Amplitude-cyclic frequency decomposition of vibration signals for bearing fault diagnosis based on phase editing

Leonardo Barbini, Mario Eltabach, A. J. Hillis, J. L. du Bois

Research output: Contribution to journalArticlepeer-review

20 Citations (SciVal)


In rotating machine diagnosis different spectral tools are used to analyse vibration signals. Despite the good diagnostic performance such tools are usually refined, computationally complex to implement and require oversight of an expert user. This paper introduces an intuitive and easy to implement method for vibration analysis: amplitude cyclic frequency decomposition. This method firstly separates vibration signals accordingly to their spectral amplitudes and secondly uses the squared envelope spectrum to reveal the presence of cyclostationarity in each amplitude level. The intuitive idea is that in a rotating machine different components contribute vibrations at different amplitudes, for instance defective bearings contribute a very weak signal in contrast to gears. This paper also introduces a new quantity, the decomposition squared envelope spectrum, which enables separation between the components of a rotating machine. The amplitude cyclic frequency decomposition and the decomposition squared envelope spectrum are tested on real word signals, both at stationary and varying speeds, using data from a wind turbine gearbox and an aircraft engine. In addition a benchmark comparison to the spectral correlation method is presented.

Original languageEnglish
Pages (from-to)76-88
Number of pages13
JournalMechanical Systems and Signal Processing
Early online date3 Nov 2017
Publication statusPublished - 15 Mar 2018


  • Diagnostics of defective bearings
  • Enhanced squared envelope spectrum
  • Phase editing
  • Spectral correlation
  • Variable speed

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications


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