气固流化床压力脉动信号的混沌特征分析

ANALYSIS OF CHAOTIC CHARACTERISTICS FOR PRESSURE FLUCTUATION SIGNALS IN GAS-SOLID FLUIDIZED BEDS

对气固流化床内压力脉动时间序列进行分析，研究了流化床内的混沌特性，分别利用李雅普诺夫指数、相对分散度、分形维数和混沌度来定量描述稳定性、复杂性、自由度和系统状态数。证明四个混沌特征参数的相关性是好的，得到了混沌特性随着气速和床层高度的变化趋势，并且提出气泡行为是流化床内产生混沌运动的重要原因。

Chaotic characteristics of fluidized beds were analyzed using time series of pressure fluctuation in gas-solid fluidized beds by this study. Lyapunov exponent, relative dispersion, fractal dimension and chaos count were adopted to measure the stability, complexity, degree of freedom and state of the system accordingly. It was also tested that these four chaotic parameters have prominent correlativity. The trends of chaotic characteristics changing with the gas velocity and the bed height were deferimend in defeil. It concluded that the bubble behavior is the dominant cause of chaos in the fluidized bed.