• CN: 11-2187/TH
  • ISSN: 0577-6686

›› 2004, Vol. 40 ›› Issue (5): 87-91.

• Article • Previous Articles     Next Articles

CEPSTRUM-BASED ANALYSIS METHOD FOR THE AUTO CORRELATION OF ROUGH SURFACE PROFILE

Li Chenggui   

  1. School of Instrument Science and Opto-electrical Engineering, Beijing University of Aeronautics and Astronautics
  • Published:2004-05-15

Abstract: Rough surface topography influences a certain number of tribological phenomena like contact pressure, adherence, friction, wear and lubrication. Therefore it is very important to describe the character of rough surface profile. The cepstrum analysis is a new signal processing technique in recent years, and is widely applied to analyse the signal and its echo in the areas of earthquake, speech recognition, acoustics et al. A cepstrum-based analysis method is presented for the auto-correlation of rough surface profile. Some experiments of cepstrum analysis on a few kinds of representative machining specimens are made. The results show that the method based on cepstrum can be used to analyse the auto-correlation of random surface profile effectively, and its analysis sensitivity is superior to the conventional auto-correlation function. Furthermore this method has the advantage of identifying the correlation length of the profile exactly and reasonably.

Key words: Auto-correlation function, Cepstrum analysis, Roughness

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