Abstract
The basic elements of an innovative system designed to measure geometric deviations of crankshafts provided with a so-called elastic support system are presented. The support system enables elimination of deflections and elastic deformations of the object measured under the influence of its own weight. The principles of the most suitable support conditions which enable elimination of deflections and elastic deformations of crankshafts under their self-weight were also presented. On the basis of the formulated principles sample calculations of force values of support reactions were performed. This guarantees zero value of deflections on main journals depending on the angle of rotation of the shaft, applying approximated with a mathematical equation applying the calculating method based on the harmonic analysis theory. Then a comparative assessment of the force diagram (the forces were obtained via strength calculations and mathematical model including so called mutual inter-correlation coefficient) was made. The results of comparative analysis showed high correspondence between the compared diagrams. Presented procedures of determining the required forces ensuring elimination of deflections and elastic deformations can be applied to measurements of crankshaft geometrical deviations on the basis of a measuring system with flexible support of a measured object.
Highlights
KRZYSZTOF NOZDRZYKOWSKI *The basic elements of an innovative system designed to measure geometric deviations of crankshafts provided with a so-called elastic support system are presented
From the point of view of the measurements correctness, an important issue at the stage of size and dimensional crankshaft control is the selection of support conditions eliminating deflection and elastic deformation of the shaft occurring under the influence of its own weight [8, 9]
Presented procedures for determining the required values of reaction forces that guarantee the elimination of deflections and elastic deformations of the shaft have been used in the measurement of crankshaft geometrical deviations, carried out using previously presented measuring system equipped with an elastic support system
Summary
The basic elements of an innovative system designed to measure geometric deviations of crankshafts provided with a so-called elastic support system are presented. On the basis of the formulated principles sample calculations of force values of support reactions were performed This guarantees zero value of deflections on main journals depending on the angle of rotation of the shaft, applying approximated with a mathematical equation applying the calculating method based on the harmonic analysis theory. In many places supported crankshafts of marine engines from the group of largesize machine elements, is their low rigidity and the resulting high susceptibility to elastic deflections. In this type of machine parts, depending on the support conditions, there are elastic deflections with variable sign and value due to changes in shaft rigidity during rotation. From the point of view of the measurements correctness, an important issue at the stage of size and dimensional crankshaft control is the selection of support conditions eliminating deflection and elastic deformation of the shaft occurring under the influence of its own weight [8, 9]
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