Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 48, Issue 9-12, Pages 897-903Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-009-2357-4
Keywords
Time series analysis; ARMA models; Weibull distribution; Point processes; Acoustic emission
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We analyse some acoustic emission time series obtained from a lathe machining process. Considering the dynamic evolution of the process, we apply two classes of well known stationary stochastic time series models. We apply a preliminary root mean square (RMS) transformation followed by an auto regressive moving average analysis; results thereof are mainly related to the description of the continuous part (plastic deformation) of the signal. An analysis of acoustic emission, as some previous works show, may also be performed with the scope of understanding the evolution of the ageing process that causes the degradation of the working tools. Once the importance of the discrete part of the acoustic emission signals (i.e. isolated amplitude bursts) in the ageing process is understood, we apply a stochastic analysis based on point processes' waiting times between bursts and to identify a parameter with which to characterise the wear level of the working tool. A Weibull distribution seems to adequately describe the waiting times distribution.
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