Novel adaptation of the demodulation technology for gear damage detection to variable amplitudes of mesh harmonics

F. Combet, L. Gelman

Research output: Contribution to journalArticle

22 Citations (Scopus)


In this paper, a novel adaptive demodulation technique including a new diagnostic feature is proposed for gear diagnosis in conditions of variable amplitudes of the mesh harmonics. This vibration technique employs the time synchronous average (TSA) of vibration signals. The new adaptive diagnostic feature is defined as the ratio of the sum of the sideband components of the envelope spectrum of a mesh harmonic to the measured power of the mesh harmonic. The proposed adaptation of the technique is justified theoretically and experimentally by the high level of the positive covariance between amplitudes of the mesh harmonics and the sidebands in conditions of variable amplitudes of the mesh harmonics. It is shown that the adaptive demodulation technique preserves effectiveness of local fault detection of gears operating in conditions of variable mesh amplitudes.

Original languageEnglish
Pages (from-to)839-845
Number of pages7
JournalMechanical Systems and Signal Processing
Issue number3
Early online date23 Jul 2010
Publication statusPublished - 1 Apr 2011
Externally publishedYes


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