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用Wigner谱首次对气固流化床压力脉动信号进行时频二维分析,压力脉动信号的强非平稳性得到了证实.在Wigner谱平面中定义了局部频峰加权平均频率参数,从实验角度研究了流化床气速、静床高对压力脉动信号加权平均频率的影响.结果表明,它具有比传统的功率谱主频好得多的统计重复性,能更准确地反映气泡相的特性.
The time-frequency two-dimensional analysis of pressure-pulsation signals of gas-solid fluidized bed was firstly carried out by Wigner spectroscopy, and the strong nonstationarity of pressure-pulsation signals was confirmed.Weighted local frequency-weighted average frequency parameters were defined in the Wigner spectrum plane, The effects of fluidized bed velocity and static bed height on the weighted average frequency of pressure pulsation signals were studied.The results show that it has a much better statistical repeatability than the traditional power spectrum frequency and can reflect the bubble phase characteristics more accurately .