BPSK_molding

为了精准、稳定地提取滚动轴承故障特征，提出了基于变分模态分解和奇异值分解的特征提取方法，采用标准模糊C均值聚类(fuzzy C means clustering, FCM)进行故障识 别。对同一负荷下的已知故障信号进行变分模态分解，利用 奇异值分解技术进一步提取各模态特征，通过FCM形成标准聚类中心，采用海明贴近度对测试样本进行分类，并通过计算分类系数和“卜均模糊嫡对分类性能进行评价，将该方法 应用于滚动轴承变负荷故障诊断。通过与基于经验模态分解的特征提取方法对比，该方法对标准FCM初始化条件小敏感，在同负荷故障诊断中表现出更好的分类性能 变负荷故障诊断时，除外圈故障特征线发生明显迁移，其他测试样本故障特征线仍在原聚类中心附近，整体故障识别率保持在100 ，因此，该方法能精确、稳定提取故障特征，为实际滚动轴承智能故障诊断提供参考。( In order to extract fault features of rolling bearing precisely and steadily, a method which is based on variational mode decomposition(VMD) and singular value decomposition was proposed for fault diagnosis using standard fuzzy C means clustering(FCM). First of all, the known fault signals measured in the same load but with different faults were decomposed by VMD, and the modes characteristics were further extracted using singular value decomposition technique,forming the standard clustering centers by FCM, and then the test samples were clustered by a Hamming nearness approach, and the classification performance was uated by calculating classification coefficient and average fuzzy entropy. At last, the method was applied in rolling bearing fault diagnosis under variable loads. By comparing with a method based on EMD, this approach is not sensitive to the initialization of standard FCM, and exhibits better classification performance in the same load fault diagnosis Fo)

回归算法，输出回归方程系数，平方和，剩余平方和等。(Regression algorithm, the output coefficient of the regression equation, sum of squares, residual sum of squares and so on.)

MATLAB7.0辅助信号处理技术与应用，一本讲matlab，不错的电子书籍(MATLAB7.0 auxiliary signal processing techniques and applications)

OFDM，包括OFDM调制与解调，经过验证，仿真通过，可用于本科论文毕设。(OFDM, including OFDM modulation and demodulation, after verification, by simulation, can be used in the undergraduate thesis project.)

本文提出了基于二维混沌映射的数字图像水印算法，混沌具有随机性、似噪声及对初始条件的极端敏感性等特点。将经过二维混沌映射置乱后的数字水印信号嵌入图像小波域的低频系数，实现了数字水印的隐蔽性、保密性和稳固性；利用二维混沌映射Arnold变换对水印信号进行置乱，不仅增强了水印信号保密性，同时有效提高了视觉上抵抗图像剪切攻击的能力(failed to translate)

本书为一本电力电子与MATLAB结合的应用性书籍，做仿真的人可以参考了(This book is a combination of power electronics applications with MATLAB of books, so people can reference simulation)

说明：  图像二值化C程序，供matlab M文件调用，图像模式识别前预处理第一步骤(Binarization C procedures, calling for the matlab M documents, images, pre-first step before pattern recognition)

a simple way to detect and analyse Abnormal crowd

This a program for Monte carlo computation for Pi

matlab code to calculate active leve of speech