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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。
The related structural model of pressure pulsation signal of gas-solid fluidized bed was established. Based on the wavelet transform, the self-similar parameter H and the white noise intensity σ_w ~ 2 in the model were determined, so as to confirm that the pressure pulsation signal can be decomposed into the superposition of the fractal Brownian motion and the white noise, and the white noise in the pressure pulsation signal can be calculated quantitatively On the basis of which the law of variation of model parameters under different operating conditions was studied and a physical explanation was given.