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Comparative studies of reference measurements of cylindrical surface roundness profiles of large machine components

Nozdrzykowski K., Janecki D.

Metrology and Measurement Systems

2014

Vol. 21, nr 1

67--76

The article presents results of comparative tests performed to verify the conformity of geometric deviation measurements of a crankshaft carried out at a test bed equipped with a system of elastic support with measurements adopted as reference values. A number of simulation tests were carried out with varied shaft support conditions using the proposed measuring system. The selection criteria were established for support parameters. Meeting these criteria guarantees that shaft elastic deflections and strains are eliminated. Consequently, such strains will not affect the estimation of geometrical deviations of the measured object. The comparative evaluation measurement of roundness profiles and values of roundness deviations of main crankshaft bearing journals of a marine medium speed engine was performed using a correlation calculus. The results have revealed high conformity of both determined roundness deviation values and measured profiles compared to the reference ones.

Aspects of using correlation calculus in comparative measurements of geometric deviations and shape profiles of main crankshaft bearing journals

Nozdrzykowski K., Bejger A.

Zeszyty Naukowe / Akademia Morska w Szczecinie

2013

nr 35 (107)

114--117

This article discusses possible applications of correlation calculus as a universal tool enabling verification of a procedure for correct selection of elastic support system. Such system is used in measurements values of roundness deviations of main crankshaft bearing journals and assessment of shape correctness of measured roundness profiles. These profiles can be mathematically represented as a sum of terms of a Fourier trigonometric series.