Статті КЗПФЗТ (ЛІ) (Раніше КФД (ЛФ))
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Item Assessment and Rating of the Investment Capacity for the Territorial Communities of the Lviv Region(Slovak University of Technology in Bratislava, 2021) Siryk, Zinoviy; Popadynets, Nazariy; Bilyk, Rostyslav; Hrаfskа, Oryslava; Blynda, YuriyENG: The paper analyzes the capacity and investment opportunities of existing territorial communities. The assessment and rating of the investment capacity for the territorial communities of the Lviv region has been carried out. A model of the financial and investment support system for territorial communities has been developed, including several blocks (material and financial resources of the territorial communities budgets; other internal and external sources of financing their investment needs; ability of local self-governments to mobilize resources of business entities, households, individuals, etc. for implementation of the investment community needs; organizational and managerial capabilities of the territorial communities authorities to solve investment problems; regulatory and legal activity field of local governments), each of which is a separate element of this system. It has been determined that the investment project will always have an impact on the territories of self-governing communities, the only question is how and by what indicators this impact will be predicted in the current period and strategic perspective.Item Cracks Interaction in the Elastic Composite under Action of the Harmonic Loading Field(Tbilisi State University, Georgia, 2018) Stankevych, Volodymyr Z.; Butrak, I. O.; Kovalchuk, Vitalii V.EN: A three-layer composite with penny-shaped cracks in the field of harmonic torsional loading is considered. The solutions are chosen in the form of Helmholtz potentials with densities that characterize unknown crack opening functions. The problem is reduced to the solution of the system of two-dimensional boundary integral equations (BIFs). The influence of the frequency of the applied load, the ratio of the elastic constant parameters of the composite on the dynamic stress intensity factors in the defect vicinity is investigated.Item Decentralization of Local Self-government under the Conditions of Administrative-Territorial Reform in Ukraine(Growing Science Publishing Company, 2021) Siryk, Zinoviy; Popadynets, Nazariy; Pityulych, Mykhaylo; Chakii, Olha; Irtyshcheva, Inna; Panukhnyk, Olena; Hyk, Vasyl; Fedotova, Yana; Rohozian, Yuliia; Lysyak, NataliiaENG: The essence of administrative and territorial reform and decentralization reform in Ukraine is to move away from a centralized model of government in the state, ensure the ability of local self-government and build an effective system of territorial power organization in Ukraine based on the principles of subsidiarity, omnipresence and financial self-sufficiency of local self-government. The purpose of the article is to identify areas for improving the effectiveness of the administrative-territorial reform in Ukraine based on assessing the results of its financial decentralization component. Peculiarities of changing the territorial basis of local self-government in Ukraine investigate the necessity of moving from a voluntary amalgamation of territorial communities to the stage of their formation according to clearly defined criteria and providing opportunities for the development of such communities in the future. It focuses on the need to consolidate areas and change the system of interaction of the subregional level with the amalgamated territorial communities at a basic level.Item Determining Patterns in the Stressed-Deformed State of the Railroad Track Subgrade Reinforced with Tubular Drains(РС ТЕСHNOLOGY СЕNTЕR, Kharkiv, Ukraine, 2020) Luchko, Josyp; Kovalchuk, Vitalii V.; Kravets, Ivan B.; Gajda, Oleksiy; Onyshchenko, ArturEN: The technical condition of the railroad track subgrade has been analyzed, as well as the issues related to ensuring its strength and stability when exposed to floodwaters and when the track's sections are overmoistened during operation. As a result, it has been established that it is necessary to develop methods aimed at improving the subgrade's carrying capacity. The georadar research has explored the problematic areas of the railroad track subgrade, based on which the distribution of subgrade heterogeneity in the vertical plane, as well as the boundaries of its location, were established. Therefore, georadar research makes it possible to detect hidden defective sites in the subgrade without disrupting its strength characteristics. A technique has been proposed to improve the carrying capacity of the failed subgrade of a railroad track using the combined arrangement of drainage pipes in the vertical and horizontal directions in the railroad embankment. The special feature of this technique is the possibility to drain water at the different levels of surface water, which provides for an increase in the carrying capacity of the failed subgrade. The strained-deformed state of the subgrade reinforced with tubular drainage has been investigated. The result has proven the effectiveness of the use of tubular drainages to improve the carrying capacity of the railroad track overmoistened subgrade exposed to constant and temporary loads. This study findings have established that the deformity of the subgrade increases when using tubular drainage, though this occurs only in the initial period of its arrangement, in further operation, when it removes water from the subgrade body, the carrying capacity of the subgrade, on the contrary, will improve due to the enhanced physical and mechanical properties of soils.Item Determining the Causes of Rolling Stock Derailment From the Track Using Modern Research Methods(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Kuzyshyn, Andriy; Batig, Andriy V.; Sobolevska, Julia H.; Kostritsa, Sergei A.; Ursulyak, Lyudmila V.; Dovhaniuk, Stepan S.EN: Abstract. The analysis of cases of rolling stock derailment from the track at PJSC «Ukrzaliznytsia» over the past 5 years has been carried out and their main types are given. It is noted that the rapid development and improvement of computer technology allows the use of computer and mathematical modelling in the study of cases of rolling stock derailment from the rail track, which makes it possible to take into account a combination of factors that have the main influence on the behavior of rolling stock when moving along the track. It has been established that the first step is the construction of a mathematical model of an object using a selected type of mathematical description: algebraic, differential, integral equations, discrete mathematics, set theory, and others. And the second step is the choice of a method for solving these models. The simulation methods are given, which, depending on the programming style, are divided into: procedural-oriented, object-oriented, logical-oriented, rule-oriented, and oriented to constraints. An objectoriented programming of a freight car has been developed, which will make it possible to evaluate its main dynamic indicators, in particular, indicators of stability from derailment. This in turn will facilitate the establishment of the main causes of rolling stock derailment from the rail track.Item Improving a Methodology of Theoretical Determination of the Frame and Directing Forсes in Modern Diesel Trains(PC "Technology Center", Ukrainian State University of Railway Transport, Kharkov, 2018) Kovalchuk, Vitalii V.; Kuzyshyn, Andrii Ya.; Kostritsa, Sergey A.; Sobolevska, Yuliia H.; Batig, Andriy V.; Dovhaniuk, Stepan S.EN: The method for determining the directing force was improved, taking into consideration the effect of transverse creep forces and the angle of the directing force inclination to the vertical axis. It was established that when determining the directing force, it is necessary to check the gap between the wheel flange and the rail head which is difficult to realize without computer simulation. When determining the frame force on the axle of the wheel set, a comprehensive approach was adopted taking into account geometric irregularities of the track path, both in vertical and horizontal planes; longitudinal and transverse creep forces at the point of the wheel-rail contact and influence of adjacent wheel sets of the diesel train car. Dependences of the frame and directing forces on speed of the carriage movement and the value of amplitude of the horizontal irregularity of the rail track were obtained. It was established that when moving in the straight section of the track, an increase in speed from 0 m/s to 50 m/s results in a rise in the value of the frame force: up to 8.3 kN for the first wheel set and 19.37 kN for the second wheel set and the directing force up to 31.38 kN for the first wheel set and up to 46.83 kN for the second wheel set. The increase in amplitude of the horizontal irregularity of the track, which is one of the primary causes of occurrence of forced oscillations of the carriage section above the springs also leads to an increase in numerical values of the forces of interaction of the rolling stock with the rail track. All this can bring about an increased power influence of the wheel set on the track and a negative impact on the basic criteria of traffic safety. Influence of the carriage movement speed on the value of transverse creep forces was studied. It has been established that with an increase in the carriage speed from 0 m/s to 50 m/s, these forces grow from 0 to 15.75 kN for the 1st wheel set and from 0 to 29.22 kN for the 2nd wheel set. This indicates impermissibility of neglecting the transverse creep forces when determining the directing force. Comparison of numerical values of the directing force determined by different methodologies was performed. It has been established that the methodology used in conducting forensic examination of railroad accidents may result in underestimation of fulfillment of the derailing condition. At the same time, calculations according to the formula improved in this study give an opportunity to obtain the results most approximate to the real operation conditions. Comparison of the experimental and theoretical calculated values of the frame force acting on the first wheel set of the diesel train car was made and their practical coincidence was shown. Discrepancy of the compared values of the frame force was within 7.2 %.Item Investigating the Influence of the Diameter of a Fiberglass Pipe on the Deformed State of Railroad Transportation Structure “Embankment-Pipe”(РС Тесhnology Сеntеr, 2022) Kovalchuk, Vitalii V.; Sobolevska, Yuliya; Onyshchenko, Artur; Bal, Olena M.; Kravets, Ivan B.; Pentsak, Andriy; Parneta, Bogdan Z.; Kuzyshyn, Andriy; Boiarko, Vladyslav; Voznyak, Oleh M.ENG: This paper has analyzed the use of fiberglass pipes in the body of the railroad embankment by a method of pushing them through the subgrade. A flat rod model has been improved for assessing the deformed state of the transport structure "embankment-fiberglass pipe" by a method of forces when replacing the cross-section of the pipe with a polygonal one. The analytical model accounts for the interaction between the pipe and soil of the railroad embankment. To this end, radial and tangential elastic ligaments are introduced into the estimation scheme, which make it possible to simulate elastic soil pressure, as well as friction forces that occur when the soil comes into contact with the pipe. The deformed state of the transport structure "embankment-fiberglass pipe" was calculated by the method of forces and by a finite-element method under the action of load from the railroad rolling stock, taking into consideration the different cross-sections of the pipe. It has been established that with an increase in the diameter of the fiberglass pipe, the value of deformations of the subgrade and fiberglass pipe increases. With a pipe diameter of 1.0 m, the deformation value in the vaulted pipe is 2.12 mm, and with a pipe diameter of 3.6 m – 4.16 mm. At the same time, the value of deformations of the subgrade under the sleeper is 5.2 mm and 6.0 mm, respectively. It was determined that the maximum deformations of the subgrade, which occur above the pipe, with a pipe diameter of 3.6 m, are 4.46 mm. At the same time, the maximum vertical deformations of a fiberglass pipe arise in the pipe vault and, with a pipe diameter of 3.6 m, are 4.16 mm. It has been established that the maximum horizontal deformations of the subgrade occur at points of horizontal diameter of the fiberglass pipe while the minimal horizontal deformations of the subgrade occur at points lying on the vertical diameter of the pipe.Item Investigating the Temperature Field Distribution Over Transport Structures’ Metal Corrugated Construction Surface under Temperature Influences(Széchenyi István University, Győr, Hungary, 2022) Kovalchuk, Vitalii V.; Kravets, Ivan B.; Nabochenko, Olga S.; Petrenko, Oleksiy V.; Milyanych, Andriy R.; Hermaniuk, Yuliia M.; Dzhus, Volodymyr S.ENG: The experimental studies results of temperature distribution over metal corrugated sheet structure surface at positive and negative ambient temperatures are presented. It is established that the temperature is distributed unevenly over the sheet surface along its plane. An analytical method for calculating the temperature field from a fragment of a structure metal sheet in the case of setting the temperature at the sheet area boundaries is presented. The calculation of the temperature field distribution on the metal sheet of the structure with the setting of the temperature along the contour of the sheet is performed. As a result, it is established that at the metal sheet boundaries there is a temperature difference, which can cause the occurrence of temperature stresses and deformations.Item Management of Corporate Social Activity in the Organization(IAEME Publication, 2020) Dykha, Mariia; Cheban, Yuliia; Bilyk, Olena; Siryk, Zinoviy; Khytra, Olena; Dudnyk, AllaEN: The article discusses the theoretical and practical aspects of corporate social activity management. An algorithm for CSA management in the organization is proposed, in which the place for evaluating the effects of CSA is defined and the criteria for the evaluation management model are formulated, including mandatory prerequisites, the presence of stages and the possibility of making changes in the management of corporate social activities in accordance with the evaluation results. A methodology for analyzing and evaluating CSA is proposed and tested using a real example, which allows you to really assess the level of ongoing social work at the levels of individual areas, CSA areas and the social development management system of the enterprise as a whole. All this allows not only to increase the efficiency of reproduction of the human potential of the organization but also to strengthen the market position of the enterprise through the formation of its positive image and increase investment attractiveness.Item Mathematical Model of the Derailed Train Wheel Motion(Silesian University of Technology, Poland, 2016) Bodnar, Borys Ye.; Bolzhelarskyi, Yaroslav V.; Laushnyk, Igor P.ENG: It is developed a mathematical model of the derailed train wheel motion, which makes it possible to determine a change in its speed when moving on the track panel. When constructing the model the methods of theoretical mechanics and train traction were used. It was found that the highest speed reduction occurs as a consequence of the wheel impact on the sleeper. The model allows creating a generalized mathematical model of the train motion in the emergency mode.Item Modelling of Land Relations in Ukraine in the Period of Institutional Transformations(IAEME Publication, 2020) Shynkaruk, Lidiia; Yermolenko, Dmytro; Buchniev, Maxym; Bulysheva, Daria; Siryk, Zinoviy; Tsokol, OlhaEN: The complex process of land reform in Ukraine predetermined a specific approach to emerging land relations and the land market. The article discusses the main characteristics of land relations in Ukraine, the factors affecting their formation, and also identify the central and critical milestones on the path of the transition of land relations from the state monopoly to market relations. The ongoing land reform and institutional transformations make the process of modelling land relations a non-trivial economic and mathematical task; therefore, the methodology is proposed in the article, which allows modelling the economic processes of land relations in the context of the real economic situation in the country. The main objective of the proposed methodology is to enable the construction of an existing model that serves as a basis for modelling current processes and will become the basis for long-term forecasts.Item Practice of Administrative and Territorial Reform in the EU and Ukraine: Regulatory and Management(IAEME Publication, 2020) Onyshchuk, Svitlana V.; Onyshchuk, Igor I.; Siryk, Zinoviy O.; Turenko, Vitali Ye.EN: The purpose of this article is to study the practice of administrative and territorial reform in the European Union in the context of the reform of the administrative and territorial structure in Ukraine in order to deepen the European integration processes and approach the legal standards of the EU countries. During the research, methods of interdisciplinary approach, system analysis, socio-cultural method, social-activity and concrete- historical approach were applied. The article concludes that based on the European experience, the author considers it important to warn domestic reformers that market principles in the public administration system have certain limits of application as a result of intensive implementation of market management principles and deconcentration of management, the public service may become more disjointed and less manageable, which will contribute to the distortion of its public purpose, distancing citizens from state institutions. In the course of the study, it was possible to identify some of the most important common causes of European reforms that affected the peculiarities of the process of reforming the administrative and territorial structure in these countries. Innovative principles and technologies of advanced administrative reforms gradually evolved from the "new state management" to the "good governance" model. the article highlights the formation of the European "framework model" of administrative and state reform. The article analyzes models of successful administrative and territorial reform in a number of advanced European countries.Item Preservation of Macro Fractographic Signs of the Plane of Fracture of the Details for Expert Engineering Research(Technical University, Academic Publishing House, Sofia, 2019) Batig, Andriy V.; Hrytsyshyn, Petro; Kovalchuk, O.; Kuzyshyn, Andrii Ya.; Dovhaniuk, Stepan S.; Sobolevska, Yuliia H.EN: Estimates of operational reliability and durability of machine parts and mechanisms cannot be carried out without technical diagnostics of the presence or absence of fatigue cracks, which are the cause of destruction. In some cases, the object of investigation, which is a material proof in the execution of expert engineering studies, may be accidentally or deliberately damaged or destroyed. This leads to the loss of specific signs of the presence of fatigue cracks and the inability to identify patterns that led to their appearance. Ultimately, this affects the reliability of the results. For example, such circumstances in the future significantly complicate the identification of the true causes of accidents and disasters on the railway. Preserving the plane of fracture of the object of research at the scene of the incident and in the process of its transportation to a research institution is an important factor in increasing the reliability of expert engineering and technical opinion taking into account the requirements of the European Union technical specifications (TSI).Item Procedure for Determining the Thermoelastic State of a Reinforced Concrete Bridge Beam Strengthened with Methyl Methacrylate(РС Тесhnology Сеntеr, Kharkiv, Ukraine, 2021) Kovalchuk, Vitalii V.; Sobolevska, Yuliia H.; Onyshchenko, Artur; Fedorenko, Olexander; Tokin, Oleksndr; Pavliv, Andrii; Kravets, Ivan B.; Lesiv, JuliaENG: This paper reports the analysis of methods for determining temperature stresses and deformations in bridge structures under the influence of climatic temperature changes in the environment. A one-dimensional model has been applied to determine the temperature field and thermoelastic state in order to practically estimate the temperature fields and stresses of strengthened beams taking into consideration temperature changes in the environment. The temperature field distribution has been determined in the vertical direction of a reinforced concrete beam depending on the thickness of the structural reinforcement with methyl methacrylate. It was established that there is a change in the temperature gradient in a contact between the reinforced concrete beam and reinforcement. The distribution of temperature stresses in the vertical direction of a strengthened reinforced concrete beam has been defined, taking into consideration the thickness of the reinforcement with methyl methacrylate and the value of its elasticity module. It was established that the thickness of the reinforcement does not have a significant impact on increasing stresses while increasing the elasticity module of the structural reinforcement leads to an increase in temperature stresses. The difference in the derived stress values for a beam with methyl methacrylate reinforcement with a thickness of 10 mm and 20 mm, at elasticity module E=15,000 MPa, is up to 3 % at positive and negative temperatures. It has been found that there is a change in the nature of the distribution of temperature stresses across the height of the beam at the contact surface of the reinforced concrete beam and methyl methacrylate reinforcement. The value of temperature stresses in the beam with methyl methacrylate reinforcement and exposed to the positive and negative ambient temperatures increases by three times. It was established that the value of temperature stresses is affected by a difference in the temperature of the reinforced concrete beam and reinforcement, as well as the physical and mechanical parameters of the investigated structural materials of the beam and the structural reinforcement with methyl methacrylate.Item Rayleigh Wave Diffraction on Surface Elastic Inclusion in the Half-Space(IEEE, 2020) Stankevych, Volodymyr Z.; Zhbadynskyi, I. Y.; Vdovychyn, I. Y.EN: The diffraction of the Rayleigh wave on a half-circular elastic inclusion which is located perpendicular to the half-space surface is considered. The low-frequency oscillations spectrum is analyzed. Using the method of boundary integral equations (BIE), the problem is reduced to the integral equations with respect to unknown defect opening functions. The mode-I stress intensity factors as functions of angular coordinate of an inclusion front point and wave number for various relations between the materials parameters are computed.Item Research of Safety Indicators of Diesel Train Movement with Two-Stage Spring Suspension(Technical University of Sofia, Bulgaria, 2018) Kuzyshyn, Andrii Ya.; Batig, Andriy V.; Kostritsa, Sergey A.; Sobolevska, Yuliia H.; Kovalchuk, Vitalii V.; Dovhaniuk, Stepan S.; Voznyak, Oleg M.EN: The problem of the interaction of rolling stock with the rail track has been analyzed in the present paper. It has been established that in the process of transport science development a number of methods for determining the causes of wheel pairs derailment are developed, which, in a varying degree, take into account the peculiarities of their interaction. The problem of choosing the most accurate method for estimating the causes of rolling stock derailment becomes more complicated because of the lack of sufficient experimental data that would allow us to verify the adequacy of the models. The indicators of stability of the wheel against derailment, which are used on the railways of Ukraine and Europe, have been examined. Their dependences on the speed of movement were derived. It has been established that the increase of the speed of motion leads to the increase of the interaction power of the rolling stock with the rail track, which may, under certain operational parameters, provoke its derailment. As a result of the calculations, it has been shown that the use of norms for car design and calculation used on Ukrainian railways can lead to an inadequate estimation of traffic safety parameters, since it does not take into account the unevenness of the railway track. It has been established that the requirements of BS EN 14363: 2005 European norms are stricter in comparison with the norms for calculation and evaluation of the bearing elements strength and dynamic qualities of motor-vehicle rolling stock used on Ukrainian railways. A comparison of the experimentally and theoretically calculated values of the stability margin coefficient against wheel derailment of the first wheel pair of the diesel train car was carried out.Item Research of the Impact of Geometric Unevenness of the Railway Track on the Dynamic Parameters of the Railway Rolling Stock With Two-Stage Spring Suspension(IOP Publishing, 2019) Kuzyshyn, Andrii Ya.; Kostritsa, Sergei A.; Ursulyak, Ludmila V.; Batig, Andriy V.; Sobolevska, Yuliia H.; Voznyak, Oleh M.EN: Abstract. The paper studies the possibility of using previously developed by the authors spatial mathematical model of the modern diesel train DPKr-2 for parameters determination, with the help of which the dynamic properties of the mechanical part are evaluated. The dependences of maximum accelerations of the body in the vertical and horizontal planes, the coefficients of vertical and horizontal dynamics both in the primary and in the secondary suspension on the speed of the car movement, the amplitude and the length of geometrical unevenness of the railway track were obtained. It is established at what speeds, depending on the parameters of geometrical unevenness of the railway track, the phenomenon of resonance and danger for the diesel train car movement appears. For a particular length of geometrical unevenness, the maximum permissible value of its amplitude over the entire range of speed movement, where the coefficients of vertical and horizontal dynamics in the primary suspension do not exceed permissible limits, has been studied. The adequacy of the mathematical model is checked by comparing the results obtained during calculations with the experimental ones.Item Study of the Dynamic Behavior of Rolling Stock using a Computer Experiment(IOP Publishing, 2020) Kuzyshyn, Andrii Ya.; Batig, Andriy V.; Kostritsa, Sergei A.; Sobolevska, Yuliia H.; Dovhaniuk, Stepan S.; Dzhus, Volodymyr S.EN: The authors of the article analyzed existing software systems that are used to study the dynamic behavior of rolling stock, and also emphasized the importance of using a computer experiment to implement this task. An improved spatial mathematical model of the dynamic behavior of a freight wagon when it interacts with a rail track is considered, and it is proposed to study it using an object-oriented approach using the Maple software package. To accomplish this task by writing procedures, separate modules (subprograms) were created that included differential equations of motion for the individual components of the object under study. Based on existing procedures, the main module was created, which reflected the sequence of performing certain functions (calling up the necessary information, especially the use of logic, methods for solving the problem, as well as visualizing the results). Using the created modules in the Maple software package, a computer experiment was used to study the dynamic behavior of a freight car when it interacted with a rail, and also showed the possibility of taking into account the influence of individual parameters of its technical condition on its dynamic behavior.Item Theoretical Study into Efficiency of the Improved Longitudinal Profile of Frogs at Railroad Switches(PC "Technology Center", Ukrainian State University of Railway Transport, Kharkov, 2018) Kovalchuk, Vitalii V.; Sysyn, Mykola P.; Sobolevska, Yuliia H.; Nabochenko, Olga S.; Parneta, Bohdan Z.; Pentsak, Andrii Ya.EN: We have developed a comprehensive method to prolong the time of operation of frogs at railroad switches, based on the consideration of a longitudinal profile of the frog, the magnitude of dynamic forces and normal stresses. We have improved a longitudinal profile of the frog, brand 1/11, project 1740, by the method of surfacing under field operation conditions. The slopes of a trajectory after the passage of an average statistical wheel over the proposed profile amount to 3.7 ‰ instead of 10 ‰ for a standard profile of the frog. It was established that increasing a load on the frog to 60 % at the expense of a deflection under the frog beam leads to the accelerated disarrangement of the frog, as a result of fatigue defects at the rolling surface, while the cost of frog operation in this case increases by five times. We modeled a dynamic interaction between the rolling stock and a standard, as well as the proposed, longitudinal profiles of frogs. Calculation of dynamic processes of the nonlinear interaction between the rolling stock and a standard profile of the frog and the profile restored by surfacing, showed that the magnitude of forces for the proposed frog at the motion speed of 150 km/h is 50 % lower compared with a standard longitudinal profile. At linear simulation of dynamic additions of forces, the magnitude of forces decreases for the proposed profile to 30 %. We employed a graphical method to calculate the magnitudes of axial inertia moments and the moments of resistance in the characteristic cross sections of the frog. The estimation of the stressed-strained state of the frog was performed using equations of five moments for a continuous beam on elastic point supports. It was established that stresses at the static calculation of the frog are low and are much less than the maximum permissible magnitude of stresses for a given grade of steel. Therefore, we can argue that the frog works under a load at the expense of existing reserve of strength.Item Ways to Improve the Mathematical Model of a Freight Car for the Execution of Forensic Railway-Transport Expertises(IOP Publishing Ltd, United Kingdom, 2020) Batig, Andriy V.; Kuzyshyn, Andriy; Sobolevska, Julia H.; Milyanych, Andriy R.; Hrytsyshyn, PetroEN: According to statistics, receipts of forensic railway-transport expertises related to the derailment of freight wagons annually grows. At the same time, an analysis of the available mathematical models of freight wagons for the study of such cases showed that at present they are not sufficiently detailed to the extent that it is necessary to analyze the causes of rolling stock derailment. Therefore, taking into account the main reasons that occurrence of such railway accidents over the last five years on the railways of Ukraine, the article selects the main directions for improving the mathematical model of a freight wagon. These directions, in turn, should cover the whole plural of factors (explicit and hidden) and identify the most significant ones regarding the circumstances of the derailment rolling stock off the track, established on the basis of a computer experiment. An algorithm and a mathematical model are proposed taken into account the influence on the dynamics of the wagon of process of closing gaps in the axle-boxes and slides, and the equations of motion of the wheelset are supplemented by a guiding force, whose value is one of the main indicators of the stability of the rolling stock.
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