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The paper presents a part of research on bolted connections based on the system approach to the problem of their modelling and calculations. With this approach it is possible to individual consideration of each system element in order to find the best model of the element. The aim of this study is to develop a model of the single-bolted joint separated from the bolted connection. An analysis is conducted...
The use of alternative energy sources for internal combustion (IC) engines is being raised. The most promising fuel in such application is natural gas in gaseous state, which mainly consists methane. It is mainly being used as an engine fuel for both monofuel and dual fuel configuration. Many investigations confirmed the benefits of application of dual fuel compression ignition engine fuelled with...
In recent years, the introduction of modern solutions to energy sector beyond energy efficiency places special emphasis on environmental issues. They concern efforts to achieve the lowest possible carbon dioxide emissions and toxic substances into the atmosphere. One of the main methods to reach this goal is using biomass as fuel. Because of its life cycle, biomass is considered as neutral to the...
Significant content of SO3in exhaust gases generates difficulties in maintenance of metallurgical plants and large combustion installations. To minimize the range of this problem, numerical models of reacting flow can be introduced to the designed process. Modeling combustion and post combustion of SO3formation requires adding reaction mechanism of reactive mixture to flow equations. In this work...
The basis of a combined cycle gas turbine mass and energy balance, carried at the concept stage, preliminary design or during analysis, is the calculation of the gas turbine design point. This article presents a gas turbine unit mathematical modelling process intended for implementation of the model in a computer program. The aim of the development was a relatively simple, practical from engineer’s...
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...
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