有的级数(如傅立叶级数)用来解微分方程序特别有用。
Such series (e. g., the Fourier series) are particularly useful in solving differential equations.
对于周期波形，傅立叶级数表示法在整个时间段都是有效的。
For periodic waveforms, the Fourier series representations are valid over all time.
其中，瑞利反射率可以用与角度和波长有关的傅立叶级数近似。
Rayleigh reflectance can be approximated using Fourier series relevant to angles and wavelength.
用周期函数，有限项傅立叶级数，作为激励函数来获取训练样本。
A periodic function, finite Fourier series, is used to activate the actuator for obtaining training samples.
文中提出应用傅立叶级数系数的电流控制算法，能明显减少转矩波动。
In this paper, a current control algorithm using Fourier series coefficients is proposed. This algorithm can minimize torque ripple obviously.
运用傅立叶级数的形式，计算了一对宽斜齿轮副的瞬时啮合刚度及一对啮合轮齿的啮合刚度；
The mesh stiffness of a pair of helical gears is calculated by substituting the variance of the contact line length for the variance of the instantaneous mesh stiffness.
采用分段映射和傅立叶级数的分析方法对并联型可控饱和电抗器的谐波特性进行了详细分析。
This paper proposes an ontology mapping model based on fragment mapping, which decomposes ontology, and then does fragment mapping.
通过对半控双三相12脉冲整流器的电流波形分析和傅立叶级数展开，得出系统的主要谐波成分。
Through analysis of the current waveform of the semi-control double three-phase 12-pulse rectifier and the expansion of Fourier series, the main harmonic components of the system were obtained.
为了深入研究阵列的动力学行为，提出了一种简化的阵列相位连续模型并通过傅立叶级数法求得了解。
To intuitively understand the dynamic behavior of the array, a simplified phase continuum model was proposed and solved via Fourier series.
应用广义阶梯函数来表示载荷，然后再将其展开成傅立叶级数形式，推导出纵向剪切问题的位移计算公式。
The Fourier series of load is given by using generalized step function and the displacement formula of the longitudinal shear problem is derived.
介绍了直接数字频率合成技术以及分析其杂散误差，对相位截断误差和幅度量化误差进行了傅立叶级数分析研究。
The spectrum characteristics of the phase truncation error and amplitude quantization error are analyzed by the method of Fourier series.
在一些电路教材中常把带滤波器的整流电路作为一个实例，用以讲述用傅立叶级数的谐波分析方法来求解非正弦电路。
In some circuit textbooks the rectifier circuit with the filter has been used as an example to illustrate the harmonic analysis of nonsinusoidal circuit adopted Fourier series.
该方法利用闭合曲线的傅立叶级数表示的直流分量和一次分量实现对闭合曲线的椭圆拟合，可以避免通常椭圆拟合方法中的矩阵求逆问题。
The method USES the DC component and the first harmonic of a curve's chain code expressed by Fourier series to fit the curve, avoiding the inverse calculation of an array used in general methods.
用比较直接的方法证明幂级数的和函数在收敛域内可以逐项微分的公式；并得到了计算傅立叶系数的一种简便方法。
A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.
通过对级数解的数值计算发现傅立叶准则和毕渥准则对级数解的收敛速度有显著的影响。
It is found that the Fourier and Blot Numbers have big effect on the convergence speed of series solution.
通过对级数解的数值计算发现傅立叶准则和毕渥准则对级数解的收敛速度有显著的影响。
It is found that the Fourier and Blot Numbers have big effect on the convergence speed of series solution.
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