风中振动时,刷毛会产生反作用力,但同时它也可以减少机翼滑流,产生一个低气压乱流,机翼上形成回力,因而减小阻力。
Vibrating in the wind, the bristles create some drag. But they also reduce the wing's slipstream, an area of low-pressure turbulence that pulls back on the wing, and hence reduce drag.
振动使土壤的抗剪强度下降是切削阻力下降的主要原因,同时,铲斗与土壤间摩擦力和粘附力下降,也是切削阻力下降的原因之一。
The main reason is that the cutting intension of soil reduced due to vibrating, and another one is the deducing of friction between bucket and soil.
打入式基桩施工引起的持续振动可引起桩周土液化,降低桩侧摩阻力,从而影响单桩承载力。
Owing to the liquefaction of soil around piles caused by sustained construction vibration the lateral resistance and bearing capacity of piles could be decreased.
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