket ball

机译：旋转保龄球的动态：用智能板球分析旋转轴的标准化进展

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As torque is imparted on a cricket ball before release, the spin vector precesses into the torque vector. Normalising the precession speed to the torque and the angular velocity yields the 'normalised precession', i.e. the angle between the spin vector and the torque vector. The maximal normalised precession was analysed in spin bowling, specifically in finger-and wrist spin, and topspin, sidespin and backspin deliveries. The data were recorded with a smart cricket ball and a Cortex motion analysis system. The maximal normalised precession at the beginning of the finger torque increased from topspin to backspin. The reason for this behaviour is that the motion of the bowling arm imparts a topspin on the ball, and therefore the spin axis does not have to change its direction if the fingers impart further topspin on the ball.
机译：由于在释放之前在蟋蟀球上施加扭矩，将旋转载体飞行进入扭矩载体。向扭矩归一化压缩速度，角速度产生“归一化进出”，即旋转矢量与扭矩矢量之间的角度。在旋转保龄球中分析了最大归一化的预序，特别是在手指和腕部旋转，以及TopSpin，SideSpin和Backspin交付中。使用智能蟋蟀球和皮质运动分析系统记录数据。手指扭矩开始时的最大归一化进程从TopSpin增加到后旋。这种行为的原因是保龄球的运动赋予球上的圆形素，因此如果手指赋予球上的另外的底板，则旋转轴不必改变其方向。

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