frequency component

On the basis of wavelet analysis a three-dimensional time-frequency pattern to characterize partial discharge ( PD) impulse signal is upbuilt which comprehensively shows three basic features of PD impulse signals: time component, frequency component and distribution of discharging energy.

根据小波理论建立了表征局部放电脉冲信号的三维时频谱图，该三维谱图综合反映了局放脉冲信号的3个基本特征：时间分量、频率分量和放电能量的分布。

The precisions of ratio rectifying method is very rough when it was applied to the case of low frequency component, of which the reason was that the contribution from negative frequency not taken into the model.

采用比值法校正低频成分的参数精度比较低，其原因是模型中忽略了负频率成分的贡献。

Logarithmic Transformation to Joint Power Spectrum can enhance the intensity of high frequency component, improve the modulation degree, weigh down the zero-order diffraction, and increase the recognition efficiency of joint transform correlation system.

为增强联合功率谱的高频成分，改善其调制程度，可对功率谱进行对数变换，从而有效保留更多的高频成份，压低零级衍射光斑，提高联合变换相关器的识别能力。

The line noise is a primary low frequency component of self-noise in submarines.

线谱噪声主要集中在自噪声的低频段。

In order to control the frequency component in the surge, the low-pass filter was used widely.

对于浪涌中的高频分量的控制, 广泛应用的是低通滤波器.

Experimental study of low frequency component of intracranial pressure fluctuation during intracranial hypertension

颅高压状态下颅压波动低频成分的实验研究

The results show that recovery voltage of temporary fault contains the components of power frequency component and free component, while the recovery voltage of permanent fault only contains power frequency component.

研究表明单相瞬时性故障时的恢复电压由自由分量与工频分量叠加而成，而永久性故障时的恢复电压中只包含工频分量。

Finally, the seismic imped-ance inversion is performed with the constraint of different-scale frequency component to achieve the low-frequency impedance sec-tion, the middle/ high-frequeney impedance section, and the overall frequency impedance section synthesized by the former two sec-tions.

然后分别利用井的不同尺度的频率分量作为约束条件，进行了地震波阻抗反演，获得了低频波阻抗剖面、中高频波阻抗剖面以及由低频和中高频波阻抗剖面合成的全频波阻抗剖面。

A Study on Transient Reactive Power Frequency Component of Non-sinusoidal Current Circuit

非正弦周期电流电路瞬时无功功率频率分量研究

However, these methods can't suppress the frequency component in the surge.

但是这种方法难以抑制涌流中的高频分量.

Wavelet Extraction of Impact Vibration Frequency Component and Fault Analysis for a Twine Spool Aero-Engine

某双转子发动机冲击振动的分频小波提取与故障分析

Detection of Initial Phase of Fundamental Frequency Component of a Periodic Signal Mixed with Stationary Noise

平稳噪声背景下周期信号基频初相位检测