分析了丝杠冷滚打过程中金属的流向，验证了金属流动最小阻力定律。
Metal flow of lead screw cold roll-beating process is analyzed, and metal flow's law of minimum resistance is verified.
该方法选用航空炸弹质点弹道模型，采用虚拟风洞数值模拟得到的炸弹阻力定律，结合实弹靶试数据，对弹道系数进行了符合计算。
In the method particle trajectory model of certain aviation bomb is chosen, drag law by the numerical simulation based on the virtual wind-tunnel is adopted.
根据物理定律，阻力的增加相当于平方的速度增加。
By the laws of physics, the increase in drag equals the square of the increase in speed, so even a slightly faster flight requires a lot more fuel.
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