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    Wyświetlanie 1-12 z 12
    Tytuł:
    The influence of the injection timing on the performance of two-stroke opposed-piston diesel engine
    Autorzy:
    Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/117835.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    diesel engine
    opposed piston engines
    two-stroke engine
    injection timing
    silnik wysokoprężny
    przeciwstawne silniki tłokowe
    silnik dwusuwowy
    czas wtrysku
    Opis:
    The performance of the engine strongly depends on the parameters of the combustion process. In compression ignition engines, the fuel injection timing has a significant influence on this process. The moment of its occurrence and its duration should be chosen so that the maximum pressure value occurs several degrees after TDC. In order to analyze the effect of the fuel injection timing on the performance of the tested two-stroke opposed-piston diesel engine, a zero-dimensional model was developed in the AVL BOOST program. Next, a series of simulations were performed based on the defined calculation points for maximum continuous power, which resulted in power, specific fuel consumption and mean in-cylinder pressure. Finally, the engine map was made as a function of the start of combustion angle.
    Źródło:
    Applied Computer Science; 2018, 14, 2; 69-81
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wojna w Donbasie - przyczynek do rozważań nad niedopowiedzeniami teorii wojny sprawiedliwej
    War in Donbas - considerations on the understatements of the just war theory
    Война на Донбассе - размышления о недосказанном на тему теории справедливой войны
    Autorzy:
    Neumann-Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1930269.pdf
    Data publikacji:
    2021-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    War in Donbas
    just war
    just war theory
    secession
    military interventions
    война на Донбассе
    справедливая война
    теория справедливой
    войны
    выход из состава государства
    военное вмешательство
    Opis:
    The following article covers the analysis of the War in Donbas from the perspective of the “traditional concept of a just war” (as interpreted by Michael Walzer). The main axis of the analysis is determined by the issue of the possibility of third countries intervening in armed conflicts concerning the specific case of the War in Donbas. The text indicates the key factors that make it impossible to develop a conflict in eastern Ukraine according to traditional just war theories, such as the pursuit of incomplete secession of pro-Russian separatists, the status of the Russian Federation as an unofficial participant in the conflict, and the problem of the “reality” of the separatist intention itself. Therefore, the main problem of this work is the interpretation of Russian actions from the perspective of the principle of non-intervention, and the attitude of other third countries and their right to (not) intervene in this conflict, and its conclusion - in the author’s opinion - indicates the need to update the theory of just war, in a way that would clearly indicate the proper conduct in the event of secession in favour of the existing state.
    В данной статье проводится анализ войны в Донбассе с точки зрения «традиционной концепции справедливой войны» (по М. Вальцеру). Главной осью исследования является вопрос возможного вмешательства третьих сторон в вооруженные конфликты, в данном случае относительно войны в Донбассе. В тексте указаны ключевые факторы, которые не позволяют рассматривать конфликт на востоке Украины с помощью традиционных теорий «справедливой войны», в частности: стремление пророссийских сепаратистов к неполной сецессии, статус Российской Федерации как неофициального участника данного конфликта или проблема «реальности» самого сепаратистского намерения. В связи с вышесказанным главной проблемой статьи является интерпретация действий России с перспективы принципа «невмешательства», а также отношение других государств и их право на (не)интервенцию в этот конфликт, разрешение которого - по мнению автора - указывает на необходимость актуализации теории «справедливой войны», чтобы она ясно показывала, какими должны быть правильные действия в случае сецессии в пользу существующего государства.
    Źródło:
    Nowa Polityka Wschodnia; 2021, 2(29); 111-123
    2084-3291
    Pojawia się w:
    Nowa Polityka Wschodnia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation study of hydrodynamic cavitation in the orifice flow
    Autorzy:
    Pietrykowski, Konrad
    Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/38436947.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    cavitation
    CFD
    fluid flow
    hydrodynamics
    orifice
    simulation
    Opis:
    Hydrodynamic cavitation is a phenomenon that can be used in the water treatment process. For this purpose, venturis or orifices varying in geometry are used. Studying this phenomenon under experimental conditions is challenging due to its high dynamics and difficulties in measuring and observing the phase transition of the liquid. For this reason, the CFD method was used to study the phenomenon of hydrodynamic cavitation occurring in water flow through the orifice and then analyze flow parameters for different boundary conditions. The research was performed for four different orifice geometries and two defined fluid pressure values at the inlet, based on a computational 2D model of the research object created in Ansys Fluent software. As a result of the numerical simulation, the distribution of fluid velocity and pressure and volume fraction of the gas phase were obtained. A qualitative and quantitative analysis of the phenomenon of hydrodynamic cavitation under the considered flow conditions was conducted for the defined orifice geometries. The largest cavitation zone and thus the largest volume fraction of the gas phase was obtained for the orifice diameter of 2 mm with a sharp increase in diameter. However, the geometry with a linear change in diameter provided the largest volume fraction of the gas phase per power unit.
    Źródło:
    Applied Computer Science; 2022, 18, 3; 31-41
    1895-3735
    2353-6977
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of the Influence of Particular Parts of the High Efficient Electric Vehicle on the Aerodynamic Forces
    Autorzy:
    Czyż, Zbigniew
    Karpiński, Paweł
    Koçak, Salih
    Powiązania:
    https://bibliotekanauki.pl/articles/102678.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aerodynamics
    computational fluid dynamics
    drag force
    electric vehicle
    fluid mechanics
    aerodynamika
    obliczeniowa dynamika płynów
    siła oporu
    pojazd elektryczny
    mechanika płynów
    Opis:
    The work presents a three-dimensional modeling of air flow around the research object. The purpose of this work was to perform numerical calculations to identify the magnitude of the aerodynamic drag force generated on individual elements of a high energy efficiency vehicle body. This vehicle, specially designed for the Shell Eco-marathon competition, needs to show the lowest possible fuel consumption while maintaining the prescribed speed. Minimizing the drag force at an early designing stage plays an important role here. The calculations were performed using the ANSYS Fluent calculation solver. The result of the conducted research is a description of the velocity and pressure distributions around the tested vehicle as well as an identification of the drag force on the external surfaces of the components and a description of the relationship between them. The work also discusses the dependence of the drag force as a function of speed in the range from 0 to 12 m/s. The influence of the ground on the drag force in the case when the object was immobilized in relation to the walls at the flowing medium, as in a wind tunnel, was investigated. On the basis of the calculations performed, no impact of the ground on the generated drag force magnitude was found.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 4; 1-7
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research of two stroke aircraft diesel engine
    Autorzy:
    Grabowski, Łukasz
    Karpiński, Paweł
    Barański, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/133420.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engine
    indicated pressure
    opposed-piston
    two-stroke
    silnik wysokoprężny
    ciśnienie indykowane
    tłok przeciwbieżny
    silnik dwusuwowy
    Opis:
    This paper presents the results of experimental studies of the opposed-piston diesel engine. This engine was designed during one of the stages of the research on a new-type drive unit for gyrocopter applications. In order to conduct research, a special test stand as well as control and measurement systems were developed. As part of the work on the engine, the fuel injection system, engine temperature control system and measurement systems were designed. In addition, a computer program has been developed for the fuel injection system control (injectors, valves fuel pressure regulators). The paper presents the results of the preliminary tests for a single value of engine speed (1500 rpm) and three values of load defined by torque. The measured value of the indicated pressure made it possible to calculate the maximum pressure. The results obtained from the bench tests were analyzed.
    Źródło:
    Combustion Engines; 2019, 58, 4; 75-79
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation Research of the Influence of Compression Ratio on the Performance of an Aircraft Piston Diesel Engine
    Autorzy:
    Grabowski, Łukasz
    Karpiński, Paweł
    Magryta, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/102502.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aircraf
    compression ratio
    diesel engine
    opposed-piston
    two-stroke
    samolot
    stopień sprężania
    silnik wysokoprężny
    tłok przeciwbieżny
    dwusuwowy
    Opis:
    In recent years, the opposed-piston engines have become increasingly popular in the automotive and aerospace industries. Therefore, it is necessary to conduct the research on this type of drive. The paper presents the simulation research of a two-stroke opposed-piston diesel engine designed for propulsion of light aircrafts. The influence of the change of the compression ratio on the selected engine performance was investigated (indicated mean effective pressure, peak firing temperature and pressure, specific fuel consumption, power consumed by the compressor). The AVL BOOST software was used to perform the simulation tests. A zero-dimensional engine model equipped with a mechanical compressor was developed. On the basis of the created model, a series of calculations was performed for the assumed values of the compression ratio for four engine operating points: take-off power, maximum continuous power and cruising power at two different altitudes. The obtained results were subjected to a comparative analysis and the most important conclusions connected with the influence of the change in the compression ratio on the achieved performance were presented.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 3; 175-181
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Aerodynamic Drag Force Exerted on a Powerboat
    Autorzy:
    Czyż, Zbigniew
    Karpiński, Paweł
    Boujelbene, Chahin
    Powiązania:
    https://bibliotekanauki.pl/articles/102080.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aerodynamics
    boat
    CFD
    drag force
    powerboat
    aerodynamika
    łódź
    siła tarcia
    motorówka wyścigowa
    Opis:
    The aerodynamics of powerboats used in inshore powerboat racing has a significant impact on their performance. The aerodynamic drag forces generated on individual elements of this type of boats were tested. The solid model of the boat developed in the CAD software was used for the calculations. The computational grid was generated, as well as the boundary conditions and the turbulence model, were determined. On the basis of such assumptions, the numerical calculations were carried out using the CFD method. The results from the numerical simulations consist of a description of the velocity and pressure distribution around the tested object and identification of the drag force on the components of the powerboat with a description of the relationship between them. Additionally, the variation of the drag force as a function of speed in the range from 0 to 60 m/s was presented. The tests were performed for 5 values of the angle of attack of the boat to the surface of water in the range from 0° to 12°. The scope of the research allowed for the development of a drag force map depending on the defined parameters. The test results can be used to optimize the shape of the boat structure in order to reduce the aerodynamic drag generated on its individual elements.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 3; 141-148
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turbocharging the aircraft two-stroke diesel engine
    Autorzy:
    Karpiński, Paweł
    Pietrykowski, Konrad
    Grabowski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/133547.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    aircraft engine
    two-stroke engine
    diesel engine
    turbocharger
    supercharger
    silnik lotniczy
    silnik dwusuwowy
    silnik wysokoprężny
    turbosprężarka
    supersprężarka
    Opis:
    The power and efficiency of a two-stroke engine strongly depends on the efficiency of the scavenging process which consists in removing the rest of the exhaust gases from the cylinder and filling it with a fresh charge. The quality of the charge exchange process is significantly influenced by the construction of the intake system. The paper presents a zero-dimensional model of the aircraft two-stroke opposed-piston diesel engine with two variants of the intake system: with a mechanical compressor and a turbocharger connected in series with a mechanical compressor. Simulation studies of the developed cases were carried out in the AVL BOOST software. For the defined engine operating points, its performance was compared for different designs of the intake system. It was confirmed that the use of a turbocharger with a mechanical compressor extends the range of operating at high altitudes.
    Źródło:
    Combustion Engines; 2019, 58, 3; 112-116
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the applicability of a common rail pump for an aircraft engine
    Autorzy:
    Sochaczewski, Rafał
    Szlachetka, Marcin
    Wendeker, Mirosław
    Karpiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/133099.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    diesel engine
    two-stroke
    opposing piston
    fuel pump
    common rail
    silnik wysokoprężny
    dwusuw
    tłok przeciwbieżny
    pompa paliwa
    Opis:
    The paper presents an analysis of the possibility of using a common rail pump to supply an aircraft compression-ignition engine. It is an engine with a two-stroke cycle, three cylinders, opposing pistons and 100 kW power. Its each combustion chamber is supply by one or two injectors controlled by electromagnetic valves. In order to assess the possibility of using a common rail pump, four high-pressure pumps were tested on a bench. They are piston pumps differing in the number and geometry of their pumping sections. The analysis included the pumping output, the torque on the pump drive shaft and the power needed to drive the pump. The weight and overall dimensions of the pump were also considered, including the arrangement of the pumping sections and the way the drive is transmitted. The research allowed to optimize the engine power supply system depending on fuel demand and the way the pump is mounted on the engine.
    Źródło:
    Combustion Engines; 2019, 58, 4; 192-197
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The air flow influence on the drag force of a sports car
    Autorzy:
    Czyż, Zbigniew
    Karpiński, Paweł
    Gęca, Michał
    Diaz, Jacobo Ulibarrena
    Powiązania:
    https://bibliotekanauki.pl/articles/103127.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    numerical analysis
    CFD
    drag force
    car body
    sports car
    analiza numeryczna
    siła tarcia
    karoseria
    samochód sportowy
    Opis:
    The paper presents the numerical analysis of the drag force generated on the body of a sports car, based on the CFD method in the Ansys Fluent program. The three-dimensional model of the vehicle was taken from an open CAD database. Based on this, a computational grid was developed, boundary conditions and a turbulence model were defined. As a result of the calculations, the pressure distribution on the individual body parts and the velocity distribution in selected cross sections were obtained. In the next part of the research, the simulation results are used to optimize the shape of the bodywork of different passenger vehicles in order to reduce the generated drag force.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 121-127
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deformation measurement system for UAV components to improve their safe operation
    Autorzy:
    Czyż, Zbigniew
    Jakubczak, Patryk
    Podolak, Piotr
    Skiba, Krzysztof
    Karpiński, Paweł
    Droździel-Jurkiewicz, Magda
    Wendeker, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/28328271.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    strength tests
    deformation measurement
    optical displacement
    deformation analysis
    digital image correlation
    UAV
    Opis:
    The paper presents the authors’ method and test rig for performing the deformation analysis of unmanned aircraft fuselages. To conduct the analysis, the DIC system was used, as well as a test rig designed and constructed by the authors, equipped with a dedicated control and load control system. The article presents a description of the research capabilities of the test rig developed for testing the deformation of unmanned aircraft fuselages. Due to the specific operating conditions of the designed fuselage,the test rig developed allows the simulation of loads corresponding to different flight conditions. In addition, it is possible to change the forces acting on the fuselage simultaneously for all servos or each of them separately. Finally, results showing the displacement of component control points for the considered fuselage versions are presented. The tests carried out using the developed test rig allowed the verification of the maximum deformations. The two versions of the composite fuselage of an aerial vehicle have been compared in the paper. The created measurement system and performed analyzes have enabled us to identify and quantitatively analyze the weaknesses of the construction. The results have enabled us to geometrically modify the constructionso the mass of the fuselage reduced by 19% and a coefficient of construction balance increased by 22%.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172358
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pieśń o Narodzeniu Pańskim (Bóg się rodzi...)
    Autorzy:
    Karpiński, Franciszek
    Współwytwórcy:
    Niedziałkowska, Marta
    Kozioł, Paweł
    Data publikacji:
    2010-11-25
    Wydawca:
    Fundacja Nowoczesna Polska
    Tematy:
    Pieśń
    Oświecenie
    Liryka
    Opis:
    Publikacja zrealizowana w ramach projektu Wolne Lektury (http://wolnelektury.pl). Reprodukcja cyfrowa wykonana przez Bibliotekę Śląską z egzemplarza pochodzącego ze zbiorów BŚ.
    Źródło:
    Śpiewnik ludu katolickiego, książka do nabożeństwa, Bytom 1900
    Dostawca treści:
    Wolne Lektury
    Książka
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