Abstract:

Recurrence plots analysis was to the pressure fluctuation signals with chaos and fractal characteristics in the gas-solids recycled fluidized bed. The relationship between characteristic parameters of recurrence plots and the largest Lyapunov exponent was studied and it was concluded that the characteristic parameters of recurrence plots could reflect the extent of chaos. The change of the characteristic parameters in different styles of fluidized bed was investigated. The characteristic parameters increased or decreased swiftly in the styles of bubbling bed and fast fluidized bed, and kept steady in the styles of fixed bed, turbulent bed and pneumatic conveying bed. Recurrence plots could also indicate the style of fluidized bed.

Key words:

递归图, 压力脉动, 混沌, 流化床

摘要：

引入递归图分析方法对具有混沌与分形特性的气-固循环流化床压力脉动信号进行分析，针对Logisitc模型比较了递归图特征量递归率、确定性、平均对角线长度、分叉性与最大Lyapunov指数之间的关系，得出了递归图特征量对于混沌特性具有表征作用的结论。研究了递归图特征量在气-固循环流化床不同床型下的变化规律，递归图特征量在固定床型、湍流床型、气力输送床型下保持稳定，在鼓泡床型、快速流化床型下分别迅速递增或递减，因此递归图特征量同样可以对循环流化床不同床型进行辨识。

关键词:

递归图, 压力脉动, 混沌, 流化床