first harmonic
英 [fɜːst hɑːˈmɒnɪk]
美 [fɜːrst hɑːrˈmɑːnɪk]
一次谐波；基（谐）波
英英释义
noun
- the lowest tone of a harmonic series
双语例句
- In this paper, firstly, relations of first two harmonic induced velocities to the lower and same-order harmonic circulations are obtained from the generalized classical vortex theory of the rotor.
本文从旋翼的广义经典涡流理论出发，通过环量对诱导速度的贡献的简化处理，推导出旋翼诱导速度的二阶分布。 - The Duffing Eguation with large damping solved by using first harmonic balance method
基波平衡法求解大阻尼Duffing方程 - Coefficient of determination of average CR and the first harmonic CR in baseline and hyperemia conditions were greater than 0.97 ( P< 0.001).
基础状态和充血状态的平均冠脉阻抗和一次谐波冠脉阻抗的决定系数（r2）均大于0.97（P<0.001）。 - 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.
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。 - Because "DGB-2 Type Fast Track Dynamic Power Factor Compensation Device" has detecting circuit of reaching zero, the paper first analysis the harmonic detecting of starting to sample at reaching zero time and realize the upper harmonic detecting.
因为DGB&2型快速跟踪动态功率因数补偿装置具有过零检测电路。论文首先对过零时刻开始采样的谐波检测进行分析，实现了过零时刻开始采样的谐波检测。 - Secondly, the principles of the LLC half-bridge resonant converter are presented and the performance of LLC resonant converter is analyzed using FHA ( First Harmonic Approximation) method in detail.
其次介绍了LLC半桥谐振变换器的工作原理，并采用基波分析的方法对电路的特性进行详细分析。 - Fast Measuring First Harmonic Reactive Power in Power System Based on 8098 Single Chip Processor
基于8098单片机的电网基波无功功率快速测量 - Through the method of curve fitting, the eccentric motion which is of the same frequency as the rotary speed is separated ( effectively) from the signals in the first harmonic component. Thus the rotational error of the spindle is determined correctly.
应用数学方法曲线拟合法对测量信号中与转速同频的偏心运动和主轴误差运动中的一次误差运动进行了有效的识别分离，正确消除了偏心运动，实现了主轴误差的准确评定。 - If the frequency of a laser is modulated sinusoidally, the first harmonic component of saturated absorption signal can be used as error signal to stabilize the frequency of the laser.
对激光器进行频率调制，检测原子分子饱和吸收信号中的一次谐波成分得到频率误差信号，反馈控制可以实现激光频率的稳定。 - More convenient using of fast Fourier transform to get the first harmonic of the mathematical model, and the error is relatively large.
利用快速傅立叶变换比较方便得到一次谐波的数学模型，而且误差比较大。