使用大量的有限元法求解偏微分方程，进行逐步线性回归，基于人工神经网络的常用数字信号调制，IMC-PID是利用内模控制原理来对PID参数进行计算，有CDF三角函数曲线/三维曲线图。-Using a large number of finite element method to solve partial differential equations, Stepwise linear regression, The commonly used digital signal modulation b