水流脉动 meaning in Chinese
flow fluctuation
Examples
- The definition and calculation of fractional dimension is introduced briefly . the pressure fluctuation signals are processed by reconstructing the phase space for sediment - laden and aerated flow . the correlation dimensions are calculated for sediment - laden flow , clear water and aerated flow
简要地介绍了分维的定义和计算，运用相空间重构法对含沙掺气水流脉动压强信号进行处理，计算了浑水、清水、掺气三种不同水流状况的关联维数。 - 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。 - The fundamental theory and equations for the pressure fluctuation are described and the wall pressure fluctuation is measured . based on the experiment data , the characteristics of pressure fluctuations are analyzed in the three - phase flow of water , air and sand . the effects of air concentration and sediment content on the amplitude and frequency of pressure fluctuations are discussed
建立了多相流压强脉动基本方程，阐述了水流脉动压强基本理论，分析了压强脉动机理；根据试验数据，探讨了水、气、沙三相流体的压强脉动特性，初步得到了高速含沙掺气水流脉动压强的幅值特性与频域特性；提出了脉动压强强度系数、脉动压强极差系数与含沙量、掺气浓度的关系。