This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions.
Volume 15 article 480 pages: 505 - 508
The article is devoted to estimate the center-finders accuracy for holes of large-sized case details. Methodology for analyzing center-finders accuracy using dimensional chains and computational mathematics is proposed. It is shown that the quality classes calculated for a direct task can be extended. The methodology is applied to estimate the accuracy of center-finders with typical construction using the example of the specified tolerances for the deviation from alignment in the turbine K-300-240 and the diesel engine 10D100. As a result of calculating the dimensional chain for a direct task, the following values are obtained: 5 quality class for the first case, and 6 for the second case. To check for the inverse task, a computer program that calculates the closing link by the Monte Carlo method with Gaussian distribution is written. Based on the mutual influence of the center-finder supports, tolerances can be extended to 6 and 7 respectively, without accuracy loss.
State standart 2.308 – 2011. Indications of the tolerances of the shape and arrangement of surfaces. (2012). Moscow: Standartinform Publ. (In Russian).
Tabakov S.V. Postovalova A.A., (2009). Engineering geodesy. Khabarovsk: Publishing house of the FESTU. (In Russian).
RD 50-635-87. Methodical instructions. Chains are dimensional. Basic concepts. Methods for calculating linear and angular chains. (1987). Moscow: Publishing Standards. (In Russian).
Putyato A.V. Kovalenko A.V., (2008). Calculation of dimensional chains. Gomel: BelGUT Publ. (In Russian).
Mikhailov G.A. Voitishchev A.V., (2006). Numerical static modeling. Monte Carlo methods. Moscow: Publishing Center "Academy". (In Russian).
Valetov V.A. Murashko V.A., (2006). Fundamentals of Instrument Technology. St. Petersburg: SPbNRU ITMO. (In Russian).
Gavrilov A.V. Klimenkov S.V. Tsopa E.A., (2010). Programming in Java: Lecture notes. SPb: SPbNRU ITMO. (In Russian).
Palei M.A. Romanov A.B. Braginsky V.A. and others, (2001). Tolerances and fi ts. SPb: Politechnica Publ. (In Russian).
Altuhov V. YA., (1989). Mechanization and automation of maintenance and repair of rolling stock. Moscow: Transport Publ. (In Russian).
Steam turbine K-300-240-1 LMZ. Technical conditions for overhaul. Norms and requirements. (2009). Moscow. (In Russian).