Using Fourier series, the frequency spectrum analysis was analyzed, and spectrum data of harmony wave less than 19 were calculated.
利用傅里叶级数对其进行了频谱分析，计算了次数小于19次的各次谐波电流均方根值的频谱数据。
In this paper, the finite double Fourier transforms were applied to solve the nonhomogeneous boundary value problems of the wave, heat conduction, Laplace and Poisson equations.
本文用有限的二重傅里叶变换解波动方程，热传导方程，拉普拉斯方程以及泊松方程的非齐次边值问题。
We also use short time Fourier transforms to analyze the spectrum of the scattered wave during the propagation process, and obtain some useful results.
并用短时傅立叶变换分析了声波传播过程中晶粒散射波的频谱特性。获得了一些有用结果。
The pseudo-spectrum method uses Fourier transform and finite difference to solve wave equation. It is one of the important methods used to simulate the seismic wave field.
伪谱法利用傅立叶变换和有限差分求解波动方程，是三维波场正演模拟的重要方法之一。
As is well known to everybody, the Fourier transformation is a validly mathematical tool in the research of wave theory and the revelation of its essence.
众所周知，傅氏变换是研究物理波动现象、揭露其本质的一种有力的数学工具。
The Fourier analysis method is applied to decompose the air-gap magnetic density into the basic wave and a series of harmonic and wave shape eigen coefficient of air-gap magnetic field are calculated.
采用付立叶谐波分析的方法把气隙磁密分解为空间基波和一系列谐波，进而计算出气隙磁场波形特征系数。
The Fourier spectrum of the wave moment shows that high frequency components will appear and they may cause ringing.
分析结果表明，极端波浪作用下的波浪力矩包含高频成分，是结构物可能产生高频共振响应的原因。
The primary function of the auxiliary signal generator is output sine wave or SWIFT (stored wave form inverse Fourier transform) wave at the scheduled time.
辅助信号发生器的主要功能是在规定的时间段内输出正弦波或者任意波形。
For example, a deep understanding of Fourier analysis or wavelet can give much different understanding of wave motion or technique of imaging.
举例而言，对付立叶分析的理解越深入，我们就更能理解波的运动及图像的技巧。
The Green's functions for electric and magnetic vector potentials in a sectoral wave guide and its cavity are derivated by using the separation of variables, Fourier transform and residue theory.
文中介绍了扇面直波导及其腔体中电矢量位和磁矢量位的格林函数，采用分离变量法、傅里叶变换法和留数定理导出了格林函数的具体表达式。
By using Fourier transformation, the original wave-front can be recovered with higher precision and in more details.
在理想情况下，利用离散傅里叶变换及其性质，能精确恢复原始波面。
Based on the fast Fourier transform (FFT) algorithm, the wave-front reconstruction algorithm of Shack-Hartmann sensor is described.
提出了一种应用快速傅里叶变换算法提高哈特曼夏克波前传感器波前重构实时性的快速算法。
The simulation and the experiment results demonstrated the precision of cross path integration techniques, Fourier transform integration and area wave-front reconstruction method.
通过计算机模拟和波面实际测量，对十字路径积分法、傅里叶变换积分法和区域波前重构法三种主要算法的重建精度进行了对比研究。
The decaying DC component in the sampling signal will bring errors to the full-wave Fourier algorithm, which is derived with periodic signal.
全波傅氏算法是基于周期信号推导出来的，当采样信号中含有衰减直流分量时，将会产生误差。
Mainly, FFT algorithm and full-wave Fourier algorithm are discussed. Calculation of active power and imaginary power is researched. Parameter selection of filtration and calculation of are attained.
主要就快速傅里叶变换算法、全波傅氏算法以及有功功率、无功功率的计算、滤波的参数选取、谐波的计算进行了讨论。
Elastic wave propagation in anisotropic medium is simulated by solving the equation system with the aid 'of Fourier numerical method (pseudo-spectrum method).
本文利用傅里叶数值方法(即伪谱法)求解该方程来模拟各向异性介质中弹性议的传播。
The normalized full gradient and phase of gravity anomalies have been studied by potential field conversion and fast Fourier transform in wave-number domain.
用波数域的位场转换和快速傅立叶变换理论研究重力归一化总梯度和归一化相位；
Fourier finite difference operator can be adopted to ensure good fidelity of seismic wave field in wave field continuation of complicated geology structure, bringing high quality image.
利用傅里叶有限差分算子可保证在复杂构造的波场延拓中，地震波场不失真，成像质量高。此外，本文对傅里叶有限差分算子作了必要的优化。
To shorten the time of calculating the full-wave Fourier algorithms and improve response time, it is necessary to use Fourier recursive algorithm.
为了缩短全波傅立叶算法的计算时间，提高响应速度，有必要采用递推实时算法。
After deeply studied in the fast Fourier transform (FFT) method, this paper presents an improved FFT algorithm considering the half-wave symmetric characteristic of power system signals.
在深入分析快速傅里叶变换(FFT)方法的基础上，针对一类电网信号具有半波对称性的特点，提出了一种改进的FFT算法。
Then, a semi-analytical solution for the velocity response of the pile subjected to a semi-sine wave exciting force was derived by using invert Fourier transform.
利用付立叶逆变换，给出了半正弦脉冲激励下桩顶速度时域响应半解析解。分析了主要参数对响应的影响。
The two-dimensional fast Fourier transform (2D-FFT) method has been used to analyze the ultrasonic signals where different wave modes overlaid in the time domain.
利用二维快速傅立叶变换的时频分析方法，对有限元计算得到的时域信号进行了分离，得到了各个模式超声波的相速度色散曲线。
The two-dimensional fast Fourier transform (2D-FFT) method has been used to analyze the ultrasonic signals where different wave modes overlaid in the time domain.
利用二维快速傅立叶变换的时频分析方法，对有限元计算得到的时域信号进行了分离，得到了各个模式超声波的相速度色散曲线。
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