基于Hilbert-Huang变换的油水两相流流型特征提取

油水两相流的流型影响着流动参数的准确测量以及两相流系统的运行特性。油水两相流属于非线性、非平稳信号,针对此特点,采用Hilbert-Huang变换方法对油水两相流电导波动信号进行分析,实现信号的能量特征提取。首先,将油水两相流电导波动信号进行经验模态分解(empiricalmode decomposition,EMD),求出得到的固有模态函数(intrinsic mode function,IMF)的能量,并对各层能量进行归一化,找出不同频段IMF的能量特征与流型之间存在一定关系。实验证明,Hilbert-Huang变换方法可以很好的表征油水两相流流型特征。

Flow pattern feature extraction of oil-water two-phase flow based on Hilbert-Huang transformation

Oil-water two-phase flow patterns affect the accurate measurement of flow parameters and the two-phase system operating characteristics.Oil-Water two-phase flow is of the nonlinear and non-stationary signal.Aimed at these characteristics,oil-water two-phase flow of conductance fluctuations signals was studied by using of Hilbert-Huang transform method,and feature extraction for signal energy.Firstly,the conductance fluctuations in oil and water two-phase signal EMD decomposition,and then find the resulting intrinsic mode function of energy,and energy normalized levels, to identify characteristics of IMF and the actual flow of energy between the relations.Experiment results show that the HHT method can show characterization of oil-water two-phase flow greatly.