Abstract
The results of research factual accuracy of the shell stabilizing section of the geokhod prototype are presented. The paper contains an overview of a number of approaches to modeling the mechanisms of formation errors of the ring segmented items and determine its factual accuracy. The problem of experimental verification of the assumptions adopted in the simulation is posed. The study is performed on the basis of experimental data obtained by the coordinate measurement of the geokhod prototype. For the analysis of experimental data, the creation of mathematical models, its research, visualization data and reporting special software is developed. Data is analyzed by the method of mathematical simulation of the shell surface of the stabilizing section in whole and each sector. It is shown that, a significant portion of shell section geometric shape deviations (from 30,3 to 52,3 %) is due to errors in the location of sectors and errors of their radii. On the basis of the simulation absolute values of the respective errors and the actual values of dimensions and deviations are determined. The possibility of providing a given accuracy in the implementation of the shell surface assembly technology used in pilot production is confirmed. At the same time, the proximity of the actual values of the deviations to the limit values can lead to problems in ensuring the consistent quality of geokhod bodies in serial production. The correlation analysis of the data and statistical analysis of series of residuals of the developed models are made. Correlation analysis confirms the dependence of the deviations of the experimental points from their cylindrical coordinates, which confirms the importance of the location of the error sectors in deviations from the geometric precision shell. The results of the statistical analysis of series of models of residues shows that the error location and error sectors of their radii are not the only ones, are significant factors in shaping inaccuracies shell stabilizing section.
Keywords: large segmented-ring items, assembly, accuracy, geokhod, shell.
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