使用大量的有限元法求解偏微分方程，主要是基于mtlab的程序，小波包分析提取振动信号中的特征频率。- Using a large number of finite element method to solve partial differential equations, Mainly based on the mtlab procedures, Wavelet packet analysis to extract vibration signal characteristic frequen

Newmark-β法，几种程序，以求解振动微分方程(Solving oscillatory differential equations)

Duffing方程是描述共振现象、调和振动、次调和振动、拟周期振动、概周期振动、奇异吸引子和混沌现象(或随机过程)的简单数学模型。因此，在非线性振动理论中研究，Duffing方程具有重要的意义。(duffing equation slove procedure)

此程序可求解二阶微分方程振动的时域图和频域图，计算精准。(This program can solve the time domain and frequency domain of the second order differential equation vibration, and the calculation is accurate.)