The forced vibration of pendulum is described by four-dimensional phase space and the fourth order autonomous ordinary differential equation.
本文用四维相空间和四阶自洽常微分方程描写了单摆的受迫振动。
The equation of motion of particles has been reduced to the pendulum equation with a damping term and a forced term by using the sine_squared potential.
利用正弦平方势，把粒子运动方程化为具有运动阻尼和周期调制的摆方程。
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