Rayleigh_simulation

说明：  有关单自由度自激振动模型的建立仿真过程的说明(A single degree of freedom self-excited vibration model, the simulation)

近似熵是一种衡量衡量非线性时间序列复杂性的非线性动力学分析方法，其物理意义 为熵值越大，时间序列的自我相似性越低，序 列越复杂，反之序列自我相似性越高；并且样 本熵对于序列长度依赖弱，仅需较短的数据就 能够得到稳健的熵值，同时其计算不需对数据 粗粒化，具有较好的抗干扰能力 (Approximate entropy is a measure to measure the complex nonlinear dynamics of nonlinear time series analysis method, the physical meaning of entropy value is larger, the lower the self-similarity of the time series, the more complex the sequence, whereas sequence of self-similarity the higher and the sample entropy weak dependence for the length of the sequence, only shorter data can be healthy entropy value, calculated without data coarse-grained, with good anti-jamming capability)

庞加莱截面绘制，可以自己调节参数，帮助学习(duffing poincare Poincare section drawing can adjust parameters to help learning.)

说明：  傅里叶变换能将满足一定条件的某个函数表示成三角函数（正弦和/或余弦函数）或者它们的积分的线性组合。利用傅里叶变换可对语音信号消噪。(ourier transform to meet certain conditions can be expressed as a function of trigonometric functions (sine and/or cosine functions), or their integral linear combination. Fourier transform to denoising the speech signal.)

matlab灰色预测模型问题，并求出相对误差(The problem of the matlab gray prediction model, and calculated the relative error)

说明：  清华大学数学建模讲义,可以帮助大家更好的学习数学建模这种课程.(Tsinghua University, Mathematical Modeling handouts that can help us better learning mathematical modeling of such courses.)

matlab开发的元胞自动机交通流仿真程序(matlab traffic program)

说明：  一些基本的Matlab动画程序，可以使初学者了解动画程序的应用。(Some basic Matlab animation program that allows beginners to understand the application of animation process.)

matlab快速傅里叶变换程序代码，一看就会！(Fast Fourier transform matlab code, a look will be!)

是信号处理的基础，小波包分析提取振动信号中的特征频率，用平面波展开法计算二维声子晶体带隙。( Is the basis of the signal processing, Wavelet packet analysis to extract vibration signal characteristic frequency, Computation Method D phononic bandgap plane wave.)