Evaluation Method of Allowable Variance for Results of Tribological Measurement on the Basis of Their the Coherence Trends and Of the Covariance Trends

This article discusses the possibility of assessing the technical condition of rolling bearings based on tribological tests of oil samples. The problem is to define diagnostic levels, especially when has a relatively small number of measurements (3, 4, 5 etc.). Rating variance of measurements can be...

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Bibliographic Details
Published in:Journal of KONBiN 2015-01, Vol.27 (1), p.73-86
Main Authors: Zboiński, Marek, Lindstedt, Paweł, Deliś, Maciej
Format: Article
Language:English
Subjects:
ball bearing
Coherence
Covariance
diagnostic level
Diagnostic systems
Dimensional measurements
Roller bearings
the diagnostic signals
the variance of data
Trends
Tribology
Variance
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Summary:This article discusses the possibility of assessing the technical condition of rolling bearings based on tribological tests of oil samples. The problem is to define diagnostic levels, especially when has a relatively small number of measurements (3, 4, 5 etc.). Rating variance of measurements can be performed using the dimensionless factor covariance ρ(τ) and the dimensionless coherence function y2(a). The set is compact enough when ρ ()) and γ 2(a) will be close enough to oscillate around the value of 1 [1, 3]. In summary, it is concluded that the thresholds S, 2S, 35 are reliable when ρ()) and y2(a) are greater than 0.7 [6].
ISSN:2083-4608
1895-8281
2083-4608
DOI:10.2478/jok-2013-0107