Based on non-contact vibration measuring technique of blade tip-timing, "5 + 2" scheme of doublesam-pling rates is adoped to solve the under-sampling problem of asynchronous blade vibration, and by using frequency identification , blade s real vibration can be picked up.
基于非接触式叶尖定时测振原理,针对叶片异步振动的欠采样问题,采用"5+2"双采样速率方案进行采样,通过频率辨识技术来获得叶片的真实振动。
as well as the monitoring data comparison from the two kinds of online monitoring devices installed inside the generators,the effectiveness of the two moniforing methods,the radio frequency online monitoring method and the partial discharge online monitoring method,was comprehensively evaluated.
介绍目前应用广泛的两种发电机定子绝缘在线监测手段,结合国华台电3~4号发电机故障的分析以及对安装在发电机内部的两种在线监测装置的监测数据的比较,对无线电频率在线监测和局放在线监测两种手段的有效性进行了综合评价。
Then some key problems of using radio frequency existing in our country are analyzed.
本文简要介绍了美国、欧盟和我国的频率规划现状,分析了目前我国在无线电频率使用的过程中存在的主要问题,并提出了一些相关建议。
The purpose of this study was to evaluate the effect of collagenase ointment on the epithelial healing of an abrasive wound induced by a radiofrequency system.
目的:无线电频率是用于治疗皮肤皱褶和病损的一种方法,但是它又可以导致表皮的侵蚀性损伤,本研究的目的是观察胶原酶膏剂在这种皮肤损伤后的修复中的作用。
radio frequency emission testing
无线电频率放射测试
international distress radio frequency
国际呼救无线电频率
a radio-frequency amplifier.
一种无线电频率放大器。
public safety radio frequency
公共安全无线电频率
distress frequency
无线电频率遇险呼救频率
very high frequency(abbr. VHF) radio frequency of 30 to 300 megahertz
甚高频（30到300兆赫的无线电频率）.
or 1420 megacycles per second.
即秒1420兆周的精确无线电频率。
picks up electromagnetic radiations in the radio-frequency range from extra-terrestrial sources.
从外陆来源的无线电频率范围内接受电磁射线。
The medium used for the transmission of radio and television signals.Often used in the plural.
波段，无线电频率传送无线电和电视信号的媒介。常用复数
combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two.
把一种无线电频率和当地不同的另一种频率混合的一起。
To provide frequencies for the Olympic Games, we will strengthen the overall planning and management of radio frequencies.
加强无线电频率的统筹规划，为奥运会做好频率准备；
The inappropriate frequency configuration in subway often generates the problem of radio frequency interference.
提出了地铁中由于频率配置不当产生无线电频率干扰问题。
frequency tolerance of radio transmitter
无线电发射机频率容限
marine frequency
海上无线电通信频率
An electronic device that converts one frequency of a radio signal to another.
变频器将无线电讯号从一种频率转换成另一种频率的电子装置
He tuned his radio to the police frequency.
他把无线电调到警方的频率。
This radio signal has a frequency of200,000 cycles per second.
这个无线电信号的频率是每秒200,000周期。
ultra-high-frequency radio system
特高频率无线电通信系统
