STUDY OF UNEVENNESS HEIGHT DISTRIBUTION FOR GRAPHITE PANTOGRAPH CONTACT STRIP
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
An assumption of data distribution is of great importance because in many cases it determines the method that ought to be used to estimate the unknown parameters in the model. In this paper we performed a study of unevenness height distribution for three graphite plates, with different wear degree, used as pantograph contact strips. Using roughness diagram we determined the height, number of asperities and statistical values. With Kolmogorov test we verify the unevenness height distribution for two cases: exponential and normal distribution. We assumed a theoretical repartition, which is compared with empirical repartition. The obtain values for random variable are compared to verify the hypothesis assumed. Then we verify the equality of variance with Fischer-Snedecor test and the equality of mean with Student test for two probes which have the same repartiton. The study results of unevenness for three graphite plates used as pantograph contact strips, based on roughness diagram, let to conclusion that the unevenness height distribution vary with degree of wear.
Authors and Affiliations
Constantin-Florin OCOLEANU, Gheorghe MANOLEA, Grigore CIVIDJIAN, Alin-Iulian DOLAN
Keywords
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