Can Low Frequency Accelerometry Replace Pressure Measurements for Monitoring Gas-Solid Fluidized Beds? Articles uri icon

publication date

  • July 2010

start page

  • 4055

end page

  • 4064

issue

  • 13

volume

  • 65

international standard serial number (ISSN)

  • 0009-2509

electronic international standard serial number (EISSN)

  • 1873-4405

abstract

  • This paper is addressed to introduce a methodology based on low frequency accelerometry that can be used for gas-solid fluidized bed monitoring, and for dynamic diagnosis purposes. The proposed methodology
    consists on extracting the low frequency information encoded within an
    accelerometry signal, by means of the Hilbert transform method. The time
    and the frequency domain analysis show how this low frequency
    information is directly related to the conventional pressure fluctuation
    measurements, providing useful information on bulk and bubble dynamics.
    The cross-correlation and the coherence function analysis between the
    pressure and the envelope process of the measured accelerometer signals
    "E", exhibit values approaching unity for frequencies ranging between 2
    and 4 Hz. This reveals that pressure signals and accelerometry envelope
    are related processes. The results from the Coherent Output Power, COP,
    and the Incoherent Output Power, IOP, analysis confirms that both
    pressure and envelope time series exhibit the same global and local
    features open the possibility of using low frequency accelerometers
    instead of conventional pressure transducers for monitoring and for
    dynamic diagnosis purposes.