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.
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。
2
In the SPM method the composite hypothesis test is performed by means of the monotonic characteristic of the even order statistical phase momentsof MPSK signals.