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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (1): 52-56    DOI: 10.1631/jzus.2002.0052
Computer & Industrial Engineering     
Wavelet analysis of pressure fluctuation signals in a gas-solid fluidized bed
ZHEN Ling, WANG Xiao-ping, HUANG Hai, CHEN Bo-chuan, HUANG Chun-yan
Instrument Department, Zhejiang University, Hangzhou 310027, China; Chemical Engineering Deptartment, Zhejiang University, Hangzhou 310027, China
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Abstract  It has been shown that much dynamic information is hidden in the pressure fluctuation signals of a gas-solid fluidized bed. Unfortunately, due to the random and capricious nature of this signal, it is hard to realize reliable analysis using traditional signal processing methods such as statistical analysis or spectral analysis, which is done in Fourier domain. Information in different frequency band can be extracted by using wavelet analysis. On the evidence of the composition of the pressure fluctuation signals, energy of low frequency (ELF) is proposed to show the transition of fluidized regimes from bubbling fluidization to turbulent fluidization. Plots are presented to describe the fluidized bed\'s evolution to help identify the state of different flow regimes and provide a characteristic curve to identify the fluidized status effectively and reliably.

Key words： wavelet analysis      pressure fluctuation      multi-resolution analysis      fluidized bed      ELF     
Received: 18 November 2000     
CLC:  TQ015.9  
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ZHEN Ling
WANG Xiao-ping
HUANG Hai
CHEN Bo-chuan
HUANG Chun-yan
Cite this article:

ZHEN Ling, WANG Xiao-ping, HUANG Hai, CHEN Bo-chuan, HUANG Chun-yan. Wavelet analysis of pressure fluctuation signals in a gas-solid fluidized bed. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(1): 52-56.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0052     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I1/52

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