Through the discussion of the resistance properties of natural ventilation induced by wind force, a method of local pressure loss superposition was proposed to calculate the pressure loss.

探讨了风压作用下大开口的自然通风阻力特性，并提出了用局部损失迭加法来计算阻力损失，即认为通过建筑物的气流是由不同的突缩段和突扩段的组合。

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The model of system loss model caused by wind resistance and bearing friction is established based on the regression analysis of flywheel's free brake curve.

通过对飞轮的自由刹车曲线进行回归分析，得出由风阻和轴承磨损等引起的系统损耗模型。

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