中文说明：由单自由度的运动方程和初始条件得到二阶非齐次常微分方程，它的解有对应的齐次方程的通解和非齐次方程的特接构成。
English Description：
Composed of single degree of freedom of motion equation and the initial conditions are second order non-homogeneous differential equation and its solutions have the general solution of the corresponding homogeneous equation and homogeneous equation form.