气固流化床中信息熵的实验研究

Experimental Studies of Information Entropy in Gas-solid Fluidized Bed

在Shannon信息理论中的信息熵与互信息概念基础上，定义了信息传输率，用以在重构相空间中研究从气固流化床内不同测量点的压力脉动时间序列之间的关联。实验结果证明了流化床内不同点之间存在着高速、三维的信息传输关系，提出了信息是通过床内粒子的扰动传输的，并由实验数据给出了这种压力脉动信息传输的平均速率及其随气速的变化规律。

The gas-solid fluidized bed is a complex system which involves many dynamic parameters and disturbance of noises, so it is difficult to obtain the weak embedded information from single time series. Based on the concept of information entropy and mutual information in Shannon information theory, the information transport rate is defined to investigate the dependence between pressure fluctuation time series in the reconstruction phase space at two different positions in the fluidized bed. A new function of information transfer rate (ITR) is defined on the base of the concepts of information entropy and mutual information entropy. Some curves of the information entropy and the ITR changing with the operating conditions are given. Basing on the results of the ITR between the measured time series at dual different probes, the authors proposed that information is transferred upwards and downwards with a high propagation velocity through the disturbance of particles in fluidized beds. The average information transfer velocity decreases with the increasing of gas superficial velocity.