Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2014, № 2 (50) ПРОМИСЛОВИЙ ТРАНСПОРТ

The methods of reproduction during realization of vibrating tests of vibrations perceived by complex bearing designs of the rolling-stock cars in the letter are considered.

Purpose. The objective is to determine the stress-strain state of supporting structures of the head car body and the traction transmission unit, which can be created in the operation of emergency situations, and to develop the measures aimed at improving the stress-strain state of these elements. Methodology. In order to achieve this objective, in performing the work an experimental determination of efforts and stress levels in the most loaded elements of supporting structures as well as the traction transmission units was conducted; design models for the theoretical determination of stress and effort levels were developed. Findings. Based on the analysis of the calculation results the best options for the upgrades, which have been put into the basis of proposals aimed at improving the strength indices, were revealed. Originality. Based on the experimental and theoretical studies, scientific monitoring of development works on modernization and improvement of strength indices of supporting structures of head cars of diesel trains DR1A was performed. Practical value. The technical solution to the measures, which are to be carried out beyond the limits of assigned operation lifetime for diesel train of the series specified was developed and transferred to the Ukrzaliznytsia experts to introduce the proposed measures on improving the strength indices.

The aim is to develop the scientific substantiation technical regulation of measures and conditions in electric trains, series ER1, ER2 beyond the extended period of operation life (over 50 years). Methodology. To achieve this goal the scientific publications analysis on the survivability of the basic elements of supporting constructions that are loaded with dynamic alternating loads was carried out. The results analysis of vibration bench tests of bogie frames of electric trains ER1, ER2, which were obtained by using the developed technique for such tests with authors, was carried out too. Technical solutions with appropriate measures under which it is possible to extend the operation life of bearing structures of electric trains ER1 and ER2 were developed over 50 years. Findings. Results were obtained on the complex basis of conducted experimental and theoretical research. They have promoted to the working out the methodology for assessing the period of crack development in the tensest points of main bearing structures of bogie frames and bodies of electric trains ER1, ER2 with achieving their dangerous sizes. This allowed developing a technical regulation measures to ensure the safe operation of the main bearing structures of bogie frames and bodies of electric trains ER1, ER2 beyond 50 years. Originality. To ensure the safe trains operation, series ER1, ER2 the method estimation of crack development term in the tensest points of bearing structures of bogie frames and bodies with achieving their dangerous sizes was worked out. Practical value. The technical regulation of measures ensuring the safe operation of the main bearing structures of bogie frames and bodies of electric trains ER1, ER2 beyond 50 years was developed.

In the article the results of a set of works directed to providing the prolongation of service life of the traction assemblies OPE1A (ОПЭ1А) are presented.