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Information × Registration Number 0218U006874, 0116U005509 , R & D reports Title Development of the scientific principles of diagnosis of mechanical transport systems on the basis of the analysis of dynamic oscillation processes of their elements popup.stage_title Head Nozhenko Olena, Registration Date 28-09-2018 Organization Volodymyr Dahl East Ukrainian Nstional University popup.description2 Object of research - Dynamic and strong-strength processes of energy interaction arising in elements of the mechanical system "rolling stock-track". The purpose of the work is to reliably and reasonably determine the relationship between the technical state and the dynamic processes occurring in the elements of structures of the mechanical system "rolling stock-wheel"; evaluate the energy component of the interaction between these processes on the basis of a significant amount of data stored during operation, and set parameters for an intelligent decision-making system for determining the technical state of the system in real time. Research methods: - during the analysis of the work in the direction of assessing the technical condition of rail vehicles - the method of system analysis and synthesis of information, the method of expert assessments, the method of functional analysis; - mathematical and simulation modeling of dynamic characteristics of locomotives and cars and numerical methods for solving differential equations, integration of differential equations; - in experimental studies - in-person tests, physical simulation, simulation methods, experiment planning, mathematical processing of experimental results. Results of research: 1. The method of monitoring workloads acting on the rolling stock on the track structure is proposed. The developed method is based on measurements of acceleration of rails in vertical and horizontal transverse directions. 2. An algorithm of pre-processing of a signal, which performs in an automatic mode of splitting a multidimensional signal into segments, is associated with certain wheels, and does not require additional information on speed and type of rolling stock. The method of calculating vertical and horizontal displacements of rails obtained by integrating accelerations in forward and reverse directions (time) is proposed. 3. Comparison of statistical parameters of the studied values ??of stresses and accelerations of rails during the passage of a shunting locomotive showed that the speed in the range of 10 ... 40 km / h does not have a significant effect on the statistical parameters of the values ??of eddy tension rails, both when driving an empty gondola and when driving loaded . In contrast to the stresses, the magnitude of the acceleration of the rail when driving the maneuvering locomotive linearly depends on the speed of movement, with this trend observed as in the vertical, the magna max reaches 227 m / s2, and in the horizontal, the magnaY reaches 283 m / s2, directions. Correlation dependence between edge stresses and accelerations of rails, which reaches 0.5 - 0.6, is established. Spectral analysis of acceleration rails revealed the presence of frequencies in the range 250 - 600 Hz in the vertical and 300 - 750 Hz in horizontal directions. 4. The concept of estimation of defective wheels of the railway rolling stock was developed based on the results of analysis of records of acceleration of rails while driving a rolling stock. The concept of identification of defective wheels of rolling stock on the basis of analysis of acceleration of rails and detection of increased shock loads has been developed. 5. A mathematical model of the system "rolling stock-track" is created, taking into account the dynamic component of the interaction of the elements of the system, the characteristics of the connection between them, as well as the stress-strain state, to identify the output of the technical state beyond the normative set level. 6. The influence of speed and axial load on the magnitude of RMS acceleration of the rail is analyzed. The acceleration range of the rail depends heavily on the axle load. It can be seen that with a high axle load, the response range of the rail is preferably less than 500 Hz. On the other hand, with less load on the axle, the response spectrum generally exceeds 500 Hz. This indicates the interconnection of the dynamic response of the rail with the speed of the train and the axial load and justifies the possibility of assessing the dynamic force of the rolling stock by measuring the acceleration of the rail. 7. The dynamical impact of special freight wagons on the track as a result of modeling requires the development of a number of technical solutions for their improvement, a number of technical solutions were developed, which, together with Czech and Slovak colleagues, provided several patents for inventions and utility models. The directions of the improvement of the trolley carriage were also proposed, and the use of wheel pairs with independent comb rotation as a method of improving the dynamic characteristics of wagons and locomotives during the passage of the curves of the track areas was substantiated. Product Description popup.authors Кара Сергій Віталійович Ковтанець Максим Володимирович Кравченко Катерина Олександрівна Мостович Анатолій Валентинович Ноженко Володимир Сергійович Ноженко Олена Сергіївна Просвірова Ольга Вікторівна Семенов Станіслав Олександрович Суслов Євген Федорович Цихмістро Сергій Іванович popup.nrat_date 2020-04-02 Close