Prokopenko P. Improving the safety of freight machines with reduced containers by improving the means and approaches of conditioning tests

The dissertation work is devoted to the decision of an actual scientific problem of perfection of means and approaches of carrying out running tests of freight cars with the reduced tare. The scientific novelty of the value of the dissertation research is as follows. The introduction substantiates the relevance of the dissertation topic, formulates the purpose and objectives of the research, their connection with scientific programs, indicates research methods, reliability of the results, determines the scientific novelty of the dissertation, practical significance and personal contribution of the author. The first section is devoted to a review of the literature on the topic of work and justification of the choice of areas of dissertation research. The review of systems of estimation of indicators of quality of movement and an estimation of dynamic characteristics of a rolling stock is carried out, the analysis of problems of operation of such cars is executed, and statistics of ladders of freight cars with the reduced container from rails are resulted. Existing projects aimed at improving the dynamics of freight cars are described. Based on the experience of Ukrainian and world scientists, leading scientific organizations, it is concluded that the dynamics and strength of reduced tare of freight cars operated on Ukrainian railways do not meet modern requirements and require the development of technical solutions that will improve the quality of reduced tare of freight cars. The second section formulates the concept of technical solutions for load-bearing systems of freight cars with reduced tare to improve the dynamics and strength. The essence of the proposed improvements is to use hinged elements in its design instead of the existing fixed elements (solid beams, welded joints). A method of in-depth processing of the results of running tests of rolling stock is proposed. The essence is to perform correlation and spectral analysis of the processes studied for different elements of load-bearing structures to identify relationships between oscillatory processes of load-bearing structures, estimating the frequencies at which there is interaction between them and the levels of interaction. The software algorithm of the in-depth estimation of experimental indicators of quality of movement of cars with the reduced tare is developed. In the third section the general requirements to the mobile system for definition of indicators of quality and safety of movement of cars with the reduced tare in the conditions of operation are formulated. The hardware and primary converters of the mobile system are described. The results of theoretical and practical research on the comparison and determination of quality and safety of freight cars with reduced tare of different models and the share of factors that negatively affect the quality and safety of the car.