Untitledday1b

matlab产生随机信号，用BT法计算归一化功率(Generate random signal)

利用matlab画出系统在一定参数下的分叉图，并观察得到的分叉图了解系统可能发生的变化(Using matlab draw system under certain parameter bifurcation diagram and observe the changes resulting bifurcation diagrams for the system may occur)

subband filter in matlab.

本程序实现了：船舶运动控制中的模型参数拟合过程与实现。(Modelling parameters fitting and realize in the boat dynamic controll.)

实现求圆形、三角形、矩形的面积和周长。要求和说明如下： (一) 定义接口sharp接口 (二) 通过实现接口定义Rect、Triangle、Circle的类，并且一个构造方法，并实现求面积和周长的方法（其中三角形斜边的计算公式c=Math.sqrt (width * width + height * height ) ） (Seeking to achieve circular, triangular, rectangular area and perimeter. Requirements and are described as follows: (a) define the interface sharp interfaces (two) by implementing the interface definition Rect, Triangle, Circle of class and a constructor method, and implement methods for the area and perimeter (where the hypotenuse of the triangle formula c = Math.sqrt (width* width+ height* height) ))

离散型永磁同步电机滑模控制，采用锁相环实现角度估算，角度误差低，效果好。(PMSM_SMO_PLL,test is good.)

在matlab/simulink中建立无刷直流电机的模型，在模型的基础上采用三闭环控制实现无刷直流电机的位置精确控制(In matlab/simulink establish in brushless dc motor model, based on the model using the three closed-loop control achieve brushless dc motor position accurate control )

1) Alamouti STBC Matlab codes

说明：  负荷频率控制（LFC）是调整系统的频率达到额定值（如50HZ）或/和维持区域联络线交换功率为计划值。频率稳定是电力系统电能质量的一个重要指标。负荷的任意突然变化都有可能导致系统间联络线交换功率的偏差及系统频率的波动。因此，为保证电能质量，需要一个负荷频率控制(load frequency control,LFC)系统，该系统的目的是将系统频率维持在标称值并且尽可能使控制区域之间的未计划的联络线交换功率最小。(Load frequency control (LFC) is to adjust the frequency of the system to reach the rated value (such as 50 Hz) or / and maintain the exchange power of the regional tie line to the planned value. Frequency stability is an important index of power quality in power system. Any sudden change of load may lead to the deviation of power exchange between tie lines and the fluctuation of system frequency. Therefore, in order to ensure the power quality, a load frequency control (LFC) system is needed. The purpose of the system is to maintain the system frequency at the nominal value and minimize the unplanned tie line exchange power between the control areas.)

一种改进的小波gorrant阈值处理消除噪声程序。并且比较了硬处理，软处理的对比信噪比和均方误差值的大小。(An improved wavelet gorrant threshold processing to eliminate the noise. And compared the hard processing, the contrast of soft handle signal-to-noise ratio and the size of the mean square error (mse) value.)