Кафедра Технічна механіка ДІІТ ( з 2022 року утворена шляхом з'єднання кафедри Прикладна механіка ІПБТ та кафедри Теоретична та будівельна механіка ДІІТ)
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UKR: Кафедра Технічна механіка ДІІТ
ENG: Department of Technical Mechanics of DIIT
ENG: Department of Technical Mechanics of DIIT
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Browsing Кафедра Технічна механіка ДІІТ ( з 2022 року утворена шляхом з'єднання кафедри Прикладна механіка ІПБТ та кафедри Теоретична та будівельна механіка ДІІТ) by Author "Lukoševičius, Vaidas"
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Item Innovative Trends in Railway Condition Monitoring(ELSEVIER B. V., 2024) Bondarenko, Iryna; Lukoševičius, Vaidas; Keršys, Robertas; Neduzha, LarysaENG: Provision of functional safety of a railway track requires complementing the existing system of assessment of the railway track condition with the stress-strain behaviour assessment of the rail substructure, i.e. the assessment of the effect of track structure elasticity on the change of its geometric parameters during rolling stock passage over time. There is a lack of available theoretical and practical information about any pivotal changes in this field of science. The subject of the study is the in-situ elasticity indicators of a railway track and geometric monitoring indicators of railway structure condition or similar indicators obtained by numerical processing of data provided by the measuring systems of a track recording car and enabling the determination of change of irregularity parameters over time taking into account of the tonnage passed. The outcome of the investigation is the proposed approach to the development of an unparalleled diagnostic loading system which has been the missing part of the “puzzle” in the existing system of integrated assessment of the technical condition of a railway track.Item Investigation of Dynamic Processes of Rolling Stock–Track Interaction: Experimental Realization(MDPI, 2023) Bondarenko, Iryna; Lukoševičius, Vaidas; Keršys, Robertas; Neduzha, LarysaENG: 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.Item Novel ‘Closed’-System Approach for Monitoring the Technical Condition of Railway Tracks(MDPI, Basel, Switzerland, 2024) Bondarenko, Iryna; Lukoševičius, Vaidas; Neduzha, LarysaENG: Assessing the technical condition of a railway track throughout its service life is crucial to ensuring functional safety. However, it is important to note that current approaches have theoretical and practical gaps that require attention. The purpose of this study is to discuss the reconceptualization of an integrated approach to assess changes in the technical condition of railway tracks caused by rolling stock over their service life. Improving existing systems for assessing the condition of the track can be achieved by modifying the model concept and, subsequently, the measurement and assessment procedures. This paper presents an alternative method for addressing technical issues related to the monitoring and diagnosis of railway tracks, with a particular focus on natural phenomena: energy transfer by elastic waves. The primary aim of this work is to propose an approach for designing a ‘closed’ measurement system that enables tracking of the cause-and-effect relationship. This system takes into account both the elastic dissipative characteristics of the track–rolling stock interaction and the influence of the dynamics of various components in the ‘train-track’ system.