Scientific Journal of Silesian University of Technology. Series Transport

7

Authors: Kirill VOINOV

The speech in this article is going about the standard bush-roller chain for bicycle, machine-tool or for conveyor. And the chain can be settled in the different spatial position, namely in vertical, horizontal or in the slope. In all these cases we have to stretch the chain periodically because of wear during the operation. For this aim the people apply different contact methods: spring-loaded rollers, flat springs (as a pair of friction), stretchers and so on [2, 3]. But here we describe a new way how to stretch the chain constantly and without any additional pairs of friction at all [1, 2, 3] using only magnet. It simplified design and enhanced the resistance against wear essentially.

9

Authors: Tomasz HANISZEWSKI

Bouc-Wen model is theoretical formulation that allows to reflect real hysteresis loop of modeled object. Such object is for example a wire rope, which is present on equipment of crane lifting mechanism. Where adopted modified version of the model has nine parameters. Determination of such a number of parameters is complex and problematic issue. In this article are shown the methodology to identify and sample results of numerical simulations. The results were compared with data obtained on the basis of laboratory tests of ropes [3] and on their basis it was found that there is compliance between results and there is possibility to apply in dynamic systems containing in their structures wire ropes [4].

9

Authors: Marek RUTKOWSKI

The article analyzes problem of construction of the fortress bridges in Kingdom of Poland, when it was occupied by Russians in the period after the fall of November Uprising in 1831. By presenting of some diverse solutions adopted in two different Russian strongholds localized within the Polish territory, it was possible to show at the same time a broad spectrum of this phenomenon, focusing both on construction efforts made by Russian military occupation authorities as well as by the local Polish civilian administration. The obtained data should allow us to argue for construction in the mentioned period of fortress bridges with use of both already proven and established methods and of new solutions. In the same time one might add thesis concernig (especially visible among highest ranks staff of Russian army) significant uncertainty about the very nature and scope of possible availability of fortress bridges.

10

Authors: Robert KONIECZKA

This article provides a summary of the issues involved in de-icing several kinds of aircrafts before flight. The basic risks of an iced aircraft and the factors that can influence its intensity are stated. It discusses the methods for de-icing and protecting against ice formation on small aircrafts, helicopters, and large aircrafts. It also classifies the fluids and other methods used for these de-icing operations, and explains the characteristics and limitations of their use.

12

Authors: Damian GĄSKA, Martin TRPIŠOVSKÝ, Maria CIEŚLA

This paper presents a selective comparison of the organization of public transport in the metropolitan regions of Prague and Warsaw. A brief description of the regions and the specification of the most important characteristics of public transport systems has been shown.

14

Authors: Darja TOPOLŠEK, Andrijana MOĆIĆ, Matjaž KNEZ, Marjan STERNAD

We have to consider the fact that alcohol is a legal drug. The spread of alcohol consumption reflects also in the road traffic safety; nevertheless, alcohol is a significant factor in traffic accidence occurrence, especially in those with serious consequences. In the last few years traffic crashes with fatalities are just following one another and are mostly caused by drivers who consumed alcohol. Adolescents between ages 15 and 24 are one of the most endangered groups of people in traffic, especially drivers and passenger between ages 15 and 24. Adolescents tend to acquire drivers licence as soon as possible in order to enter into drivers’ world. Young drivers as participants in traffic represent a bigger danger as they consume alcohol and drive, than older experienced drivers with the same level of alcohol in blood. We have precisely examined the topic on traffic accidents, young drivers and alcohol intoxication in our country and abroad. We have also carried out a field investigation – conducted a survey in the district Nova Vas - Celje. We came to conclusions which we found very much disturbing as they based on the analysis of results and processed information.