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Description: 由本人改编自C程序的一个三次样条曲线模拟正弦波程序源码,有兴趣的可以看看.-from C procedures adapted from a cubic spline curve simulated sine wave source procedures are interested can look at.
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Size: 2849 |
Author: 王力 |
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Description: 首先，找出 上所有的极值点，然后用三次样条函数曲线循序连接所有的极大值点，得到信号 的上包络线 ，采用同样的方法连接所有的极小值点，得到 的下包络线 。循序连接上、下两条包络线的均值可得到一条均值线 ：
（7－1）
再用 减去 得到 ：
（7－2）
如果 满足IMF的两个条件，则 即为第一阶IMF，一般来说， 并不满足条件，此时，将 当作新的信号，重复上述步骤，即得：
（7－3）
这里， 为 的上、下包络线的均值。如果 仍然不满足IMF的条件，则继续筛选，重复上述方法k次，得到 ：
（7－4）
在实际计算中，满足IMF的两个条件并不是一件容易的事，必须确定一个准则使筛选过程能够终止，Huang等提出可以利用两个连续处理结果之间的标准差SD来作为判据：
（7－5）
其中，T为原始信号的长度。决定筛选过程是否终止，SD值的选取是至关重要的。如果SD的值选的过小，会使IMF分量变成纯粹的频率调制信号，造成幅值恒定；如果选的过大，会使筛选的结果和IMF的两个条件相差太远。经验表明，SD的取值在0.2～0.3之间时为宜，既可保证IMF分量的线性稳定性，又可使IMF分量具有相应的物理意义。
当式（7－4）中的 满足SD值的要求时， 即为第一阶IMF，记为 ：
（7－6）
第一阶IMF 包含着原始信号 的频率最高成份。从 中减去 得到频率较低的剩余信号，即残差 ：
(7－7)
将 看作一新信号，重复上述EMD分解过程，经过多次运算可得到全部残差 ：
（7－8）
当满足以下两个条件之一时，整个筛选过程即可终止。这两个条件是：（1） 或 小于预定的误差；（2） 为一单调函数，此时不可能再从中提取IMF分量。即使原始信号数据具有全局零均值，其最后的剩余分量仍可能不是零，对于有趋势的数据，其剩余分量就应该是该数据的趋势
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Size: 491 |
Author: littleprince |
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Description: 板中导波传播频散曲线求解C语言代码
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Size: 10389 |
Author: fei2009xue |
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Description: 自己写的一个方波，正弦波的滤波及曲线显示-himself wrote a square wave, sine wave filtering and curve
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Size: 245760 |
Author: 黄伟 |
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Description: 小波的程序，可以进行n维小波变换，显示曲线对比，是一个非常不错的程序-A wavelet program, can perform n dimension transform, display curve graph for comparision. not bad program
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Size: 366592 |
Author: 贾琦 |
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Description: 西安交大一个博士提出的小波分析变换的新型算法，对小波有兴趣的人可以研读一下，很有启发！-A PHD of Xi an jiaotong University presents a new algorithm of wavelet transform. It a very useful for those who are interested in wavelet.
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Size: 142336 |
Author: 马占寅 |
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Description: 由本人改编自C程序的一个三次样条曲线模拟正弦波程序源码,有兴趣的可以看看.-from C procedures adapted from a cubic spline curve simulated sine wave source procedures are interested can look at.
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Size: 3072 |
Author: 王力 |
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Description: 弹性波中瑞雷波的正演计算。求解多层瑞雷波频散曲线。计算速度快。（专业小软件）-elastic wave Rayleigh wave to the calculation. Solving multi-storey Rayleigh wave dispersion curves. Calculation speed. (Professional small software)
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Size: 10240 |
Author: 亲镇 |
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Description: 用小波绘制分形混浊曲线、Julia集、和Mandelbrot集，程序运行后，分别选择菜单“分形”下的子菜单“混沌曲线”、“Julia集”或者“Mandelbrot集”，将分别绘制这几种分形图案。对于Mandelbrot集，可以用托动鼠标选择一矩形框，然后点击鼠标右键对所选择的区域进行放大。-Wavelet Fractal stuffy drawing curves, Julia sets, and Mandelbrot sets, after running, select the menu "fractal" submenu under the "chaotic curve," "Julia Set" or "Mandelbrot Set", which will draw several fractal patterns. For the Mandelbrot Set, you can use a mouse and asked to choose a rectangular box, Then click the right mouse button on the choice of amplification region.
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Size: 57344 |
Author: |
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Description: 针对医疗中的心电信号，利用奇异性检测的方法检测R波的位置,并给出模极大曲线-against the medical ECG, the use of the singular method of detection of R-wave detection of the location, and gives modulus maxima curve
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Size: 1024 |
Author: 黄海滨 |
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Description: 超声兰姆波用于无损检测，求解其相速度频散曲线，群速度频散曲线(ultrasonic lamb wave)
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Size: 7230464 |
Author: flyingbly
|
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Description: 应用W-M函数建立了分形粗糙表面轮廓，用小波变换对其进行分解，考察了小波变换方法对原轮廓曲线的还原情况(The fractal rough surface profile is established by W-M function, and the wavelet transform is used to decompose it. The reduction of the original contour curve is investigated by the wavelet transform method.)
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Size: 1024 |
Author: add001 |
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Description: lamb频散曲线，包括相速度和群速度随频厚积的变化(Lambish dispersion curves, including changes in phase velocities and group velocity with frequency-thickness product)
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Size: 126976 |
Author: ilalalal |
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Description: 这是用于求解p波,sv波入射的zoeppritz方程的代码，用于画出AVO曲线，合成地震记录道等。(This is the code for solving the Zoeppritz equation of P wave and SV wave incident. It is used for drawing AVO curves, synthesizing seismic traces, etc.)
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Size: 59392 |
Author: 苜蓿小天 |
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Description: Lamb波的频散曲线是进行超声Lamb波无损检测的重要依据。本程序对Rayleigh2Lamb方程进行了分析，给出了无限大板中Lamb波频散曲线的数值计算方法，通过Matlab软件对求解过程进行编程，绘制出Lamb波在铝板中传播的相速度和群速度曲线，并通过试验进行了验证对推广应用Lamb波进行无损检测具有实际意义。(The dispersion curve of Lamb wave is an important basis for non-destructive testing of ultrasonic Lamb wave. In this program, Rayleigh 2Lamb equation is analyzed, and the numerical calculation method of Lamb wave dispersion curve in infinite plate is given. The solving process is programmed by MATLAB software, and the phase velocity and group velocity curves of Lamb wave propagating in aluminum plate are plotted. The non-destructive testing of popularizing Lamb wave is carried out through experiments. The measurement is of practical significance.)
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Size: 13312 |
Author: OldDriver集中营 |
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Description: 在前人工作的基础上对三层层状介质的瑞利波频散曲线进行了正演模拟研究，对假定的几组典型模型参数的频散曲线进行了认真分析。通过分析可知，各频散曲线之间是互不相交的，从而对此问题有了一个更清晰的认识。指出当低速软弱夹层存在时频散曲线的特点，并根据分析结果，说明”之“字形频散曲线的形成机理。(On the basis of previous work, the Rayleigh wave dispersion curves of three layered media are studied by forward simulation, and the dispersion curves of some assumed typical model parameters are carefully analyzed. Through the analysis, we can see that the dispersion curves are not intersected with each other, so we have a clearer understanding of this problem. It is pointed out that the characteristic of time dispersion curve exists in low-speed weak interlayer, and according to the analysis results, the formation mechanism of zigzag dispersion curve is explained.)
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Size: 105472 |
Author: OldDriver集中营 |
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Description: Lame波的频散曲线，包括相速度和群速度。(The dispersion curve of Lame wave includes phase velocity and group velocity.)
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Size: 441344 |
Author: Ambiton |
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Description: 基于matlab的lamb波频散曲线仿真(Lamb wave dispersion curve simulation based on matlab)
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Size: 13312 |
Author: 6ww39elu |
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Description: 根据以下的平板光波导折射率数据：
（1）作出不同波导芯层厚度 ( )对应的 模式与 模式的色散图；
（2）给出满足单模与双模传输的波导厚度范围；
（3）确定包层所需的最小厚度 与 的值。(According to the following refractive index data of planar optical waveguide:
(1) The dispersion diagrams of modes and modes corresponding to different thickness of waveguide core layer () are made;
(2) The range of waveguide thickness for single mode and dual-mode transmission is given;
(3) Determine the minimum thickness and value required for cladding.)
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Size: 36864 |
Author: z2190610 |
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