周期信号对计算流化床动力学重构滞时的影响

IMPACT OF PERIODIC SIGNAL ON DELAY TIME OF RECONSTRUCTED DYNAMIC IN FLUIDIZED BED

应用混沌理论从流化床压力波动时间序列来研究流化床动力学行为的首要任务就是确定重构相空间滞时 .针对流化床压力波动中可能存在的周期信号对重构滞时产生的影响 ,提出从压力波动时间序列中提取周期趋势项以去除压力波动信号中可能存在的周期信号 ,然后用互信息法确定滞时 ,取得了较好的结果 .

The first task of applying deterministic chaos theory to studying the dynamics of fluidized bed from the time series of pressure fluctuation is the computation of delay time of reconstructed phase space. This paper studies the influence of periodic and stochastic signal on the computation. It is suggested that the periodic components that possibly exist in the measured instantaneous pressure could make the delay time correspond to the first minimum of mutual information increase, such as the result of Dow and Halow [6] .A method of extracting periodic tendency term from the instantaneous pressure signal and its statistics test are provided. After removing periodic components from the original signal, the delay time that corresponds to the first minimum of mutual information can be determined correctly.