提出了一种基于局域波时频图像的盲源分离故障诊断方法。
The blind source separation fault diagnosis method based on Local wave time-frequency images is developed.
在时域、频域分析方法的基础上，论述了一种时频域分析方法这——局域波法。
On the basis of the methods above, the method of time-frequency analysis: local wave method is introduced.
振动信号能量在局域波时频分布中的变化，是局域波法诊断齿轮磨损故障的特征。
The energy variation of vibration signals is the features of gearbox-case fault diagnosis.
由于局域波时频谱可以表示为灰度图像。因此，利用图像信息的不变矩进行故障特征提取。
Because the Local wave T-F spectrum can be showed in the gray image, so we use the moment invariants of time-frequency image as the fault features.
从特征信号提取的角度出发，采用局域波时频分析和信息熵结合的方法进行往复式压缩机故障诊断。
In the view of feature signal extraction, the local wave time-frequency analysis and information entropy were used to deal with fault diagnosis.
在局域波理论的基础上，引入了时频局部能量的概念，进而提出了一种基于时频局部能量的特征提取方法。
The concept of local energy in time-frequency plane, based on local wave theory, is defined. Then a new feature extraction method based on the local energy in time-frequency plane is given.
利用局域波法将微弱的故障信号分解为有限的并且具有不同基本模式的分量，每个分量是单一成分信号，实现了信噪分离。
Weak fault signal was divided into finite local wave components with different simple-intrinsic modes, so that signal was separated from noise.
研究表明，在非均匀磁场情况下，阿尔芬波通过自相互作用也可以形成局域涡旋结构。
The result shows that in the presence of inhomogeneous magnetic field. the shear Alfvenwaves will be able to form localized vortex structures through their self-interactions.
提出一种基于最大后验和非局域约束的非下采样轮廓波变换域SAR图像去噪方法。
An algorithm of SAR image denoising in nonsubsampled contourlet transform (NSCT) domain based on maximum a posteriori (MAP) and non-local (NL) restriction is proposed.
对此局域模性质的研究有助于声波或弹性波滤波器的制作。
This study to the properties of the localized modes is useful to the fabrication of the acoustic or elastic wave filters.
利用局域体全息的耦合波理论，计算了该透镜衍射光的振幅分布和衍射效率。
On the basis of the coupled-wave theory of local volume holography, the amplitude distribution and the diffraction efficiency of the diffracted beams are calculated.
结果表明，中间耦合会出现自旋波的共振局域现象。
It is shown that resonant confined models of spin wares occurs when the interface coupling is moderately strong.
分波局域态密度给出了体系中各原子间的轨道相互作用。
Partial-wave local density of slates gave interactions between atoms.
小波变换具有分析性质好和时—频局域化好的特性，而谱白化方法是高分辨处理中一种有效的频率补偿手段。
Wavelet transform has a good analyzing feature and a good time frequency localization. Spectrum whitening is a effective tool of frequency compensation in high resolution processing.
引入了局域小波能谱的局域间歇性度量，分析了不同风速下的风浪资料，结果表明，局域小波能谱可依局域频率分为三部分。
Local intermittency measure is introduced to study the properties of local wavelet energy spectrum and to analyze the wind wave data obtained in a wind wave channel.
基于小波变换，引入了能刻画风浪局域结构的局域小波能谱。
Based on the wavelet transform, the present paper introduces a kind of wind waves energy distribution, the so-called local wavelet energy spectrum, into studies of wind waves.
本文基于局域密度泛函理论（LDF）和LMTO-ASA方法，计算了稳定的六角结构碳化钨和碳化钼的自洽能带结构，总态密度和分波态密度。
The self-consistent band structure, total and partial density of states for the stable compounds hcp-WC and MoC are calculated by the LMTO-ASA method based on Kohn-Sham's LDF theory.
本文基于局域密度泛函理论（LDF）和LMTO-ASA方法，计算了稳定的六角结构碳化钨和碳化钼的自洽能带结构，总态密度和分波态密度。
The self-consistent band structure, total and partial density of states for the stable compounds hcp-WC and MoC are calculated by the LMTO-ASA method based on Kohn-Sham's LDF theory.
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