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 Author "Kučera, P."
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Item 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 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.