然后用本文推导的效率公式选用合理的丝杠螺母角速比，便可得到较高的效率。
Hence by using the efficiency equations, derived in this paper, the optimum speed ratio to get higher efficiency of the screw pairs can readily be selected.
圆弧形自动门是往复摆动，其运动参数是每分钟摆动次数、摆角大小和行程速比系数等。
The circular arc automatic door is reciprocating swing, and its motion parameters are the number of swing per minute, the size of the swing Angle and the travel speed ratio coefficient.
采用多流管模型分析了H型垂直风力机展弦比和实度对其功率系数的影响，并对叶片旋转过程中攻角随尖速比的变化进行了分析。
The influence of solidity and aspect ratio on power coefficient of H-type vertical axis wind turbine, and the change of attack Angle with tip speed ratio were analyzed.
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