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有关人类游泳的文献中,一般认为被动阻力随速度的平方增加,即Fd/v~2为常数(Fd为阻力,v为游泳速度)。但主动阻力与速度的关系还不明确,不同研究者持不同观点。本文采用一种直接方法测量,在水中放置一系列的垫,由一根长杆相连,通过杆把受力记录下来。参加测试的都是训练有素的男女运动员,其中有国家级冠军和奥运会冠军。每个被测试者以不同速度游10次,每次记录平均速度与平均阻力。数据用最小二乘法处理,回归曲线为Fd=Av~6。结果是b的平均值为2.15±0.24,即对于不同游泳者,Fd/v~2随v的变化是有升有降,而Fd/v~2的平均值随v的增加略有上升。如果尽可能使
In the literature on human swimming, it is generally considered that the passive resistance increases with the square of the velocity, that is, Fd / v ~ 2 is constant (Fd is resistance and v is swimming speed). However, the relationship between active resistance and speed is not clear, and different researchers hold different views. This article uses a direct method of measuring, placing a series of pads in water, connected by a long bar, and recording the force through the bar. The tested men and women were well-trained athletes, including national champions and Olympic champions. Each subject traveled 10 times at different speeds, each recording average speed and average resistance. The data were processed by least square method and the regression curve was Fd = Av ~ 6. As a result, the average value of b was 2.15 ± 0.24, that is, for different swimmers, the change of Fd / v ~ 2 increased or decreased with the change of v, while the average value of Fd / v ~ 2 increased slightly with the increase of v. If you can