Abstract：A flow pattern recognition method based on Choi-Williams analysis and neural network is proposed. The array conductivity sensor is used to obtain the flow pattern information of gas-liquid two-phase flow in vertical rising pipeline, and the multivariate measurement data are denoised and dimensionally reduced. Further, Choi-Williams analysis is used to convert it into time-frequency spectrogram, and the data set is constructed. CNN, VGG-16 and ResNet-18 network models are built respectively, and the time-frequency spectrograms of different flow patterns are used as network input for training and testing. The recognition results show that Choi-Williams analysis can effectively extract the characteristics of different flow pattern signals, and the three networks have high recognition accuracy, among which ResNet-18 network has the highest accuracy, with an average flow pattern recognition rate of 99.4%.
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2023, Vol. 44 
