气固流化床中空隙率波动信号的自由度数确定

Determination of the Freedom Degrees of Voidage Fluctuation Signals in Gas-Solid Fluidized Bed

确定气固流化床体系的自由度数是对该系统进行定量描述的前提和基础。本文采用小波分析方法,将气固流化床中空隙率波动信号进行小波变换,以相空间重构和混沌分析理论为基础,通过G-P算法和Liangyuechao提出的方法计算空隙率波动信号小波系数的最小嵌套维,从而确定了气固流化床中空隙率波动信号的自由度数,并对两种确定最小嵌套维的方法进行了比较。

Determination the number of freedom degree of voidage fluctuation signals in gas- solid fluidized bed is the premise and basis for quantificationally describing the gas- solid fluidized system. In this paper, the voidage fluctuation signals in gas- solid fluidized bed were wavelet-transformed by the wavelet analysis, and the number of freedom degree for voidage fluctuation signals were determined by using G-P method and Liangyuechao method to calculate minimal embedding dimension of wavelet coefficient for voidage fluctuation signals according to the phase-space reconstruction and chaos analysis theories. And the two methods for determining minimal embedding dimension were compared.