A more precision formula for the period of a simple pendulum is obtained by using the method of variable be partly fixed.
利用“局部常化”方法给出了一个精度较高的单摆周期公式。
A new method for analyzing twin-blade fixed-pitch propeller was proposed based on the theory of corrected blade foil and aerodynamic formula of 3-d wing.
基于叶素修正理论和三维机翼气动系数计算公式，提出了一种分析双叶定距螺旋桨的新方法。
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