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Research interest area: structural and parametric analysis and synthesis of transport engineering structures, as well as their functional and cost optimization (cost engineering). He is directly engaged in improving the technical, economic and operational indicators of the railway rolling stock in order to strengthen the position of Ukraine in the international markets of transportation and transport machine building, as well as to reduce the traffic handling cost.
This research deals with determination of the loading of an open container during operating modes. The special feature of this container is its convex walls. This engineering solution increases the useful capacity of a container by 8% in comparison to that of the prototype. The elastic elements in the bearing structure of a container were introduced to decrease the dynamic loads. The dynamic loads in the vertical plane were dumped by means of the dry friction forces between the components of the cross bearers of the container’s base. The dynamic loads in the longitudinal plane were dumped by means of the dry friction forces between the horizontal parts of fittings and fixed lashing components. This study presents the modelling of the dynamic loading of a container in a vertical plane. The dynamic loads of a container in the longitudinal plane were determined with a mathematical model. The authors determined the basic strength characteristics of the bearing structure of a container; and found that the maximum stresses to a container were about 200 MPa, concentrated near the front fittings. The maximum displacements were recorded in the cross bearers of the base and amounted to about 4 mm.
Oleksij Fomin; Juraj Gerlici; Glib Vatulia; Alyona Lovska; Kateryna Kravchenko. Determination of the Loading of a Flat Rack Container during Operating Modes. Applied Sciences 2021, 11, 7623 .
AMA StyleOleksij Fomin, Juraj Gerlici, Glib Vatulia, Alyona Lovska, Kateryna Kravchenko. Determination of the Loading of a Flat Rack Container during Operating Modes. Applied Sciences. 2021; 11 (16):7623.
Chicago/Turabian StyleOleksij Fomin; Juraj Gerlici; Glib Vatulia; Alyona Lovska; Kateryna Kravchenko. 2021. "Determination of the Loading of a Flat Rack Container during Operating Modes." Applied Sciences 11, no. 16: 7623.
This article presents the most frequent damage in the bearing structure of a rail car during rail/sea transportation. The study includes load modes for the bearing structure of an open car such as unloading with a grab and transportation by a train ferry. It was found that the most vulnerable element of the bearing structure of an open car during unloading with a grab is the top cord. The authors suggest applying a viscous material (an elastomer) to reinforce the top cord. This solution was confirmed by means of a strength calculation, whose results showed the efficiency of the solution. The bearing structure of an open car during the train ferry transportation can be protected by mounting special fixation units on the bolster beams. The geometry of such units was chosen according to that of a chain binder. The results of the strength calculation demonstrated that the strength of the bearing structure of an open car was provided with the application of the fixation units suggested. The article also presents the results of the experimental determination of the strength of the improved bearing structure of an open car based on the finite element method and full-scale bench testing. The research conducted might be used by those who are interested in higher operational efficiency of rail cars during rail/sea transportation.
Oleksij Fomin; Alyona Lovska; Pavel Kučera; Václav Píštěk. Substantiation of Improvements for the Bearing Structure of an Open Car to Provide a Higher Security during Rail/Sea Transportation. Journal of Marine Science and Engineering 2021, 9, 873 .
AMA StyleOleksij Fomin, Alyona Lovska, Pavel Kučera, Václav Píštěk. Substantiation of Improvements for the Bearing Structure of an Open Car to Provide a Higher Security during Rail/Sea Transportation. Journal of Marine Science and Engineering. 2021; 9 (8):873.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Pavel Kučera; Václav Píštěk. 2021. "Substantiation of Improvements for the Bearing Structure of an Open Car to Provide a Higher Security during Rail/Sea Transportation." Journal of Marine Science and Engineering 9, no. 8: 873.
An articulated covered wagon design was developed. The wagon feature is that the body-bearing elements are made of circular pipes. This technical solution made it possible to reduce the tare weight of the wagon while ensuring the strength conditions. Mathematical simulation of the dynamic loading of the developed articulated covered wagon design was carried out under the main operating conditions. In the calculations of the observed quantities, an application of symmetry with regard to the longitudinal axis of the wagon was used. The accelerations, as the components of the dynamic load acting on the wagon, were determined. The dynamic loading computer simulation results of the developed wagon design are also presented. The strength analysis of the articulated covered wagon supporting structure made it possible to conclude that the strength indexes were within the allowed limits. The wagon bearing structure was analyzed for fatigue strength. The weld strength analysis results of the most loaded part of the wagon-bearing structure are presented. The results obtained for the desired quantities revealed their symmetrical distribution in the wagon structure. This research will contribute to improving the efficiency of railway transport operation.
Oleksij Fomin; Alyona Lovska; Juraj Gerlici; Yuliia Fomina; Ján Dižo; Miroslav Blatnický. The Dynamic and Strength Analysis of an Articulated Covered Wagon with the Circular Pipe Design. Symmetry 2021, 13, 1398 .
AMA StyleOleksij Fomin, Alyona Lovska, Juraj Gerlici, Yuliia Fomina, Ján Dižo, Miroslav Blatnický. The Dynamic and Strength Analysis of an Articulated Covered Wagon with the Circular Pipe Design. Symmetry. 2021; 13 (8):1398.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Juraj Gerlici; Yuliia Fomina; Ján Dižo; Miroslav Blatnický. 2021. "The Dynamic and Strength Analysis of an Articulated Covered Wagon with the Circular Pipe Design." Symmetry 13, no. 8: 1398.
This paper substantiates the use of Y25 bogies under tank cars in order to prolong their service life. The reported study has been carried out for a tank car with rated parameters, as well as the actual ones, registered during full-scale research. Mathematical modeling was performed to determine the basic indicators of the tank car dynamics. The differential equations of motion were solved by a Runge-Kutta method using the Mathcad software package (USA). It was established that the use of Y25 bogies under a tank car with rated parameters could reduce the acceleration of its bearing structure by almost 39 % compared to the use of standard 18‒100 bogies. Applying the Y25 bogies under a tank car with the actual parameters reduces the acceleration of its load-bearing structure by almost 50 % compared to the use of standard 18‒100 bogies. The derived acceleration values were taken into consideration when calculating the bearing structure of a tank car for strength. The calculation was performed using the SolidWorks Simulation software package (France). The resulting stress values are 18 % lower than the stresses acting on the load-bearing structure of a tank car equipped with 18‒100 bogies. For the load-bearing structure of a tank car with the actual parameters, the maximum equivalent stresses are 16 % lower than the stresses when the 18‒100 bogies are used. The design service life of the load-bearing structure of a tank car was estimated taking into consideration the use of Y25 bogies. The calculations showed that the design service life of the bearing structure of a tank car equipped with Y25 bogies is more than twice as high as that obtained for 18‒100 bogies. The study reported here would contribute to compiling recommendations for prolonging the service life of the load-bearing structures of tank cars
Oleksij Fomin; Alyona Lovska; Kseniia Ivanchenko; Ievgen Medvediev. Justifying the prolongation of the service life of the bearing structure of a tank car when using Y25 bogies. Eastern-European Journal of Enterprise Technologies 2021, 3, 6 -14.
AMA StyleOleksij Fomin, Alyona Lovska, Kseniia Ivanchenko, Ievgen Medvediev. Justifying the prolongation of the service life of the bearing structure of a tank car when using Y25 bogies. Eastern-European Journal of Enterprise Technologies. 2021; 3 (7 (111)):6-14.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Kseniia Ivanchenko; Ievgen Medvediev. 2021. "Justifying the prolongation of the service life of the bearing structure of a tank car when using Y25 bogies." Eastern-European Journal of Enterprise Technologies 3, no. 7 (111): 6-14.
The research is concerned with the use of double walls filled with aluminium foam for an open wagon in order to decrease the dynamic stresses during the operational modes. The research presents the strength calculation for the bearing structure of an open wagon with consideration of the engineering solutions proposed. It was found that the maximum equivalent stresses appeared in the bottom section of the centre sill behind the back support; they amounted to about 315 MPa and did not exceed the allowable values. The maximum displacements were detected in the middle section of the centre sill and amounted to 9.6 mm. The maximum deformations were 1.17 × 10−2. The research also presents the strength calculation for a weld joint in the maximum loaded zones of the bearing structure of an open wagon and gives the results of a modal analysis of the bearing structure of the improved open wagon. It was found that the critical oscillation frequencies did not exceed the allowable values. The results of the research may be useful for those who are concerned about designing innovative rolling stock units and improving the operational efficiency of railway transport.
Oleksij Fomin; Mykola Gorbunov; Juraj Gerlici; Glib Vatulia; Alyona Lovska; Kateryna Kravchenko. Research into the Strength of an Open Wagon with Double Sidewalls Filled with Aluminium Foam. Materials 2021, 14, 3420 .
AMA StyleOleksij Fomin, Mykola Gorbunov, Juraj Gerlici, Glib Vatulia, Alyona Lovska, Kateryna Kravchenko. Research into the Strength of an Open Wagon with Double Sidewalls Filled with Aluminium Foam. Materials. 2021; 14 (12):3420.
Chicago/Turabian StyleOleksij Fomin; Mykola Gorbunov; Juraj Gerlici; Glib Vatulia; Alyona Lovska; Kateryna Kravchenko. 2021. "Research into the Strength of an Open Wagon with Double Sidewalls Filled with Aluminium Foam." Materials 14, no. 12: 3420.
This research is concerned with the use of double walls filled with foam aluminum for an open wagon to decrease loading during operational modes. The research presents the strength calculation for the frame of a wagon with a consideration of the engineering solutions proposed. It was found that the maximum equivalent stresses appeared in the bottom section of the center sill behind the back support; they amounted to about 290 MPa and did not exceed the allowable values. The maximum displacements were in the middle parts of the main longitudinal beams of a section, and they amounted to 8.8 mm. The research also presents the strength calculation for a weld joint in the maximum loaded zones of the frame of a wagon and reports the results of the modal analysis of the frame of the improved wagon. It was found that the oscillation frequencies did not exceed the allowable values. The results of the research may be useful for those who are concerned about designing innovative rolling stock units and improving the operational efficiency of railway transport.
Oleksij Fomin; Juraj Gerlici; Alyona Lovska; Kateryna Kravchenko. Analysis of the Loading on an Articulated Flat Wagon of Circular Pipes Loaded with Tank Containers. Applied Sciences 2021, 11, 5510 .
AMA StyleOleksij Fomin, Juraj Gerlici, Alyona Lovska, Kateryna Kravchenko. Analysis of the Loading on an Articulated Flat Wagon of Circular Pipes Loaded with Tank Containers. Applied Sciences. 2021; 11 (12):5510.
Chicago/Turabian StyleOleksij Fomin; Juraj Gerlici; Alyona Lovska; Kateryna Kravchenko. 2021. "Analysis of the Loading on an Articulated Flat Wagon of Circular Pipes Loaded with Tank Containers." Applied Sciences 11, no. 12: 5510.
The determination of the dynamic loading of the bearing structures of the main types of freight wagons with the actual dimensions under the main operating conditions is carried out. The inertial coefficients of the bearing structures of the wagons are determined by constructing their spatial models in the SolidWorks software package. Two cases of loading of the bearing structures of the wagons – in the vertical and longitudinal planes – have been taken into account. The studies were carried out in a flat coordinate system. When modeling the vertical loading of the bearing structures of wagons, it was taken into account that they move in the empty state with butt unevenness of the elastic-viscous track. The bearing structures of the wagons are supported by bogies of models 18-100. The solution of differential equations of motion was carried out by the Runge-Kutta method in the MathCad software package. When determining the longitudinal loading of the bearing structures of wagons, the calculation was made for the case of a shunting collision of wagons or a "jerk" (tank wagon). The accelerations acting on the bearing structures of the wagons are determined. The research results will help to determine the possibility of extending the operation of the bearing structures of freight wagons that have exhausted their standard service life. It has been established that the indicators of the dynamics of the load-carrying structures of freight wagons with the actual dimensions of the structural elements are within the permissible limits. So, for a gondola wagon, the vertical acceleration of the bearing structure is 4.87 m/s2, for a covered wagon – 5.5 m/s2, for a flat wagon – 5.8 m/s2, for a tank wagon – 4.25 m/s2, for a hopper wagon – 4.5 m/s2. The longitudinal acceleration acting on the bearing structure of a gondola wagon is 38.25 m/s2, for a covered wagon – 38.6 m/s2, for a flat wagon – 38.9 m/s2, for a tank wagon – 27.4 m/s2, for a hopper wagon – 38.5 m/s2. This makes it possible to develop a conceptual framework for restoring the effective functioning of outdated freight wagons. The conducted research will be useful developments for clarifying the existing methods for extending the service life of the bearing structures of freight wagons that have exhausted their standard resource
Oleksij Fomin; Alyona Lovska. Determination of dynamic loading of bearing structures of freight wagons with actual dimensions. Eastern-European Journal of Enterprise Technologies 2021, 2, 6 -14.
AMA StyleOleksij Fomin, Alyona Lovska. Determination of dynamic loading of bearing structures of freight wagons with actual dimensions. Eastern-European Journal of Enterprise Technologies. 2021; 2 (7 (110)):6-14.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska. 2021. "Determination of dynamic loading of bearing structures of freight wagons with actual dimensions." Eastern-European Journal of Enterprise Technologies 2, no. 7 (110): 6-14.
The study deals with determination of the vertical load on the carrying structure of a flat wagon on the 18–100 and Y25 bogies using mathematic modelling. The study was made for an empty wagon passing over a joint irregularity. The authors calculated the carrying structure of a flat wagon with the designed parameters and the actual features recorded during field tests. The mathematical model was solved in MathCad software. The study found that application of the Y25 bogie for a flat wagon with the designed parameters can decrease the dynamic load by 41.1% in comparison to that with the 18–100 bogie. Therefore, application of the Y25 bogie under a flat wagon with the actual parameters allows decreasing the dynamic loading by 41.4% in comparison to that with the 18–100 bogie. The study also looks at the service life of the supporting structure of a flat wagon with the Y25 bogie, which can be more than twice as long as the 18–100 bogie. The research can be of interest for specialists concerned with improvements in the dynamic characteristics and the fatigue strength of freight cars, safe rail operation, freight security, and the results of the research can be used for development of innovative wagon structures.
Oleksij Fomin; Alyona Lovska; Václav Píštěk; Pavel Kučera. Determination of the Vertical Load on the Carrying Structure of a Flat Wagon with the 18–100 and Y25 Bogies. Applied Sciences 2021, 11, 4130 .
AMA StyleOleksij Fomin, Alyona Lovska, Václav Píštěk, Pavel Kučera. Determination of the Vertical Load on the Carrying Structure of a Flat Wagon with the 18–100 and Y25 Bogies. Applied Sciences. 2021; 11 (9):4130.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Václav Píštěk; Pavel Kučera. 2021. "Determination of the Vertical Load on the Carrying Structure of a Flat Wagon with the 18–100 and Y25 Bogies." Applied Sciences 11, no. 9: 4130.
The study deals with an application of aluminum foam as an energy-absorbing material for the carrying structure of a rail car. The material is particularly recommended for circular tube carrying structures. The authors conducted mathematical modeling of dynamic loads on the carrying structure of an open wagon that faces shunting impacts with consideration of the center sill filled with aluminum foam. It was established that the maximum accelerations on the carrying structure of an open wagon were 35.7 m/s2, which was 3.5% lower in comparison with those for a circular tube structure without a filler. The results obtained were proved by computer modeling. The strength of the carrying structure of an open wagon was also calculated. It was established that aluminum foam applied as a filler for the center sill decreased the maximum equivalent stresses in the carrying structure of an open wagon by about 5% and displacements by 12% in comparison with those involving the circular tube carrying structure of an open wagon without a filler. The natural frequencies and the oscillation modes of the carrying structure of an open wagon were defined. The designed models of the dynamic loading of the carrying structure of an open wagon were verified with an F-test.
Oleksij Fomin; Mykola Gorbunov; Alyona Lovska; Juraj Gerlici; Kateryna Kravchenko. Dynamics and Strength of Circular Tube Open Wagons with Aluminum Foam Filled Center Sills. Materials 2021, 14, 1915 .
AMA StyleOleksij Fomin, Mykola Gorbunov, Alyona Lovska, Juraj Gerlici, Kateryna Kravchenko. Dynamics and Strength of Circular Tube Open Wagons with Aluminum Foam Filled Center Sills. Materials. 2021; 14 (8):1915.
Chicago/Turabian StyleOleksij Fomin; Mykola Gorbunov; Alyona Lovska; Juraj Gerlici; Kateryna Kravchenko. 2021. "Dynamics and Strength of Circular Tube Open Wagons with Aluminum Foam Filled Center Sills." Materials 14, no. 8: 1915.
To increase the efficiency of using railway transport, the possibility of using new designs of bogies, for example, Y25 under "wide gauge" wagons was considered. In order to substantiate the proposed solution, mathematical modeling of the dynamic loading of the hopper wagon Y25 bogies was carried out. A hopper wagon for the transportation of pellets and hot sinter model 20-9749 built by the State Enterprise "Ukrspetsvagon" (Ukraine) was chosen as a prototype. The simulation results showed that the use of Y25 bogies for hopper wagons allows to reduce the acceleration of its load-bearing structure, in comparison with the use of conventional 18100 bogies, by 36 %. Other performance indicators are also significantly improved. The use of Y25 bogies for hopper wagons with actual parameters allows to reduce the acceleration of its load-bearing structure, in comparison with the use of conventional 18100 bogies, by 28 %. The determination of the main indicators of the strength of the bearing structure of the hopper wagon Y25 bogie was carried out. The calculation was carried out in the SolidWorks Simulation software package (CosmosWorks), (France), which implements the finite element method. The calculations showed that the maximum equivalent stresses in the load-bearing structure of a hopper wagon with nominal parameters are 17 % lower than the stress acting in the load-bearing structure of a wagon on bogies 18–100 V of the load-bearing structure of a hopper wagon with actual parameters, the maximum equivalent stresses are 12 % lower per voltage in the load-bearing structure on bogies 18100. The conducted research will help to reduce the load on the load-bearing structures of hopper wagons in operation, improve the dynamics and strength indicators, as well as their service life
Oleksij Fomin; Alyona Lovska; Dmytro Ivanchenko; Sergii Zinchenko; Václav Píštěk. STUDY OF LOADING OF THE LOAD-BEARING STRUCTURE OF HOPPER WAGONS ON Y25 BOGIES. EUREKA: Physics and Engineering 2021, 32 -41.
AMA StyleOleksij Fomin, Alyona Lovska, Dmytro Ivanchenko, Sergii Zinchenko, Václav Píštěk. STUDY OF LOADING OF THE LOAD-BEARING STRUCTURE OF HOPPER WAGONS ON Y25 BOGIES. EUREKA: Physics and Engineering. 2021; (2):32-41.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Dmytro Ivanchenko; Sergii Zinchenko; Václav Píštěk. 2021. "STUDY OF LOADING OF THE LOAD-BEARING STRUCTURE OF HOPPER WAGONS ON Y25 BOGIES." EUREKA: Physics and Engineering , no. 2: 32-41.
This article deals with the method of computer-aided studies of the results of tank container impact tests to confirm the ability of portable tanks and multi-element gas containers to withstand the impact in the longitudinal direction on a specially equipped test rig or using a railway flat car by impacting a flat car with a striking car, in compliance with the requirements of the UN Navigation Rules and Regulations. It is shown that the main assessed characteristic of the UN requirements is the spectrum of the shock response (accelerations) for the interval natural frequencies of the shock pulse. The calculation of the points of the shock response spectrum curve based on the test results is reproduced in four stages. A test configuration of the impact testing of the railway flat car with a tank container is presented, and the impact is performed in such a way that, under a single impact, the shock spectrum curve obtained during the tests for both fittings subjected to impact repeats or exceeds the minimum shock spectrum curve for all frequencies in the range of 2 Hz to 100 Hz. Formulas for determining the relative displacements and accelerations for the interval natural frequencies of the shock wave are given. The research results are presented in graphical form, indicating that the experimental values of the shock response spectrum exceed the minimum permissible values; the equation of the experimental curve of the shock response spectrum in the frequency range 0–100 Hz is described by power-law dependence. The coefficients of the equation were determined by the statistical method of maximum likelihood with the determination factor being 0.897, which is a satisfactory value; a comparative analysis showed that the experimental curve of the impact response spectrum in the frequency range 0–100 Hz exceeds the normalized curve, which confirms compliance with regulatory requirements. A new test configuration is proposed using a tank car with a bulk liquid, the processes in which upon impact differ significantly from other freight wagons under longitudinal impact loads of the tank container. The hydraulic impact resulting from the impact on the tank container and the platform creates an overturning moment that causes the rear fittings to be unloaded.
Andrii Sulym; Pavlo Khozia; Eduard Tretiak; Václav Píštěk; Oleksij Fomin; Pavel Kučera. Aspects of Strength Testing of Tank Containers in Compliance with the Requirements of the UN Navigation Rules and Regulations. Journal of Marine Science and Engineering 2021, 9, 349 .
AMA StyleAndrii Sulym, Pavlo Khozia, Eduard Tretiak, Václav Píštěk, Oleksij Fomin, Pavel Kučera. Aspects of Strength Testing of Tank Containers in Compliance with the Requirements of the UN Navigation Rules and Regulations. Journal of Marine Science and Engineering. 2021; 9 (3):349.
Chicago/Turabian StyleAndrii Sulym; Pavlo Khozia; Eduard Tretiak; Václav Píštěk; Oleksij Fomin; Pavel Kučera. 2021. "Aspects of Strength Testing of Tank Containers in Compliance with the Requirements of the UN Navigation Rules and Regulations." Journal of Marine Science and Engineering 9, no. 3: 349.
The article presents the acoustic method of marine low-speed engine turbocharger parameter estimation under operating conditions when a prompt assessment of instantaneous turbocharger speed and rotor vibration level is required. The method lies in the analysis of the acoustic signal that is generated by the compressor of the turbocharger with the diesel engine running under load. The spectral analysis reveals that the compressor blades generate acoustic oscillations that are always present in the overall acoustic spectrum of the turbocharger regardless of its technical condition. The harmonic components corresponding to the blades can be detected in the spectrum using the limit method. The calculated instantaneous turbocharger speed makes it possible to analyze the main harmonic amplitude in the spectrum. The method presented in this paper helps eliminate discrete Fourier transform (DFT) spectral leakage so that the amplitude of the main harmonic can be estimated. Further analysis of the amplitude of the main harmonic allows for efficient estimation of the turbocharger rotor vibration level when in operation. The method can be practically applied by means of a smartphone or a computer that has the dedicated software installed. The proposed method lays the foundations for a permanent monitoring system of turbocharger speed and vibration in industrial and marine diesel engines.
Roman Varbanets; Oleksij Fomin; Václav Píštěk; Valentyn Klymenko; Dmytro Minchev; Alexander Khrulev; Vitalii Zalozh; Pavel Kučera. Acoustic Method for Estimation of Marine Low-Speed Engine Turbocharger Parameters. Journal of Marine Science and Engineering 2021, 9, 321 .
AMA StyleRoman Varbanets, Oleksij Fomin, Václav Píštěk, Valentyn Klymenko, Dmytro Minchev, Alexander Khrulev, Vitalii Zalozh, Pavel Kučera. Acoustic Method for Estimation of Marine Low-Speed Engine Turbocharger Parameters. Journal of Marine Science and Engineering. 2021; 9 (3):321.
Chicago/Turabian StyleRoman Varbanets; Oleksij Fomin; Václav Píštěk; Valentyn Klymenko; Dmytro Minchev; Alexander Khrulev; Vitalii Zalozh; Pavel Kučera. 2021. "Acoustic Method for Estimation of Marine Low-Speed Engine Turbocharger Parameters." Journal of Marine Science and Engineering 9, no. 3: 321.
The object of research is the supporting structure of the pellet wagon with the actual dimensions of the supporting elements. One of the most problematic areas is the determination of the indicators of dynamics and strength of the supporting structure of the hopper wagon with the actual dimensions of the structural elements. A study of the dynamic loading of the supporting structure of the hopper wagon was carried out. At the same time, the actual dimensions of the structural elements were determined by means of field studies. Mathematical modeling of the dynamic loading of the load-carrying structure of a hopper wagon with the actual dimensions of structural elements was carried out by means of mathematical modeling. The studies were carried out in a flat coordinate system. The presence of three degrees of freedom of the supporting structure of the hopper wagon was taken into account: vibrations of twitching, bouncing and galloping. Differential equations were solved in the MathCad software package. In doing so, they were reduced to the Cauchy normal form, and then integrated using the Runge-Kutta method. It was found that the maximum value of the acceleration acting on the supporting structure of the hopper wagon is 38.5 m/s2, which is 2.7% higher than the acceleration of the supporting structure with nominal dimensions. Computer simulation of the dynamic loading of the supporting structure of the hopper wagon was carried out. The calculation was carried out using the finite element method in the SolidWorks Simulation (CosmosWorks) software package. It was found that the maximum accelerations are concentrated in the middle part of the supporting structure of the hopper wagon and amount to 36.2 m/s2. The F-criterion was used to verify the developed model. The calculations showed that the calculated value of the criterion is Fc = 1.09 and is less than the table value Ft = 3.29. The adequacy hypothesis is not rejected. The natural frequencies and vibration modes of the hopper wagon supporting structure were determined. It has been established that the values of natural vibration frequencies of the hopper wagon bearing structure with the actual dimensions of the structural elements are within the permissible limits. The research will contribute to the creation of relevant developments to extend the service life of wagons that have exhausted their standard resource, as well as to increase the efficiency of railway transport operation.
Oleksij Fomin; Alyona Lovska; Pavel Skok; Ivan Rogovskii. Determination of the dynamic load of the carrying structure of the hopper wagon with the actual dimensions of structural elements. Technology audit and production reserves 2021, 1, 6 -11.
AMA StyleOleksij Fomin, Alyona Lovska, Pavel Skok, Ivan Rogovskii. Determination of the dynamic load of the carrying structure of the hopper wagon with the actual dimensions of structural elements. Technology audit and production reserves. 2021; 1 (1(57)):6-11.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Pavel Skok; Ivan Rogovskii. 2021. "Determination of the dynamic load of the carrying structure of the hopper wagon with the actual dimensions of structural elements." Technology audit and production reserves 1, no. 1(57): 6-11.
This paper reports a study into the dynamic loading and strength of an improved carrying structure of the platform car. A special feature of the car is the presence of elastic elements in the main longitudinal beams of the frame. This could improve the fatigue strength of the carrying structure of the platform car under operational modes. Mathematical modeling was carried out to determine the dynamic load on the carrying structure of the platform car. The fluctuations of bouncing were taken into consideration. It has been established that the vertical acceleration of the carrying structure of the platform car without cargo is about 2.0 m/s2 (0.2 g). In this case, the vertical accelerations that act on the carrying structure of the platform car are lower by 15 % as compared to the prototype wagon. The main indicators of strength of the bearing structure of the platform car have been determined. The calculation was carried out using a method of finite elements employing the software suite SolidWorks Simulation (France). When compiling the estimation scheme, it was taken into consideration that the carrying structure of the platform car was loaded with four containers the size of 1SS. In this case, the maximum equivalent stresses occur in the region of interaction between a pivot beam and spreads and are 254.0 MPa. That warrants the strength of the carrying structure of the platform car. The numerical values of acceleration of the carrying structure of the platform car have been determined, as well as the fields of their location, by applying computer simulation. The fatigue strength and oscillation eigenfrequencies in the carrying structure of the platform car have been investigated; their designed service time has been estimated. The reported research would contribute to building innovative structures of platform cars, as well as to improving the efficiency of combined transportation.
Sergii Panchenko; Oleksij Fomin; Glib Vatulia; Oleksander Ustenko; Alyona Lovska. Determining the load on the long-based structure of the platform car with elastic elements in longitudinal beams. Eastern-European Journal of Enterprise Technologies 2021, 1, 6 -13.
AMA StyleSergii Panchenko, Oleksij Fomin, Glib Vatulia, Oleksander Ustenko, Alyona Lovska. Determining the load on the long-based structure of the platform car with elastic elements in longitudinal beams. Eastern-European Journal of Enterprise Technologies. 2021; 1 (7 (109)):6-13.
Chicago/Turabian StyleSergii Panchenko; Oleksij Fomin; Glib Vatulia; Oleksander Ustenko; Alyona Lovska. 2021. "Determining the load on the long-based structure of the platform car with elastic elements in longitudinal beams." Eastern-European Journal of Enterprise Technologies 1, no. 7 (109): 6-13.
Purpose. This study is aimed at determining the vertical dynamics of supporting structures of freight cars made of round pipes. Methodology. Mathematical modeling of the dynamic loading of the supporting structures of the main types of freight cars made of round pipes (gondola car, covered car, flat car, hopper car) was carried out. The studies were carried out in a plane coordinate system – the XZ plane. At the same time, it was taken into account that the car is moving in an elastic-viscous track so that the reactions of the track are proportional to both its deformation and the rate of this deformation. The studies were carried out for the case of empty cars. The joint inequality is described by a periodic function. The calculation was performed at a speed of 80 km/h. Differential equations of motion were solved in the MathCad software package using the Runge-Kutta method. Findings. Based on the mathematical modeling of the dynamic loading of the supporting structures of cars made of round pipes, the main indicators of their dynamics were obtained: accelerations acting on the supporting structures in the mass center, forces acting in the spring suspension of bogies, dynamics coefficients. For gondola car, covered car, and hopper car, the acceleration at the mass center of the supporting structure is within 0.4 g, and for a flat car – 0.5 g. It was found that the obtained indicators of the dynamics of cars made of round pipes are within the permissible limits. The accelerations acting on the supporting structures of cars made of round pipes are almost the same as those obtained for prototype cars. At the same time, the motion of cars is assessed as "excellent" for gondola car, covered car, and hopper car and "good" for flat car. Originality. Mathematical modeling of the dynamic loading of the supporting structures of cars from round pipes was carried out and the main indicators of their dynamics were obtained. Practical value. The research carried out will contribute to the creation of recommendations for the design of supporting structures of freight cars of round pipes, and can also be useful developments in the creation of innovative car designs.
O. V. Fomin; A. O. Lovska. Research of the Vertical Dynamics of the Supporting Structures of Freight Cars Made of Round Pipes. Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport 2021, 104 -114.
AMA StyleO. V. Fomin, A. O. Lovska. Research of the Vertical Dynamics of the Supporting Structures of Freight Cars Made of Round Pipes. Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport. 2021; (1(91)):104-114.
Chicago/Turabian StyleO. V. Fomin; A. O. Lovska. 2021. "Research of the Vertical Dynamics of the Supporting Structures of Freight Cars Made of Round Pipes." Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport , no. 1(91): 104-114.
O. V. Fomin; State University of Infrastructure and Technology; D. A. Turovets; The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia". Modernization of braking equipment of electric trains with introduction of the system of the prevention of arbitrary rolling of cars from a place. Scientific news of Dahl university 2021, 1 .
AMA StyleO. V. Fomin, State University of Infrastructure and Technology, D. A. Turovets, The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia". Modernization of braking equipment of electric trains with introduction of the system of the prevention of arbitrary rolling of cars from a place. Scientific news of Dahl university. 2021; ():1.
Chicago/Turabian StyleO. V. Fomin; State University of Infrastructure and Technology; D. A. Turovets; The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia". 2021. "Modernization of braking equipment of electric trains with introduction of the system of the prevention of arbitrary rolling of cars from a place." Scientific news of Dahl university , no. : 1.
O. V. Fomin; State University of Infrastructure and Technology; P. M. Prokopenko; M. I. Gorbunov; S. V. Kara; Vladimir Dahl East Ukrainian National University; The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia"; Panyutyn Wagon Repair Plant Branch Of Ukrzaliznytsia Jsc. Investigation of indicators of dynamics of empty lightweight wagon taking into account operational indicators. Scientific news of Dahl university 2021, 1 .
AMA StyleO. V. Fomin, State University of Infrastructure and Technology, P. M. Prokopenko, M. I. Gorbunov, S. V. Kara, Vladimir Dahl East Ukrainian National University, The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia", Panyutyn Wagon Repair Plant Branch Of Ukrzaliznytsia Jsc. Investigation of indicators of dynamics of empty lightweight wagon taking into account operational indicators. Scientific news of Dahl university. 2021; ():1.
Chicago/Turabian StyleO. V. Fomin; State University of Infrastructure and Technology; P. M. Prokopenko; M. I. Gorbunov; S. V. Kara; Vladimir Dahl East Ukrainian National University; The Rail Transport Scientific and Engineering Institute branch of JSC "Ukrzaliznytsia"; Panyutyn Wagon Repair Plant Branch Of Ukrzaliznytsia Jsc. 2021. "Investigation of indicators of dynamics of empty lightweight wagon taking into account operational indicators." Scientific news of Dahl university , no. : 1.
To increase the efficiency of combined transportation, the supporting structure of flat wagon has been created. A feature of the wagon is that the sections have a low center of gravity. This solution allows for the transportation of oversized cargo on a flat wagon within the established dimensions. The design of this flat wagon can be used for the carriage of goods not only by main lines, but also in rail and water traffic when transported by rail ferries. To ensure the safety of transportation of a flat wagon with containers on a railway ferry, their dynamic loading was determined. It is taken into account that a large-capacity container of 1AA standard size is placed on each section. The solution of the mathematical model was carried out in the MathCad software package. The resulting accelerations, as components of the dynamic load, were taken into account when determining the stability of a container on a flat wagon during transportation by a rail ferry. It was found that the stability of the container is ensured at tilt angles up to 25°. A computer simulation of the dynamic loading of the supporting structure of an articulated flat wagon with containers during transportation by a railway ferry has been carried out. The calculation is implemented in the CosmosWorks software package using the finite element method. The fields of distribution of accelerations relative to the supporting structure of the flat wagon and containers are determined. The maximum percentage of discrepancy between the results of mathematical and computer simulation does not exceed 11 %. The research carried out will contribute to the creation of innovative designs of flat wagons, as well as to increase the efficiency of the operation of combined transport in international traffic
Oleksij Fomin; Alyona Lovska; Oleksandr Safronov; Olena Soroka. STUDY OF THE DYNAMIC LOADING OF THE LOAD-BEARING STRUCTURE OF A FLAT WAGON DURING TRANSPORTATION BY SEA. EUREKA: Physics and Engineering 2020, 41 -49.
AMA StyleOleksij Fomin, Alyona Lovska, Oleksandr Safronov, Olena Soroka. STUDY OF THE DYNAMIC LOADING OF THE LOAD-BEARING STRUCTURE OF A FLAT WAGON DURING TRANSPORTATION BY SEA. EUREKA: Physics and Engineering. 2020; (6):41-49.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Oleksandr Safronov; Olena Soroka. 2020. "STUDY OF THE DYNAMIC LOADING OF THE LOAD-BEARING STRUCTURE OF A FLAT WAGON DURING TRANSPORTATION BY SEA." EUREKA: Physics and Engineering , no. 6: 41-49.
A rapid development of economic relations between states has required an introduction of combined rail/ferry transportation. A feature of this type of transportation is the possibility of wagons traveling by sea on specially equipped ships—railway ferries. However, the transportation of wagons by sea is accompanied by damage to their structures. This follows from the fact that the wagons are not adapted to this type of transportation. In addition, the design of wagons does not consider the loads that can act on them during transportation by sea. In this connection, it is important to study the dynamic loading and strength of wagons during their transportation by sea. The current work investigated into dynamic load on the carrying structure of wagons transported by ferries using mathematical and computer modelling and defined accelerations on the wagon body. The adequacy of the models was checked with an F-test. The results of strength calculation for the carrying structure of a wagon made it possible to conclude that a typical fixation diagram does not provide the admissible range of strength parameters. The current work proposed an improved fixation diagram for cars on the deck with the viscous binder. The solution was substantiated by the results of the mathematical modelling of dynamic forces, strength, and stability of the carrying structure of a wagon on the deck. The results of the work will contribute to the creation of recommendations for the transportation of wagons on ferries. The research can contribute to safe transportation of wagons by ferries, and higher efficiency of the combined transportation
Alyona Lovska; Oleksij Fomin; Václav Píštěk; Pavel Kučera. Dynamic Load and Strength Determination of Carrying Structure of Wagons Transported by Ferries. Journal of Marine Science and Engineering 2020, 8, 902 .
AMA StyleAlyona Lovska, Oleksij Fomin, Václav Píštěk, Pavel Kučera. Dynamic Load and Strength Determination of Carrying Structure of Wagons Transported by Ferries. Journal of Marine Science and Engineering. 2020; 8 (11):902.
Chicago/Turabian StyleAlyona Lovska; Oleksij Fomin; Václav Píštěk; Pavel Kučera. 2020. "Dynamic Load and Strength Determination of Carrying Structure of Wagons Transported by Ferries." Journal of Marine Science and Engineering 8, no. 11: 902.
To reduce the dynamic loading and prolong the service life of a semi-wagon's girder beam by improving its fatigue strength, it has been proposed to improve its design. A special feature of the girder beam is that its middle part (the distance between the rear supports of auto-couplings) consists of a U-shaped profile, covered with a horizontal sheet above which an I-beam is located. Elastic elements are placed between the horizontal part of the U-shaped profile's shelf and the sheet. Mathematical modeling was performed to substantiate the proposed technical solution. A mathematical model has been constructed describing the fluctuations of the bouncing wagon. It has been established that the maximum vertical acceleration of the body is about 1.8 m/s2 (0.18 g), and of the bogie ‒ about 9.0 m/s2 (0.9 g). Based on our calculations, we can conclude that a wagon's movement is assessed as "excellent". In this case, the use of the girder beam with elastic links makes it possible to reduce the dynamic load on a wagon, in comparison with the prototype, by almost 35 %.The main indicators of the strength of the improved load-bearing structure of a wagon have been determined. The maximum equivalent strains occur, in this case, in the upper horizontal sheet of the girder beam, and are 136.0 MPa, which are lower, by 20 %, than those of the prototype wagon. The results of the modal analysis of the load-bearing structure of a semi-wagon taking into consideration the improvement measures have demonstrated that their natural frequencies of oscillations are within the permissible limits.Our research could help reduce the dynamic loading on the load-bearing structures of wagons in operation, as well as design the innovative structures of rolling stock
Oleksij Fomin; Alyona Lovska; Ievgen Medvediev; Halyna Shatkovska. Establishing patterns in the dynamic loading on the body of a semiwagon with an elastic middle part of the girder beam. Eastern-European Journal of Enterprise Technologies 2020, 5, 30 -37.
AMA StyleOleksij Fomin, Alyona Lovska, Ievgen Medvediev, Halyna Shatkovska. Establishing patterns in the dynamic loading on the body of a semiwagon with an elastic middle part of the girder beam. Eastern-European Journal of Enterprise Technologies. 2020; 5 (7 (107)):30-37.
Chicago/Turabian StyleOleksij Fomin; Alyona Lovska; Ievgen Medvediev; Halyna Shatkovska. 2020. "Establishing patterns in the dynamic loading on the body of a semiwagon with an elastic middle part of the girder beam." Eastern-European Journal of Enterprise Technologies 5, no. 7 (107): 30-37.