Özet:

This paper substantiates prolonging the service life of a covered railroad freight car that has exhausted its rated life of operation. In this case, the actual amount of wear of the bearing structure elements, registered during operation, have been taken into consideration. The reported calculations showed that the design service life of the bearing structure of a covered freight car when taking into consideration the extension of operation, is not less than 2 years. Mathematical modeling was carried out to determine the dynamic load on the bearing structure of a covered freight car. It has been established that the maximum accelerations that act on the bearing structure of a covered freight car are 42 m/s2. In order to determine the acceleration distribution fields relative to the bearing structure of a covered freight car, a computer simulation was performed. The calculations showed that the maximum acceleration amounts to 43.2 m/s2 and is concentrated in the middle part of the girder beam. F-criterion was used to verify the dynamic load models. The maximum equivalent stresses of the bearing structure of a covered freight car were determined taking into consideration the wear of its components. It was found that the maximum equivalent stresses occur in the area of interaction between the girder beam and the rod beam and amount to 344 MPa. In other words, the maximum equivalent stresses do not exceed permissible ones. The basic dynamic indicators for a covered freight car have been calculated. The maximum accelerations that act on the bearing structure of a covered freight car in the center of masses reached about 5 m/s2. The acceleration of the body in the regions of resting on bogies was about 6 m/s2. The travel of the car is rated «good».This study would contribute to improving the efficiency of the transportation process, as well as the functioning of railroad transport Author Biographies Oleksij Fomin, State University of Infrastructure and Technologies Kyrylivska str., 9, Kyiv, Ukraine, 04071 Doctor of Technical Sciences, Professor Department of Cars and Carriage Facilities

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