查询词典 pseudo-ginseng

They applied smoothed pseudo Wigner–Ville distribution [1,2], order tracking and time domain averaging techniques to distinguish faults in the gears.

他们应用平滑伪Wigner - Ville分布 [ 1，2 ] ，订单跟踪和时域平均技术，以区分故障的齿轮。

Compared with Smoothed Pseudo Wigner-Ville Distribution,this algorithm can reduce the cost of computation,save operation time under the situation that keep approximate performance and is suitable for real-time analyzing.

与平滑伪维格纳分布相比，在保持相似性能的情况下，该算法运算量比较小，可以有效地节约运算时间，适合于快速跳频信号的实时分析。

Time-Frequency analysis method is applied to the analysis of PEC signals with the aim of discriminating the occurrence of corrosion from the simultaneous variations of lift-off, smoothed pseudo Wigner-Ville distribution is used to get the signal spectrum map. The method of extracting the lowest energy area as the classification eigenvalue is proposed, and a good classification result is acquired.

采用时频分析的方法对同时出现腐蚀缺陷和提离变化的情况进行了识别，利用平滑的伪Wigner-Ville分布得到了信号的谱图，提出了提取谱图中最低能量区域面积作为特征量进行识别的方法，取得了较好的识别效果。

Time-frequency analysis ; fractional Fourier transform ; pseudo Wigner distribution; chirp signal ; short-time Fourier transform

时频分析；分数阶傅里叶变换；伪维格纳分布； chirp信号；短时傅里叶变换

In addition, the smooth pseudo Wigner-Vile distribution, instead of the direct WVD, could reduce or remove the cross-terms interfere.

在较低信噪比条件下，经过SPWVD变换后信号能量将偏离信号的瞬时频率所在处，给频率估计带来有偏误差。

The HHT is applied to array acoustic logging signal processing, and EMD is used to decompose the signal into several IMF, and then the smooth pseudo Wigner-Ville distribution is obtained.

将该方法应用于阵列声波测井信号处理上，对声波测井信号进行经验模态分解并得到各阶IMF，对IMF分量作平滑伪Wigner-Ville时频分布，通过分析得到干层与水层之间的差异。

Key words:singular value decomposition;pseudo signal subspace;time-frequency distribution;Radon-STFT transform;rotation of time-frequency plane

本文提出一种Radon-STFT变换，该变换能鲁棒地确定LFM信号在时频平面上的倾斜角度，因而可以有效地克服文［3］的缺憾。

The time-frequency representations of the EEG signals are computed by the modified pseudo Wigner distribution method. The method can reduce or remove the cross terms efficiently and perform fast.

采用改进的伪Wigner分布对脑电信号进行时频变换，这种时频分布不仅能够有效地消除交叉项，而且可以快速实现。

At the first step, time-frequency distribution (spectrogram or pseudo Wigner-Ville distribution) of the time-varying signal is adopted and a peak-tracking scheme is designed to obtain a coarse ionosperic modulation estimation from the time-frequency distribution.

在第一步校正中，首先分析这种时变信号的时频分布，并设计了一种谱峰追踪方法从时频分布中获得粗糙的电离层频率调制估计。

Based on Wavelet Packet Analysis and Smoothed Pseudo Wigner-Ville Distribution, the experiment data is time-frequency analyzed. The experimental results indicate that the amplitude of the laser-induced acoustic waves increases with the laser energy; the frequency coverage is from 0 to 150 KHz, and in the meantime there is a peak located at about 25 KHz. In addition, the spectrum and the peak of frequency are basically stable in spite of the change of laser energy and target texture.

从基本的空泡动力学理论出发，推导了空泡各特征参量之间的关系，进而对空泡动力学模型进行了修正；采用有限差分法对空泡脉动进行数值模拟，得到了空泡脉动特性随液体粘性、空泡含气量、表面张力以及可压缩性的变化规律；实验上采用光偏转测试装置探测了激光空泡脉动以及空泡溃灭的细节过程，进而分析了液体粘性和作用激光能量对空泡脉动周期、泡半径及泡能等特征参数的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。