气液两相间歇流压差波动信号的Wigner谱分析

Differential Pressure Fluctuation Analysis of Gas-liquid Two-phase Intermittent Flow Using The Wigner Distribution

应用Wigner谱对水平管内气液两相间歇流压差波动信号进行时频二维分析,证实了压差波动信号的强非平稳性,与传统的功率谱分析不同的是,得到了在同一时刻可以只出现一个较强的局部频率峰值,也可以出现一个以上的多个局部频率峰值。研究还发现,宏观相似的压差波动信号,通过Wigner谱分析可以清楚地从频域上揭示其微观存在的差异。

The strong non-stationary feature of differential pressure fluctuation signals of the gas-liquid two-phase intermittent flow in the horizontal pipe is demonstrated by using the time-frequency two-dimensional analysis of Wigner distrbution(WD).Compared with the analysis of the traditional power-spectral density,the WD analysis shows there is not only a major local frequency peak but also more than one major local frequency peaks at the same time.The study also indicates the macrocosmic similar signals of the differential pressure fluctuation exist microcosmic difference in frequency area by the WD analysis.