Scientific Journal of Silesian University of Technology. Series Transport

6

Authors: Jakub KIEDROWSKI, Grzegorz JENDRO, Arkadiusz KAMIŃSKI, Paweł FABIŚ

This paper is a summary of the design and workmanship of the aero package vehicle Formula Student. Simulation research projects of the aerodynamic system were conducted. The article proposes different variants of the aero wings and conducted simulation studies of construction. The aerodynamics system impact on strength and reliability of selected models was determined.

8

Authors: Sławomir KOWALSKI

The everyday use of the bicycle is becoming increasingly common. People noticed the need to take care of both their health and the environment. The geographical location of Poland encourages cycling, which is the reason new kilometres of cycling routes are being built every year. This is associated with the rising interest in buying a bicycle. A conceptual tricycle with an additional electric drive powered by solar panels is presented in this article. The photovoltaic panel is installed on the basket roof. The electric motor may be used during an uphill ride and when the driver has run out of energy for pedalling. In the crank mechanism, there is a sensor which starts the motor when a small foot pressing force on the pedal is detected. The tricycle has an all-purpose structure, owing to which the seat mounted in the basket can be easily replaced with a double seat, a shopping bin or a child's safety seat. The tricycle may be used by both private persons and companies involved in tourist transport. The cost of the structural details of the tricycle suggested in this article does vary considerably from standard electric bikes, however, that solution has several important advantages, which may be decisive in the purchase of this solution.

10

Authors: Kamil MACIUK, Yuriy RUDYK

Currently, global navigation satellite systems (GNSS) play a key role in the broad field of security and human life. In principle, almost every area of human activity (for example, mining, energy or construction) systems related to saving human life are introduced. Generally, satellite navigation is an indispensable element of this type of systems. In this paper, authors present basic principles of the GNSS operation and the current state of knowledge about usage of the global navigation satellite systems in the area of safety, protection and rescue issues.

11

Authors: Andrzej HANUSIK

There are many new concepts for doing business in the modern market. Carsharing is one of such models that are directly related to the sharing economy. The current body of literature shows an absence of reports about risk management in carsharing operators. Further investigation of scientific databases confirms the existence of a research gap in this field. The purpose of this article is for identification of risks in carsharing and their latter assessment in terms of probability of occurrence, impact on customer relationships, the importance of a given category and the cost they generate. A way of aggregating various categories of risks into one synthetic indicator to prioritise them was proposed. The methodology of the process was based on a methodological triangulation which is established on the following studies – analysis and criticism of literature which helps to place discussed research problems on a theoretical basis, qualitative research and observations allowing to identify individual categories of risks and quantitative research enabling the description of given categories of risks by appropriate variables on which further risk modelling is performed. Such research may be a basis for subsequent analysis and an impulse to an academic debate. Besides, it may contribute to the creation of further studies, which deal with the problem of assessment of the risk in concepts related to sharing economy.

11

Authors: Adalat PASHAYEV, Elkhan SABZIEV

Errors in the calculation of the parameters of quadcopter control models at design stage significantly change the desired aerodynamic properties of the drone and make it difficult to control its flight along the intended path. Therefore, to calculate the adequate operation modes of the blades, it becomes necessary to refine some parameters of the mathematical model of the drone as accurately as possible. This paper shows the possibility of using control parameters (rotational speed of the blades) and information received from navigation devices of the drone to refine the values of the parameters of the mathematical model of the drone. For this purpose, a mathematical model of a quadcopter is built, and the problem of refining the parameters of its dynamic model is investigated based on the information received from navigation devices and the control parameters in the initial period of its flight. From the results obtained from several consecutive measurements, a system of equations expressing a mathematical model is solved. The mean value of the corresponding solutions of the system of three-dimensional linear equations obtained at different time intervals is the refined value of the parameters.

12

Authors: Mohammad Mehdi KHABIRI, Pooya AFKHAMY MEYBODI, Abolfazl AFSHARI

Sidewalks play a very important role in the dynamism maintenance as well as the development of cities especially historic cities. To ensure the maintaining service quality of sidewalks, the first step is to prevent distress occurrence, thereafter repair the distress that occurred in the sidewalks. In historic cities, the lack of suitable sidewalks for walking led to the gradual elimination of pedestrians. Yazd is a historic city recorded as a world heritage site by UNESCO, which attracts many tourists from all over the world every year. Therefore, preserving the quality of sidewalks in this city is of great importance. In this research, the SCI method was used to investigate the condition of the sidewalks in the studied area. This method is similar to the pavement condition index (PCI) method. The results showed that the condition of sidewalks in the studied area is in the range of 55-70, which is relative.

12

Authors: Eva NEDELIAKOVA, Lenka LIZBETINOVA, Renata STASIAK-BETLEJEWSKA, Adrian SPERKA

Despite constant efforts to improve safety in the railway environment, various accidents and incidents happen, resulting in material damage and in the worst case, loss of human lives. This article emphasises the need for proper identification of risks, their constant monitoring, and evaluation of all causes that arise at railway crossings. Furthermore, this paper aims to apply the Reason model to the problems of railway crossings within the case study on the railway network in Slovakia. The timeliness of the problem lies in the possibility of preventing such issues in the operation of rail transport using this model. Prevention is an effective way of averting the serious consequences of accidents in the future.

14

Authors: Marek RUTKOWSKI

This work focuses on several aspects of water-related transportation laws as well as drainage law introduced in the Kingdom of Poland before 1860. Thus, while focusing on a) laws concerning the removal of diverse type of obstacles from the rivers used for official navigation; b) establishing of riverside towing routes; c) construction of rivers verst signs on the river banks, this research also deals with the introduction of provisions concerning draining and receiving of waters, which had a huge impact on the road construction and maintenance process in Poland for the first half of the 19th century.

22

Authors: Faysal Ibna RAHMAN

For transport planning and policy-making, visualising the relationship among attributes; gender, education, occupation, age with travel pattern and mode choice is important. Household Interview Survey (HIS) is one of the major inputs in transport study which contains information about travel and demographic characteristics. From the analysis of 28,235 households in Dhaka city, this study represents the social demographic characteristic of Dhaka city based on the household survey. It was found that 89.79% of dwellers make double trips in a day and the trip rate per trip maker is 2.16, where 14% of total trips are generated at morning peak time between 7 to 8 am. The bus is the most preferable mode share and its contribution is about 35%. The scenario changed in a multimodal trip case and walking was the domination mode share with about 45% of total trips. Vehicle ownership had a vital rule in particular mode choice, especially in car and motorcycle household ownership case. Significant impact on travel patterns and mode choice criteria was found with gender, education, occupation, age, household income, trip purpose and time and vehicle ownership, which can help to formulate the strategic plan to solve the transport-related problem in Dhaka.

7

Authors: Milan DRBAL

The rotary engine mainly developed for the automotive industry by the NSU corporation is currently used in unmanned aircraft, transportable generators and small watercraft. In the early stage of the engine development, the simulation of the performance characteristics is advisable. The 3D CFD engine simulation is highly expensive in terms of CPU time demand and requires a high level of optimisation to provide adequate data. This method can be used later in the development and fine engine tuning. For the design of the prototype 1D, simulation is being used as a tool to compare various designs of the engine. While the current commercially available software (GT-suite, Ricardo Wave, etc.) is being improved marginally, the functionality of the software is being tested on the piston reciprocating engines. This paper explores the possibility of the algorithms of such a software to be used on the rotary engine thermodynamic simulation and provides an approach to design a simulation model that can be solved by the software to predict the performance characteristics of the engine prototype.

8

Authors: Elżbieta MACIOSZEK

Transport of oversize cargo is a specific form of transport service. Specialised equipment is required for its implementation, while the number of people involved in the transport process itself is much higher than in the case of classic road transport form. This paper presents the problems related to permits and penalties that are used in the carriage of oversize cargo and the problems of transport safety in relation to the techniques of fixing oversize loads in road transport.

10

Authors: Jacek CABAN, Paweł DROŹDZIEL

The dynamic development of motoring observed in the last two decades contributes to many negative phenomena occurring in road transport. Distinguished among these negative phenomena are high share of car traffic, road accidents, emission of toxic exhaust fumes into the atmosphere, etc. For these reasons, many initiatives are taken in the field of road transport management and city logistics. Traffic problems are solved from many aspects, such as the development of transport infrastructure, changing of urban transport organisation, parking organisation in city centre and Park & Ride system, as well as the progress of alternative means of transport. The problem of traffic congestion in urban areas is still a current topic. This article presents the formation of congestion in urban areas in chosen big cities in Poland. The first part of the article deals with the theoretical issues of traffic flow and congestion formation in the city road networks. The second part of the article outlines the situation of transport congestion with these cities based on the worldwide TomTom Traffic Index within the period of 2008-2016. This study is a brief analysis of the trends relating to the transport congestion based on the TomTom Traffic Index in Polish cities, which will allow future researchers a wider study of this problem. The authors suggest some solutions to reduce the level of transport congestion and harmful emissions from means of transport.

10

Authors: Małgorzata KIRSCHENSTEIN, Kamil KRASUSKI, Artur GOŚ

This article presents the results of research concerning the determination of an error of the vertical position of an aircraft during a flight, taking into account, the flight altitude and the values of the ZTD tropospheric product. In particular, this work focuses on the impact of an error in designating the ZTD tropospheric product on the correct determination of a flight altitude. The authors of this work performed a scientific experiment for research data of two flights made by a Cessna 172 around the aerodrome in Dęblin. This article shows the findings of the tropospheric ZTD product specified for the single-frequency SPP positioning method and dual-frequency PPP positioning method. Based on the obtained results, it was discovered that the error of the ZTD tropospheric delay causes an altitude error from 0.08 m at the zenith angle equal to 80o even to 0.79 m at the zenith angle equal to 85o.

11

Authors: Jędrzej ŁUKASIEWICZ

The purpose of this work is to demonstrate the advantages and disadvantages of unmanned aerial vehicles as devices supporting the system of physical protection of critical infrastructure facilities using the example of a nuclear power plant. This paper contains information on the reasons for the construction of a nuclear power plant in the era of economic development of the Polish state. The legal requirements consisting of the analysis of the risk of terrorist threats for the facility was indicated. One of the sources of danger is unmanned aircraft or flying models increasingly used in the airspace. Furthermore, this paper presents legal rules and principles according to which missions of unmanned aerial vehicles or flying models are performed. The current regulations allow the use of unmanned aerial vehicles as devices supporting physical security systems at facilities. This study showed that although the use of unmanned aircraft for the purpose of increasing the security level of critical infrastructure facilities has some limitations, however, the possibilities arising from their usefulness are the decisive advantage of the need to implement drone technology in security.

12

Authors: Marcin RUTKOWSKI

The competitive advantage of the passenger air transport market is a significant part of airline operations. An important element, a condition that may determine the achievement of competitive advantage, is the issue of safety, which also applies to the operation of aircraft. An example of creating an effective competitive advantage may be the operation of a new aircraft by air carriers. This article presents the process of creating a competitive advantage on the example of the Airbus A350 XWB and the Boeing 787 Dreamliner aircraft considering the safety aspect, which in the case of new means of transport in civil aviation may primarily concern the seeming childhood diseases occurring in the initial use of new aircraft. This article, in the form of comparative analysis, indicates the key features that determine the attractiveness of the new aircraft as a product on the passenger air transport market. Secondary data on the characteristics of the Airbus A350 XWB aircraft were used and compared with the data of the Boeing 787 Dreamliner to illustrate the properties that may indicate the manufacturer's superiority. Furthermore, this article proposes a scheme of creating competitive advantage in passenger air transport, which can be a model for creating a competitive advantage in civil aviation. The close relationship between the economic and technological aspects in creating competitive advantage was buttressed as well. This article also analysed secondary data related to the number of ordered and used aircraft and aviation events registered on the website: https://aviation-safety.net [8], which could have an impact on the level of safety of flight operations. Brought to the fore were situations in which the seeming childhood diseases in aircraft operated by the American manufacturer, Boeing 787 Dreamliner, such as defects in engines, power elements and risks associated with the use of composite materials, which were first used on such a large scale in the construction of wide-body aircraft.

13

Authors: Valery KURGANOV, Mikhail GRYAZNOV, Kirill DAVYDOV, Liliya POLYAKOVA

This study is aimed at improving the methods of carriage of passengers by urban transport to improve its reliability and efficiency. It can be achieved by forming back-up bus routes within the existing regular route network for servicing mass passenger-flows. This study theoretically substantiates the impact of back-up bus routes in the current regular route network on the reliability and efficiency of the transport process. Mathematical models of reservation of regular route network and the assessment of the reliability of passenger transport using different reservation schemes are suggested. Methodological recommendations on the formation of passenger traffic on back-up bus routes and cost reduction on its maintenance, by managing the route speed depending on the loading of the city road network, have been developed. Technical and economic evaluation was conducted to the developed methodological toolkit.

18

Authors: Martin MANTIČ, Jozef KUĽKA, Melichar KOPAS, Eva FALTINOVÁ, Leopold HRABOVSKÝ

This paper describes a question of evaluation necessity of bridge cranes using the method of limit deformation state and oscillation damping. The solution was performed by means of theoretical analysis and an experimental verification at the selected bridge crane. The final result sounds that in the case of a correct strength computing of given bridge crane, it is not necessary to also check deformation and damping of oscillation as well.

23

Authors: Melika MEHRIAR, Houshmand MASOUMI, Katarzyna NOSAL-HOY

Urban sprawl is considered as a western urban development pattern, which is common in different cities around the world. Although, a large number of studies have focused on urban sprawl, modelling urban sprawl has been less emphasised, especially in various geographical contexts. This study aims to investigate urban sprawl and its determinants in a post-socialist country and model urban sprawl based on disaggregated data. In addition, the correlations of urban sprawl with travel patterns were examined, along with the socioeconomic characteristics of university students in Cracow, Poland by applying the Weighted Least Square (WLS) regression model. The WLS regression model was fitted based on the data from 1,288 online questionnaires targeting university students. Furthermore, urban sprawl around the home and the university for each student who indicated the nearest intersection to their home and university were separately estimated by employing the Shannon entropy. Based on the findings, urban sprawl around homes was correlated with 14 transport patterns and socioeconomic features such as gender, age, driving license, financial dependency status, gross monthly income, number of commute trips, mode of transportation for commuting, number of trips for shopping or entertainment, daily shopping area, mode choice for shopping and entertainment trips inside and outside the neighbourhoods, frequency of public transport use, the attractiveness of shops inside the neighbourhoods, and the length of time living in the current home. Additionally, urban sprawl around the university was significantly correlated with age, car ownership, number of commute trips, and a sense of belonging to neighbourhoods, entertainment place, and residential location choice. Finally, a positive correlation was reported between urban sprawl with higher income, elderly student, financial dependent students, and car dependency trips, while urban sprawl was negatively related to the use of public transit.

6

Authors: Daniel-Cornel ŞTEFĂNESCU, Alina PAPOI

Globalisation brought an electronic communications reliance, as well as some repercussions on the world’s states, mainly in the sphere of cyber security. In recent years after the events in Ukraine, the cyber threat became a certainty and risk. We must be conscious that cyber attacks will grow up considerably, and one of their forms is the hybrid war, with its conventional and non-conventional, military and non-military capabilities. The emergence of a new battlefield – the cyberspace – is a reality, where military operations are carried out through sophisticated technology. For this purpose, states need to increase their cyber defence capabilities to prevent and combat aggression from the virtual environment to critical infrastructure, communications systems, and last but not least, the people.

7

Authors: Anna WÓJCIK

The progressing automation of maritime transport, including the introduction of autonomous and/or unmanned ships, calls for the development of communication principles, particularly conversations currently carried out verbally. The work in this field is intended to improve the safety of maritime transport. This article describes research on automatic communication in the form that will support navigators responsible for ship conduct. The processes of inference and conversation management are described. The developed methods are based on standard marine communication phrases. The presented example conversation between navigators is supported by an automatic communication system. The work herein described aims at the creation of procedures for communication at sea between autonomous ships.

11

Authors: Leopold HRABOVSKÝ, Gabriel FEDORKO, Lukáš MLÝNEK, Peter MICHALIK

This paper contains the design of a testing device, which was constructed for the purposes of checking functional properties of the innovative solutions of variants of electromagnetic locking devices with potentials of replacing current mechanical brakes used for stopping pallets with loaded cars in parking houses developed by the company KOMA - Industry s.r.o. The testing device consists of two positioning tables, whose moveable parts are anchored perpendicular to each other in the frame of the testing device. An electromagnet and a solenoid generating the force needed for stopping the motion of the pallet is connected to the moveable part of the upright positioning table. The brake ramp made of a ferromagnetic material has a hole at its top surface into which the pin of the solenoid is inserted and is attached to the horizontal moveable part of the positioning table. This paper presents holding force values of the electromagnet, which were obtained by experimental measuring on the created testing unit.

11

Authors: Marek RUTKOWSKI

In May of 1844, more than twenty years after taking the first steps in the field of regulating watercourse transportation issues, the new law introducing strict water transportation measures in the Kingdom of Poland was accepted by the Russian Tsar. These new proposals, though seen as practically harsh and difficult, for instance, possibly limiting the opportunity of obtaining compensation payments might have given some new strong impulses for the development of Polish water transportations issues as a whole.

12

Authors: Elshan MANAFOV

This paper is devoted to the development of an effective system for monitoring the technical condition of the axle boxes of rolling stock. To this end, the possibility of solving problems of fault diagnostics based on the theory of fuzzy sets is considered. This allows one note such difficult-to-formalise factors as experience and intuition of a highly qualified expert specialist. It showed that an expert system-based monitoring approach allows evaluation of the technical condition of the axle boxes, characterised by internal and external operating uncertainty. It also proposed the use of parameters such as vibration and noise for comprehensive monitoring of the technical condition of axle box units together with temperature. Furthermore, the combination of these diagnostic parameters and expert system’s possibility to receive all necessary information about the condition of the most critical components of the axle boxes in real-time and analyse the changes in their operational parameters was explored. The stages of modelling an expert system in the Fuzzy Logic Toolbox package of the MATLAB computing environment are presented.

13

Authors: Artur ANDREARCZYK, Paweł BAGIŃSKI

This article presents the vibration analysis of a turbocharger, whose compression wheel was manufactured using a high-precision additive manufacturing technology. Currently, there are advance studies around the world for the development of parts of innovative fluid-flow machines using additive manufacturing techniques. The experimental research was carried out under conditions of reduced flow temperatures. The tests and the analysis were performed on a wheel manufactured using a 3D printing technology and on a conventionally used aluminium wheel. Apart from an FFT analysis of the vibration signal during machine operation, a machine run-up test was conducted (up to a speed of 105,000 rpm). The results showed the positive impact of the use of a plastic wheel on the dynamics of the system at a certain speed range, which might contribute to the development of a new method to optimise the geometry of flow systems in small high-speed turbomachines. A modified automotive turbocharger was subjected to experiments on a test stand.

14

Authors: František SYNÁK, Vladimír RIEVAJ, Matej KUČERA, Milan ŠEBÖK, Tomáš SKRÚCANÝ

The friction brakes convert a significant part of a vehicle’s kinetic energy into thermal energy. Some of its parts is distributed to the places around the brakes, and another part is accumulated in several vehicle components. This article is focused on the measurement of temperature increase of selected vehicle components during re-deceleration. These components include brake discs, brake pads, calliper, wheel rim and tire side in the area of its bead and tread. The measurements were performed during the repeated braking of a fully-loaded vehicle according to ECE Regulation No 13 - type I.

18

Authors: Michal PUŠKÁR, Melichar KOPAS, Dušan PUŠKÁR, Marieta ŠOLTÉSOVÁ

This article analyses the influence of various configurations concerning the homogenisation system on the output parameters of an experimental engine. The results presented in this article were obtained using experimental dynamometric measurement. A modular approach to the individual measurements consists of a sequential formation of the homogenisation system configurations. The experimentally obtained results are matches with the analytical relations, which are described in the related literature. These results can be presented for a wide spectrum of high-powerful engines because the homogenisation system does not depend on the construction and design arrangement of the engine itself. The analysed system was successfully applied in the motorcycles and it is a subject of the patent application.

7

Authors: Bożena SZCZUCKA-LASOTA, Tomasz WĘGRZYN, Bogusław ŁAZARZ, Adam JUREK

In the construction of mobile platforms, there is an increasing necessity to weld steels from the AHSS group (AHSS - Advanced High-Strength Steel) with low-alloy steels. This article verifies the possibility of obtaining accurate mixed welded joints from different grades of AHSS steel with S355J2 steel. The structure, as well as mechanical properties of the obtained welded joints, were thoroughly analysed.

9

Authors: Adam MAŃKA, Andrzej HEŁKA, Janusz ĆWIEK

This article presents the results of studies on the impact of the percentage of copper in the carbon composite of the railway pantograph contact strips on the maximum temperatures of the contact wire of the overhead contact line. The tests were carried out in accordance with the requirements of standards [7, 9] and TSI [4]. The obtained relationship allows for an initial assessment of the introduced materials due to the contact wire heating criterion based on the copper content of the carbon composite, which greatly facilitates the design process and the initial assessment of the pantograph slides performance. This publication also indicates the minimum value of the percentage of copper at which the standard requirements [7] for railroad wire heating are still met.

9

Authors: Ján ŠTEININGER, Slavomír HRČEK, Lukáš SMETANKA, Rudolf SKYBA

This article deals with an optimisation procedure of inner geometry of rolling elements designed for spherical roller bearings. A process of selection of the most appropriate solution to increase spherical roller bearing durability is understood under the term optimisation in this case. The aim of this article is to examine the impact of a change of inner geometry on the durability and reliability of spherical roller bearings regarding production technology and competitiveness. Contact strain along with a spherical roller by means of Finite Element Method (FEM) in contact points of components of a spherical roller bearing by means of designed 3D parametric models. The most appropriate shape of inner geometry of a bearing from the standpoint of calculated durability will be determined based on the results of analyses.

10

Authors: Ewa KARDAS-CINAL

This paper investigates the variation of track geometrical parameters that lead to a local increase of specific dynamical quantities of a railway vehicle, possibly beyond their acceptable values. In particular, the changes of track geometry are investigated near track points where the running safety or ride comfort are significantly decreased during the vehicle motion due to track irregularities. The investigated dynamical quantities include the lateral and vertical forces at the wheel-rail contact as well as the acceleration of the vehicle body. The vehicle motion has been simulated using a non-linear model of a passenger car moving along a nominally tangent stiff track with random geometrical irregularities. The relationship between the local track condition and the maxima of the dynamical quantities was investigated with the statistical method proposed by the author. The performed analysis clearly identifies the characteristic variation of track irregularities that leads to a large increase of the investigated dynamical quantities at some track points.

11

Authors: Radka JÍROVÁ, Lubomír PEŠÍK

Welding production lines are indispensable parts of the production processes in the automotive industry. In many cases, the production line operation is ensured by equipment with linear conveyors or robots, wherein linear guiding systems are basic elements of these manipulators. The failure of some linear guiding system may lead to significant production losses. Hence, the knowledge of their operating loads is necessary to determine very exactly. The objective of this article is to identify and verify the basic dynamic parameters of the welding manipulator, as a starting point for the operating loads calculation of linear guiding systems. This issue was solved by combining the measurement of kinematic values and MBS (Multi-body System) analysis in case of the concrete linear welding manipulator, which was the main part of the observed welding line. We have measured time values of acceleration in defined points of the manipulator and evaluated them by FIR (Finite Impulse Response) filter, FFT (Fast Fourier Transformation) analysis and ODS (Operating Deflection Shapes) analysis. The obtained frequency spectrum showed oscillation frequencies, which could be compared with frequencies of the manipulator dynamical model by different mass and stiffness parameters. In this way, the dynamic parameters of the welding manipulator can be identified and used for the next calculations and simulations, where loads of linear guiding systems will produce very important results.

12

Authors: Grzegorz KUNIKOWSKI

In numerous definitions of energy security, an approach, which emphasises the importance of continuity of supply dominates. It takes into account the need for diversification and signals the necessity to protect the environment and keep energy costs under control. Noticeably, energy security is not only an issue of the state in strategic dimension, but it also embraces the management issues that can be comprehensively described through a classical, multi-level management approach using: strategic and operational levels. Furthermore, security in the dimension of needs is a response to threats. Therefore, the taxonomy of threats concerning the energy sector facilities may be useful in defining energy security in terms of management. This article is an attempt to define the features of energy security as a response to threats, within strategic, operational and tactical dimensions. The proposed herein approach aims to manage energy security in the scope of a diagnosis, an assessment, and taking action, as well as monitoring the current state.

12

Authors: Vladimir SHPACHUK, Aleksandr CHUPRYNIN, Vasily DALEKA, Tatiana SUPRUN

Mechanical and mathematical models of mechanical multidimensional discrete-continuous systems “carriage – track” in terms of static and impact interaction in a butt roughness zone are proposed. Their interaction is investigated with the example of a four-axle car and a track for four motion phases in the place of isolated butt roughness. Parameters of static and impact interaction of the carriage with a track in a place of butt joint which takes into account operational and constructive factors are defined.

14

Authors: Peter ŠULKA, Alžbeta SAPIETOVÁ, František BÁRNIK

This article deals with vibration analysis and the processing of the vibration signal obtained during the experimental measurement on a rotary shaft at start-up, constant speed and run-out, with rolling ball bearings. The next step of the research is the introduction and application of mathematical and numerical methods for the processing of input and measured data using diagnostic and mathematical software. The principle of measurement and processing was to compare the results of oscillation of an undamaged bearing with several types of damaged bearings with corresponding deformations in the orbits/raceways. The purpose of this research and comparison was to achieve optimal results (in terms of amplitude values, the occurrence of eigenvalue vibrations and the resonance phenomenon) of individual bearings with corresponding deformations in the raceways and to obtain calibration diagrams as a tool for possible prediction of bearings in operation.

24

Authors: Izabela BUCZAK, Paulina GIZA, Aneta JANAS, Andrzej KOSIBA, Katarzyna SOBINEK, Monika RYSAK, Justyna PANICZ, Patrycja PŁANETA, Krzysztof LIPIEŃ, Witold KOGUT, Houshmand E. MASOUMI

The circumstances of passengers’ decisions and behaviours concerning non-commute urban travels in Eastern Europe is not well-studied; most of the studies on this topic was done on Western societies. This paper presents the results of a study on Cracow, Poland. This study is based on a survey in two neighbourhoods of different urban forms in Cracow, one with central structure with compact land use and the other a representative of socialist urban form with big residential blocks and no central local places. The survey was carried out from January to February 2019 with 426 inhabitants. The results of the Ordinary Least Square models reveal that age, daily activity, the place of shopping, frequency of shopping in the vicinity of homes, and frequency shopping activities outside in farther places are significantly correlated with the frequency of non-work trips in Cracow. The sprawled decentral district produces a high correlation between shopping trips outside the district and the overall nonwork trip frequency, referring to the failure of the socialist urban form to keep non-work trips inside the districts by the presence of local facilities like shops and retail. It is discussed in this paper that such correlations may be very much context-specific, as there are some differences between the findings of this paper and those of international findings in high-income and developing countries.