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.