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This paper is concerned about verification of a tram wheel new profile on multi-body simulation basis. The profile was obtained in an optimization process, which objective function was reduction of gaps occurring between points of contact with rail. The following parameters were checked: derailment coefficient Y/Q, wheelset lateral displacement, number of contact points and wear index. The aim of...
The paper presents the mechanism of the wing in ground effect formation, also shows the structure of wing in ground craft, and race car, which uses wing in ground effect. Results of numerical analysis are as expected, which means, the lift coefficient is higher for positive angles of attack, and lower for negative angles of attack. The paper details also characteristics of lift and drag coefficients...
The article presents the safety issue bonded to the Polish Air Force aircrafts, which uses for emergency supply special fuel called hydrazine, which is 70% aqueous solution of toxic hydrazine with designation H-70. For this reason, the rescue services of Polish Air Force bases where this types of aircraft are stationed had to be adjusted accordingly. Just as importantly authors noticed that in the...
The article analyzes the exhaust gases from the vehicle pickup during drive tests. The research was carried out on a vehicle of this type because of the growing vehicle sales of this type of chassis in both domestic and European level. The study was conducted in Poznan, two drives of the same track were performed - economic and dynamic. To test the exhaust emission was used PEMS apparatus (Portable...
The article aims to highlight the desirable and undesirable properties and characteristics of different energy storage technologies. It focuses on the comparison between the different specific battery technologies and supercapacitors currently available on the market, as well as novel technologies that are still in development. Assessment is made for these technologies based on their strong and weak...
The share of rail transport in transportation of goods in Poland has been declining for many years. The chance to reverse this negative trend lies in an intermodal freight transport, which takes advantage of multiple modes of transportation. It is widely used in Western Europe. However, in Poland, there are not enough railroad terminals which would enable handling of containers. There are four times...
The paper presents the results of investigations related to the possibilities of control of the radio aerial mast carried out on a test stand reproducing the inverted pendulum phenomenon using servo drives and LabVIEW environment. The authors present individual components of the stand and the measurement equipment used in the experimental investigations.
The article presents the results of the technical and economic use of cogeneration technologies designed to increase the efficiency of use of natural gas to produce electricity and heat for the needs of large objects. The arrangement shown is part of the distributed generation of electricity and heat. As a supplement can be used such systems as ORC systems, heat pumps, solar collectors and photovoltaic...
In this article authors researched maintenance system of the multirole F-16 aircraft. For the study purposes, the F-16 maintenance system model has been created. From this model, the main analysis domain was derived, comprising „Minor aircraft objects discrepancies removal” process. Considering such an analysis domain, on the basis of the schematic diagram of the hazard identification process, authors...
The paper presents a test stand for testing segments of single sided and double-sided labyrinth seals. The geometry of the test stand has been designed and constructed by the authors of the paper. The elements and the design of the test stand allow investigations of the seal for a variety of initial pressures with the measurement of the mass flow in the inlet and outlet channels. The design of the...
The main purpose of this paper is to design the Model of Generalized Technical System (MGTS) which derives from spread analysis of presently existing models of technical systems. Undertaken considerations are aimed to indicate a suitable general model based on observed homology between currently existing technical systems in e.g. different transport branches. It is predicted that the following model...
Nowadays traffic noise in large urban areas became serious problem, especially for inhabitants and their life comfort. It is well founded to accurately identify the sound sources and their impact to environment. Therefore plenty of acoustic models allow to calculate the distribution and prediction of sound pressure levels. Unfortunately many of them do not have the required calculation accuracy in...
This paper presents the method of selection of temperature measuring points in a cylinder. Measuring points were selected with regard to technological capabilities of spot drilling and the accuracy of measuring system of the heat-treating furnace VTR PP. Analysis showed where thermocouples should be located so that the heat flow in the heated cylinder was minimally disturbed. Calculation model developed...
In the present times energy saving is one of the most challenging tasks, faced by the modern society. The automotive industry experiences it to a very high extent, not only because of the obvious facts about consuming fossil fuels (which are limited), but also because it attracts common attention of the society itself. The automotive industry is being forced by the authorities to limit the fuel consumption...
In designing railway combustion engines, the key objective is to reduce fuel consumption. The way to achieve this objective is reduction of friction losses in the piston – cylinder node, which is the main in combustion engine. The analysis subjected railway engine DZC6 produce by Anglo Belgian Corporation, where on the basis of the parameters was carried out simulations for pistons with revised microgeometry...
The paper presents a draft model of a test stand for the measurement of the efficiency of automatic positioning systems of radar antenna reflectors. The described test stand was designed and constructed for the identification of the aircraft position during air show aero-batics. The authors of the paper have presented and discussed in detail the test stand’s individual components and measurement equipment.
The longitudinal rail vehicle dynamics dealing with the movement disturbance along the railway track are part of the overall vehicle dymamics. Most of the longitudinal dynamics considerations relate to more than one vehicle up to the whole train. The aim of the article are chosen problems of the longitudinal rail vehicles dynamic issues and then more exactly of the train braking. Inextricably linked...
The article presents the particulate matter measurement analysis of a passenger vehicle equipped with diesel particulate filter in real operating conditions. The tests were conducted in the Poznań urban agglomeration on routes with variable speed limits. The procedure included two different driving styles – aggressive and normal. The measurement of particulate matter included their mass, surface area,...
The article discusses the current technologies and methods of fast, safe, and efficient charging of modern high-capacity batteries. The aim of the research is to determine which of the currently used technological solutions are most suitable for use in charging of supercapacitor energy storage devices. Modern solutions applicable to battery technologies which due to the operating characteristics and...
The article discusses the subject of light duty vehicles exhaust emissions in real driving conditions and their connection with fuel consumption. Tests were carried out in the Poznan agglomeration area on roads with various speed limits. The driver was to drive the same distance first driving in an aggressive manner than normally. Emissions of the following compounds were measured using a SEMTECH...
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