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低频脉动
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  low frequency fluctuation
     In this paper, the integrated parameter method used for the analysis of the dynamiccharacteristics of low frequency fluctuation gas-liquid two-phase flow in horizontal pipeline was presented. The equivalent networks were given in homogenous flow model and separated flow model, respectively.
     研究了在低频脉动情况下应用均相模型法和分相模型法对水平直管段气液两相流动进行集中参数分析的方法。
短句来源
  low frequency pulsatile
     The stress-optic relations in the steady flow and in the oscillatory shear flow are compared,and their differences are analysed. Then, an assumption of a simplified stress-optic relation in a pulsatile flow is suggeSted and experimental proof that this assumption is suitable for loW frequency pulsatile flow is given.
     首先,分析了稳态流动和振荡剪切流中光──力学关系的差异,提出脉动流中简化的光──力学关系假设,然后给出其适用于低频脉动流动的实验验证。
短句来源
     This paper presents the analysis of the low frequency pulsatile flow field of two dimention aorta valve model by adopting the linear stress-optic relations in a steady flow field. The model was emerged in 1.5% Milling Yellow solution in the experiment.
     本文选用1.5%的MillingYellow溶液,在对二维心瓣低频脉动流场的分析中,仍采用稳态流场的线性光-力学关系。
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  “低频脉动”译为未确定词的双语例句
     The equipment can provide low frequency even pulsatile electromagnetic field in the space with the supply of 220V and 40W power,which offering combined therapy of heat and magnitic.
     本装置采用220V 电压,40W 功率,能产生10000~15000V 的低频脉动空间匀强电磁场,将热疗、磁疗融为一体,病人接受电磁沐浴时,不用脱衣,坐在装有输出电极的沙发上,使可使全身穴位受到治疗。
短句来源
     Flame characteristics during low frequency fuel flow-rate oscillations
     燃气流量低频脉动下的火焰结构特征
短句来源
     The early fault signal is very faint, low frequency appears more to pulse , easy to be interfered by the ambient noise even submerged.
     早期故障信号非常微弱,多呈现低频脉动,容易受到噪声干扰甚至被环境噪声所淹没。
短句来源
     The results of the chart of frequency analysis indicated that the frequency structure of fluctuating pressure intensity was similar and the fluctuating pressure intensity was low-lying frequency.
     脉动压强频谱分析的结果表明,各测点脉动压强的频率结构基本相似,均属于低频脉动
短句来源
     The anomalous signal of shallow earthquake is stronger, and appears pulse form; For deep earthquake the signal is weak relatively, and appears low-frequency pulsation.
     震源浅的地震异常信号强,累计持续时间长,其信号呈脉冲形式,震源深信号相对较弱,并显示低频脉动特征;
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  相似匹配句对
     Flame characteristics during low frequency fuel flow-rate oscillations
     燃气流量低频脉动下的火焰结构特征
短句来源
     The distributions of the values of fluctuating pressure conform to the law of normal distribution; and the dominant frequency is low frequency.
     脉动压强幅值分布符合正态分布规律,优势频率为低频
短句来源
     Chaotic Pulsation in Variable Stars
     变星的混沌脉动
短句来源
     Analyzing on Motion of Low-frequency Vibration Sieve
     低频振动筛的运动分析
短句来源
     Analysis of the low frequency components of the intracranial pressure
     颅内压低频分析
短句来源
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  low frequency fluctuation
It was found that grid turbulence reduced turbulence intensities in the shear layer and suppressed low frequency fluctuation.
      
It was found that grid turbulence reduced low frequency fluctuation of the flame fronts, increased the small-scale wrinkles and elevated the mean temperature of the flame zone.
      
Spectral analysis on low frequency fluctuation in respiratory rhythm in the decerebrate cat
      
Synchronization of chaotic outputs from mutually injected lasers is observed not only in low frequency fluctuation regimes but also in high frequency fluctuation regions on the nano-second time scale.
      
These results suggest that low frequency fluctuation of currents depends on the extracellular Ca2+ and underlies the large noise of the 48/ 80-induced inward currents.
      


By the finite difference method, the effect of pulsation on heat transfer tolaminar flow of pseudoplastic power law fluids in pipes has been studied. Basedon this work, heat flow can be increased by imposing pulsation on the flow, Themore the constant n deviates from 1, the more the heat transfer can be improved.The influence of pulsation for low frequency is greater than that for high freq-uency, For smaller n higher amplitudes can give larger improvements; however,as n becomes larger, high amplitudes increase...

By the finite difference method, the effect of pulsation on heat transfer tolaminar flow of pseudoplastic power law fluids in pipes has been studied. Basedon this work, heat flow can be increased by imposing pulsation on the flow, Themore the constant n deviates from 1, the more the heat transfer can be improved.The influence of pulsation for low frequency is greater than that for high freq-uency, For smaller n higher amplitudes can give larger improvements; however,as n becomes larger, high amplitudes increase the heat flux only by a smallamount, or the heat flux can even be decreasecd slightly.

本文用有限差分法研究了脉动对管内幂律流体层流运动时传热的影响。所得结果表明:脉动可使热流率增加,幂律指数n偏离1愈大,对传热的影响也愈显著;低频脉动对传热的影响比高频时大;n较小时,较高振幅能给出较大的改善,但大n时,振幅影响甚微。

In accordance with analysis of actual cases, it has been recognized that damages to aprons on rock foundation were chiefly due to vibrations brought about by the pulsating flow of low frequency, destroying at first the bond between the apron and the foundation and subsequently fracturing the apron itself, then leading to further damage through the actions of the pulsatory force.

本文根据工程实例分析,阐明在岩基上护坦破坏的主要原因是低频脉动水流产生的振动,它首先使护坦与岩基粘结破坏,然后引起护坦自身断裂,最后在脉动力矩等作用下将护坦毁坏。根据脉动压力性质和护坦结构特征,本文对护坦的动力反应、振动内力及倾覆稳定提出计算方法,为设计应用。

The turbulence structure, velocity distribution, and spectral density distribution of water flow and Bingham mud flow are studied as the flows carry bed load particles. Experiments prove that average velocity decreases and average velocity gradient increases as the flows carry bed load. Turbulent intensity of flow carrying bed load is much larger than that without bed load. Bingham mud flow could become turbulent in the lower part of the flow while the upper part remains laminar as Reynolds number Rcm is between...

The turbulence structure, velocity distribution, and spectral density distribution of water flow and Bingham mud flow are studied as the flows carry bed load particles. Experiments prove that average velocity decreases and average velocity gradient increases as the flows carry bed load. Turbulent intensity of flow carrying bed load is much larger than that without bed load. Bingham mud flow could become turbulent in the lower part of the flow while the upper part remains laminar as Reynolds number Rcm is between 2000 and 8000. The laminar flow in the upper part is transformed into turbulent flow as bed load particles are put into the flow.These phenomena could be interpreted by understanding the fact that bed load motion increases the Reynolds stress and average velocity gradient, therefore, the energy transmitted from time-averaged motion into turbulence is largely enhanced. The probability density distribution of fluctuating velocity of water flow carrying bed load deviates far from normal distribution. Bed load motion in Binghafn mud flow reduces the autocorrelation coefficient of the turbulent flow. Turbulent energy in Bingham mud flow concentrates in low-frequency (0-1 Hz) turbulent eddies. After adding coarse sand into the mud flow which moves as bed load, the turbulent energy in low-frequency decreases and that in high-frequency turbulence increases, because bed load motion transports energy from low-frequency turbulence to high-frequency turbulence.

通过试验研究了清水湍流和泥浆湍流中加入推移质后时均流速分布、脉动强度、概率密度分布、相关系数、频谱密度分布等的变化.试验结果证明,清水和泥浆湍流中加入推移质后时均流速减小,时均流速梯度增大,脉动加强.泥浆过渡区湍流上部为层流,有流核,加入推移质后,上部层流转变为湍流,流核消失.分析证明,这是由于推移质运动增大了雷诺应力和时均流速梯度,因而增大了时均流动向脉动传递的能量的缘故,清水湍流中加入推移质后脉速概率密度分布偏离正态,偏态系数加大.泥浆湍流中加入推移质后相关系数降低,脉动的随机性增大.泥浆湍流的脉动能量集中于低频脉动.由于推移质也可以吸收低频脉动能来支持其运动,所以加入推移质后泥浆湍流的低频脉动能量降低,高频脉动能量增大.

 
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