Olegas Prentkovskis

Vilnius Gediminas Technical University (VILNIUS TECH)

The purpose of this research is to determine the vertical vibration and frequency spectrum transmitted to the rider by electric scooters travelling on different types of road surfaces. Vibration analysis involves the measurement of vibration levels of e-scooter elements, accompanied by the analysis of the Fourier Transform Spectrum and using a t-sa...

The Conference is a continuing traditional event of the VILNIUS TECH Faculty of Transport Engineering and has been organized in cooperation with partners since 2001. The selected papers of the conference will be published in the Lecture Notes in Intelligent Transportation and Infrastructure, which is indexed by Clarivate Analytics (Web of Science:...

The pursuit of studying the quadratic minimum spanning tree (QMST) problem has captivated numerous academics because of its distinctive characteristic of taking into account the cost of interaction between pairs of edges. A QMST refers to the minimum spanning tree, which is a graph that is both acyclic and minimally connected. It also includes the...

The results of the influence of a range of process liquids on the formation of strengthened nanocrystalline structures in the surface layers of steel samples with different carbon content during thermo-deformation treatment are presented. The liquids were mineral oil; mineral oil with active additives containing polymers; water; and an aqueous solu...

The main objective of the transport reliability and maintenance analysis is to improve the understanding of accidents through incident investigations. This research focuses on composite pneumatic tyres used in transportation engineering and presents both theoretical and experimental studies. The finite element method used for numerical simulation c...

Autonomous vehicles are currently on their way and they have already started to gradually alter the fundamentals of the entire transport system. However, while in relatively near future, seeking to use their full potential during various urban traffic scenarios, further developments must be done in such fields as the sensing and perception, path pl...

Dear Colleagues, Vilnius Gediminas Technical University – VILNIUS TECH (Vilnius, Lithuania) has the pleasure of inviting You to join the 15th International Scientific Conference TRANSBALTICA 2024: Transportation Science and Technology. The Conference will be held on September 19–20, 2024. The Conference aims to overview relevant issues of the tra...

Micro-mobility is currently a significant global trend in cities’ transportation sector. However, they have resulted in numerous accidents, primarily due to incorrect usage and insufficient safety measures. This paper introduces a model designed for simulating the vertical dynamic behaviour of electric kick scooters. The model takes into considerat...

The current article presents the research results of the proposed energy-saving way in hydraulic drives based on a biomimetic approach. Experimental measuring for investigation energy consumption by different types of high-pressure hoses and its influence on the inside fluid flow are presented. The methodology presented in this paper for experiment...

During the TDT of 41Cr4 steel specimens, a uniformly reinforced white layer with a nano-crystalline structure is formed in the surface layers. The wear resistance of sliding friction without the lubrication of a pair of steel 41Cr4—grey cast iron EN-GJL-200 (EN) under the face-to-face (“ring-ring”) scheme has been studied. It is revealed that when...

Travelling salesman problem (TSP) is a well known combinatorial optimization problem which has drawn colossal attention due to its eclectic range of applications. In this article, we have proposed two modified versions of intelligent water drops (IWD) algorithm. The first one is the enhanced IWD (e-IWD) algorithm to solve single objective TSP. In t...

Reliability and maintenance analysis in transport focus on the main objective of accident and incident investigations that benefit to better understanding of the causes of accidents and prevention of them in the future. The conducted research presents theoretical and experimental research on composite pneumatic tire used in transport engineering. T...

The paper discusses minimizing the effect of external mechanical vibration on hydraulic valves in different military hydraulic drive systems. The current research work presents an analysis of the potential to reduce vibration on the valve casing by installing a valve flexibly on a vibrating surface, i.e., by introducing a material with known stiffn...

The article presents the results of assessment and forecasting of transport and operational condition of airfield pavements on the example of airfield pavements of Kyiv and Mykolaiv International Airports. Domestic and foreign methods of assessment of transport and operational condition and calculation of airfield pavements have been analyzed. One...

The work presents theoretical research on the pneumatic and airless tires based on the numerical modelling using the Finite Element Method (FEM) like alternative to experimental testing, since its time and economical values are more effective for a research connecting with a tire behaviour. The approach presented in this research of the numerical s...

Improving the reliability of transport vehicles requires ensuring their durability while reducing metal consumption [...]

The economic growing in the last years lead for land vehicles to become an irreplaceable meaning of cargo transportation and peoples travel. The massive increasing of using personal vehicles and increasing a number of cargo transportation vehicles lead for raising the different research needs in driving towards a better vehicle structures and road...

The Indian Railways Reservation System (IRRS) is one of the world’s busiest reservation systems of railway tickets. Recently, the COVID-19 pandemic situation has severely impacted the Indian Railway’s (IR) transportation, which eventually has enforced the IR to alter the passenger reservation system. This research attempts to evaluate and analyse t...

The mechanical properties (hardness, cohesion, and residual stresses) of arc coatings designed for operation under conditions of boundary friction and corrosive-abrasive wear are analyzed. The coatings were formed by arc spraying cored wires (CW) with different charge compositions (the content of carbon, aluminum, and boron in CW charge varied). It...

From the mid-1990s onwards, the concept of competitiveness was introduced to firms at the level of countries, regions, and cities. It was used as an index of the success and superiority of places. The present study used quantitative (survey) and qualitative methods in the framework of the exploratory paradigm to achieve key driving variables affect...

The quality, wear and safety of metal structures can be controlled effectively, provided that surface defects, which occur on metal structures, are detected at the right time. Over the past 10 years, researchers have proposed a number of neural network architectures that have shown high efficiency in various areas, including image classification, s...

There were examined the problems of passage of the regulated parts of a road. There were investigated the changes of a traffic movement intensity in Lutsk (Ukraine) during the spread of Covid-19 pandemic. The graphic dependences of the drivers’ actions estimation while passing the traffic lights objects on a chosen movement route at the beginning o...

The results of comparing analysis of behaviour and energy efficiency between standard (regular) and compact versions of high-pressure hoses used in the machinery hydraulic drives are presented in this article. The approach in this research is based on the experimental measurement of high-pressure hose vibration, inside fluid flow pressure measureme...

The article presents the results of assessment and predictive modelling of the transport and operating condition of aerodrome pavement surface on the example of Zaporizhzhia International Airport runway. Domestic and foreign methods for assessing the transport and operating condition of aerodrome pavement have been analyzed. When assessing the tran...

The correlation between the service characteristics of the working surfaces of car parts belonging to the rotary body class, and quality parameters—in particular, the height-related roughness parameter Ra—was estimated. Low values of Ra were found to be unable to guarantee an optimal microrelief geometry and, accordingly, high-performance character...

Reliability and maintenance analysis of transport machines hydraulic drives, basically focused to power units: pumps, cylinders etc., without taking in to account junction elements. Therefore, this paper proposes a research analysis on high-pressure hoses and junctions during technical maintenance. Comparative analysis of fluid behavior and energy...

The micro- and macroscopic fatigue crack growth (FCG) rates of a wide class of structural materials were analyzed and it was concluded that both rates coincide either during high-temperature tests or at high stress intensity factor (SIF) values. Their coincidence requires a high level of cyclic deformation of the metal along the entire crack front...

This paper deals with the evaluation of mechanical and tribological properties of Ni-Co galvanic coatings at elevated temperatures. The coatings were deposited on the copper surface, which in practice is the material of the crystallizer. Ni-Co coatings are manufactured to increase the abrasion resistance of the crystallizer surface at elevated oper...

Dynamic non-equilibrium processes (DNP) caused by impact-oscillatory loading affect the mechanical/structural changes and fatigue life of aluminium alloy 2024-T351 under static tension at a load frequency of 110 Hz. The main patterns of this effect are considered. Dynamic deformation εimp was chosen as the control parameter of DNP. In other words,...

The process of laser welding of sheets of HSLA (high-strength low-alloy steel), DP600 (dual-phase steel) and TRIP steels was investigated. A weld was successfully made in a double-sided hot-dip galvanized sheet with a thickness of 0.78–0.81 mm using a laser power of 2 kW per pass without any pretreatment of the weld zone. Microstructure studies rev...

Classification of steel surface defects in steel industry is essential for their detection and also fundamental for the analysis of causes that lead to damages. Timely detection of defects allows to reduce the frequency of their appearance in the final product. This paper considers the classifiers for the recognition of scratches, scrapes and abras...

Purpose: of this paper is to analyse the mechanism of near-neutral pH corrosion of main gas pipelines. The stages of main gas pipelines in model environments that meet the soil conditions of Ukraine have been studied. Design/methodology/approach: The corrosion rate of steel specimens from steels 17G1S-U and 20 and the influence of borate buffers on...

New experimental results on extending the fatigue life of aluminum alloys D16ChATW and 2024-T351 due to impact-oscillatory loading of different intensities and the use of nanosolutions of different materials are generalized. Dynamic deformation of alloys subjected to dynamic non-balanced processes (DNP) under impact-oscillatory loading εimp was cho...

The analytical dependences for determining the overlap area of V-shaped grooves of partially regular microrelief shifted by an angular pitch of 0.5° are established. The V-shaped grooves are formed on the end surface of the rotary body by vibration. In addition, the intersection between groove elements can be of different types. The relationship be...

The article considers the schemes of groove arrangement on a partially regular microrelief of type I with coaxial grooves formed on end faces of rotary bodies because of vibration. An analytical dependence was obtained to determine the relative area of a partially regular microrelief depending on the geometrical parameters of the V-shaped grooves....

This book reports on cutting-edge theories and methods for analyzing complex systems, such as transportation and communication networks and discusses multi-disciplinary approaches to dependability problems encountered when dealing with complex systems in practice. The book presents the most noteworthy methods and results discussed at the Internatio...

In this article, we analyse five types of coatings, in terms of their microstructure, hardness, porosity, and wear resistance, in the as-sprayed state. The coatings are WC-based (WC-FeCrAl, WC-WB-Co, and WC-NiMoCrFeCo), alloy-based (Co-MoCrSi), or nanoWC coating-based (nanoWC-CoCr). Two tests were applied to assess the wear resistance of the coatin...

A new adhesive material and a restoration technology for marine equipment units are proposed. The optimal content of hardeners of different nature is found, and the effect of temperature conditions used for crosslinking epoxy resin DER-331, on the adhesive properties of the polymeric material is determined. The polymerization of the epoxy oligomer...

The effect of sulfate-reducing bacteria (SRB) on the corrosion of steel 20 was investigated. Results demonstrated that the chemical composition of corrosion products, the corrosion rate, and corrosion type were altered due to the adherence of SRB and the subsequent formation of biofilm on the steel 20 surface. The micromechanisms of biocorrosion da...

New experimental data on the influence of changes in the structural and mechanical condition of aluminum alloys D16ChATW and 2024-T3 due to impact-oscillatory loading on a wide-range variation of their fatigue life are presented. The dynamic deformation of the alloys in the process of realization of dynamic non-equilibrium processes (DNP) due to im...

The study was aimed at identifying the problems of using winter tyres according to the vehicle braking performance. Due to the common problem of using second-hand winter tyres during the summer season, the tyre tread depth and temperature were chosen as the main indicators of the study. The winter mix tyres are distinguished by the suitability for...

Nowadays, vehicles have advanced driver-assistance systems which help to improve vehicle safety and save the lives of drivers, passengers and pedestrians. Identification of the road-surface type and condition in real time using a video image sensor, can increase the effectiveness of such systems significantly, especially when adapting it for brakin...

Main damage types of transport infrastructure under breach of drainage were systematized and their causes were discovered. The causes of those failures were found mainly linked to poor drainage, traffic overloading, expansive subgrade soils, and the use of low quality materials in construction.

The advantages of application in the transport and loading systems of gripping devices with the integrated functions of control of parameters of objects of transportation were substantiated. Modeling of Bernoulli gripping devices with a possibility of dimensional check and weight objects of manipulation is offered. Modeling of dynamics of course of...

The article presents theoretical research of rotation vibrations in the transmission system. Transmission with an idle consists of electrical motor, gear box and connecting shafts. In the gear box some teeth have different size of the defects (0%, 20%, 50%, 80% of teeth width). In the dynamics model of gears, the deformation of each tooth and backl...

As indicated by a worldwide common perspective about health and sustainable health systems, the health structure as a part of public health is a key theme of many societies. The future is shaped by probable future scenarios, for which dealing practically has many complications. This study is focused on the future scenarios for a comprehensive susta...

This book gathers papers presented at the 11th international scientific conference "Transbaltica: Transportation Science and Technology", held on May 2-3, 2019 at Vilnius Gediminas Technical University, Lithuania. It covers cutting-edge issues concerning research and development of modern transport systems. The chapters, written by an international...

This book reports on cutting-edge theories and methods for analyzing complex systems, such as transportation and communication networks and discusses multi-disciplinary approaches to dependability problems encountered when dealing with complex systems in practice. The book presents the most noteworthy methods and results discussed at the Internatio...

The melting conditions of the electrode wires and the structure of coatings, obtained by the electric arc spraying method depending on the pressure of the spraying air flow, are analysed in the current paper. The effect of air pressure on the spraying angle of the flow of melted metal droplets is demonstrated. It is established that due to the decr...

Functional application advantages of the contactless Bernoulli grippers with an annular nozzle at robotization of handling operations are presented in the current paper. The method of calculation of power characteristics of Bernoulli grippers is presented as well. Computational modeling of dynamics of air flow in the camera, an annular nozzle of Be...

Nowadays, companies are able to obtain the key to success in global competition by choosing the right suppliers who are more align with their strategies. It is clear that applying appropriate attitudes and criteria have a great importance in choosing suppliers in the process of decision-making by chain managers and especially purchasing managers. I...

This manuscript starts with a detailed analysis of the current solution for the queueing system M/Er/1/∞. In the existing solution, Erlang’s service is caused by Poisson’s arrival process of groups, but not individual clients. The service of individual clients is still exponentially distributed, contrary to the declaration in Kendall’s notation. Fr...

This book gathers papers presented at the International Conference “Vision Zero for Sustainable Road Safety in Baltic Sea Region”, held on December 2018 at Vilnius Gediminas Technical University, in Vilnius, Lithuania. Taking as a starting point the multi-national road traffic safety program Vision Zero, originated in Sweden in 1995, the book aims...

This book reports on cutting-edge theories and methods for analyzing complex systems, such as transportation and communication networks and discusses multi-disciplinary approaches to dependability problems encountered when dealing with complex systems in practice. The book presents the most noteworthy methods and results discussed at the Internatio...

New methods for enhancing the plasticity and strengthening the surface layers of materials for aircraft industry are proposed. The modes of dynamic non-equilibrium processes (DNP) are grounded, which under the symmetric impact-oscillatory loading can significantly improve the plastic properties of two-phase high-strength titanium alloys. Of particu...

Samples obtained from natural gas pipelines were used directly for determine the regularities in corrosion steels 17G1S-U and 20 under the influence of sulfate-reducing bacteria (SRB) of type Desulfovibrio sp. strain Kyiv-10 and their relation to the microstructure of steel in condition that simulated a natural gas pipeline environment. Microbiolog...

The article presents theoretical research of a transmission system that allows examination of the dynamic processes evaluating different sizes of defects in gear tooth (0%, 20%, 50%, 80% of teeth width) and gaps between the connection of the gear teeth. The dynamics of the transmission is described using the finite element method and discreet eleme...

Material Handling Equipment is a set of different tools, devices, applications that aim to facilitate the handling of materials and products. It is used inside the warehouse, but also between warehouses and production facilities. As an important type of material handling equipment, automatically guided vehicles (AGVs) play one of the key roles in w...

The daily requirements and needs imposed on the executors of logistics services imply the need for a higher level of quality. In this, the proper execution of all sustainability processes and activities plays an important role. In this paper, a new methodology for improving the measurement of the quality of the service consisting of three phases ha...

The research of fractographic images of metals is an important method that allows obtaining valuable information about the physical and mechanical properties of a metallic specimen, determining the causes of its fracture, and developing models for optimizing its properties. One of the main lines of research in this case is studying the characterist...

In free market conditions, if public passenger transport services are commercially unprofitable, there will be no interest for transport companies to perform them. However, directly because of the citizens’ interests, on the one hand, and indirectly because of the economy, passenger public transport services have become of a general public interest...

The complex analysis of fractures of high-strength titanium alloy VT23 was performed at the macro- and microlevels, and the basic patterns of fracture under static stretching and after the realization of dynamic non-equilibrium processes caused by impact-oscillatory loading and subsequent static stretching were revealed. The morphological regularit...

Based on the experimental data on the roughness parameter Ra, which stands for the mean arithmetic deviation of the profile, as obtained in the process of turning test specimens from different materials with constant elements of the cutting mode (depth a and velocity v) and structural-geometric parameters of the cutting tool, but with different fee...

The contactless transport of a flat object with a displaced center of mass by means of the Bernoulli gripper is considered. When shifting the center of mass of the object of manipulation relative to the axis of the Bernoulli gripping device, there is a deviation from the parallelism between their active surfaces in the static position. For this cas...

The paper presents the study of the influence of mechanical damage on the safe operation of gas transmission pipelines. The main types of pipeline damage with the actual parameters and their influence on the operational parameters are analysed. The damaged fractures of the section of the pipeline Kaunas (Lithuania)–Kaliningrad (Russia) were investi...

This study proposes a hybrid multiple criteria decision making (MCDM) methodology for evaluating the performance of the Indian railway stations (IRS). Since the customers are heterogeneous and their requirements are often imprecise, the evaluation process is a critical step for prioritizing the IRS. To improve the existing approaches, an efficient...