机械振动单双，连续。离散，模态测量自由度系统，《机械振动》第一章源码，-single freedom vibration system

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

用于计算单自由度结构在地震作用下的响应与反应谱-It used to calculate the response of single degree of freedom structure under earthquake response spectrum