Scientific Journal of Silesian University of Technology. Series Transport

8

Authors: Leszek MINDUR, Maciej MINDUR

The excessive increase in transport intensity is one of the negative impacts on the economy. The costs borne due to transport activities are indirectly expressed by the volume of carriages (in tons) and by the scope of transport activity (in ton-kilometers). The result of social and economic activities are global product values and national incomes. This article shows the research on transport activity expressed through transport activity (in ton-kilometers) for all means of transport in total, the results of social and economic activities expressed using the gross domestic product, as well as shaping transport intensity of national economies in selected European countries. The analysis of the course of the exponential function curves, as well as polynomial curves has been carried out, and conclusions have been formulated on their bases.

10

Authors: Radka JÍROVÁ, Lubomír PEŠÍK

Vibroisolation systems of base desks for machine and testing facilities usually cannot effect efficient changing of their own frequencies according to operating conditions. Especially in the case of the automotive industry, the possibility of changing natural frequencies is very desirable. During varying operating conditions, the vibroisolation system needs to be regulated easily and quickly regarding the minimisation of dynamical forces transmitted to the ground and to ensure the stability of the testing process. This paper describes one of the options of tuning the base desk at a relatively short time and by sufficient change of own frequencies, which decides the dynamical behaviour of the whole system.

11

Authors: Elżbieta MACIOSZEK

Transport plays an important role in the economy of any country. Efficient and developed transport infrastructure of various modes of transport significantly affects the availability of transport services, and consequently, the well-being of citizens. This article presents an analysis of the volume of passengers and cargo transport using rail and road transport in Poland in 2009-2019. These analyses were carried out based on data obtained from the Central Statistical Office. All data concerns Polish entities that provide services in the field of passenger and freight transport in Poland and focuses on such information as the volume of passengers and cargo by individual means of transport, broken down into domestic and international transport. Further, the presented analyses concern the length of the available rail and road routes, tracks, the size of the rolling stock as well as the groups of transported loads.

12

Authors: Siarhei AZEMSHA, Irina KRAVCHENYA, Yuriy VOVK, Oleg LYASHUK, Iryna VOVK

Schedule optimization is a proven strategy to improve service quality for public transport networks. However, current research mostly optimizes schedule design using prior knowledge of users’ routings, ignoring the optimization of public transport schedules on duplicating stretches of route vehicles. This article presents a new alignment technique of time intervals between consecutive vehicles of different routes on duplicating stretches, considering existing public transport networks in attaining optimization of public transport schedule. Scheduling technique of route vehicles on duplicating stretches includes some steps: analysis of public transport network and determining a lot of duplicating stretches, calculation of the optimal time intervals among arrivals of route vehicles and alignment of these intervals among consecutive route vehicles on duplicating stretches, realization simulation model of urban passenger transport within the simulation modeling system of GPSS World. Furthermore, testing the optimization technique of route vehicle scheduling, analysis of the quality of adjusted schedule with route vehicles of different kinds included, and determining the optimization efficiency for duplicating stretches. The adjusting technique of urban passenger transport schedule allows to increase movement steadiness of consecutive vehicles of different routes on duplicating stretches, adjust traffic intervals for each route, shorten the traffic load on stations, reducing idle time and queue lengths of route vehicles in front of transport stops and also minimize waiting time for route vehicle by those passengers who can be transported along several routes. Improving the bus schedule on duplicating stretches in Gomel is illustrated demonstrating the technique developed. This scheduling technique can be used by carriers and transport operators to improve the quality of services provided.

13

Authors: Mulugeta GIRMA, Berhanu WOLDETENSAE

Due to its low fares, public bus transportation as a means of urban road mobility is a popular choice, particularly among city inhabitants. However, owing to its high level of crowdedness, it poses a greater risk of security and safety, particularly during peak hours. Moreover, passengers have continued to voice their dissatisfaction about the services offered, as well as the criminality that occurs in the station and on the bus. The problem is exacerbated in developing countries due to increased travel demand and a lack of appropriate and integrated solutions. Consequently, the purpose of this study is to evaluate commuters' perceptions of their concerns about using public bus transportation in the city, with an emphasis on security and safety in bus operations. A questionnaire survey was used to obtain data from 500 users in the city for the study. Using the SPSS software, the data was analyzed. To find out what they think, a descriptive analysis was used. Overcrowding of buses, personal insecurity, and infrequent bus service are the three biggest concerns in using public bus transportation in the city, according to the results. Furthermore, most of the respondents were concerned about crime; specifically, pickpockets, inappropriate touching, and disrespectful language of drivers and conductors are the three top types of crime that concern passengers who use public bus transportation in the city. Additionally, most people felt more insecure while riding the bus and getting on/off the bus, particularly in the evening and between 9:00 and 12:00 p.m. local time. Thus, it is advised that the Addis Ababa City Transport Authority, the Public Bus Transport Enterprise, and other interested parties place a strong emphasis on security and safety when providing public transportation in the city. Furthermore, it is critical to perform regular victim surveys of passengers (as well as operators) to establish whether they have been criminally victimized on the bus system and by what type of crime. Equally important, regularly assess the likely usefulness of new crime prevention measures for reducing bus-related offenses and prepare an annual bus crime reduction strategy.

14

Authors: Zbigniew STANIK, Andrzej KUBIK, Damian HADRYŚ, Csaba CSISZÁR

This article presents two methods of testing bearing hubs, which may supplement the existing subjective and unreliable methods of diagnostics of rolling bearings used in wheel bearing hubs of motor vehicles and other means of road transport. One of the most important elements responsible for the safety of a vehicle is the bearing hub. Regular monitoring of the technical condition of bearings should become an obligation at vehicle inspection stations when carrying out a technical inspection of a vehicle, authorising it to travel on public roads. This article presents the results of vehicle tests with signs of damage to rolling bearings, using two test stands: one on which the dynamic balancer acted as a device for accelerating the wheel, and the other, which was designed as a test dedicated to automotive rolling bearings, where a dynamic weighbridge was used as the wheel drive, made it impossible to test the wheel at lower rotational speeds. The newly designed and manufactured bearing testing device eliminates the disadvantages of the previous stand, and additionally, enables the measurement of a fully loaded bearing hub, which enables the simulation of real operating conditions on the bearing hub.

15

Authors: Monika BLIŠŤANOVÁ, Michaela KEŠEĽOVÁ, Ľubomíra BRŮNOVÁ

Safety is generally characterised as the state of being “safe”, the condition of being protected from harm or other non-desirable consequences. One effective way of achieving it is to implement a safety management system (SMS). SMS should be seen as an aggregate strategic aspect of standard business management, understanding its high priority to safety. This article describes and illustrates SMS in aviation, focusing on the similarities and differences in the system approaches adopted by selected Civil Aviation Authorities (CAAs) with the primary focus on the safety level. The main goal is to provide a structural comparison of the system framework within individual CAAs and its explanation in safety-related documents. This article also dealt with the chosen safety approach (reactive, proactive and predictive) and safety performance indicators (SPIs), forming a quality and effective safety system that maintains an acceptable safety level. Finally, this article is mainly based on datasets publicly available through the International Civil Aviation Organisation, Transport Canada, Civil Aviation Safety Authority Australia, Federal Aviation Administration, UK Civil Aviation Authority, Civil Aviation Administration of China and Civil Aviation Authority of New Zealand websites and documentation related to safety.

16

Authors: Piotr GORZELANCZYK, Ida POLAK

The main purpose of this article is to make a forecast of the load on the night lines using the Municipal Transport Company in Piła (MTC) as a case study. This article characterizes the concept of urban logistics and mobility, and then proposed a mobility model that considers the preferences of residents when choosing a means of transport. Finally, it ends with a survey and the appropriate conclusions drawn.

17

Authors: Vladimir SHPACHUK, Aleksandr CHUPRYNIN, Tatiana SUPRUN, Andriy KOVALENKO

Mechanical models of a transport system “carriage - track” while crossing a joint irregularity are proposed. An investigation was conducted on the peculiarities of static, shock and dynamic interaction between the four-axle car and the track, considering tram wheelsets motion features over joint irregularity. A method to solve the equations of a mathematical model of static, shock and dynamic interaction is developed. Numerical analysis is used to determine deflections of the facing rail under the first sleeper for each phase of motion depending on motion phases, and car load and speed.