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Journal of Zhejiang University SCIENCE A 2002 Vol.3 No.1 P.52~56

http://doi.org/10.1631/jzus.2002.0052


Wavelet analysis of pressure fluctuation signals in a gas-solid fluidized bed


Author(s):  ZHEN Ling, WANG Xiao-ping, HUANG Hai, CHEN Bo-chuan, HUANG Chun-yan

Affiliation(s):  Instrument Department, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s): 

Key Words:  wavelet analysis, pressure fluctuation, multi-resolution analysis, fluidized bed, ELF


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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[J]. Journal of Zhejiang University Science A, 2002, 3(1): 52~56.

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pages="52~56",
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doi="10.1631/jzus.2002.0052"
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%A ZHEN Ling
%A WANG Xiao-ping
%A HUANG Hai
%A CHEN Bo-chuan
%A HUANG Chun-yan
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2002.0052

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T1 - Wavelet analysis of pressure fluctuation signals in a gas-solid fluidized bed
A1 - ZHEN Ling
A1 - WANG Xiao-ping
A1 - HUANG Hai
A1 - CHEN Bo-chuan
A1 - HUANG Chun-yan
J0 - Journal of Zhejiang University Science A
VL - 3
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SP - 52
EP - 56
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2002.0052


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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[4] Fan,L.T., Hiraoka,T.H.S., Walawender,W.P., 1981. Pressure fluctuations in a fluidized bed. AICHE J., 27(3):388-396.

[5] Grossmann and Morlet, 1984. Decomposition of Hardy function into square interable wavelets of constant shape. SIAM J.Math. Anal., 15(4): 723-736.

[6] He,Z., Zhang,D.M., Chen,B.C., et al., 1997a. Pressure-fluctuation analysis of a gas-solid fluidized bed using the wigner distribution. AICHE.J. 43(2): 345-356.

[7] He,Z., Zhang,W.D., He,K.M., et al., 1997b. Modeling pressure fluctuation via correlation structure in a gas-solids fluidized bed. AICHE.J., 43(7): 1914-1920.

[8] Mallat, 1989. A theory of multiresolution signal decomposition: the wavelet representation. IEEE Trans., PAMI. 11(7): 674-693.

[9] Schaaf,J.C., Schouten,J.C., Bleek,C.M.vanden, 1998. Origin paopagation and attenuation of pressure waves in gas-slid fluidized beds. Powder Technology, 95: 220-233.

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