中文摘要：

针对水平管气液两相流差压波动信号的非高斯特性，提出了一种基于高阶谱技术的差压波动信号分析的新方法．通过对气液两相流差压波动信号的双谱分析，提取了不同流型下信号的非高斯特征．以信号双谱幅值的平均值作为特征值，对不同流型下信号偏离高斯分布的程度进行了定量地分析，并讨论了在不同管径下不同流型的差压波动信号的双谱特性及非高斯特征．实验结果表明，提取的特征值反映了信号偏离高斯分布的程度，据此可以作为气液两相流流型转变的判据．

英文摘要：

A new method based on higher-order spectrum was proposed to analyze the differential pressure fluctuation signal in this study on the non-Gaussian characteristics of the differential pressure fluctuation signal of gas-liquid two-phase flow in horizontal pipeline. The non-Gaussian characteristics of differential pressure fluctuation signal of different flow patterns were extracted by using bispectral method. The average bispectral magnitude of differential pressure fluctuation signal was taken as an eigenvalue for the quan- titative analysis of the deviation degree from normality. Meanwhile, the signal bispectral features and non- Gaussian characteristics of different flow patterns under different pipeline diameters of were discussed. The experimental results show that the extracted eigenvalue reflects the deviation degree from normality and that the transition of flow patterns can be determined from the extracted eigenvalue.