Abstract: In this paper, the correlation structure model of pressure fluctuations in a gas - solid fluidized bed is established. The self- similar parameter H and the intensity parameter σw of Gaussian white noise in the model are determined by the help with wavelet transform. Consequently, it is proved that the pressure fluctuations can be decomposed into the addition of Fractal Brownian Motion (FBM) and Gaussian White Noise (GWN), and the content proportion of the GWN in the signal is figured out. Finally, the changes of H and σw in different operating conditions are studied and physical interpretation is given.

摘要： 建立了气固流化床压力脉动信号的相关结构模型。基于小波变换确定了模型中的自相似参数H和白噪声强度σ_w~2,从而确证该压力脉动信号可以分解成分形布朗运动和白噪声的叠加,并定量计算出压力脉动信号中白噪声所占的百分比,在此基础上,研究了模型参数在不同操作条件下的变化规律,并给出物理解释。