作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
由推导出的齿端和槽端面积及其圆心矩公式，首先得出轴套（侧板）内外两侧所受的力和力矩关于齿轮基本参数的函数表达式。
Based on both the area formula of gear tooth and groove and their respective center multiplying formula, the force and moment expressions of both sides of side-panels could be brought out at first.
为了分析光镊的光驱动力和力矩，基于矩量法建立了一种新模型。
In this paper, a novel model for optical tweezers is presented to calculate the optical force and torque based on the moment method.
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