The numerical solution of wave propagation may be obtained by solving for the differential equation of medium motion.
通过求解介质运动做分方程，获得了波的传播问题数值解。
The numerical solution of the equation describing the motion of the floating piston pin is obtained by bringing in the conception of friction force coefficient under slide-roll condition.
引入滚滑状况下的摩擦力系数，从而求得活塞销运动方程的数值解。
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