Rafał Stanisław Jurecki

Driver model for the analysis of pre-accident situations

The study presents a brief description of driver models found in the literature. Despite the large number of models, in the case of pre-accident situations the existing driver models cannot be successfully used to reconstruct driver behaviour. A driver model adequate to this type of situation has been proposed. The scenario of a pre-accident situation has been described briefly. The article aims to present the results of identification of the driver model parameters on the basis of the results of track tests. An analysis of the obtained characteristics of the turning angle and deceleration has been made. The drivers studied have been divided into groups according to similar types of reactions. The identification has been conducted for the pre-defined four driver groups. Values and reaction time linear regression equations have been specified for braking and wheel turns on the track. The results of identification of the remaining model parameters on the basis of test results have been presented.

Driver's reaction time in a simulated, complex road incident

AbstractThis paper presents an overview of research on the behaviour of drivers in simulated accident situations. The research was carried out by the authors of this work as a part of a research N N509 549 040 funded by the National Science Centre including new accident situations. The paper presents a description of the methodology and implementation of research on a track. During the tests, the simulation concerns about an accident risk situation involving pedestrians and passenger cars intruding the road area. In contrast to earlier research carried out by the authors, the scenario included the possibility of a pedestrian ‘entering’ from behind a curtain, both from the left and from the right sides of the road. This was possible thanks to a specially developed test stand. The paper analyses the values of driver’s reaction times characteristic to driver’s impact on: acceleration control pedals, service brake and steering wheel. In addition to the determination of average reaction time values and the reg...

Design of a Test ring for the Examination of Mechanical Properties of Rolling Bearings

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.

Results of load's observation for selected marine electric power plants systems in floating objects

Some aspects of marine electric power plants load registration and identification have been presented. Methods of operating data collecting about marine electric power plant loads have been shown based on an example of three vessels - a chemical tanker, a container ship and a tanker. Power plants of these vessels have been described. Examples of collected operating data were presented. Range of marine electric power plant load identification research has been characterized, which presented in the paper results are a part of.