ДН-02-19 «Фундаментальні основи створення адекватно-спрямованого напружено-деформованого стану мультифункціональних модулів вагоноконструкцій з можливостями перспективного широкого машинобудівного застосування»
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Browsing ДН-02-19 «Фундаментальні основи створення адекватно-спрямованого напружено-деформованого стану мультифункціональних модулів вагоноконструкцій з можливостями перспективного широкого машинобудівного застосування» by Subject "dynamic load"
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Item 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 motionItem 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 transportationItem Research of stability of containers in the combined trains during transportation by railroad ferry.(2020) Fomin, O., Lovska, A., Pistek, V., Kucera, P.; Fomin, O., Lovska, A., Pistek, V., Kucera, P.; Fomin, O., Lovska, A., Pistek, V., Kucera, P.; Fomin, O., Lovska, A., Pistek, V., Kucera, P.The article presents results of computational modelling of containers dynamic load during transportation as a part of trains of intermodal transport on a railway ferry. The computational models were developed which account the movement of the container with regard to the frame of the flat wagon while moving of the railway ferry. It was assumed that there is no movement of the flat wagon with regard to the deck, since these movements were limited by fastening means. Attention was also paid to the movement of liquid bulk cargo in the boiler when studied the dynamic load of the tank container. The obtained acceleration rates, as components of the dynamic loads acting on the container, were accounted while determining the containers stability coefficient with regard to the flat wagons. The railway ferry heeling angles which ensure the stability of the containers were determined. The researches will ensure safety of transportation of containers as a part of trains of intermodal transport on a railway ferry, as well as increase the efficiency of operation of intermodal transport in the international transport.