1) Hz frequencey
20Hz频率
2) 20 Hz electric source signal
20Hz电源
1.
To make up the defect of 100% stator grounding protection function, the protection scheme based on injecting 20 Hz electric source signal is proposed.
为了弥补定子接地100%保护的不足,引入了20Hz电源注入式保护方案。
3) 20Hz voltage injection
20Hz注入式
1.
The stator grounding fault protection with 20Hz voltage injection can provide 100% winding s protection and monitor the drop of stator s insulation.
20Hz注入式定子接地保护可以单独实现定子100%绕组的保护,可以监测定子绝缘水平的下降,因而越来越多地应用于大型发电机保护。
4) frequency
[英]['fri:kwənsi] [美]['frikwənsɪ]
频率
1.
Quantitative analysis of relationship between transitory internal friction and frequency during reverse martensitic transformation in Ni_(49.8)Ti_(50.2) alloy;
Ni_(49.8)Ti_(50.2)合金马氏体逆相变的瞬态内耗与频率间关系的定量分析
2.
Influencing analysis of human activities on frequency of red tides(HABs) in Zhejiang Sea Areas;
人类活动对浙江近海赤潮发生频率的影响分析
3.
The Gradient Analysis with Frequency Variation in Optical-electrical Characteristic of Liquid Crystal Light Valve;
液晶光阀特殊光电特性中的陡度随频率变化的分析
5) frequencies
[英]['fri:kwənsi] [美]['frikwənsɪ]
频率
1.
A separable approach based on the SVD of a data matrix is proposed to estimate frequencies and bearings of noise sources by a uniform linear array.
本文提出利用均匀线阵接收的数据构造一种矩阵进行奇异值分解，以对频率、方位两参数进行分离估计，用频率谱估计出声源频率，用方位谱估计出声源方位角。
2.
By using CAD software, the influence of mass and spring constant on system natural frequencies and mode shapes is discussed respectively.
本文首先导出了该系统频率和振型的分析表达式,并利用计算机辅助设计软件,分别讨论了质块质量及弹簧常数对系统频率的影响。
6) natural frequency
频率
1.
The first natural frequency map in working space was drawn,which can be useful for selecting proper working position to avoid resonance or low-order harmonic oscillation.
为了描述柔性并联机器人的弹性动力学性能,分析了机器人振动频率的特征。
补充资料：频率计量(见时间频率计量)
频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology
口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条