Scientific Journal of Silesian University of Technology. Series Transport

11

Authors: Babra DURI

Women, particularly in developing countries, rely heavily on public transport for their daily commute. This study explores the safety and security of women using ride-hailing services in Gauteng. Specifically, the study seeks to understand women’s experiences using ride-hailing services, which might influence their mobility. This study employed a constructivist research philosophy, utilizing qualitative, semi-structured interviews to explore the experiences of women who use ride-hailing services. The study findings reveal several disturbing incidents reported by female passengers using ride-hailing services; however, it is important to note that not all drivers exhibit inappropriate behaviour. Some drivers make inappropriate remarks, while others exhibit rude behaviour. The study found that some drivers use longer routes, leading to higher fares, which can be seen as exploitation. The study also reports some incidents where ride-hailing drivers almost kidnapped some female passengers, indicating a severe safety concern. The study contributes to the ongoing discourse on gender and transport studies, providing empirical evidence on the experiences of women using ride-hailing services in Gauteng, South Africa.

13

Authors: Metin Mutlu AYDIN, Dimitris POTOGLOU, Liana CIPCIGAN

In the current literature, it is clearly seen that most of the traffic chaos is generally observed at intersections of the urban roads in cities. On the other hand, many current traffic studies and research prove that fixed-time signalized intersections cannot have a good ability to control and manage current traffic flow at signalized intersection legs. For this aim, intelligent intersections were developed and started to be used in many cities all over the world in the last decade. These new intelligent intersection systems suggest dynamic signal times for all intersection legs by using real-time measured traffic data. These systems generally use cameras or loop detectors, which are located in the proper places on a signalized intersection leg and record vehicle movements. Within the scope of this study, a performance comparison was made for before and after the camera-based intelligent intersection applications at three isolated pilot signalized intersections within the scope of the "Smart City Traffic Safety" project, which is one of the largest Intelligent Transportation System projects in Turkey. After the system was activated, it was observed that the drivers had impatient behaviors in the beginning and had difficulty getting used to these new systems. After the signal cycle was regulated with the learning of artificial intelligence, it was seen that the drivers had more patience and more observant behaviors. It was also obtained from the analysis results that these new intelligent systems resulted in an average 16% decrease in control delays and a 20% decrease in vehicle speeds.

13

Authors: Ermilso DIAZ, Mariela MUÑOZ-AÑASCO, Antonio CORRECHER-SALVADOR

Fleet systems are considered complex due to the interaction between their units and components. Maintenance management systems face various challenges to achieve acceptable availability and reliability rates at a reasonable cost. A critical task for making maintenance decisions is understanding the system requirements to select maintenance policies appropriate for the actual and future system state. When there is a replacement shortage in a fleet system, and it is impossible to supply new spare parts quickly, cannibalization policies can mitigate this scarcity via the interchange of components. However, this procedure presents the maintenance manager with different evaluation effects, such as increased maintenance hours, decreased system reliability rate, and unavailability in some units. Finding an equilibrium between the benefits and risks has caught the attention of researchers. This work gathers diverse proposals for applying cannibalization policies and the effects that arise from using them. Models, methods, tools, and identified gaps in understanding what parameters of the components and environments of the fleet systems favor cannibalization are discussed.

14

Authors: Elżbieta MACIOSZEK, Irena JURDANA

The article presents the issue of the transport of goods in relation to sea transport. Sea transport has been known to mankind for a long time. Currently, maritime transport is not limited only to the transport of goods and/or passengers along sea routes, which are carried out between seaports using appropriately adapted means of transport. It is a branch of transport, which consists of a very good knowledge of navigation, highly specialized staff, and a wide range of containers for transporting various types of cargo, often requiring specialized conditions. In addition, sea transport is perfectly combined with intermodal transport, so that in the end, the transport process is the most beneficial for all participants, i.e., the customers, sellers, distributors, and manufacturers. The main purpose of the article was to present the volume of goods transported in this branch of transport. The article, after introducing the issue, presents the classification of sea vessels, refers to the market of maritime transport services and its conditions for further development, and analyzes the overall volume of goods transported in the seaports of Gdańsk and Gdynia against the background of other Polish seaports in the years 2011-2021.

17

Authors: Kacper CIEŚLAR, Stanisław PŁONKA

The development of the modern automotive industry requires a quick adaptation of new production methods. This is possible thanks to software capable of simulating manufacturing processes. The paper discusses the modeling of the machining operation of a crankshaft’s crankpins for a diesel engine with the use of the planetary milling method. i.e., modeling of milling operation when a disc milling cutter, having its cutting inserts directed inwards, is performing rotary motion, and at the same time, the axis of this milling cutter circulates around the axis of a machined crankpin. For this purpose, a geometrical model of the machining of the crankshaft’s crankpin has been developed. Based on the design documentation of the crankshaft of the 4C90 type diesel engine and the documentation of the Steyr internal disc milling cutter, their CAD models have been developed, and the both models were linked together with suitable kinematic dependencies. In the next step, the crankpin having a length of 25 mm was divided by planes (in quantity lp=21) into 1.25 mm sections. On the main cutting edge of two cutting inserts of the disc milling cutter, points were marked at intersection locations with these planes. Using the Inventor 2016 system, twelve spline curves have been generated for each plane because each plane intersects 12 cutting inserts mounted in cassettes positioned around the circumference of the body of the disc milling cutter. Next, the spline curves were brought to a common coordinate system, rotating them at an angle resulting from the positioning of the cassettes with cutting inserts in the body of the disc milling cutter. Prepared in such a way, spline curves were written in dwg format, which allowed for trimming of the spline curves at the circle with a radius of rcp = 27.90 mm, corresponding to the radius of the crankpin after milling, considering grinding allowance (ø55h6 + 0.80 mm grinding allowance). As a result, it enabled to leave sections of the arcs tangential to the diameter ø55.80 mm and, in such a way, generate the outline of the shape of the crankpin using the REGION command for 21 cross-sections. The outline of the cylindricity of the crankpin was obtained using the strategy of outlines of the roundness, which were generated earlier; this strategy consisted in the collection of 360 points on the circumference of 21 mutually parallel sections cut by planes perpendicular to the axis of the crankpin. To determine the effects of the circular feed rate of the circulating move of the axis of rotation of the internal disc milling cutter on the accuracy of the machining, simulations of the shape of the crankpin were performed for three values of the feedrate: vf = 1200 mm/min; vf = 2100 mm/min and vf = 3000 mm/min. The spline curves with a determined (depending on the duration of the simulation) number of points: 3500, 2100 and 1409 were obtained for each simulation. The calculated cylindricity deviation for the feedrate vf = 1200 mm/min amounted to CYLrck = 0.2272 mm, for the feedrate vf = 2100 mm/min – CYLrck = 0.2406 mm, while for the feedrate vf = 3000 mm/min – CYLrck = 0.2929 mm.

18

Authors: Krzysztof GRZELEC, Katarzyna HEBEL, Maciej HELBIN, Hubert KOŁODZIEJSKI, Olgierd WYSZOMIRSKI

The concept of influencing changes in transport behavior towards sustainable mobility, which is gaining popularity in the 21st century, is free public transport (FFPT). It is estimated that the number of cities in which attempts were made to introduce FFPT exceeds 100. Most of them are located in Europe, especially in France and Poland. FFPT has mostly been restricted to specific city areas or market segments in the hope of increasing demand for public transport services. Because of this, a number of publications on free fare results refer to specific cases in cities. The main aim of this article is to examine the impact of free fares on the behavior and transport preferences of pupils in Gdynia, Poland. On the basis of the study of preferences and transport behavior of the inhabitants of Gdynia, carried out earlier by the team in 2010, 2012, 2015, and 2018, a preliminary description of the behavior and transport preferences of students was prepared. The research of the pupils was conducted twice: before and after the introduction of free travel entitlements. The results of the research carried out, and the data analysis, confirmed that FFPT had no impact on demand for public transport services or the travel behavior of pupils. According to the authors, the lack of positive effects of FFPT on travel behavior in the segment of students, or even more broadly, for achieving the purposes of sustainable mobility, results from the interaction of the following factors: specificity of students' travel behavior determined by the schedule of school activities, pupils' positive attitude to cars as urban transport means, not covering all means of public transport services of FFPT in Gdynia (the city rail is not covered by FFPT), short period of time since FFPT has been introduced. The results of the presented studies could not be verified due to the COVID-19 pandemic. The authors emphasize that before introducing FFPT, politicians should rely on the analysis of anticipated changes in the behavior of residents and the impact of FFPT on the economy of public transport, sustainable mobility goals and political and social results. This article complements the current knowledge on the results related to the introduction of FFPT for a selected group of residents.

20

Authors: Thong Duc HONG, Phat Tan TRUONG, Minh Quang PHAM, Lam Quang TRAN

With the explosion of urbanization, more and more small residential areas with high population density, tiny houses, and narrow roads are formed. As a result, it is challenging for large fire engines to penetrate these areas in the event of a fire incident. In this paper, a compact firefighting vehicle was designed based on the SNAPPER LT140H331KV lawn mower. The vehicle is equipped with a water sprayer system and a folding frame water tank. The water sprayer system transmits power from the lawn mower transmission’s power take-off shaft via the belt and chain drive, which can spray water at a height of about 13 m with a flow rate of 38 L/min. The 500-liter folding frame water tank has a rectangular shape that can be folded and dragged as a trailer. The water sprayer system and folding frame water tank not only have a simple, compact structure but also do not affect the lawn mowing function. This fire truck has a maximum speed of about 15 km/h and can move in a minimal road width of only 1.3 m, which is accommodation for residential areas within a 1÷2 km radius with narrow roads, high density of population and houses in least developed and developing countries (e.g., Vietnam, Laos, Cambodia), where the normal fire engines are difficult to access in time. Besides, the vehicle can be used for watering and spraying pesticides on gardens and small premises. The study has proposed a valuable solution to take advantage of vehicle functions to improve their convenience and usefulness.

22

Authors: Marzena PIOTROWSKA-TRYBULL, Jarosław KOZUBA, Stanisław SIRKO

Airports, as a component of air transport, combine air transport with other modes of transport to strengthen the transportation accessibility of a place in space, attract investors, and stimulate the development of the area. Taking into account that these issues are less exposed in relation to their immediate surroundings, research was undertaken to determine how representatives of the authorities and residents of communes (taking into account the nature of the communes and the size and location of the airport) perceive airports, located within their communes, in the context of their impact on the socio-economic situation in the communes. This was achieved by analysing the communes' strategic documents and data on the operation of communes and airports from 2016 to 2021. These data were obtained from the Civil Aviation Authority, the Central Statistical Office, the International Air Transport Association, and the International Airports Council. In an effort to better understand the relationship between the airport and the commune in which it is located, poll research was carried out using survey and interview techniques. The research focused on 10 airports spread across Poland. A total of 1,200 surveys were conducted among residents of communes, and 10 interviews were conducted with representatives of local governments and the port. To analyse the collected data and present the results, Statistica v.13.3 and R/RStudio software were used.

11

Authors: Artur KAGRAMANIAN, Dmitriy AULIN, Karyna TRUBCHANINOVA, Jacek CABAN, Anatoly VORONIN, Alexsandr BASOV

Main requirements for rolling stock design and organization of the operating system are determined by membership in a certain transportation category for which such a transportation facility is designated. Thus, a specific feature of rolling stock operation is considered to the maximum extent, and functional correspondence with stated tasks is ensured. The significant disadvantage of the existing structure of rolling stock traffic is the necessity of time-space agreements of passenger traffic due to the necessity of shifting different transport types with the minimum time consumption. The solution to such an issue can be found in the development and use of a universal (multifunctional) integrated transport system. The list of issues arising during the creation of a multifunctional transport system can be funnelled into two groups: social and economic and organizational and technical. The first group is social and economic and shall conceptually solve issues of the multifunctional system feasibility for certain urban settlement conditions (conglomerate of urban settlements). The second group consists of organizational and technical issues. This study proposes to eliminate certain material issues in the sphere of suburban and urban traffic by the infrastructure improvement with the significant traffic increase and fluctuations.

13

Authors: Haitham AL HASANAT, Juhasz JANOS

Roundabouts are commonly used worldwide because they offer several advantages over traditional intersections. The capacity that a roundabout can handle is an important factor in ensuring smooth traffic flow at a particular location. Therefore, various models have been developed to describe traffic conditions and driver behaviour at different sites or countries. However, existing models cannot be directly applied to other countries without proper calibration of the models to ensure an accurate estimation of capacity. In this study, five roundabouts in Hungary were selected to develop a general capacity model and compare it with international models. First, all sets of entry and circulating data were obtained from video recordings of each roundabout entry. These data were used to develop a model for each entry and then for each roundabout separately. Finally, all the data sets from all sixteen entries were used to develop a general capacity model (GM). The general capacity model (GM) was compared with the Highway Capacity Manual (HCM) 2016, the Brilon-Bondzio, and the Brilon-Wu models. The maximum capacity of the general capacity model (GM) was 1390 pcu/h, slightly higher than the maximum capacity of the HCM 2016 model of 1380 pcu/h. The percentage differences between the generated general capacity model (GM), HCM 2016, Brilon-Bondzio, and Brilon-Wu models were +0.71%, +12.4%, and +10.7%, respectively.

13

Authors: Yuliia KOSKINA, Svitlana ONYSHENKO, Oleksii DROZHZHYN, Oleksii MELNYK

The paper considers the vessels operating on carriages of bulk cargoes to get the maximum profit for the shipowner as his main goal. The items in search are the long-term contracts of affreightment with some clauses indicated as indeterminate values, that can be described using a range of values. It leads to a range of voyage indicators. The vessels’ deployment for getting the maximum profit depends on the market situation that is to say possible changes in vessels' time-charter rates and freight rates. This paper presents the mathematical model, based on the fleet and volumes of carriages under a set of contracts of affreightment during the due time. It includes the necessity for the commitment fulfilment by owned and time-chartered vessels and takes into account possible changes in freight rates for cargoes carriages. The presented numerical example demonstrates the opportunity for practical implementation of the model.

15

Authors: Rossi PASSARELLA, Siti NURMAINI, Muhammad Naufal RACHMATULLAH, Osvari ARSALAN, Rizki KURNIATI, Aditya ADITYA, Indra Gifari AFRIANSYAH, Rifqi FATHAN, Rani Silvani YOUSNAIDI, Harumi VENY

A runway excursion is a runway safety issue in which an aircraft exits the runway improperly. Therefore, we believe it is necessary to conduct a data investigation of commercial airplanes landing at the airport in order to provide criticism, learning, and social control to airlines and air service policymakers in Indonesia so that they can become involved in protecting public transportation users, particularly those using air transportation. This study focuses on the procedural safety of commercial airplanes landing on the runway at airports in Indonesia. The data utilized for landing analysis is historical ADS-B data collected and acquired from the Flightradar24 website in 2019. The approach utilized in this study is exploratory data analysis (EDA), in which we explored the dataset to find trusted data (128 tier-1 data points). The results of this study showed that the aircraft that was the object of research was unlikely to land at the Touch Down Zone (TDZ), while the rest showed that its landing was highly likely outside the TDZ.

17

Authors: Olorunfemi Ayodeji OLOJEDE, Sikiru Akintunde FOLORUNSO, Adewale Sheyi POPOOLA, Peter Bolaji OLADEJI, Olamide AKINTIFONBO, Damilare Jeremiah ODEYEMI

The study assessed passengers’ satisfaction with the services of the Lagos Shuttle Train Services in Lagos, Nigeria. Two types of train, the Mass Transit Train (MTT) and the Diesel Multiple Unit (DMU), were covered. Using multistage sampling, 246 passengers were surveyed. It was found that the DMU passengers had higher socioeconomic profiles; the overall condition of the DMU was also better. Further analyses reveal that passengers’ satisfaction differed for the train types: the MTT passengers were more particular about the operational environment, while the DMU passengers were concerned with both physical characteristics and the operational environment. Generally, passengers were satisfied with accessibility, coverage, fare, safety at station and onboard, security at station, and security of luggage; however, the Lagos Shuttle Train Services was found wanting on several key indicators. Recommendations are proffered towards enhancing the service quality of the Lagos Shuttle Train Services.

18

Authors: Leontii MURADIAN, Anzhelika SHVETS, Angela SHVETS

The purpose of the work is to study the influence of the longitudinally-transverse shift of the cargo’s center of mass on the dynamic loading of the wagon in order to solve the problem of predicting the dynamics and stability of an asymmetrically loaded railroad vehicle. During the analytical simulation, a multibody model of the spatial oscillations of the wagon was used. The differential equations of wagon oscillations are compiled using the d'Alembert principle, while the wagon is considered as a system with 42 degrees of freedom. The work presents the results of analytical simulation of some dynamic processes of interaction of railroad vehicles with the rails on the example of flat wagons. The results of the analytical simulation are presented, taking into account the speed of movement along the curved sections of the railway track. The proposed multibody model "heavy cargo – wagon" makes it possible to analytically determine the dynamic characteristics of the system and ensure the development of such methods of transportation of heavy cargo that meet the requirements of train traffic safety. The application of the obtained results will help improve the running safety of freight wagons and enhance the technical and economic performance of railways.

20

Authors: Alireza ANSARIYAR, Mansoureh JEIHANI

The light detection and ranging (Lidar) sensor is a remote sensing technology that can be used to monitor pedestrians who cross an intersection outside of a designated crosswalk or crossing area, which is a key safety application of lidar sensors at signalized intersections. Hereupon, the Lidar sensor was installed at the Hillen Rd - E 33rd St. intersection in Baltimore city to collect real-time jaywalkers’ traffic data. In order to propose safety improvement considerations for the pedestrians as one of the most vulnerable road users, the paper aims to investigate the reasons for jaywalking and its potential risks for increasing the frequency and severity of vehicle-pedestrian conflicts. In a three-month time, interval from December 2022 to February 2023, a total of 585 jaywalkers were detected. By developing a generalized linear regression model and using K-means clustering, the highly correlated independent variables to the frequency of jaywalking were recognized, including the speed of jaywalkers, the average PET of vehicle-pedestrians, the frequency of vehicle-pedestrian conflicts, and the weather condition. The volume of vehicles and pedestrians and road infrastructure characteristics such as medians, building entrances, vegetation on medians, and bus/taxi stops were investigated, and the results showed that as the frequency of jaywalking increases, vehicle-pedestrian conflicts will occur more frequently and with greater severity. In addition, jaywalking speed increases the likelihood of severe vehicle-pedestrian conflicts. Also, during cloudy and rainy days, 397 pedestrians were motivated to jaywalk (or 68% of total jaywalkers), making weather a significant factor in the increase in jaywalking.

21

Authors: Kamil MATRAS, Grzegorz SIERPIŃSKI

The main aim of the research was to diagnose drivers' behavior in urban road traffic. It was preceded by careful observation and testing of drivers' behavior in terms of the violations assumed to be observed. It was taken into account, inter alia, aspects such as failure to comply with road signs and signals, behavior at the rail-road crossing, or offenses occurring in the pedestrian-driver relationship. During the observations, the assumption was to capture negative behaviors of drivers, but each time attention was also paid to positive behaviors related to road culture. The analysis of the results allowed the researchers to identify the most common mistakes made by drivers. This can help not only to better enforce regulations at selected measurement sites but also lead to improved education about these specific violations.

10

Authors: Shohreh MORADI, Grzegorz SIERPIŃSKI, Houshmand MASOUMI

A unified calculating approach is needed for public passenger transportation. All public transport companies and other stakeholders would have additional opportunities to create a transport offer if the unified methodology was made available to them and if calculations and calculation criteria were harmonized. Thus, the main goal – improving citizen mobility – would be accomplished. For this reason, in the study, we suggested the hybrid fuzzy methods for evaluating and improving the quality of public transport service. Unreliable responses of survey participants often distort group decision-making regarding the problem of public services, negatively affecting the end of the calculation procedure. Fuzzy multicriteria decision-making approach has been used. The suggested technique has the advantage of taking into account the degree of fuzzification of respondents' judgments about the choice scenario, while also using two MCDM models to eliminate bias in the responses.

11

Authors: Pavol TARBAJOVSKÝ, Michal PUŠKÁR

One of the main problems of today’s automotive manufacturers are emission norms that are getting much stricter. According to these high demands, car manufacturers are developing new systems to keep exhaust emissions at the lowest possible level. The resonance expansion system for emissions reduction of internal combustion engines could decrease emissions production not only in modern vehicles but also in older vehicles by additional mounting on the exhaust system. This article shows the resonance expansion system technical solution and simulations of fluid flow done in flow simulation software. The resonance expansion system is also patented, and further experiments for design improvement are planned in the near future.

12

Authors: Jure ŠARIĆ, Andrija VIDOVIĆ, Igor ŠTIMAC, Borna ABRAMOVIĆ

In the territory of the Republic of Croatia, not a single airport is connected to the railway infrastructure, which is a limiting factor for the further development of air cargo transport. The traffic network within the catchment area of Franjo Tudman Airport in Zagreb is not sufficiently interconnected, and therefore the implementation of the rules of the single market within the transport sectors is uneven. This paper aims to investigate the factors of intermodality of air transport and other modes of transport, focusing on cases of infrastructure integration in order to improve transport connectivity. The research analysed several airports where increase in cargo traffic was influenced by the expanding capacities and connectivity at the airport. By calculating the coefficient of utilisation of the intermodal surfaces of the reference airports, it was determined that the increase of these capacities does not necessarily lead to a significant increase in air cargo transport. However, due to estimates of the global growth of air cargo transport, an adequate and modernised infrastructure gives an advantage of better positioning in the transport market compared to those airports that do not have such resources. Based on the obtained results and increased investment to improve rail speeds and intermodal accessibility, the modular approach of expanding the infrastructure, through monitoring of cargo transport utilisation coefficient, is considered sustainable.

16

Authors: Elżbieta MACIOSZEK

Rail transport is one of the branches of transport included in the group of land transport, and its operation is related to the transport of people and cargo by means of rail transport on a specially designated railroad built for this purpose. The article presents the classification of transported cargo in rail transport, the characteristics of the rail transport market in Europe, as well as the results of the analysis of the rail transport volume in Poland in 2010-2021. This analysis included an assessment of the following features: mass of transported cargo, performed transport and operational work, the average distance of cargo transport for a group of cargo transported by rail and the volume of intermodal transport. The obtained results allowed to conclude that the transport of goods by rail is systematically increasing. Moreover, intermodal transport is developing well.

17

Authors: Konstantinos MALAGAS, Ridha Aditya NUGRAHA, Sofoklis ALEPIS, Nikitas NIKITAKOS, Rio CHRISTIAWAN, Vicia SACHARISSA

Persons with reduced mobility (PRM) should enjoy the same rights as other people in all life aspects, including in terms of travel experience. PRM group is an undeveloped travel market segment, having specific needs that the aviation organizations should satisfy. The facilitation of air travel for PRM should be supported by, among others, clear standards and appropriate regulations and laws. The present study focuses on the European Union (EU) and ASEAN regulatory framework for PRM, presenting various issues and suggesting improvements. The paper is theoretical in nature. It compares various regulations and laws that are implemented in the two Regions, and from thereafter suggestions are generated. The study shows that the European Union has a more efficient regulatory framework that better responds to the transportation chain and the needs of the various groups of PRM. The ASEAN Region can adopt some functional regulations and practices from the European Region. Also, the emphasis should be moved from persons with disabilities to PRM accompanied by the necessary rules, mainly from the ASEAN side. PRM makes up a significant potential market segment in aviation and relevant studies will be beneficial. The study provides significant insights for the aviation industry, particularly for these two Regions, the various groups of PRM, and the policymakers.

19

Authors: Anna KWASIBORSKA, Krzysztof KĄDZIOŁA

Following the events related to the pandemic and the war in Ukraine, increasing air traffic also increases turnaround agents' activity at airports. Turnaround operations are among the critical activities performed at airports, which must be characterized by punctuality and accuracy of the elementary handling operations. Lack of punctuality in ground handling causes delays in air traffic. On the other hand, a lack of accuracy can also cause disruptions that can turn into aviation incidents. Achieving punctuality and accuracy in aircraft handling is possible by minimizing the resulting disruptions during such handling. The safety management system (SMS) assumes activities to reduce the causes of potential incidents. In the turnaround process, the human factor, the technical aspect, and compliance with existing procedures are significant. The authors have extensively analyzed the disruptions arising during ground handling, learning its causes and effects, which will help avoid adverse events. Occurring disruptions can cause delays in the execution of flight operations but can also cause aviation incidents. Therefore, the authors focused on ground-handling disruptions that can cause adverse aviation incidents. The article presents the interference analysis results as an Ishikawa diagram. Using the FRAM method, an analysis of possible disruptions during the baggage handling process was carried out.

22

Authors: Marta LALAK, Kamil KRASUSKI, Damian WIERZBICKI

Low-altitude photogrammetric studies are often applied in detection of aviation obstacles. The low altitude of the Unmanned Aerial Vehicle (UAV) flight guarantees high spatial resolution (X, Y) of the obtained data. At the same time, due to high temporal resolution, UAVs have become an appropriate tool for gathering data about such obstacles. In order to ensure the required accuracy of orientation of the photogrammetric block, Ground Control Points (GCPs) are measured. The recently introduced UAV positioning solutions that are based on Post-Processing Kinematic (PPK) and Real Time Kinematic (RTK) are known to effectively reduce, or, according to other sources, even completely eliminate the necessity to conduct GCP measurements. However, the RTK method involves multiple limitations that result from the need to ensure continuous communication between the reference station and the rover receiver. The main challenge lies in achieving accurate orientation of the block without the need to conduct time-consuming ground measurements that are connected to signalling and measuring the GCPs. Such solution is required if the SPP code method is applied to designation the position of the UAV. The paper presents a research experiment aimed at improving the accuracy of the determination of the coordinates of UAV for the SPP method, in real time. The algorithm of the SPP method was improved with the use of IGS products.

24

Authors: Milind PARSE, Dhanya PRAMOD

The traffic sign identification and recognition system (TSIRS) is an essential component for autonomous vehicles to succeed. The TSIRS helps to collect and provide helpful information for autonomous driving systems. The information may include limits on speed, directions for driving, signs to stop or lower the speed, and many more essential things for safe driving. Recently, incidents have been reported regarding autonomous vehicle crashes due to traffic sign identification and recognition system failures. The TSIRS fails to recognize the traffic signs in challenging conditions such as skewed signboards, scratches on traffic symbols, discontinuous or damaged traffic symbols, etc. These challenging conditions are presented for various reasons, such as accidents, storms, artificial damage, etc. Such traffic signs contain an ample amount of noise, because of which traffic sign identification and recognition become a challenging task for automated TSIRS systems. The proposed method in this paper addresses these challenges. The sign edge is a helpful feature for the recognition of traffic signs. A novel traffic sign edge detection algorithm is introduced based on bilateral filtering with adaptive thresholding and varying aperture size that effectively detects the edges from such noisy images. The proposed edge detection algorithm and transfer learning is used to train the Convolutional Neural Network (CNN) models and recognize the traffic signs. The performance of the proposed method is evaluated and compared with existing edge detection methods. The results show that the proposed algorithm achieves optimal Mean Square Error (MSE) and Root Mean Square Error (RMSE) error rates and has a better Signal to Noise Ratio (SNR) and Peak Signal to Noise Ratio (PSNR) ratio than the traditional edge detection algorithms. Furthermore, the precision rate, recall rate, and F1 scores are evaluated for the CNN models. With the German Traffic Sign Benchmark database (GTSRB), the proposed algorithm and Inception V3 CNN model gives promising results when it receives the edge-detected images for training and testing.

10

Authors: Bożena SZCZUCKA-LASOTA, Wojciech TARASIUK, Piotr CYBULKO, Tomasz WĘGRZYN

The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.

12

Authors: Fransisca Tiur BASARIA

In response to the COVID-19 pandemic in 2020, PT. XYZ, the biggest aircraft maintenance, repair, and overhaul (MRO) company in Indonesia, implemented a new shift pattern for line-maintenance personnel. The new shift pattern allows maintenance personnel to have fewer working hours per day (7-hour shifts) in more shift varieties for 5 consecutive days. Maintenance personnel will have 2-morning shifts, 1-noon shift, and 2-night shifts followed by 3 rest days. This study aims to explore the risk of fatigue caused by the newly implemented shift pattern. Data were collected through electronic questionnaires from a total of 303 respondents. This study found that at the time of the survey, many respondents (78 of 303, 26%) felt tired and had difficulty concentrating, regardless of the shift they were in. Based on the duty time, the highest scores of level 6 (tired, difficult to concentrate) were discovered on night shift day 5. This result shows that although the organization had provided the maintenance personnel with the opportunity to obtain sleep during rest days, tiredness and fatigue were still experienced by the aircraft maintenance personnel. This study recommends necessary actions to be taken to prevent fatigue, especially from the noon shift afterwards, where fatigue level is increasing, and alertness level is decreasing.

12

Authors: Oleg LYASHUK, Mykhailo LEVKOVYCH, Yuriy VOVK, Ivan GEVKO, Mykola STASHKIV, Liubomyr SLOBODIAN, Yuriy PYNDUS

Research on the influence of geometric parameters of body bottom elements on the stress-strain state (SSS) of the truck with the general application of computer simulation methods was conducted. The nature of the change in static stress and displacement depending on the change in the proportions of the cross-section of the channel at fixed geometric dimensions of the workpiece and the thickness of the workpiece and the bottom material of the body has been studied. Analytical, numerical and experimental methods were used in the study of the stress-strain state of the metal structure of car bodies. Its weight minimization is an important aspect of a truck body design. Because an excess weight leads to increased production costs, reduced payload and reduced fuel efficiency. According to the concept of weight reduction with the provision of a given strength, the body model with variable parameters of the bottom elements is modelled and analyzed. CAD - body models and analysis of the stress-strain state of the channels of the bottom of the bodies have been performed using the software package SolidWorks.

13

Authors: Jaroslaw KOZUBA, Jan PILA, František MARTINEC

With a growing number of coronavirus patients worldwide, military and civilian transport aircraft are increasingly being used for civilian medical evacuation duties (MEDEVAC) on time-critical flights. This article deals with the possibility of converting an aircraft fleet in the Czech Republic to MEDEVAC. The indication for the analysis of the possibility of transforming transport aircraft was the past and current pandemic situation in the Czech Republic. The main research question is how to implement the modification of a selected airline of the Czech Republic to MEDEVAC. An analysis of the technical data of selected aircraft from Airbus and Boeing was used to investigate this problem. Further, an analysis of the medical equipment required for the MEDEVAC aircraft category was also performed using equipment manufactured in the Czech Republic. The results obtained by the analysis and spatial arrangement of the aircraft deck for the transport of patients with medical equipment confirmed the possibility of such a transformation within the Czech Republic. We consider it important to elaborate on a project that would solve, in detail, all the steps of the conversion of a transport aircraft to MEDEVAC.

14

Authors: Vilayat VAILIYEV, Fuad DASHDAMIROV, Azer GURBANOV, Aynura ISMAYILOVA

With the expansion of the use of digital technologies, the nature of almost all service industries has changed. Taxi services are no exception. The use of mobile applications, and the creation of call centres, have simplified the access of passengers to taxis and created a new situation. Despite this, with the emergence of a new situation, new problems appeared. This article aims to study taxi services organization and regulation. Thus, surveys were conducted to study attitudes towards offered services for passengers and drivers, the main participants in the taxi market. The questionnaires are aimed at studying the satisfaction of passengers and the attitude of drivers to working conditions. The total weight of using a taxi in comparison with other types of urban transport is determined. The frequency and main reasons for requests for taxi services were identified. This paper also studied the degree of use of mobile applications for calling a taxi and the distribution of orders between taxi companies. Surveys among drivers were mainly aimed at studying the mode of their work and their attitude to the conditions offered by taxi companies. To solve the identified problems, an appropriate regulation method through a single digital platform was proposed.

15

Authors: Tomasz HANISZEWSKI, Damian GĄSKA, Jerzy MARGIELEWICZ, Tadeusz OPASIAK

This article presents the basic airfoil model with two degrees of freedom - the semi-rigid model, where its forced vibrations were considered, and the exciting force is the aerodynamic force, including its periodic changes, that is, gusts. Since the phenomenological model under study has a coupled form, its versions after decoupling are presented, which has an impact on the results of the final research. The airfoil model presented in this way was shown from the application side in the system of a simple energy harvester based on a deformable beam with piezoelectric elements. The result of the simulation tests is a preliminary analysis of the possibility of using the airfoil as a vibration generator for the energy harvesting system. Along with the application of the mechanical part, a numerical simulation of the electrical part was also implemented, related to the transformation of the voltage generated by piezoelectric elements into a constant voltage signal with a connected receiver with power consumption similar to the Atmega microcontroller with battery charging.

16

Authors: Andrzej HEŁKA, Michał WALL

One of the most critical elements ensuring the proper operation of locomotives are devices that detect and eliminate slipping, especially during the start-up of the locomotive in difficult operating conditions. Various types of slip control systems and methods are used on traction vehicles, depending on the design of a given locomotive and the assumptions made related to the functionality of a given solution. This article describes the PVP-20 type slip detection device used in many older electric locomotives. A proprietary measuring system was developed, enabling it to be connected to the locomotive circuit, to perform measurements in conditions of large disturbances and high voltages prevailing on the electric locomotive. Using this measuring system, the PVP-20 device was tested under operating conditions for the ability to detect slips. It has been shown that the described device is highly insensitive. Hence, we propose our concept for solving this problem.

21

Authors: Zbigniew ŁUKASIK, Aldona KUŚMIŃSKA-FIJAŁKOWSKA, Sylwia OLSZAŃSKA

The current situation in the commodities market has forced suppliers to change their ways of satisfying customer needs. The supply chain aims to deliver raw materials, semi-finished products and finished products to the right place at the right time, incurring the lowest costs. Therefore, high-quality transport services have become indispensable in competing with other entities, enterprises are guided by the timeliness of deliveries in the Just-in-Time and Door-to-Door systems, and the costs incurred. Hence, to ensure that the pursued actions are implemented effectively, it is imperative to apply a process strategy comprising a characteristic component of the transport process management that would have a significant impact on the improvement of the services provided. In this paper, the authors conducted research on a real object of cargo transport on fixed routes and established a concept of streamlining the transport processes carried out at a company. The improvement concept proposed by the authors permits the minimization of the time of loading operations on routes related to a specific load. The result is a reduced total time of cargo transport, which offers the possibility of taking more orders at the studied company.

10

Authors: Michal PUŠKÁR, Matúš LAVČÁK, Marieta ŠOLTÉSOVÁ, Melichar KOPAS

The most serious problems to overcome for a successful operation of the HCCI engine are control of the combustion phase, limited operational range, cold start of engine and high noise level during engine operation. This study aims at describing the engine power output characteristics and emission characteristics of HCCI engines under different testing conditions and the various challenges associated with these engines. Furthermore, this study holds a potential guide for overcoming these challenges and improvement of the engine power output as well as the emission characteristics. Thus, it is possible to say, concerning the performed investigation work, that HCCI combustion can be applied in existing conventional engines after their modifications. The most significant result of the HCCI process application is the reduction of NOx emissions and soot emissions, keeping almost the same engine power output as the conventional combustion process.

11

Authors: Dimitar LOLOV, Svetlana LILKOVA-MARKOVA

Pipeline transport is used worldwide in many sectors of the economy. Its main advantages are continuity of transport, large transportation volumes, small energy consumption, safety, reliability and high environmental benefits. However, the safety problems of pipes attract much interest in science and industry. This paper deals with a cracked pipe with a static scheme of a simply supported beam. It rests along its entire length on a Pasternak elastic foundation. The flowing fluid is considered non-compressible and heavy. The Galerkin method is employed to approach the problem numerically. Conclusions are drawn based on the influence of the crack and the parameters of the Pasternak elastic foundation on the critical flow velocity of the fluid.

11

Authors: Robert ROZENBERG, Marek TOMAS, Alica TOBISOVA, Peter HANAK

The COVID-19 pandemic has affected all areas of our society. The effects of the pandemic on the economy have not only affected mainly the development of transport and tourism but most especially air transport. Many airports in Europe and around the world have experienced a drop in passengers and cargo due to the COVID-19 pandemic. For many airports, this period, which began in 2019, meant huge losses due to a drop in passengers, leading to the collapse of several airlines. Despite the gradually improving situation, the impact of the pandemic is still being felt, and the number of passengers at airports is growing rather slowly. Thus, airports had to deal with the current situation and adapt their future operation to the current conditions. Even the leading airport in Central Europe - the Schwechat Airport in Vienna - was not spared from the effects of the current pandemic. This article aims to evaluate the effects of the COVID-19 pandemic on Schwechat airport. It focuses on the analysis of the development of the airport before and during the pandemic up to the present. Further, this article describes the problems that Schwechat airport dealt with throughout the period, with the loss of passengers, delays and the collapse of carriers. Subsequently, this article is part of a study aimed at identifying the negative effects of the pandemic on air transport and related industries worldwide. Predicting the development of the airport is a very important aspect, especially for the company's management and should be part of the risk management of every company.

13

Authors: Elżbieta MACIOSZEK, Irena JURDANA

For many years in many Western Europe countries, cycling has been associated with not only recreation and tourism but has equally gained an important function as a means of transport used in everyday commuting to work, study and entertainment. The bicycle appears to be a very good alternative to motor vehicles that produce exhaust fumes and create congestion on road transport networks. Not only is the bicycle environmentally friendly and takes up little space in road transport networks, but also, the time of bicycle travel is often competitive in relation to travel made by private car or public transport. This article presents the characteristics of the bicycle infrastructure and services offered in selected cities in the world and Poland, as well as the issues of bicycle counters as sources of data on bicycle traffic volume, along with an exemplary analysis of this type of data.

14

Authors: Miroslav BLATNICKÝ, Ján DIŽO, Denis MOLNÁR, Paweł DROŹDZIEL

The predominant goal of the research presented in this paper is the design of a manipulator for a conveyor of bulk materials based on the given requirements. This issue is an emerging topical one mainly for the reasons of increasing efficiency and speed, as well as the safety of maintenance of machines and equipment. Especially, another essential aspect is the reduction of the physical strain on operators during service operations on the conveyor of bulk materials. The introductory part of this paper attends to the materials used for the production of steel structures, their technological processing, as well as different types of joining of their components. The practical part was set out to ascertain the mass and position of the center of gravity of the load itself – the conveyor. From the perspective of acting, it loads the entire proposed structure, although in different operating modes.

15

Authors: Wieslaw PAMULA, Marcin Jacek KŁOS

Traffic surveillance provides crucial data for the operation of intelligent transportation systems. The growing number of cameras in the transport system poses a problem for the efficient processing of surveillance data. Processing of video data for extracting traffic parameters is usually done using image processing methods and requires substantial processing resources. An alternative way is to transform the video stream and map the traffic parameters using the obtained transform coefficients. Spatiotemporal wavelet transform of the video stream contents, using filter banks, is proposed for mapping traffic parameters. Performed tests prove good resilience to illumination changes of road scenes. Mapping errors are smaller than in the case of the commonly used video detectors at sites on multilane roads with low to moderate traffic load.

19

Authors: Marzena PIOTROWSKA-TRYBULL, Jarosław KOZUBA, Stanisław SIRKO

Research presented in this article was undertaken to determine how representatives of authorities and residents of communes perceive airports in the context of the impact of these airports on the socio-economic situation in the communes. The goal was achieved using: analysis of documentation of communes, analysis of data on the functioning of airports, and a diagnostic survey using the interview technique and survey technique. The research was carried out on representatives of 5 communes located in Poland. To analyse the collected material and present the results, Statistica v.13.3, R v.4.0.0 and RStudio editor software were used. Results of this research proved that airports play a pivotal role in stimulating the development of the region. They influence the quality of life in the commune by contributing to the creation of jobs, attracting investors, and generating income for the municipal budget through taxes paid.

21

Authors: Marianna JACYNA, Renata ŻOCHOWSKA, Aleksander SOBOTA, Mariusz WASIAK

This article presents the issue of using decision support tools to select the variant of organization of urban transport system. Two scenarios for the use of electric vehicles were compared, considering not only their emissions and fuel consumption but also the limited accessibility of conventional vehicles to the city. The authors assume that the development of urban traffic organization must go hand in hand with the challenges of planning sustainable urban mobility and reducing harmful exhaust fumes. Furthermore, decision-makers should be equipped with simple decision support tools to generate the best option considering the expectations of transport users. The PTV VISUM tool was used to analyse and visualize two different organization scenarios for a selected city in Poland.