Temat: computational modelling - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The simulation of performance characteristics of port injection dedicated compressed natural gas spark ignition engine
Autorzy:: Semin, Semin
Abu Bakar, R.
Ismail, A.
Powiązania:: https://bibliotekanauki.pl/articles/950139.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: CNG engine
computational modelling
engine performance
port/sequential injection
Opis:: This paper presents the computational modelling simulation results of port/sequential injection dedicated compressed natural gas (CNG) spark ignition engine to investigate and evaluate the engine performance while base engine converted by using compressed natural gas as an alternative fuel. The baseline engine in this research is four stroke direct injection diesel engine. The computational modelling design and development has performed using GT-Power software at Automotive Excellent Centre Laboratory, Faculty of Mechanical Engineering, University Malaysia Pahang, Malaysia. To investigate the engine performance, the engine computational model is operated between 500-4000 rpm, under steady state condition. In this research, the sequential injection dedicated compressed natural gas spark ignition engine performance investigation results such as torque, power, fuel consumption pressure and exhaust gas emissions were investigated and compared to base diesel engine performance. From the CNG engine computational modelling simulation results are shown that by development of sequential injection dedicated compressed natural gas spark ignition engine has a potential to reduce the engine emissions. Unfortunately, the development of sequential injection dedicated compressed natural gas spark ignition engine can be reducing the engine performance. However, the study of required to improve the performance of sequential injection dedicated compressed natural gas spark ignition engine has a potential of reducing engine.
Źródło:: Journal of KONES; 2008, 15, 2; 427-432
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modeling and Performance Evaluation of an Electromagnetic Voltage Regulator via Series Compensation
Autorzy:: Brito, Vinícius Henrique Farias
Oliveira, José Carlos de
Santilio, Fabricio Parra
Powiązania:: https://bibliotekanauki.pl/articles/136200.pdf
Data publikacji:: 2020
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Tematy:: computational modelling
distribution system
electromagnetic voltage regulator
performance evaluation
power quality
voltage regulation
Opis:: Although there currently exists a wide range of voltage regulators that are commercially available, the search for devices with a simpler physical design remains the focus of research studies. Following this line, an electromagnetic voltage regulator (EVR) arrangement has been proposed. The EVR is constituted of an autotransformer that supplies, via discrete taps, a series transformer that injects voltage for regulating the feeder voltage. Even though its operating principle is shown as being similar to that of other devices on the market, the physical arrangement and operating strategy of EVR show novelties which result in properties such as: economic attractiveness, constructive simplicity, and operational reliability. Moreover, when installing voltage regulators, efficacy studies must be carried out to optimize equipment design. In this context, this paper aims at evaluating the factors that influence the effectiveness of the EVR in restoring voltage variations according to the determinations imposed by regulatory agencies. The ultimate goal of this study is to determine the voltage deviation range that the EVR is able to restore. To achieve this goal, a mathematical modeling of the EVR is given and study cases are computationally carried out to investigate its performance when connected to a typical distribution feeder.
Źródło:: Transactions on Environment and Electrical Engineering; 2020, 4, 1; 12-17
2450-5730
Pojawia się w:: Transactions on Environment and Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Predicting word order universals
Autorzy:: Merlo, P.
Powiązania:: https://bibliotekanauki.pl/articles/103843.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Tematy:: frequency
word order universals
Greenberg’s Universal 20
computational modelling
probabilistic models
Naive Bayes
Opis:: This paper shows a computational learning paradigm to compare and test theories about language universals. Its main contribution lies in the illustration of the encoding and comparison of theories about typological universals to measure the generalisation ability of these theories. In so doing, this method uncovers hidden dependencies between theoretical dimensions and primitives that were considered independent and independently motivated.
Źródło:: Journal of Language Modelling; 2015, 3, 2; 317-344
2299-856X
2299-8470
Pojawia się w:: Journal of Language Modelling
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: CFD modelling of complete thermal cycle of SI engine
Modelowanie pelnego cyklu cieplnego silnika ZI
Autorzy:: Jamrozik, A.
Tutak, W.
Powiązania:: https://bibliotekanauki.pl/articles/793217.pdf
Data publikacji:: 2012
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:: spark ignition engine
internal combustion engine
thermal cycle
modelling
AVL FIRE software
simulation
computational modelling
exhaust emission
numerical calculation
combustion process
Źródło:: Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:: Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A thermodynamic analysis of a gas-steam turbine incorporating a full model of a spray – ejector condense
Autorzy:: Ziółkowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/175324.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: computational ﬂow mechanics modelling
two-phase ejector
thermodynamic analysis
numerical analysis
Opis:: The speciﬁc issues that occur in the mathematical modelling of a spray-ejector condenser have been presented. The results of a thermodynamic analysis of a steam-gas turbine cycle have been obtained by computational ﬂow mechanics code. The main aim of the spray-ejector condenser is simultaneously condensing steam and compressing CO2 from the condensation pressure to about 100 kPa. Hence, the most important innovation of this steam-gas cycle emerges as the enhanced condensation, which is based on the nano-injection of cold water and a jet-powered compression of CO2 performed in the spray-ejector condenser.
Źródło:: Transactions of the Institute of Fluid-Flow Machinery; 2018, 139; 63-96
0079-3205
Pojawia się w:: Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Modelowanie komputerowe układów prostowniczych jedno- i trójfazowych z obciążeniem RL
Computational modelling one and three-phase rectifier with RL load
Autorzy:: KWATER, Tadeusz
TWARÓG, Bogusław
PĘKALA, Robert
BARTNIK, Karol
Powiązania:: https://bibliotekanauki.pl/articles/455152.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Rzeszowski
Tematy:: modelowanie komputerowe
równania różniczkowe zwyczajne
schematy połączeń obwodów elektrycznych
dioda
tyrystor
przebiegi symulacyjne
computational modelling
ordinary differential equations
scheme electrical circuits
diode
thyristor
simulation waveforms
Opis:: W artykule przedstawiono problematykę dotyczącą modelowania komputerowego układów prostowniczych jedno- i trójfazowych z obciążeniem typu RL. Podano założenia upraszczające oraz schematy połączeń elektrycznych i odpowiadające im równania różniczkowe zwyczajne. Zamieszczono rezultaty eksperymentów numerycznych potwierdzających ich zgodność z przebiegami rzeczywistymi
This paper presents issues concerning computational modelling systems one and three-phase rectifier with a load RL. Given the simplifying assumptions and the wiring diagrams and the corresponding ordinary differential equations. Contains the results of numerical experiments confirming their compliance with the actual waveforms
Źródło:: Edukacja-Technika-Informatyka; 2013, 4, 2; 351-357
2080-9069
Pojawia się w:: Edukacja-Technika-Informatyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Zastosowanie Zintegrowanego Systemu Modelowania Materiałów i Procesów Inżynierskich (ICME) w odlewnictwie
The application of Integrated Computational Materials Engineering (ICME) in foundry practice
Autorzy:: Pysz, S.
Piekło, J.
Powiązania:: https://bibliotekanauki.pl/articles/391548.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:: odlew
ICME
Integrated Computational Materials Engineering
modelowanie
cast
modelling
Opis:: W artykule przedstawiono najnowocześniejsze tendencje w zakresie wykorzystania symulacji komputerowej w procesie opracowywania nowych rozwiązań, w tym również rozwiązań w branży odlewniczej. Opisano działanie Zintegrowanego Systemu Modelowania Materiałów i Procesów Inżynierskich (ang. Integrated Computational Materials Engineering – ICME) zaakceptowanego w roli wiodącego narzędzia w opracowywaniu nowych materiałów, konstrukcji oraz technologii w przemyśle lotniczym, motoryzacyjnym, okrętowym, energetyce w USA oraz w Unii Europejskiej. Prześledzono funkcjonowanie zintegrowanego systemu w procesie opracowywania konstrukcji odlewanej przez modelowanie stanów naprężeń podczas pracy odlewu, modelowanie właściwości stopu oraz samej technologii. Przedstawiono zagrożenia i korzyści ze stosowania systemu.
This article presents the latest tendencies within the scope of the application of computer simulation in the process of developing new solutions, including solutions in foundry practice. The functioning of Integrated Computational Materials Engineering is described, which is regarded as a leading tool for developing new materials, constructions and technologies in aerospace, automotive and maritime industries in the USA and the European Union. The functioning of ICME was studied in the process of developing a cast construction by modelling stresses of the cast at work, modelling alloy properties and the technology itself. Threats and benefits resulting from the application of ICME are also presented.
Źródło:: Prace Instytutu Odlewnictwa; 2013, 53, 4; 57-70
1899-2439
Pojawia się w:: Prace Instytutu Odlewnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Computational Fluid Dynamics Modeling of Residence Time Distribution in a Field-Scale Horizontal Subsurface Flow Constructed Wetland with Palm Kernel Shell as Substrate
Autorzy:: Okoye, Nelson Mbanefo
Madubuike, Chimaobi Nnaemeka
Nwuba, Ifeanyi Uba
Orakwe, Louis Chukwuemeka
Ugwuishiwu, O. Boniface
Powiązania:: https://bibliotekanauki.pl/articles/1163287.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: COMSOL
Computational Fluid Dynamics
Constructed Wetland
Simulation Modelling
Wastewater Treatment
Opis:: The hydraulic performance of constructed wetlands is often compromised by hydraulic problems. Therefore, the development of an appropriate simulation model to reliably predict how various modifications of bed design and configurations might affect performance will facilitate the design of efficient systems. The aim of this research work is to determine distribution of residence time in a field-scale horizontal subsurface flow constructed wetland with Palm Kernel Shell as substrate. The governing equations of flow in porous media and transport of diluted species were solved using COMSOL Multiphysics 5.3a. The result was validated using experimental data and the model result showed good agreement with a correlation coefficient of 0.99. Alternative wetland designs were assessed for the same flow conditions. The results revealed that a two cell wetland improved short-circuiting flow paths.
Źródło:: World Scientific News; 2018, 109; 60-70
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Jet and droplet breakup modelling approaches
Autorzy:: Kapusta, Ł. J.
Jaworski, P.
Kowalski, J.
Powiązania:: https://bibliotekanauki.pl/articles/245813.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: spray
modelling
simulation
breakup
injection
CFD
computational fluid dynamics (CFD)
Opis:: Three-dimensional computational fluid dynamics (CFD) plays important role in engines development. The mixture formation in a direct-injection piston engines poses a huge challenge in successful simulations of the engine processes. It is due to the fact that the spray as a two-phase flow complicates the computational process. Moreover, this multiphase flow is not uniform. Three main zones, depending on the distance from the nozzle exit are visible when a liquid is injected. Very dense so called “thick” in a direct vicinity of the injector hole, than “thin” as a result of pri-mary breakup downstream the injector and finally in the certain distance from the injector appears “very thin” region as a result of secondary breakup. It is important to take into account that the liquid phase in various regimes behaves differently and is under influence of different phenomena. The modelling approach needs to take in to consideration all those elements. This paper focuses on presentation of the theory and numerical models for primary and secondary breakup phenomena. The primary breakup is a process that results from a combination of three mechanisms: turbu-lence within liquid phase, implosion of cavitation’s bubbles and aerodynamic forces acting on a liquid jet. Secondary breakup regime occurs mainly due to the aerodynamic interactions between the liquid and the gaseous phase.
Źródło:: Journal of KONES; 2015, 22, 3; 83-90
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Agent‐based modelling of macroeconomic shocks in a banking sector
Autorzy:: Dadej, Mateusz
Powiązania:: https://bibliotekanauki.pl/articles/518023.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Gdański. Wydział Ekonomiczny
Tematy:: macroeconomics
banking sector
agent‐based modelling
macroeconomic shocks
computational economics
Opis:: This paper presents an agent‐based model of banking sector, which includes three kinds of heterogenous agents – households, borrowers and banks. Households provide funds to the banking sector via deposits and are changing their bank of choice stochastically. Borrowers are main source of demand for liquidity in this system, which they utilize for a risky undertaking, that may not succeed, thus defaulting on a loan. And finally banks act as an intermediary between two previous agents and manage their simple balance sheet. Agents interact with each other, establishing a time‐varying equilibrium, that is able to receive an endogenous macroeconomic shock and return to the equilibrium, which may not be in the same place or may exhibit different characteristics depending on type of the shock. The simulation introduces shocks to the three variables, namely minimal reserve ratio, probability of default and capital adequacy ratio. The work also compares drawbacks and advantages of agent‐based models to the commonly used equation‐based models, such as dynamic stochastic general equilibrium models.
Źródło:: Zeszyty Studenckie Wydziału Ekonomicznego „Nasze Studia”; 2020, 10; 9-22
1731-6707
Pojawia się w:: Zeszyty Studenckie Wydziału Ekonomicznego „Nasze Studia”
Dostawca treści:: Biblioteka Nauki

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