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.

Наука та прогрес транспорту. Вісник Дніпропетровського національного університету залізничного транспорту, 2013, вип. 4 (46) ПРОМИСЛОВИЙ ТРАНСПОРТ

In the paper the results of experimental-and-theoretical evaluation of strength indices for central swing bolsters of diesel trains DR1A are presented and the variants of modernization and improvement of the strength indices are recommended.

In the paper the methods of estimation of the accrued operating times perceived by the rolling stock supporting structures during their operation are considered; the concrete examples of their use are presented.

Purpose. The purpose of article is to develop the measures of hardness indices improvement of the supporting structures of motor cars of the electric trains ED9M. Methodology. In order to achieve the above stated aims the following measures had to be done: to develop a finite element model of the supporting structures of the motor bogie of the electric train ED9M, determine parameters of the developed model; perform the calculations to determine the stress-strain state during loads corresponding to different operating conditions with the search of geometric parameters reducing the highest stress levels. Findings. The obtained results of calculations (fields of stress distribution and strains in the elements of the motor bogie frame) from the viewpoint of the strength and stiffness discovered the best geometric parameters of the bearings in the central suspension beams of the electric trains ED9M in the places of load transmission from the car body to the bogie frame. Originality. Based on the developed finite element models and the theoretical and experimental researches the scientifically grounded modernization measures of the construction elements of the central suspension beams for motor bogies of the electric trains ED9M were developed. Practical value. It was developed an engineering solution concerning the measures to improve the strength and stiffness characteristics of the central suspension beams for the motor cars of the electric trains ED9M. It was given to the Ukrzaliznytsya's professionals to implement them during repairs.