ultra low frequency meaning in English

超低频
特低频

Research and realizing of ultra low frequency geomagnetic signal proceeding system
超低频地磁信号谱分析系统研究与实现
The ped system is an ultra low frequency “ through the earth ” paging control and remote blasting system
Ped井下无线通讯与急救系统是世界上唯一一套可实现超低频信号穿透岩层进行传输的无线急救通讯系统。
Against the status of large scale ultra low frequency air spring vibration isolation platform , which is low damping and poor performance of low frequency , and after analyzing the existing key damping system , a new type differential electromagnetic damping system ( emds ) is developed in this article in order to reduce the resonance peak of the platform effectively and improve the low frequency performance of the platform
本文针对大型超低频空气弹簧隔振平台阻尼小、低频隔振性能较差的现状,在比较多种提供阻尼力的方法后,提出了用电磁力作为隔振平台的阻尼力,并开发研制了差动式电磁阻尼器系统。该系统可以有效降低隔振平台的谐振峰值,从而达到了提高隔振平台低频性能的目的。