Wszystkie pola: Diagrams - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

Tytuł:: Assessing diagnostic applicability of heat release characteristics determined based on ship engine indicator diagrams
Autorzy:: Polanowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/258814.pdf
Data publikacji:: 2009
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: ship piston engines
indicator diagrams
heat release
characteristics
diagnostic application
Opis:: In order to determine indicator diagrams-based heat release characteristics, a single- zone model of net heat release was used for perfect gas. It was proved that when a constant value for isentropic exponent is assumed, the error in determining the characteristics can be limited to 1% at the nominal load. The effect of errors in determining the position of piston TDC, as well as that of gas passages and indicator valves on the calculated characteristics was evaluated. It was shown that for low-speed engines the effect of gas passages in negligible, while for medium-speed engines the characteristics reveal some deformations (waves), which are repeatable for an individual cylinder in the examined engine construction. The results of the performed investigations and analyses suggest possibility and advisability of the use of heat release characteristics in diagnosing ship engines, in particular low-speed machines.
Źródło:: Polish Maritime Research; 2009, 3; 32-35
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Empirical formulas for calculating Continuous Cooling Transformation diagrams
Autorzy:: Trzaska, J.
Powiązania:: https://bibliotekanauki.pl/articles/366696.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: computational materials science
steel
regression analysis
CCT diagrams
obliczeniowa nauka o materiałach
stal
regresja
wykresy CTPc
Opis:: Purpose: The paper presents empirical formulas for the calculation of Continuous Cooling Transformation (CCT) diagram basing on the chemical composition and austenitizing temperature. Design/methodology/approach: In the method of calculating CCT diagrams proposed in the paper, two types of tasks are solved. First task is classification and consists in determining the range of cooling rate for particular phase transformations. The second task is regression, which aims at calculating the transformations temperature, hardness and volume fraction of phases in steel. The model of CCT diagrams was developed using multiple regression and logistic regression methods. Research limitations/implications: CCT diagrams can be calculated according to the presented method, if the chemical composition of steel meets the criteria defined by the application range of the model. Practical implications: The formulas presented in the article can be used to determine the conditions for heat treatment of structural steels. Originality/value: The paper presents the method for calculating CCT diagrams of the structural steels and engineering steels, depending on their chemical composition as well as austenitizing temperature.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2019, 97, 1; 21-30
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Eksploatacja wykresów CTP_i w systemie CAPCAST
The exploitation of TTT diagrams in the CAPCAST system
Autorzy:: Mrzygłód, B.
Adrian, A.
Regulski, K.
Olejarczyk-Wożeńska, I.
Kluska-Nawarecka, S.
Powiązania:: https://bibliotekanauki.pl/articles/391789.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:: wykres CTPi
żeliwo sferoidalne
digitalizacja wykresów
właściwości mechaniczne żeliwa
TTT diagrams
ductile cast iron
diagrams digitisation
mechanical properties of cast iron
Opis:: Artykuł stanowi opis działania jednego z modułów systemu CAPCAST, umożliwiającego rekomendację materiałów z żeliwa sferoidalnego, posiadających określone właściwości lub mogących osiągnąć oczekiwane właściwości po przeprowadzeniu odpowiedniej obróbki cieplnej. Podejście opiera się na wykorzystaniu wiedzy zawartej w wykresach CTP_i do określenia warunków obróbki cieplnej, w efekcie której można uzyskać pożądaną mikrostrukturę żeliwa zapewniającą oczekiwane właściwości materiału.
The presented paper is a description of one of the modules of the CAPCAST system which allows determination of recommended materials made of ductile cast iron which show specific properties or may achieve the desired properties after an appropriate heat treatment process. The approach is based on the application of the knowledge developed from the TTT diagrams in order to establish the heat treatment conditions to achieve the desired microstructure of cast iron and thereby the expected properties of the material.
Źródło:: Prace Instytutu Odlewnictwa; 2013, 53, 4; 45-56
1899-2439
Pojawia się w:: Prace Instytutu Odlewnictwa
Dostawca treści:: Biblioteka Nauki

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