用四阶龙格库塔法解决常微分方程边值问题，具体来说就是打靶问题-The fourth-order Runge-Kutta method to solve ordinary differential equations, specifically targeting the problem

单自由度系统对初始条件和简谐激励相应 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。-Single degree of freedom system to initial conditions and the corresponding harmonic excitation Special general solution of the equations of motion and initial conditions b