基波频率

具体分述如下：①先对采样信号用BP神经网络进行分析，得到高精度的基波频率。

Described specifically as follows : ① Using the BP neural network to analysis the sampled signals , obtain the high-precision of fundamental frequency .

以椭圆板域求解为示例，分析了偏心率e和面积对基波频率系数的影响。

Finally , an ellipse elastic clamped-plate is used as an example to analyze the effects on fundamental frequency coefficient caused by eccentric ratio e and area size .

用微机查表方式调整SPWM波的基波频率和幅度，操作简单省时。

The adjustment of frequency and amplitude of the SPWM waves is accomplished on microcomputer . The operation is simplified and needs less time .

采用BP神经网络分析基波频率的原理和方法来高精度检测整数次谐波中的基波频率，再利用传统的线性神经网络方法分析整数次谐波。

Using the principles and methods of analysis fundamental frequency with BP neural network to detect fundamental frequency in integer harmonics high accuracy , then achieve the integer harmonics detection with the traditional linear neural network .

需要补偿N′次以下的谐波电流时，重采样频率应不小于（N′+1+n）ω0（ω0为基波频率）。

When the active power filter ( APF ) is designed to compensate N ′ th harmonic currents , the resampling frequency should not be less than ( N ′ + 1 + n )ω 0 , ( where ω 0 is the fundamental frequency ) .

传统的FFT算法只能分解出整数次谐波，而微网中间谐波的存在及基波频率变动，使得传统的FFT算法很难实现同步采样，从而导致频谱泄漏和栅栏效应。

Traditional FFT algorithm only can decompose integer harmonics . Because the presence of inter-harmonics and the changes of fundamental frequency , traditional FFT algorithm is difficult to achieve simultaneous sampling which will lead to spectral leakage and fence effect .

仿真结果表明：采用小波变换能将故障频率成功的提取出来，消除了泄露的基波频率分量对故障频率的淹没影响，而直接的FFT变换则不能检测出转子断条故障频率分量。

The simulation results show that , wavelet transform has successfully extracted the fault frequency , and it can eliminates influences of the fundamental frequency components covering the fault frequency . But the method that uses the FFT can not detect broken rotor bar fault frequencies .

在畸变的50Hz波形中存在非基频的分量。这些频率是50Hz基波频率的整数倍。

These are the non-fundamental frequency components of a distorted 50 Hz waveform . They have frequencies which are integral multiples of the 50 Hz fundamental frequency .

测试信号电平范围为±5V，基波频率上限100kHz，精度可达失真度的2.5%。

The level range of input signal is ± 5 volts . The highest frequency of basic wave is less than 100 kHz . The accuracy of system approaches 2.5 % .

采用加窗方式有效提高了计算精度，较之于递推DFT的测频方法，加窗以后能较好的排除频谱泄漏、谐波等给测量带来的干扰，能精确测量电力系统的基波频率。

The computational accuracy is improved by using the windowed mode . Comparing to the recursive DFT frequency measurement method , the added windowed can exclude the interference brought by the spectral leakage and harmonic waves and measure the fundamental frequency of the electric power system .

电力系统基波频率的高精度测量新方法

A New High-accuracy Method on Fundamental Frequency Measurement for Power System

基于简支弹性矩形板含集中质量振动基波频率共形映射解析

Conformal mapping analysis of fundamental vibration frequency of simple-supported elastic RECTANGLE-PLATES with concentrated mass

结果与结论差频信号的基波频率与目标距离相对应；

Results and Conclusion The fundamental frequency of the beat signal is relative to the target distance .

分（频）谐波的：频率为基波频率整约数的一种周期性波的，与这种波有关的，是这种波的。

Of , relating to , or being a wave with a frequency that is a fraction of a fundamental frequency .

仿真研究表明，所建立的方法具有响应速度快、检测精度高、自适应能力强等优点，并且不受电压畸变和基波频率漂移的影响。

Besides the virtues of rapid response , high precision and outstanding self-adaptive ability , the approach is not affected by voltage distortion and frequency excursion .

得到了一些在频率谱图中无法观察到的规律：存在一些与基波频率有着一定关系的线谱。

Got some rules can not be observed in the frequency spectrum : there are some line spectrums that have a certain relationship with the fundamental frequency .

这种方法与传统的快速傅立叶变换算法相比，避免了由于基波频率提取不准而造成的频谱泄漏，在一定的基波频率变化范围内具有较高的精度。

With this method , the spectrum leakage can be avoided more effectively than Fast Fourier Transform algorithm and better accuracy can be assured in certain frequency range .

高阶正弦拟合法以信号的基波频率、谐波幅值和相角作为变量对信号进行拟合，该法能有效减轻谐波存在和频率波动的影响，精确测量电气设备的介损角。

The higher-order sine fitting algorithm takes fundamental harmonic frequency , harmonic amplitude and initial phase angle as variables to fit signal , so that the influence of harmonic and frequency fluctuation can be alleviated .

重复控制器由于内模中包含描述跟踪误差信号的数学模型，在误差信号的基波频率及其整数倍频率处能够完全消除系统的稳态误差，并在内模中引入低通滤波器以保证系统的稳定性。

The internal mold of repetitive controller includes mathematic model describing the error signal , thus the steady state error of system can be eliminated completely at the fundamental frequency and its integral multiple frequency of the error signal .

提出了一种新的基于三角基函数神经网络的电力系统谐波测量方法，给出了该神经网络算法的收敛定理，并采用加窗插值算法修正基波频率的准确度。

A new harmonic analysis method for electric power systems based on triangle basis functions neural network was presented , the convergence theorem of the algorithm was proposed , and a window function and interpolation algorithm were employed to correct the frequency of fundamental waves .

该信号经处理电路后，可获得一个频率与激励信号源的基波频率相等的电信号，检测这两个信号间的相位差的变化，可得到标尺光栅的移动距离x。

Another electrical signal is obtained after processed by circuit , whose frequency is same as the fundamental frequency of actuating signal source , the movement distance x of scale grating can be obtained by detecting the change of phase difference between two electrical signals .

在稳态运行时，根据基波频率、载波频率和负载电流来改变电感值，以便获得较好的滤波效果和电气传动效果。

When the motor works in its steady state , the inductance of the output filter can be adjusted according to the inverter fundamental frequency , carrier frequency , and load current . A better filtering effect and better electrical driving effect can thus be achieved .

对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。中性点无冲击短时投切低阻的中压电网单相接地故障选线装置的研究

The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies . The Study of Single-phase-to-earth Fault Line Selection Device Based on Shortly Turning on and off Low Resistor Method Without Impulsion in Ungrounded Neutral System

文中详细介绍了神经网络的分析原理及算法的实现过程。针对采样频率与实际基波频率异步的情况，提出一种基于神经网络模拟退火的谐波分析算法。

This paper describes the analysis of neural network theory and algorithm implementation process . A neural network method based on simulated annealing is proposed for harmonic analysis algorithm , this method is aimed at the system in which the sampling frequency cannot be locked on the actual fundamental frequency .

这种脉动转矩的频率为基波电流频率的六倍。

Frequency of this pulsating torque is six times as high as that of the fundamental current .

该方法通过对采样信号进行神经网络训练，可获得高精度的电力系统基波的频率、幅值及相位。

By training the sampling signals using neural network method , access to high-precision power system fundamental frequency , amplitude and phase .

讨论了群速度失配、自相位调制和交叉相位调制、晶体厚度、基波的频率啁啾等因素对超短脉冲单块晶体的三次谐波转换效率、三倍频光脉冲形状以及频谱的影响。

The effects of group-velocity mismatch , self-and cross-phase modulation , the thickness of crystal , and the chirp of fundamental field on the conversion efficiency , pulse shape and spectrum of third-harmonic field were discussed .

讨论了基波为频率啁啾脉冲的光学参量混频，结果表明选取合适的啁啾参数可以有效地降低三波在非线性晶体的空间走离效应，提高增益。

The effect on the gain of a chirped pulse in the process of optical parameter generation are discussed , the results show that the walk-off effect can be reduced and the gain of the signal pulse can be increased if an appropriate chirped parameter is selected .

解决IIR小波滤波器的实现的问题，将其应用于含有噪声的涡街传感器信号的基波提取和频率测量。

The problem of implementation of IIR wavelet filter banks is solved , and IIR wavelet filter banks are applied to the vortex signal with noise to extract the fundamental wave and measure its frequency .

应用数字信号处理器的基波相位和频率校正检测方法

Fundamental Frequency and Phase Correcting Detection Method Applying Digital Signal Processor