DSpace :: Browsing by Author "Lovska, A."

Browsing by Author "Lovska, A."

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A New Fastener To Ensure The Reliability Of A Passenger Car Body On A Train Ferry.
(2020) Lovska, A.; Fomin, O.
To ensure the strength of the passenger car bodies during transportation on train ferries, it is proposed to mount fastening elements of chain binders on the body bolster beams. The principle of such an element is based on the hydraulic damper operation. The mathematic modelling was conducted in order to determine the dynamic loading on a passenger car body during sea transportation. The study established that the improvements mentioned made it possible to reduce the dynamic loading on the body during sea transportation by 30% in a comparison with that of a typical fastening scheme. The strength of an improved passenger car body was calculated. The maximum equivalent stresses in the body structure accounted for about 120MPa, i.e., they did not exceed the admissible values. The conducted research may contribute to ensuring the required strength of passenger car bodies during train ferry transportation, thus leading to a higher operational efficiency of train ferry transportation within the international transportation.
Analysis of dynamic loading of improved construction of a tank container under operational load modes.
(2019) Fomin, O. V.; Lovska, A.; Gorobchenko, O.; Turpak, S.; Kyrychenko, I.; Burlutski, O.
An increase in the volume of bulk cargo transportation through international transport corridors necessitates the commissioning of tank containers. Intermodalization of a tank container predetermines its load in various operating conditions depending on the type of vehicle on which it is carried: aviation, sea, air or rail. The analysis of the operating conditions of tank containers, as well as the regulatory documents governing their workload, led to the conclusion that the most dynamic loads acting on the supporting structures during transportation by rail. Namely, during the maneuvering collision of a wagon-platform, on which there are tank containers. In this case, it is stipulated that for a loaded tank container, the dynamic load is assumed to be 4g, and for an empty (for the purpose of checking the reinforcement) – 5g. It is important to note that when the tank container is underfilled with bulk cargo and taking into account movements of fittings relative to fittings, the maximum value of dynamic load can reach significantly larger values. Therefore, in order to ensure the strength of tank containers, an improvement of their structures has been proposed by introducing elastic-viscous bonds into the fittings. To determine the dynamic loading of the tank container, taking into account the improvement measures, mathematical models have been compiled, taking into account the presence of elastic, viscous and elastic-viscous bonds between the fittings, stops and fittings. It is established that the elastic bond does not fully compensate for the dynamic loads acting on the tank container. The results of mathematical modeling of dynamic loading, taking into account the presence of viscous and elastic-viscous coupling in the fittings, made it possible to conclude that the maximum accelerations per tank container do not exceed the normalized values. The determination of the dynamic loading of the tank container is also carried out by computer simulation using the finite element method. The calculation takes place in the software package CosmosWorks. The maximum values of accelerations are obtained, as well as their distribution fields relative to the supporting structure of the tank container. The developed models are verified by the Fisher criterion. The research will contribute to the creation of tank containers with improved technical, operational, as well as environmental characteristics and an increase in the efficiency of the liquid cargo transportation process through international transport corridors.
Concept of freight wagons made of round pipes.
(2020) Fomin, O.; Lovska, A.
The purpose of the book is to highlight the results and features of the research carried out by the authors on the dynamics and strength of the main types of freight wagons, as well as tank containers made of round pipes under the main operating conditions of loading. Theoretical provisions, methodological foundations and practical solutions for the implementation of round pipes as bearing elements of bodies of the main types of wagons and tank containers are presented. The monograph is intended for scientific and technical specialists, whose activities are related to the design and research of the mechanics of structures of railway wagons, including scientists, designers, researchers, doctoral students and graduate students. Also, the results presented in the monograph may be of interest to specialists, whose activities are related to the design of tank containers. The monograph can be used as a teaching aid for undergraduates and bachelors of relevant specialties
Defining patterns in the longitudinal load on a train equipped with the new conceptual couplers.
(2020) Fomin, O.; Lovska, A.; Kovtun, O.; Nerubatskyi, V.
Determination of residual resource of flat wagons load-bearing structures with a 25-year service life.
(2020) Fomin, O.; Vatulia, G.; Horbunov, M.; Lovska, A.; Píštěk, V.; Kučera P.
The article determines the residual resource of flat wagons load-bearing structures with a 25-year service life. For this purpose, field studies of the technical condition of the loadbearing structures of flat wagons based on the wagon depot of the Foundation of the Southern Railway branch of JSC “Ukrzaliznytsia” were carried out. The flat wagon of model 13-401 was chosen as the subject. It is established that the design service life of the load-bearing structures of the studied flat wagons, taking into account the extension of their operation is not less than 18 years. The strength of the load-bearing structure of the flat wagon in the environment of SolidWorks Simulation (CosmosWorks) software by the finite element method is calculated. It is established that the maximum equivalent stresses occur in the zone of interaction of the spine beam with the pivot be equal to 337.5 MPa. Therefore, the strength of the load-bearing structure of the flat wagons is provided. The estimation of the course of the flat wagons is determined. The research was carried out in the vertical plane during the movement of the butt rail track. The calculation was performed in the MathCad software environment by the Runge- Kutta method. The assessment of the wagon is "excellent". The conducted researches will promote increase of efficiency of combined transportations in the international communication and strengthening of foreign economic positions of Ukraine in the market of transport services.
Determination of the regularities of the covered wagon supporting structure dynamic loading when conducting fire from it in the horizontal plane.
(2021) Fomin, O.; Lovska, A.; Gerlici, J.; Fomina, Yu.; Fedosov-Nikonov, D.; Prokopenko, P.
A study of the supporting structure dynamic loading of a covered wagon for the military equipment transportation and for firing has been carried out. A mathematical model has been drawn for this purpose, taking into account the vertical and angular displacements relative to the longitudinal axis (side rolling) of the wagon supporting structure when firing. Accelerations as the components of the dynamic load acting on the wagon supporting structure have been determined. It was found that the accelerations acting on the wagon supporting structure in the vertical plane were about 6.0 m/s2 (0.6 g). In the horizontal plane, the accelerations were 2.6 m/s2 (0.26 g). That is, the wagon movement can be assessed as “satisfactory”. To reduce the wagon dynamic loading during the conduct of fire, it is proposed to install elastic vibration dampers under the support sectors. In this case, the horizontal acceleration was about 2 m/s2 (0.2 g). Taking into account the proposed technical solutions, the wagon dynamic load is reduced by about 25% in comparison with the case of the rigid interaction of the sector with the frame. The strength analysis of the covered wagon bearing structure has been carried out. It was found that the maximum equivalent stresses are concentrated in the area of the front stops and are about 315 MPa. The conducted research will contribute to the creation of recommendations for the design of covered wagons for the military equipment transport and for firing, as well as to increase the efficiency of the railway transport operation..
Determining the dynamic loading and strength of the bearing structure of a covered wagon when firing from it.
(2020) Fomin, O.; Lovska, A.; Kudelya, V.; Smyrnova, I.
The bearing structure of a covered rail wagon has been improved to enable firing from it at motion. The covered wagon of model 11–217 was chosen as a prototype. To enable firing in the vertical plane, it has been proposed to use a sliding roof, which consists of shutters that move by means of a pneumatic or hydraulic drive. To accommodate military equipment inside the covered wagon, its frame is equipped with supporting sectors. Mathematical modeling was performed in order to determine the dynamic load on a covered rail wagon when firing from it. The mathematical model was solved in the Mathcad software package. We have established the dependence of the accelerations of the bearing structure of a covered rail wagon on the recoil force induced by the combat equipment that it hosts. It has been found that in order to maintain the dynamics indicators within acceptable limits, combat equipment should have a maximum recoil at a shot of about 3.2 kN. The maximum accelerations that act on the bearing structure of a covered wagon in a vertical plane are about 6 m/s2. In the zones of interaction between the body and bogies, the maximum accelerations are about 9.5 m/s2 and the accelerations of bogies are 10 m/s2. To reduce the dynamic load on the bearing structure of a covered rail wagon, it has been proposed to use a viscous connection between the supporting sectors and frame. We have determined the dependence of accelerations on the coefficient of viscous resistance between the supporting sectors and the bearing structure of a wagon. It has been established that taking into consideration the use of a viscous connection between the supporting sectors and frame makes it possible to reduce the dynamic load on a wagon at least by 15 %. The basic indicators of strength for the bearing structure of a covered rail wagon when firing from it have been determined. We have derived the dependence of the maximum equivalent stresses in the bearing structure of a covered wagon on the recoil force of combat equipment. The maximum equivalent stresses at a recoil force of 3.2 kN arise in the console part of the girder of a covered wagon and are about 300 MPa. The maximum displacements were registered in the area where the front stops of the auto-coupling are arranged; they are equal to 2.9 mm. The maximum deformations amounted to 6.98∙10-3. Modal analysis of the bearing structures of a covered rail wagon has been carried out. It has been determined that the values of the oscillation natural frequencies are within the permissible limits. Our study will contribute to the construction of innovative rolling stock for the transportation of military equipment and for firing at motion
Durability Determination of the Bearing Structure of an Open Freight Wagon Body Made of Round Pipes during its Transportation on the Railway Ferry.
(2019) Fomin, O. V.; Gerlici, J.; Lovska, A.; Kravchenko, K.; Prokopenko, P.; Fomina, A.; Hauser, V.
In order to reduce the cost of designing and manufacturing of the new-generation open wagons, it is proposed to construct their carrying systems from round pipes. In order to exploit the proposed designs of wagons in international rail-water communication, it is assumed that they will be equipped with assemblies for fastening of chain binders. The maximal values of accelerations, as components of dynamic load acting on open wagons, made from round pipes during their transportation on a railway ferry, are determined. It is established that when moving the body in the vertical direction for a wagon located on the upper deck, the maximum acceleration value is 0.84 g, with angular displacement relative to the transverse axis for the extreme from the anchor point of the wagon body - is 0.1 g, with angular displacement around the longitudinal axis for the extreme from the bulwark of the body of the wagon - is 0.24 g. The conducted researches will enable increased efficiency of operation of open wagons through international transport corridors.
Dynamic Load and Strength Determination of Carrying Structure of Wagons Transported by Ferries.
(2020) Lovska, A.; Fomin, O.; Píštěk, V.; Kučera, P.
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 e ciency of the combined transportation
Dynamic load effect on the transportation safety of tank containers as part of combined trains on railway ferries.
(2019) Fomin, O. V.; Lovska, A.; Píštěk, V.; Kučera, P.
Maintaining the leading position of railway transport in the international transportation market led to the creation of its combined interaction with other modes of transport. In countries that have access to international traffic through the sea, rail-ferry services have been developed. At the initial stage of functioning of this symbiosis, only freight and passenger cars were transported by sea. At the moment, it has become possible to follow container trains on railway ferries by sea. An example would be the international Silk Road corridor, which connects Ukraine with China. Important components of this corridor are two rail-ferry routes through the waters of the Black and Caspian Seas.
Effective Mistuning Identification Method of Integrated Bladed Discs of Marine Engine Turbochargers.
(2020) Píštěk, V.; Kučera, P.; Fomin, O.; Lovska, A.
Radial turbine and compressor wheels form essential cornerstones of modern internal combustion engines in terms of economy, e ciency and, in particular, environmental compatibility. As a result of the introduction of exhaust gas turbochargers in the extremely important global market for diesel engines, higher engine e ciencies are possible, which in turn reduce fuel consumption. The associated reduced exhaust emissions can answer questions that results from environmentally relevant aspects of the engine development. In shipping, the international Maritime Organisation (IMO) prescribes the step-by-step reduction of nitrogen oxide and other types of emissions. To reduce these emissions, various systems are being developed, in which turbochargers are an important part. The requirements for the reliability and service life of turbochargers are constantly increasing. Turbocharger blade vibration is one of the most important problems to be solved when designing the rotors. In the case of real rotors, so-called mistuning arises, which is a slight deviation of the properties of the individual blades from the design parameters. The article deals with an e ective method of mistuning identification for cases of integrated bladed discs of marine engine turbochargers. Unlike approaches that use costly scanning laser Doppler vibrometers, this method is based on using only a simple laser vibrometer in combination with a computational model of the integrated bladed disc. The added value of this method is, in particular, a significant reduction in the cost of laboratory equipment and a reduction in the time required to obtain the results.
Establishing patterns in the dynamic loading on the body of a semiwagon with an elastic middle part of the girder beam.
(2020) Fomin, O.; Lovska, A.; Medvediev, I.; Shatkovska, H.
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
Investigation of the dynamic loading of a body of passenger cars during transportation by rail ferry.
(2019) Lovska, A.; Fomin, O.; Horban, A.; Radkevych, V.; Skok, P.; Skliarenko, I.
To ensure the safety of passenger carriages by rail ferries, mathematical modeling of dynamic loading is performed. The accelerations are determined as components of the dynamic load acting on the body of a passenger car. This takes into account the actual hydrometeorological characteristics of the water area of the railway ferry. The calculations are made in relation to the railway ferry "Mukran", which moves the Baltic Sea. The model takes into account that the car body is rigidly fixed relative to the deck and during the oscillations of the railway ferry follows the trajectory of its movement. The solution of the mathematical model is implemented in the Mathcad software environment using the Runge-Kutta method. It is established that the maximum value of the acceleration acting on the car body is 1.8 m/s2. Determination of the dynamic loading of the passenger car body during transportation by sea is also carried out by computer simulation. The calculations were carried out in the CosmosWorks software package using the finite element method. Numerical values and acceleration distribution fields are obtained relative to the carriage body structure of a passenger car. A modal analysis of the car body during transportation by rail ferry is carried out. The numerical values of the critical frequencies and waveforms are obtained. To check the adequacy of the developed models, a calculation is made according to the Fisher criterion. It is established that the hypothesis of adequacy is not rejected. The research will contribute to the creation of recommendations on the safety of passenger carriages by railway ferries, as well as the manufacture of their modern structures in terms of car-building enterprises.
Strength determination of wagon bearing structures made of round pipes at railroad ferry transportation.
(2019) Fomin, O. V.; Lovska, A.; Píštěk, V.; Kučera, P.
The article presents the results of strength simulation of the bearing structure of freight wagon bodies made of round pipes during railway ferry transportation. In order to reduce the cost for manufacturing freight wagons, the introduction of round pipes in the supporting structure was proposed. In order to ensure the possibility of transportation of the designed structures of wagons on railway ferries, it was proposed to install on their draw bars an assembly unit for fixing with regard to decks. The value of the dynamic load which acts on the supporting structures of the bodies of the main types of freight wagons transported on the railway ferry was determined and the strength was calculated. It was established that the maximum equivalent stresses are within admissible values. The obtained results will enhance the efficiency of the operation of freight wagons through international transport corridors.
Study into Improvement of the Hatch Covers of General-Purpose Open Wagons to Provide Strength under Operational Loading Diagrams.
(2019) Fomin, O., Gerlici, J., Gorbunov, M., Lovska, A., Kravchenko, K., Burlutski, O., Lack, T.; Fomin, O. V.; Gorbunov, M. I.; Lovska, A.; Kravchenko, K.; Burlutski, O.; Lack, T.
The article presents the results of research into the strength of the hatch covers of general-purpose open wagons. It was detected that strength of the standard hatch covers is not provided in operational loading diagrams. Therefore, new designs of the hatch covers for open wagons were proposed. The results of the strength calculation, implemented with the finite element method, make it possible to conclude that at basic and additional operational loading diagrams the strength values for proposed designs of hatch covers do not exceed the admissible values. The research conducted can contribute to a higher strength of the carrying structures of the bodies of general-purpose open wagons in operation, thus, guaranteeing a higher operational efficiency of the rail transport.
Substantiating the optimization of the load-bearing structure of a hopper car for transporting pellets and hot agglomerate.
(2020) Fomin, O.; Lovska, A.; Skliarenko, I.; Klochkov, Yu.
The dynamic loading analysis of containers placed on a flat wagon during shunting collisions.
(2019) Fomin, O. V.; Lovska, A.; Radkevych, V.; Horban, A.; Skliarenko, I.; Gurenkova, O.
There are given the features of the dynamic loading mathematical modeling of containers placed on a flat wagon during shunting collision in the article. The numerical values of the accelerations acting on the container are determined. The results are confirmed by computer simulation. The developed models are verified by the F-criterion. The conducted studies will contribute to the creation of recommendations on the creation of new generation containers on car-building enterprises and increase the efficiency of combined transport operations.
The Substantiation Of The Concept Of Creating Containers With Viscous-Elastic Connections In Fitting.
(2019) Fomin, O.; Lovska, A.; Daki, O.; Bohomia, V.; Tymoshchuk, O.; Prokopenko, P.
The article presents the results of the substantiation of the concept of creating new-generation containers with viscous-elastic connections in fitting. For this purpose, a mathematical modeling of the dynamic loading of containers placed on a flat wagon while maneuvering concussion was carried out. The optimal parameters of elastic-viscous bonding in fittings are determined, in which the value of the dynamic loading of the carrier structure of the container does not exceed the normalized value. The carried out researches will promote creation of new generation containers with improved techno-economic and ecological indicators.
Визначення показників міцності несучої конструкції кузова критого вагону з круглих труб при перевезенні на залізничному поромі
(2019) Fomin, O. V.; Lovska, A.; Masliyev, V.; Tsymbaliuk, A.; Burlutski, O.; Фомін, О. В.; Ловська, А. О.; Маслієв, В. Г.; Цимбалюк, А. В.; Бурлуцький, О. В.
Підвищення ефективності перевізного процесу через міжнародні транспортні коридори сприяє розвитку інтероперабельних систем. Успішне функціонування інтероперабельного транспорту можливе лише при надійній та злагодженій роботі окремих складових між собою. У зв’язку з цим необхідним є впровадження в експлуатацію рухомого складу нового покоління з покращеними техніко-економічними показниками. Розроблено несучу конструкцію критого вагона, особливістю якого є те, що елементи кузова виготовлені з труб круглого перерізу, а для надійності закріплення його відносно палуби залізничного порому на шворневих балках розміщуються вузли для закріплення ланцюгових стяжок. Для уточненого визначення показників міцності кузова критого вагона досліджено його динамічну навантаженість при найбільш несприятливій розрахунковій схемі – кутові переміщення залізничного порому навколо повздовжньої осі (еквівалент коливань бічна хитавиця в динаміці вагонів). Визначення максимальної величини прискорень здійснено шляхом математичного моделювання процесу коливань залізничного порому з вагонами, розміщеними на його палубах з використанням метода Лагранжа ІІ роду. Розв’язання диференціального рівняння коливань залізничного порому з вагонами, розміщеними на ньому, проведено за методом Рунге-Кутта в середовищі програмного забезпечення MathCad. При визначенні загальної величини прискорення, яке діє на кузов критого вагона при перевезенні на залізничному поромі також враховано горизонтальну складову прискорення вільного падіння, яка обумовлена кутом нахилу (крен) залізничного порому. Отримане значення прискорення, як складова динамічного навантаження, враховане при дослідженні міцності несучої конструкції кузова критого вагона. Розрахунок проведений за методом скінчених елементів в програмному забезпеченні CosmosWorks. Для цього розроблено модель міцності несучої конструкції кузова критого вагону з круглих труб при перевезенні на залізничному поромі. Встановлено, що максимальні еквівалентні напруження не перевищують допустимі для марки сталі металоконструкції кузова та складають близько 280 МПа. Визначено проектний строк служби вузла для закріплення ланцюгових стяжок на кузові критого вагону при перевезенні на залізничному поромі. Результати досліджень можуть використовуватися при проектуванні вагонів нового покоління з покращеними технікоекономічними та експлуатаційними показниками.

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