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energy-leakage--dual-tree
首先根据高斯白噪声频率充满整个频带的特性，通过双树复小波包变换对高斯白噪声进行分解，利用频带能量泄漏的定量分析方法，验证了双树复小波包变换具有较低的频带能量泄漏特性；其次利用双树复小波包变换逐层分解信号，对每层分解所得分量求其FFT谱的峭度，得到基于双树复小波包变换的谱峭度图，根据图中峭度最大的原则，可以自动准确的选择信号分解最佳层数和最佳分量；最后将基于双树复小波包变换的谱峭度图的故障诊断方法应用于实际工程中，对齿轮故障振动信号进行分析，选择最佳分解层数和分量后利用希尔伯特包络解调，有效准确地提取了故障特征信息，验证了方法的可行性和有效性(The parameters of a filter were determined by experience, and that has a great influence on the
results of signal processing. The discrete wavelet packet transform has a larger energy leakage of frequency band,
which obviously affected the results of the envelope demodulation. It is necessary to have a method with a lower
energy leakage of the frequency band before envelope demodulation. The dual tree complex wavelet packet
transform (DT-CWPT) was a new signal processing method that had many good qualities. Because the energy
leakage of the frequency band was smaller when the signal was decomposed by a dual tree complex wavelet
packet transform, the dual tree complex wavelet packet transform was used to extract the fault feature information
in the field of fault diagnosis. In this paper, first, according to the characteristics of Gaussian white noise, whose
frequency was full of the whole frequency band, Gaussian white noise was decomposed by a dual-tree complex
wavel)
- 2014-05-28 17:13:41下载
- 积分：1
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Untitled2
可以用最小二乘法来提取趋势项。在MATLAB中可利用它的函数来计算(Least squares method can be used to extract the trend items. It can be used in MATLAB to calculate the function)
- 2011-07-29 19:02:04下载
- 积分：1
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zheng
正入射的自由曲面透镜设计，计算获得透镜的二维坐标(The free-form surface lens is incident on the design, the two-dimensional coordinates of the lens calculated)
- 2021-04-13 18:58:56下载
- 积分：1
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PQ-chaoliujisuan
利用快速解耦法进行电力系统潮流计算，对配电网进行潮流计算(Use of PQ decomposition method for the electric power flow calculation system)
- 2012-04-26 09:42:35下载
- 积分：1
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ansys2
【ansys基本建模算例】带法兰油缸的有限元分析，计算相关应力即变形([Examples] basic modeling ansys finite element analysis with flanged cylinder, calculating the stress that is associated deformation)
- 2014-05-04 20:39:30下载
- 积分：1
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wudianchafen
五点差分法(matlab)解椭圆型偏微分方程方程,分法,偏分,五点差分,椭圆型,偏微分方程(Five-point difference method (matlab) solutions of elliptic partial differential equations, sub-law, partial points, five-point difference, elliptic partial differential equations)
- 2013-09-23 16:58:30下载
- 积分：1
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S-S-RAO_optimization-engg.pdf
optimization engineering text book by s.s.rao
- 2012-12-07 08:01:54下载
- 积分：1
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FFTandIFFT
傅里叶变换FFT和逆傅里叶变换IFFT
欢迎大家喜欢(FFT and IFFT)
- 2009-03-24 20:05:19下载
- 积分：1
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Fitting_Gumbel
对轨道不平顺采用耿贝尔分布进行拟合优度检验(On track irregularity using Gumbel distribution goodness of fit test)
- 2014-11-20 20:30:15下载
- 积分：1
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big-intger-plus-minus-multiply
C语言实现大数的加法减法以及乘法,水平限于仅仅大学生水平学习使用。(Use C language to achieve that addition, subtraction, and multiplication of a big intger.)
- 2013-05-11 13:52:20下载
- 积分：1
