水涡 meaning in English
eddies of water
Examples
- The water snails were rude to him , and he was afraid of the ducks
水涡粗鲁地对他而且他很怕鸭子。 - Methods for model tests of hydraulic turbine and reversible pump - turbine
水轮机及双向泵水涡轮的模型试验方法 - Development of mathematical model of heat exchanger outside of air sour ce heat pump heating chilling unit
喷水涡旋空气压缩机压缩过程的换热特性分析 - A deep , round hole worn in rock by loose stones whirling in strong rapids or waterfalls
锅穴，壶穴岩石上深深的圆洞，由于急流或瀑布的水涡带动疏松的石块旋转而成 - In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal , wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station , in which the signal is decomposed into different frequency band , and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source
摘要基于李家峡水电站双排机组振动的现场试验研究，并且针对传统频谱分析方法傅立叶变换( fft )对于非平稳信号已力不从心这一缺陷，利用小波分析方法在时域和频域上同时具有良好的局部化性质，通过对开停机这一典型非平稳过程信号进行小波及小波包分析，将其分解到不同频带内，获取微弱信息和提取优势频率，并对其作振源分析，得出开停机初始时刻因水流不稳均出现强烈的振动现象，且低频段信号能量最大，开停机过程水流脉动压力和尾水涡带摆动是引起定子基础振动的主要原因。