小波变换辨识流型的一种新方法研究

本文提出了一种基于小波分析进行水平管气液两相流流型辨识的新方法。该方法以测试管段的管程压降△P的波动作为测量信号，通过对其小波变换结果的分析，根据不同流型能量分布的定量指标确定了流型判别规则。实验结果表明，这种判别方法能有效地实现对水平管层状流、波状流、塞状流、弹状流等四种典型流型的在线辨识。

Flow Regimes Identification in Horizontal Pipe Using Wavelet Transform

A novel method for the on-line identiflcation of flow regimes of gas - liquid two-phase flow system based on the wavelet transform is presented. The pipeline pressure drop is adopted for signal processing and the Harr wavelet is selected as the mother wavelet. Based on the wavelet coefficients,different time -frequency characteristics in four flow regimes are analyzed,and a criterion of identifying the flow regimes is prop0sed. The experimental results show that it is feasible for the flow regimes identiflcation of stratified,wavy,plug and slug flow in horizontal pipe- Thanks to the Mallat's pyramldal algorlthm,th1s method makes it possible for the on-line identification.