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The paper discusses the possibility of a synthetic approach to the problem of exhaust emissions measurements from piston aviation engines used in small general aviation aircrafts. The realization of this approach is a result of an analysis of the needs of identification and evaluation of the aircraft ecological performance under actual operating conditions. The issues discussed in the paper pertain...
The paper is a synthetic approach to exhaust emissions from non-road vehicles measured under actual operating conditions and methods of their measurement. The paper outlines the legislation related to the exhaust emissions from non-road vehicles. Example test results under actual operating conditions have been presented and on this basis, conclusions have been formulated as regards the applicable...
This article presents the dynamic behavior of a rail car on the example of the modernized Polish railway electrical multiple unit EN57. Full models of this car are considered. The effects of impacts between elements of suspensions are included in our calculations. The running properties of rail vehicles are sensitive to the contact geometry between the wheel and rail. All analyses presented here are...
This paper presents an iterative algorithm for determining the porosity distribution of a material filling cooling channels in the gas turbine blades. The objective of numerical simulations employing this algorithm was to obtain the assumed temperature distribution on the inner boundary of the blade (walls of the cooling channels). Calculations were performed for the region of an elliptic ring, for...
This paper discusses some selected problems associated with the development and design of technical means for disabled persons and senior citizens. Domestic market for these products was characterised. Moreover, areas of possible development of domestic products as well as causes of poor development of products were examined and problems linked with communication within a designing team and member...
This paper contents a discussion about combustion chambers of compression ignition engines and their influence on pollutants emission. In a first chapter combustion system and CFD possibilities in researches were characterized. Second chapter is short review about types of combustion chambers from past and recently use. Third chapter presents influence of combustion chamber geometry on engine efficiency...
This paper describes a proposal of evaluation of timetables using driving simulator. The main goal of evaluation is to state, if the riding times allow to drive in a safe and economical way. Construction of the timetables was based on preliminary simulations and Polish national rail infrastructure manager's regulations.
The article discusses the impact of engine stopping and starting on conditions of operation of drive system in urban traffic. The motivation for the realization of the undertaken subject was assessment of the benefits of using a start–stop system in the aspect of increasing share of vehicles equipped with such a system. The article discusses the global sale of vehicles equipped with the start–stop...
Proper investigation of railway accidents is necessary for ensuring high level of safety in railway transport. In order to facilitate information flow on investigation results between Member States of the European Union, a database ERAIL (European Railway Accident Information Links) has been established. This database has been presented in this paper. At the beginning, the most important definitions...
This paper presents a simplified method for determining the limit forces acting at the outermost points of a trailer frame. The determinations were done for a tandem axle trailer with gross vehicle weight of 14,000 kg. The calculated forces will be subsequently used for determining the stress distribution pattern in the trailer frame.
The paper presents the problems of fuel consumption in internal combustion engines are analyzed on the economic and ecological levels which require developing modern fuel consumption monitors. The main property that such monitors must exhibit is the resistance to arduous operating conditions of combustion engines and no interference with the engine fuel supply and engine control systems. Additionally,...
The article presents the influence of harmful exhaust gases from motor vehicles on the environment. The continuous increase in the number of vehicles in operation makes this problem become more and more noticeable. The legal aspects and technical solutions designed to limit the negative effects of exhaust gas emission are presented.
W artykule przedstawiono założenia badań eksperymentalnych będących podstawą systemu monitorowania przeznaczonego dla zarządcy polskiej infrastruktury kolejowej. Badania są oparte na pomiarach i analizie dynamicznej odpowiedzi wybranego pojazdu kolejowego. Opisano wymagania funkcjonalne oraz metodykę badań rzeczywistych na wybranym odcinku magistrali kolejowej. Przedstawiono architekturę podsystemu...
This article presents a novel concept for coupled boundary layer control in transonic axial compressors. Proposed control scheme utilizes two steady active methods and couples them creating compact and in principle passive boundary layer control method. Both presented methods (steady suction and steady tangential blowing) are known since many years. In this article they are presented in the context...
Particulate emission from aircraft engines represents a significant threat to human health and air traffic. Particles emitted at areas of the airports are nano-sized, which easily leak into the lungs thus giving rise to heart diseases, asthma or bronchitis. Current standards of emission caused reduction of emission of large diameter particles generated by aircraft engines. Despite this increasingly...
This article is dedicated to logistics problems in the Armed Forces of the Republic of Poland. Considering Polish membership in NATO and the requirements resulting from that fact, the authors of this article focused on one of the most important issues of contemporary military logistics system, i.e. warehouse facilities. Since there are three categories of possible scenario for current military actions...
The article presents the acoustic models of noise distribution which is caused by the working devices being a part of the laboratory equipment in the Department of Rail Vehicles at the Faculty of Machines and Transportation in Poznan University of Technology. The research was based on the measurements of the sound pressure levels corrected with the frequency characteristics A. The measurements were...
Due to the development of railway market in Poland, the amount of new traction units put into service is growing every year. The vehicles are mainly manufactured by domestic companies and dedicated to passenger transport. The paper presents the methodology and results for measuring ride comfort, in extent of vibration and noise, at the driver’s stand in new and modernized rail vehicles, according...
The article describes the application of databases in the analysis of controlled gas nitriding processes. It shows the importance of database in data analysis, defines the concept of database, as well as its tasks; examples of database applications are listed, and the concept of data mining is characterized in the context of using databases for scientific purposes. The article discusses the need to...
Combustion engines are currently the leading source of mechanical energy in the sector of goods and people transport. Indispensable element of engines development is operational indicators rise. These indicators are direct criteria of comparison and they allow assessment of specific power level of each construction. It can be observed, that in the era of charge exchange systems the naturally aspirated...
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