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Wyświetlanie 1-15 z 112
Tytuł:
Numerical Modelling and Measurements of Temperature for Tests of Structural Transformations in Steels under Welding Conditions
Autorzy:
Mikno, Z.
Stępień, M.
Grzesik, B.
Powiązania:
https://bibliotekanauki.pl/articles/352069.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FEM
thermocouple measurement
CCT diagrams
Opis:
This paper presents the way in which temperature is measured in tests concerning structural transformations in various types of steel under welding conditions. In the test methodology, a small-sized steel specimen was subjected to simulated welding thermal cycles, during which the temperature of the specimen, changes in magnetic permeability and thermal expansion were measured simultaneously. The measurements of those parameters required the non-contact heating of the specimen, which involved the use of heating lamps. The temperature measurement was of key importance because the subsequent analysis of the remaining parameters was performed in the function of temperature. The tests of structural transformations resulted in the development of Continuous Cooling Transformation under welding conditions (CCT) diagrams, enabling the determination of steel weldability and constituting the source of information needed to determine the effect of welding thermal cycles on the structure and properties of the material subjected to the tests. Related numerical models to be used as the basis for the analysis of temperature distribution in the test specimen have been developed. These tests involved the analysis of the values and the distribution of temperature in relation to various model parameters, i.e. thermocouple types, geometrical features of a thermocouple junction and the diameter of thermocouple wires. The results of FEM calculations have been compared to the experiments.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1405-1415
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysing applicability of selected methods to smooth indicator diagrams of marine medium-speed engine
Autorzy:
Pawletko, R.
Powiązania:
https://bibliotekanauki.pl/articles/259730.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
indicator diagrams
smoothing waveforms
filtering disturbances
Opis:
The article analyses the applicability of selected smoothing methods to smooth indicator diagram curves and to filter disturbances. An intermediate goal of the study was an attempt to extract disturbances recorded during pressure curve smoothing, which are believed to be a source of important diagnostic information. Within the framework of the reported analysis, a comparison was made between the moving average method, the Savitzky-Golay filter, and the frequency filtration method. The research was performed on a marine medium-speed engine Sulzer 3Al 25/30, which has a relatively long indicator passage.
Źródło:
Polish Maritime Research; 2015, 2; 55-61
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation accuracy of combustion chamber tightness in piston engines, on the basis of a developed indicator diagram
Autorzy:
Rosłanowski, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/246594.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
leakage of combustion chamber
errors of developed indicator diagrams
characteristic points of developed indicator diagrams
Opis:
The following article describes the effect of combustion chamber leakage of piston engine on the quality of its performance. To make a diagnosis of combustion chamber tightness, only such parameters were selected which are characterized by high information value and are closely connected with its defined structure. For this reason such connections are unmistakable, which results in making the right diagnosis of combustion chamber tightness of piston engines. Special attention was paid to the fact, what consequences, combustion chamber leakage, can cause to the piston engine performance. The most dangerous for the engine efficiency is the leakage of combustion chamber. The leakage of combustion chamber brings about the change of such engine parameters as pressure of suction, pressure of final compression and burning and the change of exhaust gases composition, which effect on the engine power and on fuel consumption. Condition of piston rings and their influence on gas pressure in combustion chamber has also been characterized. Pressure of gases taking place in engine cylinder and their connection with leakage of combustion chamber have also been described. The article also exposes random character of combustion pressure in engine cylinder. Besides, the errors of indicator diagrams together with mapping error position GMP have been mentioned too. Reliability of diagnostic parameters of technical condition of combustion piston engines obtained on the basis of developed indicator diagrams has been defined. Such diagram must be made on the basis of measurements and statistic analysis of pressure parameters in correctly adjusted engines, being in perfect technical condition, and not on the basis of measurements obtained in the engine test bench of a new engine. Bad technical condition, especially leaks in its cylinders causes power differences in engine arrangements, which endangers its safe exploitation.
Źródło:
Journal of KONES; 2013, 20, 3; 339-345
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic symptoms of piston combustion engines of ship main propulsion received from its developed indicator diagrams
Autorzy:
Rosłanowski, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244511.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
leakage of combustion chamber
errors of developed indicator diagrams
characteristic points of developed indicator diagrams
Opis:
The following article describes parameters of developed indicator diagrams concerning piston combustion engine of ship main propulsion, which can be used to assess its technical condition. To make a diagnosis of the engine combustion only such parameters should be selected which are characterized by high information value, being closely connected with its one defined structure. This is the cause why such connections are of unmistakable character, which allows to make the right diagnosis of technical condition of piston engine. Special attention was also paid to the consequences of diagnostic symptoms qualification from developed indicator diagrams of ship propulsion engine working in different conditions. Deflection of average indicated pressure caused by inappropriate engine performance could be caused by: 1) faulty adjustment of injection pump; 2) leaky combustion chamber, 3) bad technical condition of injection apparatus and the loading air system. Wrong technical condition of the engine caused by a leaky combustion chamber brings about a decrease of its performance. Untight combustion chamber causes the change of such parameters as, suction pressure, pressure of final compression and burning, as well as, the change of exhaust gases composition, which influences the power of the engine and fuel consumption. It has been mentioned what gas pressures of working process in engine cylinders are connected with an untight combustion chamber. Random character of burning pressure course in engine cylinder has also been paid attention to. Reliability of diagnostic parameters of piston engine technical condition received based on developed indicator diagrams have been determined. Diagnostic symptoms have been defined, basing on measurements and statistical analysis of pressure values in the cylinders of properly adjusted engines being in excellent technical condition and not based on measurements received in the engine test bed of a new engine.
Źródło:
Journal of KONES; 2013, 20, 2; 355-362
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety oriented bubble diagrams in project risk management
Autorzy:
Abrahamsen, E. B.
Aven, T.
Powiązania:
https://bibliotekanauki.pl/articles/2069566.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
bubble diagrams
project risk management
safety
Opis:
In project risk management many firms use bubble diagrams to get a graphical presentation of a project’s most uncertain attributes. The bubble diagrams and procedures used to put attributes into these diagrams are seen to provide a rational framework for managing risks. In this paper we review and discuss the use of these diagrams and procedures. Special attention is given to the way safety is treated. We show that the standard use of bubble diagrams is not adequate for identification and follow up critical activities that affect safety. The main problem is that the present structure means that the uncertainty is not properly taken into account. In this paper a reformulated bubble diagram is suggested that better reflects safety related uncertainties. The offshore oil and gas industry is the starting point, but the discussion is to large extent general.
Źródło:
Journal of Polish Safety and Reliability Association; 2008, 1; 1--5
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagramy FBD w środowisku programistycznym CPDev
FBD diagrams in CPDev programming environment
Autorzy:
Trybus, B.
Ziętek, A.
Powiązania:
https://bibliotekanauki.pl/articles/275184.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
programowanie
diagramy FBD
programming
FBD diagrams
Opis:
W artykule opisano rozszerzenie środowiska programistyczno-uruchomieniowego CPDev umożliwiające tworzenie aplikacji sterujących za pomocą diagramów bloków funkcjonalnych FBD. Edytor graficzny służy do tworzenia diagramów, zaś odpowiedni konwerter przekształca je do kodu w języku ST, który następnie jest kompilowany do postaci wykonywalnej. Do zapisu danych opisujących diagram FBD oraz bibliotekę bloków zastosowano format XML, w tym dokumenty o strukturze zgodnej ze standardem PLCOpen. Dzięki opisanemu rozszerzeniu środowisko CPDev pozwala obecnie na tworzenie aplikacji sterujących za pomocą trzech języków normy IEC 61131, tj. ST, IL i FBD.
The paper describes an extension of CPDev programming and runtime environment for building control applications using Function Block Diagrams (FBD). The diagrams are converted into ST language compiled into executable binary code. XML format derived from PLCOpen standard is used to store FBD structure and library of function blocks. Due to the extension, the CPDev environment supports now ST, IL and FBD languages of IEC 61131-3 standard.
Źródło:
Pomiary Automatyka Robotyka; 2010, 14, 3; 6-8
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie wykresów CTP niskostopowego żeliwa sferoidalnego do opracowania technologii wytwarzania żeliwa ADI
The use of TTT diagrams of low-alloy ductile cast iron to develop a technology for the production of ADI
Autorzy:
Mrzygłód, B.
Kluska-Nawarecka, S.
Kowalski, A.
Wilk-Kołodziejczyk, D.
Powiązania:
https://bibliotekanauki.pl/articles/391646.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
wykresy CTPc
wykresy CTPi
żeliwo sferoidalne
żeliwo ADI
struktura
CCT diagrams
TTT diagrams
ductile cast iron
ADI
structure
Opis:
Omówiono znaczenie wykresów CTPc i CTPi w procesach obróbki cieplnej żeliwa sferoidalnego, szczególnie przy wytwarzaniu żeliwa ADI. Dokonano przeglądu literatury dotyczącej zagadnienia. Badania własne obejmowały opracowanie wykresów CTP dla czterech rodzajów żeliwa sferoidalnego różniących się głównie zawartością dodatków niklu, miedzi i molibdenu, odpowiednio: 1,55% Ni i 0,73% Cu; 2,26% Ni i 1,44% Cu; 1,60% Ni i 0,69% Cu oraz 1,50% Ni i 0,45% Mo. Zamieszczono mikrostruktury produktów przemiany przechłodzonego austenitu z wybranych próbek wykorzystanych do budowy wykresu CTPc-4. Na podstawie analizy otrzymanych wykresów omówiono wpływ Ni, Cu i Mo na temperaturę i czas poszczególnych przemian fazowych żeliwa sferoidalnego podczas chłodzenia anizotermicznego i izotermicznego. Uzyskano właściwości żeliwa ADI z dodatkami 1,55% Ni i 0,73% Cu spełniające wymagania dla 4 gatunków wg normy EN-PN 1563.
The presented paper is a description of the significance of CCT and TTT diagrams in the processes of heat treatment of ductile cast iron, and especially during the production of ADI. A review of literature in the subject was made. Own research included drawing up TTT diagrams for four types of ductile cast iron which mainly differed with respect to the content of nickel, copper and molybdenum additions, respectively: 1.55% Ni and 0.73% Cu; 2.26% Ni and 1.44% Cu; 1.60% Ni and 0.69% Cu, as well as 1.50% Ni and 0.45% Mo. Presented are microstructures of products of overcooled austenite transformations from the selected samples used for the construction of a CCT-4 diagram. On the basis of the analysis of the achieved diagrams, the influence of Ni, Cu and Mo on temperature and time of particular phase transformations in ductile cast iron during anisothermal and isothermal cooling is discussed. Properties of ADI with additions of 1.55% Ni and 0.73% Cu were determined which meet the requirements for four types pf cast iron according to the standard EN-PN 1563.
Źródło:
Prace Instytutu Odlewnictwa; 2013, 53, 4; 85-111
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Square Ising Nanowire on the Bethe Lattice
Autorzy:
Albayrak, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032327.pdf
Data publikacji:
2017-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Bethe lattice
nanowire
phase diagrams
magnetization
tricritical
Opis:
The square-type nanowire is simulated on the Bethe lattice by using the core-shell structure consisting of the Ising spins. A nanoparticle is formed by placing a spin to the center and four others to the corners of a square. Then, each nanoparticle is combined with two neighboring ones with a perfect alignment of the squares to form the nanowire. Only nearest-neighbor spin interactions, either ferromagnetic or antiferromagnetic type, are allowed. The phase diagrams are calculated by studying the thermal variations of magnetizations for various values of bilinear interactions. It is found that the model gives both second- and first-order phase transitions in addition to the tricritical points and compensation temperatures.
Źródło:
Acta Physica Polonica A; 2017, 131, 6; 1470-1473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of determining mean indicator pressure of piston combustion engines from developed indicator diagrams
Autorzy:
Monieta, J.
Powiązania:
https://bibliotekanauki.pl/articles/244070.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engines
indicator diagrams
mean indicated pressure
Opis:
The paper presents methods for processing and analysis of in-cylinder pressure course in the combustion chamber of marine engines. In literature are described determinate methods ofmean indicator pressure from closed diagrams, with are but rarely recorded than developed diagrams. There have been showed on limitations occurrence at measurements fast-changed pressures of marine diesel engines in operating conditions and measuring errors the attendants. Mean indicated pressure determined from the indicated timing or angular pressure courses in the cylinders is still a reliable diagnostic symptom. The paper presents too the results of experimental measurement of in-cylinder pressure signals, medium speed marine engines with application resistive sensor and using the photo-optical sensor of crankshaft position, and without the marker position of the crankshaft. Not always possible to altach the marker for the position of the crankshaft, and even there is no way of stopping the engine when you need to diagnose it. The top dead centre of the piston can be determined then analytically. The work developed a method of determining the mean indicated pressure of the developed indicator diagrams. Based on calculations ofmean indicator pressure made many of diagnosis of the medium speed marine diesel engines in the operating conditions.
Źródło:
Journal of KONES; 2010, 17, 3; 301-306
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the indicator diagrams smoothing on the indicated parameters of marine diesel engines
Autorzy:
Pawletko, R.
Powiązania:
https://bibliotekanauki.pl/articles/244800.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
indicator diagrams
smoothing the interference
engine indicated parameters
Opis:
The topic of this article is to analyze the influence of indicator diagrams smoothing methods on diagnostic parameters determined on their basis such as the maximum combustion pressure, mean indication pressure and heat release characteristics. Indicator diagrams of marine engines are subject to serious distortions arising primarily from the measuring method for in-cylinder pressure. Measurements are performed on the indicator valve which connect with the combustion chamber through the indicator channel. Depending on the engine design the channel length can reach a considerable length and introduces significant distortion in both the phase and amplitude of the pressure signal. Further analysis of the indicator diagram eg. in order to determine the heat release characteristics requires the use of methods of smoothing and filtering of interference. The results confirm no effect of indicator diagram smoothing for the value of the mean indicated pressure, which is one for the most important indicated parameters. A significant influence of smoothing on the maximum value of the heat release rate was observed. The differences in this case exceed 50%. At the same time confirmed that the heat release rate curve determined on the basis of a diagram without smoothing, carry a high level of interference, which precludes their practical use. Smoothing allows getting heat release rate curves that carry vital information about the working process of the engine.
Źródło:
Journal of KONES; 2015, 22, 2; 169-176
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors affecting the design of instrument flight procedures
Czynniki wpływające na projektowanie procedur lotu według przyrządów
Autorzy:
Jun, F.
Kevicky, D.
Ferencz, I.
Powiązania:
https://bibliotekanauki.pl/articles/374639.pdf
Data publikacji:
2008
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
procedura lotu
schemat Ishikawy
flight procedure
Ishikava diagrams
Opis:
The article highlights factors, which might affect the design of instrument flight procedures. Ishikawa diagram is used to distribute individual factors into classes, as are People, Methods, Regulations, Tools, Data and Environment.
Artykuł przedstawia czynniki, które mogą wpływać na projektowanie procedur lotu według przyrządów. Schemat Ishikawy został użyty do rozdzielenia poszczególnych czynników na klasy, takie jak: Ludzie, Metody, Przepisy, Narzędzia, Dane oraz Środowisko.
Źródło:
Transport Problems; 2008, 3, 4; 53-57
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of indicator and heat release graphs for vw 1.9 tdi engine supplied diesel fuel and rapeseed methyl esters (RME)
Autorzy:
Cisek, J.
Powiązania:
https://bibliotekanauki.pl/articles/247568.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
RME
FAME
indicator diagrams
heat realise
diesel engine
Opis:
The results of investigation of 1,9 TDI engine (285 Nm, 85 kW, type AJM without any modification) equipped with injection units supplied conventional diesel fuel (ON) or B100 fuel (RME) have been presented in article. Investigations have been realized at the engine speed of 2000 rpm and variable load within the range of 0 to 275 Nm. The pressure, temperature and heat release velocity runs have been subjected to analysis. Particular attention has been paid to the release of the heat used for the effective work and internal energy increase of the working medium (enthalpy) during combustion inside the engine cylinder versus the crank angle for both investigated fuels. It was found among the others that mentioned fuels differ in the heat release, heat velocity and the maximal combustion temperature, which for the B100 fuel is bigger than for the conventional diesel fuel. Bigger combustion dynamics of tested biofuel (compared with standard diesel fuel) results higher concentrations of Nitrogen Oxides NOx in exhaust gases. The easiest way is of course the use of the later start of fuel injection biofuels and/or increase the exhaust gas recirculation EGR. These treatments, however, result in a worsening of the energy performance of the engine. It was concluded also that the combustion of RME works properly at higher engine loads. Then reduce the negative difference between the combustion of biofuel (RME) and standard Diesel fuel.
Źródło:
Journal of KONES; 2013, 20, 4; 71-78
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Algorithms and methods for analysis of the optical structure factor of fractal aggregates
Autorzy:
Mroczka, J.
Woźniak, M.
Onofri, F. R. A.
Powiązania:
https://bibliotekanauki.pl/articles/221757.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractals
aggregates
light scattering
scattering diagrams
structure factor
Opis:
We introduce numerical methods and algorithms to estimate the main parameters of fractal-like particle aggregates from their optical structure factor (i.e. light scattering diagrams). The first algorithm is based on a direct and simple method, but its applicability is limited to aggregates with large size parameter and intermediate fractal dimension. The second algorithm requires to build calibration curves based on accurate particle agglomeration and particle light scattering models. It allows analyzing the optical structure factor of much smaller aggregates, regardless of their fractal dimension and the size of the single particles. Therefore, this algorithm as well as the introduction of a criteria curve to detect the different scattering regimes, are thought to be powerful tools to perform reliable and reproducible analyses.
Źródło:
Metrology and Measurement Systems; 2012, 19, 3; 459-470
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Deformation and Austenitization Temperature on the Kinetics of Phase Transformations During Cooling of High-Carbon Steel
Autorzy:
Kawulok, P.
Podolinský, P.
Kajzar, P.
Schindler, I.
Kawulok, R.
Ševčák, V.
Opěla, P.
Powiązania:
https://bibliotekanauki.pl/articles/350975.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-carbon steel
cooling
transformation diagrams
microstructure
hardness
Opis:
The aim of the performed experiments was to determine the influence of deformation and of austenitization temperature on the kinetics of phase transformations during cooling of high-carbon steel (0.728 wt. % C). The CCT and DCCT diagrams for austenitization temperature 940°C and DCCT diagram for austenitization temperature 1000°C were constructed with the use of dilatometric tests. On the basis of obtained results, a featureless effect of austenitization temperature and deformation on the kinetics of phase transformations during cooling of investigated steel was observed. Critical cooling rates for the transformation of martensite in microstructure fluctuated from 5 to 7°C · s-1 (depending on the parameters of austenitization and deformation), but only at cooling rates higher than 8°C · s-1 a dominant share of martensite was observed in the investigated steel, which resulted in the significant increase of hardness.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1743-1748
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of time in influence diagrams
Autorzy:
Traczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/307809.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
niepewność
uncertainty
belief networks
influence diagrams
ordering in time
Opis:
An influence diagram is a compact representation emphasizing the qualitative features of decision problem under uncertainty. Classical influence diagram has parameters stable in time, determined order of suggested decisions and generally is independent of time. Here we have shown some possible methods of construction of time dependent influence diagrams: with decision ordering, time-sliced segments and time consuming nodes. Such gathering of methods can help in selection of a proper solution.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 3; 108-111
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 112

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