THD

说明：  地震工程用于生成匹配设计谱的时域调整记录(Time domain adjustment record for matching design spectrum generation in seismic engineering)

The power electronic drive controls the rate of induction motor by V/F method.

NPC三电平逆变器SVPWM仿真模型，平台matlab2007。(NPC three level inverter SVPWM simulation model, platform MATLAB2007.)

说明：  对spwm进行仿真时的参数调整以达到实现变频调速仿真目的(Parameter adjustment in SPWM simulation to achieve the purpose of variable frequency speed control simulation)

OPCSERVER源代码(OPCSERVER source code)

选取四个点，自动判断是否在一个平面上。同一个平面上。则绘制一个多边形。不在一个平面，则以前三个点为底面，构成一个椎体。支持Move等转换命令，存图与开图，实现Jig交互绘制等。(Four points are selected to automatically determine whether or not they are on a plane. On the same plane. Draw a polygon. If it is not in a plane, the first three points are at the bottom, forming a vertebral body. Support Move and other conversion commands, save and open maps, Jig interactive rendering, etc.)

说明：  轴承故障诊断，自己编写的基础EMD分解程序，实测很好用。(Bearing fault diagnosis, self-compiled basic EMD decomposition program, the actual measurement is very useful.)

说明：  基于自相关算法的通信系统中微弱信号检测程序(Weak Signal Detection Program in Communication System Based on Autocorrelation Algorithms)

说明：  基于MATLAB的飞机六自由度模型，可以说具有很强的实用性和普适性(The six-degree-of-freedom model of aircraft based on MATLAB can be said to have strong practicability and universality.)

SoX (Sound eXchange) is the Swiss Army knife of sound processing tools: it can convert sound files between many different file formats & audio devices, and can apply many sound effects & transformations, as well as doing basic analysis and providing input to more capable analysis and plotting tools.