查询词典 harmonic analysis

In this paper, an equipment of harmonic monitor and analysis based on internet technology is designed.

论文开发研制了基于Internet的电力系统谐波监测与分析系统。

This paper makes a summary of the existing analysis methods of harmonic and interharmonics , and compare their advantages and disadvantages.

为此本文对现有谐波分析算法及其理论基础作了回顾和探讨，指出了各种算法的优点和局限性。

Based on the analysis of harmonic detection technology at home and abroad on the status and development direction of the foundation, Power harmonics of the basic theory and the detection algorithm.

本文在分析了国内外谐波检测技术的现状和发展方向的基础上，研究了电力谐波的基础理论和检测算法。

The research lay a foundation for the harmonic response analysis of electric spind...

同时，也为下一步的谐响应分析奠定了基础。

In this paper, the analysis model of crustal vertical movement is established based on the hypothesis of the global flux isostatic datum, and its harmonic function series solution is proposed.

根据全球通量均衡假说建立了地壳垂直形变场的分析模型，在球面近似下求得了该模型的球谐函数级数解并拟合了两个不同区域的地壳垂直形变场，编绘了等值线图，继而在密切平面坐标系下导出了该模型的Fourier级数解。

For the shortcomings of geometry based initial solution methods for inverse analysis method in sheet stamping, a 3D mesh harmonic mapping algorithm based on energy theory is implemented.

针对目前在板料成形反向模拟法中常用到的初始域计算方法的缺点，提出采用一种基于弹簧系统能量理论的空间网格映射法。

In order to measure jitter of gain-switched laser precisely, we analyze theoretically the math model and measurement principle of harmonic spectrum analysis used to measure laser pulse jitter.

为了能够精确测量增益开关激光脉冲的抖动，应用傅里叶变换和自相关函数，理论分析了谐波频谱分析法测量激光脉冲抖动的数学模型、测量原理，修正了David A。

An unsteady aerodynamic model based on Fourier analysis is developed in the frequency domain with the theory of system identification and the experimental data of large amplitude harmonic oscillation. This unsteady aerodynamic mathematical model is used to extract dynamic derivatives, and the meaning of a time-lag loop is analyzed.

应用系统辨识理论，利用纵向大振幅非定常气动力实验数据，在频率域内建立了基于Fourier变换法的非定常气动力数学模型，并发展了一种获取常规动导数的仿真实验方法，分析了迟滞环的物理意义。

Theoretical analysis and experimental results show that the fundamental suppression ratio is more than 94dB and the harmonic attenuation ratio is no more than 5%.

理论分析和实验表明，电路的基波抑制度可达94dB以上，谐波衰减率不大于5%。

In order to optimize performances of shunt active power filter of harmonic compensation, attenuation ratio for switching ripple, stability and power losses, an improved LCL filter topology was presented based on the analysis of the frequency characteristics of the LCL filter, in which a switching-ripple shunt branch and a series-inductor were adopted to the damping resistor to reduce the power losses dramatically.

为了使并联有源滤波器谐波电流补偿性能、开关纹波衰减率、系统稳定性和功率损耗等方面性能得到系统的折中和优化，提出了一种改进型LCL滤波器拓扑，该结构充分利用了LCL滤波器的频率特性，在阻尼电阻两端引入开关纹波谐振分流支路，同时在阻尼电阻上串联一小电感，有效的减少了阻尼电阻的损耗而不改变系统的静态和动态性能。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。