笔者将在此基础上．推导出履带式拖拉机的车辙大小的理论公式及其沿疏松土地行走时的运动阻力系数。
Based on the achievements obtained. the theoretic formula that determine the rut size of the caterpillar tractor and the friction drag coefficient of motion was deduced.
在低雷诺数条件下，对于纯俯仰运动，随着翼型厚度的减小，平均阻力系数也变小。
For pure pitching motion, the results show that average drag coefficient decreases as airfoil thickness is reduced.
根据试验结果和建立的运动方程，获得阻力系数与圆管形状的关系，并计算了圆管所受到的拖曳力。
Based on the test results and movement equation established, the relationship between drag coefficient and tubular shape is obtained and the drag force imposed on pipe is calculated.
应用设计的装置实测了一些运动员在自由泳和蛙泳时的动态阻力和阻力系数。
The active drag and hydrodynamic force coefficient were measured for athletes swimming both freestyle and breaststroke.
鉴于紊流运动的复杂性，其沿程阻力系数确定起来较为困难。
Because of the complexity of turbulent flow, it is a tough issue to determine its friction factor.
结果表明：摇摆条件下摩擦阻力系数随时间周期性波动，波动周期等于摇摆运动周期。
The results show that the friction coefficient in rolling condition fluctuates with time and the period is equal to that of rolling movement.
雷诺数越小，摇摆运动的周期越小，最大摇摆角度越大时，实验段摩擦阻力系数波动幅值越大。
The smaller the Reynolds number is, the smaller the rolling period is, and the greater the maximum rolling Angle is, the greater the fluctuations in amplitude of the friction coefficient are.
雷诺数越小，摇摆运动的周期越小，最大摇摆角度越大时，实验段摩擦阻力系数波动幅值越大。
The smaller the Reynolds number is, the smaller the rolling period is, and the greater the maximum rolling Angle is, the greater the fluctuations in amplitude of the friction coefficient are.
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