Кафедра "Теоретична та будівельна механіка"<br>(з 2022 р увійшла до складу кафедри Технічна механіка ДІІТ) (з 2016 року об’єднано каф. "Теоретична механіка" та каф. "Будівельна механіка")

Permanent URI for this community

http://crust.ust.edu.ua/handle/123456789/9307

ENG: Department "Theoretical and Structural Mechanics" "Theoretical Mechanics" and "Structural Mechanics"

Browse

Now showing 1 - 6 of 6

Analysis of Problem Related to Experimental Data Processing in the Study of the Rolling Stock Influence on the Track
(KTU leidykla „Technologija“, Kaunas, Lithuania, 2022) Bondarenko, Iryna; Keršys, Robertas; Neduzha, Larysa
ENG: In paper discusses the problem of the correctness of the unification of experimental data by axes and points of measurement. The purpose of the study is to analyse experimental data in the study of the influence of the rolling stock on the railway track associated with the change of the nature and ratio of values of forces and stresses when combining data. Experimental data obtained from the study of the influence of Tulpar Talgo on the railway track were considered. The main feature is the construction of a trolley having one wheel instead of two, which makes it possible to show the nature of changes in stresses and forces when grouping data. This made it possible to assess the correctness of the unification in terms of the nature of the force ratio for the passage of rolling stock in the study area.
Assessment of the Railway Track Deformability Behaviour as the Parameter of Operational Availability Function
(Printing House “Technologija”, Kaunas, Lithuania, 2021) Bondarenko, Iryna; Keršys, Robertas; Neduzha, Larysa
EN: In paper discusses the problem of the maintenance conditions of the railway track to ensure operational availability in terms of ensuring reliability and maintainability program. The research aims to assess the amount of work spent in railway track deformability under vehicle influence when various railway track stiffness and at different speeds of the vehicle. The research aims to assess the amount of work spent in railway track deformability under vehicle influence when various railway track stiffness and at different speeds of the vehicle. Authors considered the influence of the vehicle speed movement on the vertical dynamic load from vehicle to the rail, the vertical dynamic rail deflection, and vertical dynamic stiffness of the railway track. It allowed estimating the amount of deformability work performed by the rail at vertical load.
Dynamic Sustainable Processes Simulation to Study Transport Object Efficiency
(MDPI, Basel, Switzerland, 2022) Bondarenko, Iryna; Severino, Alessandro; Olayode, Isaac Oyeyemi; Campisi, Tiziana; Neduzha, Larysa
ENG: The development of reliability theory has led to the setting of tasks requiring consideration of the efficiency and functional safety of technical objects of transport over the life cycle. The paper demonstrates the possibility of using the universal laws of elastic wave theory to describe natural phenomena occurring in complex dynamic systems, on the examples of solving issues arising in the interaction of rolling stock and the railway track. The accounting of the time component and the ability of elastic waves to propagate energy in time and space allowed considering any interaction process as a chain of processes, incidence-reflection-refraction of force impulses of interaction. Understanding the physics of dynamic processes that occur in objects while performing their intended functions allows developers to improve objects in such a way as to minimize their life cycle cost and maximize their ability to perform their intended functions under different operating conditions. In addition, it allows the expansion of existing methods and approaches to diagnostics of dynamic transport systems. All this is a base for making it possible to develop an innovative and effective tool for engineers and scientists to assess the impact of technosphere transport objects on human habitats.
Investigation of Dynamic Processes of Rolling Stock–Track Interaction: Experimental Realization
(MDPI, 2023) Bondarenko, Iryna; Lukoševičius, Vaidas; Keršys, Robertas; Neduzha, Larysa
ENG: The dynamic process of the railway track–rolling stock interaction is characterized by timedependent dynamics that are determined by both the varying characteristics of the interaction objects and the varying climatic conditions. This study investigated the effect of different groups of influence on the dynamic process, with a view towards the reduction of the cases of randomness during the registration of the process in experiments and an expansion of the understanding of the processes happening during the assessment of the registered data. The static nature of the rolling stock has been demonstrated to be not uniform and to influence the scattering of dynamic values under the variation of vertical and horizontal forces due to the characteristics of a rolling stock. The position of the rolling stock truck relative to the track axis during the movement of the rolling stock has been shown to enhance static non-uniformity. The results of the longitudinal force measurements under the three-point and Schlumpf methods have suggested that it is necessary to investigate the process of rail warping under the action of the rolling stock wheels. To enhance the output of the experiments, it is proposed to consider not only the stiffness of the basis of the oscillatory processes that imitate the physical process of oscillation of the system elements by means of the oscillation amplitude, but also the time of response to the oscillation process by using and assessing the triggering time rather than the frequencies of the oscillation processes.
Studying of Dynamic Parameters Impulse Impact of the Vehicle Taking into Account the Track Stiffness Variations
(Printing House “Technologija”, Kaunas, Lithuania, 2021) Bondarenko, Iryna; Keršys, Robertas; Neduzha, Larysa
ENG: Authors analysed the ways of descriptions of the dynamic parameters impulse impact of the rail vehicle and surveyed the features of the system “vehicle-track” modelling. Dynamic parameters of impulse impact of the rail vehicle and them influence of describing ways of the dynamic parameters of the vehicle impulse on the dynamic track deformability were examined. Finally, basic conclusions and recommendations are given.
Using Detailing Concept to Assess Railway Functional Safety
(MDPI, 2023) Bondarenko, Iryna; Campisi, Tiziana; Tesoriere, Giovanni; Neduzha, Larysa
ENG: The ability to assess the risks of the functional safety of railway tracks allows harmonizing characteristics of track elements under certain operating conditions under certain maintenance for the efficient use of the track structure throughout its life cycle. The concept of detailing conditions of the interaction of the rolling stock and railway track was used for the productive solution of tasks of infrastructure functional safety assessment. The paper formed an approach to the analytical solution of determination problems of deformability parameters over time using the elastic waves theory. The formation method of interconnections between the technical and economic aspects of the operation of railway infrastructure was proposed. The criteria of deformability work and intensity of use were utilized for the effective use of the track structure through its life cycle. The results of calculations are presented to assess changes in the deformability behaviour of the track elements and structure when the force and speed parameters of the operating conditions change, as well as the algorithm of the method for estimating the operation deformability of the railway track. Thus, the proposed approach can be adapted to optimize objects by railway functional safety assessment at the stage of object operation simulation.

Browse

Results Per Page

Sort Options