Abstract
Purpose. The article deals with the determining the influence of the longitudinal and lateral shift of gravity centre of the heavy load on the flat wagons, taking into account the travel speed based on the main dynamic indicators – the maximum coefficients of the dynamic supplement of spring-suspended and unsprung parts, the maximum ratio of frame force to static axle load, the wheel derailment safety factor. Methodology. The study was carried out using the method of mathematical and computer simulation of the dynamic loading of flat wagons based on the model of spatial oscillations of five coupled wagons and the software complex developed in the branch research laboratory of the rolling stock dynamics and strength (BRL RSDS). Theoretical studies were carried out during the movement of the model 13-401 flat wagon on typical 18-100 bogies with speeds in the range from 50 to 90 km/h in curves with radii of 350 and 600 m, with 130 and 120 mm canting, respectively. Findings. The paper presents the analysis of theoretical studies of the rolling stock dynamics on the example of flat wagons. The calculations were carried out using an application software package. In the course of performing theoretical studies and after simulation, taking into account the processes of oscillation of the flat wagon and load in the presence of longitudinal and lateral shift of its gravity centre, the dependences of the main dynamic indicators were obtained with regard to the magnitude of the travel speed. Originality. Using the mathematical model of the five coupled wagons, the effect of shift in two directions from the central symmetry axis of the heavy load centre was studied with regard to the travel speed along the curved track of small and medium radius in order to determine the dynamic loading of the flat wagon. Practical value. As a result of the above theoretical studies, the recommendations on the maximum possible values of the centre shift of heavy loads during their transportation on flat wagons are substantiated and proposed.
Highlights
The process of integrating the railway industry of Ukraine into the European transport system is one of the urgent problems of today
The purpose of this research is to determine the influence of the longitudinal and lateral shift of gravity centre of the heavy load on the flat wagon, taking into account the travel speed based on the main dynamic indicators – the maximum coefficients of the dynamic supplement of springsuspended and unsprung parts, the maximum ratio of frame force to static axle load, the wheel derailment safety factor
In the given study we considered the influence of the load center shift on the flat wagon in the longitudinal and transverse directions, as well as in both directions simultaneously
Summary
The process of integrating the railway industry of Ukraine into the European transport system is one of the urgent problems of today. Its solution is connected with the formation of a network of international transport corridors on the territory of Ukraine, the reconstruction of the main railway lines connecting the Europe and Ukraine, the organization of high-speed train traffic [10]. One of the key issues of transport policy, which is associated with perspectives of sustainable development of the transport industry in Ukraine, is the promotion of combined transport. This technology should be in line with international standards, the main criteria of which are: route speed, schedule accuracy and cargo safety. Improvement of speed characteristics of rolling stock becomes almost the most important task for increasing the competitiveness of rail transport in mixed traffic systems
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