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  • Author: Rafał Jurecki x
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Abstract

The article presents an analysis of traffic safety on major communication routes in Poland. The total number of accidents in Poland has been compared and analysed in relation to the objectives in the context of the GAMBIT programs and the National Road Safety Program for the years 2013-2020. Analyses of the number of accidents in the years 2004-2017 have been presented in the article. A significant decrease in accidents has been demonstrated and annual changes determined, the value of which ranged from 12.15 to 6.74%. The statistics on fatalities have been also analysed. A midyear change in the number of fatalities has been determined, which constitute -4.4% in the analysed period. The data on the number of vehicles registered in Poland, which considerably affects traffic congestion, has been presented. In spite of this, there has been no increase in the number of accidents. The work compares changes in the length of the most important types of routes in Poland, as well as accidents and fatalities that occurred on them. With the decreasing overall number of accidents in Poland, there has been a noticeable drop in accidents per 100 km of road length also on these roads. The fatality rate per 100 accidents in Poland has been determined and the average value of this rate in 2017 was 8.64, while on the analysed roads it ranged from 12.3 to 14.6.

Abstract

The paper presents a design basis adopted for the construction of a test facility for the rig testing of rolling bearings. One of the methods of inspection of the bearings is the testing of the bearings as components having already been mounted in a specific machine component unit and tested in the conditions of operation of the unit as a whole. This article presents preliminary engineering requirements and the design of a special test rig for the examination of rolling bearings without the necessity of mounting the bearings in a specific machine component unit. The rig testing is widely used in consideration of numerous good points of such a method. The simulation testing of bearings (on test rigs) consists in reproducing as accurately as possible the real conditions of operation of the bearings when mounted in the device for which they are intended. The rigs used for such tests are complicated and expensive, but the results of such tests are more “reliable” and more accurately represent the impact of various operational factors (loads) on the durability of the bearings under test.