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《Nuclear Power Engineering》 2007-06
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Identification Method for Gas-Liquid Two-Phase Flow Regime Based on Singular Value Decomposition and Least Square Support Vector Machine

SUN Bin, ZHOU Yun-long, ZHAO Peng, GUAN Yue-bo (School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin, 132012, China)  
Aiming at the non-stationary characteristics of differential pressure fluctuation signals of gas-liquid two-phase flow, and the slow convergence of learning and liability of dropping into local minima for BP neural networks, flow regime identification method based on Singular Value Decomposition (SVD) and Least Square Support Vector Machine (LS-SVM) is presented. First of all, the Empirical Mode Decomposition (EMD) method is used to decompose the differential pressure fluctuation signals of gas-liquid two-phase flow into a number of stationary Intrinsic Mode Functions (IMFs) components from which the initial feature vector matrix is formed. By applying the singular value decomposition technique to the initial feature vector matrixes, the singular values are obtained. Finally, the singular values serve as the flow regime characteristic vector to be LS-SVM classifier and flow regimes are identified by the output of the classifier. The identification result of four typical flow regimes of air-water two-phase flow in horizontal pipe has shown that this method achieves a higher identification rate.
【CateGory Index】: O359.1
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