Applied wigner distribution for pressure fluctuation of gas-solid fluidized bed

摘要

Pressure fluctuation signal has been recognized as an important index for the fluidization quality in the bed.However,there is no accurate and reliable method to extract the embedded information due to highly random nature of fluidization.In this work,the Wigner-Ville spectrum is utilized to describe the strong non-stationarity of the pressure fluctuations' frequency structure.On the basis of statistical analysis and Wigner-Ville spectrum the average major frequency (AMF) is defined to describe the frequency structure of pressure fluctuation.Experimental results indicate that AMF cna well decribe motion of the bubble phase and it can be a useful index for the quality of fluidization.