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  • Author: Adam Torok x
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Automatization in road transport: a review

Abstract

In this article automatization of road transport is investigated. In the first chapter relevant international trends were identified. In this paper the research hypothesis is that in the case of automatized road vehicles there is a significant likelihood of endangering human life. Secondly, the history of road safety is shortly described, especially focusing on vehicle design and sweep of system’s theory. In the third chapter evolution of drivers’ assistance systems were elaborated, emphasizing especially autonomous vehicles. Finally, in conclusion the authors warn that new technological solutions could pose new threats.

Open access
Effects of Renewable Energy Sources on Air-Fuel Ratio

Abstract

Environmental emission of road transport is a key problem. Periodic environmental test are designed to ensure minimum emission. Periodic checks are based on measurements. In this emission measurements fuel type plays an important role. The Brettschneider equation is a method used to compare the idealized and actual air fuel ratio. Brettschneider established a method to calculate ratio of oxygen to fuel by comparing the ratio of oxygen molecules to carbon and hydrogen molecules in the exhaust. In this article, authors have investigated blended ethanol effect on idealized and actual air fuel ratio based on Brettschneider equation. The main result of the article that blended ethanol has insignificant effect on air-fuel ratio. The article presents inter alia difference in stoichiometric air fuel ratios in case of different fuels, changes in λ due to blending ethanol and comparison of influence of emissions of different types of transport. In the article authors focus particularly on periodic checks and gasoline driven cars. The main research question was if ethanol blends have effect on idealized and actual air fuel ratio based on Brettschneider equation.

Open access
Experimental Dynamical Analysis of The Material Properties of Test Pieces Made by Additive Production Technologies

Abstract

The recent years, 3D printing has become a hot topic, however, it’s hard to design parts without a deep understanding of the material properties. The aim of this study is to estimate the modal parameters and the damping properties via experimental dynamic analysis of a part made from PLA. We will study the effects of the different directions of printing. With the results we can provide data for FEM software input.

Open access
Usage of Production Functions in the Comparative Analysis of Transport Related Fuel Consumption

Abstract

This contribution aims to examine the relationship between the transport sector and the macroeconomy, particularly in fossil energy use, capital and labour relations. The authors have investigated the transport related fossil fuel consumption 2003 -2010 in a macroeconomic context in Hungary and Germany. The Cobb-Douglas type of production function could be justified empirically, while originating from the general CES (Constant Elasticity of Substitution) production function. Furthermore, as a policy implication, the results suggest that a solution for the for the reduction of anthropogenic CO2 driven by the combustion of fossil fuels presupposes technological innovation to reach emission reduction targets. Other measures, such as increasing the fossil fuel price by levying taxes, would consequently lead to an undesirable GDP decline.

Open access
Bicycles’ Role in Road Accidents a Review of Literature

Abstract

Nearly 1.3 million people die in road crashes each year, on average 3,287 deaths a day. In 2013 in the European Union more than 6 % of all who died in road traffic crashes were cyclists. The number of cyclist killed on roads in the EU has decreased by only 9 %, compared to the total fatality decrease of 18 % from 2010 to 2013. The majority of cyclist fatalities are males (78 %). For the larger countries, Belgium and The Netherlands had the highest proportion of female cyclist fatalities (> 30 %). In general, 55 % of the bicycle fatalities in the EU countries were killed inside urban areas but there are large differences between the countries. In the last couple of years there has been an enormous effort on reduction in cycling fatality numbers across almost all ages in the EU. As a result of this effort, the number of accidents started to slightly decrease.

This paper reviews the literature concerning cyclist-motor vehicle collision and road safety management according to the cyclist role in the accident rise. The paper examines pedestrians safety in order to determine what kind of factors of transport infrastructure, vehicle technical parameters, cyclist behavior and road or street category have the influence on cyclist and vehicle accidents and identify technical reasons of the accidents rise. A review is conducted of information in the literature on the injury outcome of a cyclist/vehicle collision for a given impact speed and the likely consequences of reducing the travelling speeds of vehicles in terms of the frequency and severity of cyclist injuries.

Open access
Theoretical Investigation of Traffic Equilibrium on Bridges

Abstract

Road traffic flows on a straight road segment such as bridges are modelled in this article. The mathematical model of traffic flows has been constructed by using the method of lumped parameters. Changeable lane direction and road pricing has been theoretically investigated in order to understand the shifting in supply and/or demand curves of traffic participants in equilibrium. The article presents assumptions for constructing the mathematical model. Demand can be influenced by road pricing, in its turn, supply can be influenced by extension of infrastructure with reversible lanes.

Open access
Creating Safe and Competitive Conditions for the Provision of Rail Transport Services

Abstract

Safety is a key and necessary condition for the sustainable development of the railway industry. Every entity operating in the railway area should maintain and increase the level of security as part of its operations. The subject of the analysis of data on the rail transport safety in European countries and content of the safety culture program implemented in Poland, whose main objective is to implement safety culture principles in the railway transport and to encourage all companies operating in the railway industry to improve the rail transport safety as the key condition for the sustainable development of railway industry. Paper contains results of the analysis of the European rail transport safety level in the context of the objectives set for Poland indicated by the European Union (CSI value) as improvement areas.

Open access
Theoretical Investigation of Supply Chain Service Level in Hungary and Poland

The article presents research and analysis in the enterprises of logistics chains. The paper demonstrates the main findings of the investigation. Theoretical investigation has been done in order to measure the relations between enterprises, suppliers and customers. Whatever the nature of the logistics chain is, the problem for the company remains how to deal with suppliers. This paper focuses on the assessment of supply chains and forecasting influence possibilities. The guidelines describe supplier selection. The methodology presented allows the assessment of suppliers.

Open access
Passenger Car as Complex Experience

Passenger cars are complex products that consist of millions of parts. Cars have different shapes and colours giving persons different emotional feelings. Therefore the car as a complex product is suitable for marketing specialist for comparing other products through cars. Authors are describing the mathematical background of the theoretical investigation and the practical results of such examination.

Open access
Identifyingy the Utility Function of Transport Services From Stated Preferences

Abstract

The aim of this study was to analyze the modal shift of passengers by analyzing their preferences. If the preferences of passengers are known it is possible to build up mathematically their utility function. This is the statistically correct way to simulate the modal shift of the investigated area. To capture the preferences of passengers stated preference method was used in online questionnaire. Five key factors were identified (from the point of passengers): travel cost, travel time, comfort, safety and environmental efficiency. In order to decrease the number of questions three levels were predefined these three questions made the base of the choice model. Every replier got three alternatives and they were told to choose the best for themselves. From the results of the questionnaire the formulas and the parameters of the mode choice utility function was derived. With the help of statistical sample an exponential utility function showed the best matching. For the validation process a probability model was set up to be compared to the proportions of the utilities. With this utility function it is possible to handle the changes in possible future transport services. Based on the introduced statistical approach the described method can be used to identify the effect of transport modes on regional development and tourism. The revealed utility function can help to develop proper regional development plans.

Open access