graychange

copmpute the risidual erro of travel time,always applied in Tomography

小波变换进行变速箱故障诊断 首先将s1和s2信号时域谱（s1代表维修前的振动信号，s2代表维修后的振动信号），画出来进行对比，会发现s1信号的振动幅值会比较高；然后对s1和s2分别进行小波分解并画出各层的时域谱，只对比s1和s2分后的最高时域谱，s2更加的具有周期性，且幅值较小，s2周期性不够明显，且振动过于密集。分析完时域谱后开始分析频谱，首先对原信号s1和s2fft转换，得到频谱图，如图，然后再对小波分析后高频部分进行fft转换，做出频谱图。对比后我们发现，在f 2375HZ出（也就是齿轮的啮合频率），s1信号频谱幅值会有急剧的升高，然后，其谐波的幅值也会增大。所以可以推断出该维修前的增速箱的齿轮可能出现问题。(Gearbox fault diagnosis based on wavelet transform s1 and s2 first time domain signal spectrum (s1 behalf of the vibration signal before maintenance, vibration signal s2 representative of repaired), drawn comparison, you will find a signal s1 vibration amplitude will be higher then s1 and s2 respectively wavelet decomposition and draw the layers of time-domain spectrum to only a maximum time domain spectroscopy s1 and s2 points after, s2 is more cyclical and smaller magnitude, s2 cyclical enough obviously, and the vibration is too dense. End domain spectral analysis after the beginning of the spectrum analysis, the first of the original signal s1 and s2fft conversion to give the spectrum, as shown, and then after the high frequency part of wavelet analysis fft transformation to make spectrum. We found that after the comparison, at f 2375HZ out (i.e. the gear mesh frequency), there will be a sharp increase in the amplitude spectrum of the signal s1, and then, the amplitude of the ha)

抛物法的matlab实现。供初学者参考。(Matlab parabolic law implementation. Reference for beginners.)

Matlab 编写的一个有关支持向量机的程序，有GUII可以设定参数，和显示最终的结果。，已通过测试。 (Matlab prepared a procedure for support vector machines, there are GUI can set parameters, and display the final result. Complete source code, has been tested. )

This source code describes the minimum frequency seperation between two signals to be orthogonal with two cases for phase differences

Grid_connected _PV_Fuzzy_MPPT-cell_model

newmark方法求解非线性振动duffing方程(newmark method for solving nonlinear vibration duffing equations)

同步发电机突然三相短路的仿真模型，由mdl和m文件构成，mdl建立了仿真模型，m文件进行数值计算，文件中有详细的注释，可移植性强，仿真结果与数值计算结果基本一致。(Synchronous generators sudden three-phase short circuit simulation model by the MDL and m files the mdl to establish the simulation model, m files for numerical calculation, detailed notes in the file, portability, simulation results and numerical results are basically the same .)

最小费用最大流算法通用Matlab函数，最短路算法的Ford和Fulkerson法迭加算(Common minimum cost maximum flow algorithm Matlab function, the shortest path algorithm of Ford and Fulkerson method of superposition operator)

一篇经典论文的代码，“Saliency,Scale,image description”，用于寻找视觉显著性的区域，matlab代码(A classic papers of the code, " Saliency, Scale, image description" , for the visual search of the area significantly, matlab code)