粗颗粒流化床的混沌特性研究

Study on Chaotic Characteristics of Large-Particles Fluidized Bed

研究了平均粒径为3.5-4.5mm的D类物料颗粒流化床的混沌特性。对流化床压力波动时间序列进行了相空间重构,并计算了重构相空间的关联维数和Lyapunov指数谱,得到描述此类流化床稳定运行的最小的状态变量数目,证明粗颗粒流化床系统属于混沌系统,可以利用混沌理论来研究粗颗粒流化床的压力波动,提取其中隐含的信息,进而考察系统的动力学特征。

The chaotic characteristics of large-particles fluidized bed with 3. 5-4. 5mm mean particle diameter were studied. Phase space restructure was done on Fluidized Bed's pressure fluctuation time sequence. And the relevant dimensions and Lyapunov exponent of restructured phase space were calculated. Minimal state variable numbers describing this kind of large-particles fluidized bed stably circulating were obtained. The results proved that large-particles fluidized bed system belongs to chaos system. It is reasonable to utilize chaos theory to study the pressure fluctuation of large-particles fluidized bed, and to analyze connotative information and the dynamics characters of system.