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Wyświetlanie 1-15 z 241
Tytuł:
Simulation modeling of stationary systems reliability
Autorzy:
Wesołowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/93055.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
system reliability
modeling
simulation modeling
stochastic simulation
Opis:
A purpose of the article is describing the methodology of the simulation modeling of systems reliability. At the work is assumed that the process of the use of the studied system is stationary. An algorithm of the simulation applying the technique of discrete-event was presented. An example of using the proposed methodology to the reliability analysis of the air traffic control system was quoted.
Źródło:
Studia Informatica : systems and information technology; 2012, 1-2(16); 45-58
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of simulation and genetic algorithm with different genetic operators to optimize manufacturing system
Autorzy:
Wiśniewski, T.
Rymaszewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/118181.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
genetic algorithm
simulation modeling
manufacturing system
Opis:
The article depicts an evolutionary approach to simulation based optimization of a typical manufacturing system. Genetic algorithm with four different variants of genetic operators (crossover operator and type of selection) is compared to find the best optimization method. A comprehensive discussion of the genetic algorithm results obtained from the simulation model was also presented.
Źródło:
Applied Computer Science; 2013, 9, 1; 34-45
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historical-pedagogical analysis of model and simulation development as a part of tactical training of military professionals
Autorzy:
KOS, Mykola
Powiązania:
https://bibliotekanauki.pl/articles/455537.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Rzeszowski
Tematy:
simulation and modeling
imitation
modeling
simulation
model
Opis:
We have provided a short description of development of models and simulation of tactical and strategic actions in training of military professional. We believe that better and more rigorous research of development and new trends of models and simulation is needed in order to gain the necessary knowledge on how to use their experience in development of perspective systems of models and simulation of combat actions for Ukrainian Armed Forces. This is especially true for the training of future officers in Military Higher Education Institutions. A further line of research may be the analysis of development of national models and simulation of various actions in military sphere, particularly in system of military education.
Źródło:
Edukacja-Technika-Informatyka; 2013, 4, 1; 410-412
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal gas transport management taking into account reliability factor
Autorzy:
Grudz, Volodymyr
Grudz, Yaroslav
Zapukhliak, Vasyl
Chudyk, Ihor
Poberezhny, Lubomyr
Slobodyan, Nazar
Bodnar, Vitaliy
Powiązania:
https://bibliotekanauki.pl/articles/409687.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
optimization of gas supply
reliability
simulation modeling
technological losses
Opis:
In the period of shortage of gas supply, special attention is given to reducing the supply of gas to its consumers, that is, their complete and uninterrupted gas supply. Increasing gas losses associated with technological transportation costs, in particular caused by gas flow instability and frequent changes in gas transmission network operating modes. Considering losses due to unreliability of gas pumping is one of the important tasks of gas supply optimization. The purpose of the study is to develop an optimization mathematical model that will simultaneously take into account the factors of reliability and minimum lossesIn the general case, the optimization calculations of the modes of operation of the main gas pipelines are intended to solve three main problems: determining the maximum productivity, calculating the optimal mode with a given productivity and choosing the optimal strategy, the development of the pipeline. On the basis of approaches of simulation modeling of complex systems, a multiparameter mathematical model of gas supply process optimization was developed. It is shown that a comparative analysis of the forecast and actual indicators of the operating modes of the plunger gas pumping unit shows their satisfactory convergence. The performance of the compressor operation period in the process of injection according to the forecast deviates from the actual value for the whole period of operation of the plunger gas pumping unit in 2016 by 2.98%. The optimization problem of gas pumping planning is considered, taking into account the expected losses, on the basis of which the transfer of the controlled system from the initial state to the final one is carried out by such a sequence of states that minimizes the total cost of the system evolution.
Źródło:
Management Systems in Production Engineering; 2020, 3 (28); 202-208
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Modeling Process of the Materials Management System in a Manufacturing Company Based on the System Dynamics Method
Autorzy:
Baran, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/475185.pdf
Data publikacji:
2013
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
simulation modeling
system dynamics
materials in a manufacturing company
Opis:
The article presents the steps of modeling of the material management system in a manufacturing company. First, the modeling procedures indicating by Forrester, Łukaszewicz, Souček, Tarajkowski and Sterman were described and the essence of materials management in a manufacturing company was presented. Next, modeling of the materials management system was shown - step by step. Initially, the variables of the mental model connected with materials were defined, then variables in casual loop diagrams were linked. Diagrams were transformed into a simulation model that has been verified. The validation of the simulation model was conducted by using the following methods: assessing the correctness of the boundary of modeling, adequacy of the model structure and adopted values (constants) compared with available knowledge about the modelled system; test of the accuracy and consistency of the units of variables adopted in the model and test of the model behavior in extreme conditions. The study endpoints included the simulation of the model on empirical data, which were collected in the company Alpha and test of the “what ... if ...”. The test showed that the small changes in control norms (constants), which control the system, could have influenced to more rational management of that system.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2013, 9, 2; 79-96
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation modeling in GPSS for optimizing the traffic lights cycle of adjustable crossroads
Autorzy:
Kravchenya, Irina
Lebid, Iryna
Powiązania:
https://bibliotekanauki.pl/articles/2141049.pdf
Data publikacji:
2020
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
simulation modeling
adjustable crossroads
traffic lights cycle
queuing systems
Opis:
The problem of traffic management, especially in big cities is particularly actual. Due to unavoidable motorization increase in number of vehicles has resulted in congestion, traffic jams, difficulty of the movement of pedestrians, increasing the number of accidents. Traffic jams are undesirable because of higher fuel consumption, increased pollution due to exhaust gases as well as noise, etc. The only way to avoid harmful consequences is to optimize the operation of the traffic lights cycle. The purpose of the work is creation the simulation model in GPSS for determining the optimal traffic lights cycle at adjustable crossroads when managing vehicle flows with specified intensities. The mathematical model of adjustable crossroads can be presented as a queuing system. Development of the simulation model includes several stages: programming in GPSS, verification and assessment of the adequacy. The algorithm for optimizing the traffic lights cycle and diagrams are used to find the optimal value of the cycle. The minimum intersection travel time (including time of queuing) is selected as the optimal criterion. The object of study is the traffic lights cycle regulation of the intersection Sovietskaya St. – Rogachevskaya St. – Telman St. in Gomel, Belarus. The existing traffic lights cycle regulation at the intersection Sovietskaya str. – Rogachevskaya str. – Telman str. has been studied. Simulation modeling of the intersection has been created in GPSS and traffic light cycle optimization algorithm has been developed. According to a worked out algorithm the traffic lights cycle at research intersection during saturation flux has been improved. Transport delays both at the existing and optimized crossings have been estimated. Optimization of the traffic lights cycle will increase the traffic capacity of the intersection, reduce the volume of toxic emissions and decrease the accident risk. The developed simulation model can be modified for other types of intersections and used as the basis for a decision support system based on low-level simulation.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2020, 5, 1; 48-55
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the risk classification of cruise ship fires based on an attention-BP neural network
Autorzy:
Xiong, Zhenghua
Xiang, Bo
Chen, Ye
Chen, Bin
Powiązania:
https://bibliotekanauki.pl/articles/32912853.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
cruise fire
simulation modeling
ensemble learning
BP neural network
Opis:
Due to the relatively closed environment, complex internal structure, and difficult evacuation of personnel, it is more difficult to prevent ship fires than land fires. In this paper, taking the large cruise ship as the research object, the physical model of a cruise cabin fire is established through PyroSim software, and the safety indexes such as smoke temperature, CO concentration, and visibility are numerically simulated. An Attention-BP neural network model is designed for realizing the intelligent identification of a cabin fire and dividing the risk level, which integrates the diagnosis results of multiple neural network models through the self-Attention mechanism and adaptively distributes the weight of each BP neural network model. The proposed model can provide decision-making reference for subsequent fire-fighting measures and personnel evacuation. Experimental results show that the proposed Attention-BP neural network model can effectively realize the early warning of the fire risk level. Compared with other machine learning algorithms, it has the highest stability and accuracy and reduces the uncertainty of early cabin fire warning.
Źródło:
Polish Maritime Research; 2022, 3; 61-68
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation modeling of HM-networks with consideration of positive and negative messages
Autorzy:
Naumenko, V.
Matalytski, M.
Powiązania:
https://bibliotekanauki.pl/articles/122640.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
HM-network
incomes
negative messages
simulation modeling
HM-sieci
dochody
modelowanie symulacyjne
Opis:
In the article an open Queueing Network (QN) with positive and negative messages and incomes, which can be used in modeling of the behavior of viruses at the Information Systems and Networks (ISN), and also at forecasting costs taking into account virus penetration, was analyzed. Some numerical and analytical results were described on the analysis of exponential QN of the above type. It was given an algorithm of simulation modeling (SM) of HM-networks with positive and negative messages, based on the 0-point, which allows you to find incomes in such networks with arbitrary distribution of service times of positive messages. The results of the SM have been compared with the proposed analytical and numerical results. Sufficiently high accuracy of these methods was shown.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 2; 49-60
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD model of the CNG direct injection engine
Autorzy:
Czyż, Z.
Pietrykowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/957987.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
simulation and modeling
gas injection
methane injection
direct injection
Opis:
The paper presents CFD analysis of fuel flow in the CNG injector. The issues such a pressure drop along an injector channel, mass flow through the key sections of the injector geometry, flow rates, the impact of the needle shape on the deflection of the sprayed gas cone and the impact of the wall head are analyzed in the article. The simulation was made in the transient states conditions for full injection process, including the opening and closing of the injector. An injection time of 6 ms, velocity of 0.33 mm/ms and a lift of 0.5 mm were selected for opening and closing of injector based on experimental test. The simulation shows that the volume inside the injector is a kind of fuel accumulator, and the opening process of the needle influence the flow parameters in an inlet cross-section after a certain time, depending on a channel cross section. The calculations allowed to select the ratio of an injector duct cross sectional area to the aperture area of the injection capable of the reducing pressure loss. The unusual location of the injector in the socket of a glow plug in the Andoria ADCR engine makes a stream be impaired by a part of the head. This research result would be useful in developing an injector construction which will be used for an investigation of CNG addition into diesel engine.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 23; 45-52
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości wykorzystania dynamicznie przydzielanych priorytetów w poligrafii
Analysis of usage dynamic priority rules in printing industry
Autorzy:
Wiśniewski, T.
Rymaszewski, S.
Korytkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/395617.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
priorytety dynamiczne
produkcja poligraficzna
modelowanie symulacyjne
dynamic priorities
commercial offset printing system
simulation modeling
Opis:
W artykule przedstawiono koncepcję zarządzania procesem produkcyjnym w dru-karni w oparciu o dynamiczne reguły priorytetowe. Koncepcja zakłada, że przed każdym stanowiskiem roboczym będzie podejmowana decyzja o wyborze kolejnego zadania do obsłużenia. Przedstawione w artykule badania symulacyjne pokazują jak zmienia się efektywność produkcji w zależności od przyjętej dynamicznej reguły priorytetowej.
In article was presented an approach in management of the printing production process based on dynamic priority rules. The concept assumes that before any working post a decision will be taken about the next task to handle. Presented in this paper simulation studies show how the efficiencyof production depends on the adopted dynamic priority rule.
Źródło:
Postępy Nauki i Techniki; 2012, 13; 14-24
2080-4075
Pojawia się w:
Postępy Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Model of GPRS Channels Operation as a Part of the Railway Traffic Coordination System
Autorzy:
Akhmetov, Bakhytzhan
Lakhno, Valeriy
Yerkeldessova, Gulzada
Sarzhanov, Taizhan
Issaikin, Dmitriy
Powiązania:
https://bibliotekanauki.pl/articles/963800.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dispatch control automation
railway transport
data transmission
GPRS technology
simulation modeling
algorithm
block diagram
Opis:
The paper analyzes the prospects for the formation and implementation of digital data transmission technologies on railways of Kazakhstan, taking into account the potential for the development of high-speed railway transport (HSRWT), as well as new approaches for solving the development problems of advanced automated dispatch control systems (ADCS). It was shown that the solution of these problems is possible by automatization of the train traffic coordination based on the use of the potential of the GPRS data transmission technology. The work further developed models and algorithms used in ADCS of the railway transport. There has been carried out the formalization of the tasks of navigation data transmission for ADCS and for the subsystems of the railway rolling stock movement coordination, including HSRWT using GPRS data transmission technology. Also, the article describes a modernized algorithm for simulation of the GPRS channels operation in ADCS. The proposed algorithm differs from the existing ones by the ability to make predictive estimates for determination of the railway rolling stock location. Also, the developed algorithm provides opportunities for coordination of the trains movement, taking into account the optimization of the GPRS resources use.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 485-490
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of simulation modeling in the design of elements of annular preventers
Autorzy:
Dzhus, Andriy
Romanyshyn, Liubomyr
Mykhailiuk, Vasyl
Mosora, Yurii
Powiązania:
https://bibliotekanauki.pl/articles/2064396.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
simulation modeling
stress-strain state
annular preventer
modelowanie symulacyjne
stan naprężenie-odkształcenie
zabezpieczenie pierścieniowe
Opis:
One of the main elements of control over wells in the process of their construction is the blowout equipment, which includes annular preventers. This also applies to wells that provide degassing of coal veins to reduce their gas dynamic activity. Modern technology of work requires expansion of the functionality of the sealing unit of the annular preventers with the simultaneous provision of its operational characteristics. Determining the necessary durability of seals for different operating modes is the study of their stress-strain state. The paper deals with the possibility of using simulation modeling in the annular preventers design situations and within the study of the armature geometry influence of the sealant fittings on its stress-strain state. The method of determining the material constants to realize the Mooney-Rivlin model has been proposed. The behavior of low-density rubber in software product has been described by the finite element method. The aggregation error of experimental and theoretical studies is 5%. Therefore, the preconditions and the possibility of using simulation modeling in the design of annular preventers devices with increased operational characteristics have been created and confirmed.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 295--303
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated Approaches to Determination of CO2 Concentration and Air Rate Exchange in Educational Institution
Autorzy:
Deshko, Valerii
Bilous, Inna
Vynogradov-Saltykov, Volodimer
Shovkaliuk, Maryna
Hetmanchuk, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/1811612.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
educational institution
air quality
СО2 concentration
air exchange
simulation modeling
field experiment
comfort conditions
Opis:
Many old public buildings in Central and Eastern Europe are characterized by low energy efficiency and often lack of mechanical ventilation. The general trends are aimed to improve the energy efficiency of the building sector and to provide comfort conditions. The indoor air quality can be determined based on the CO2 concentrations. In the article, a complex approach to the definition and analysis of data on the indoor CO2 concentration and the air exchange rate in educational institutions at natural air exchange and in the absence of mechanical air circulation was implemented. Educational institutions in Kyiv have been considered. The study of the CO2 concentration of indoor and outdoor air of three typical schools of mass development in the 80 s, as well as the training building of Igor Sikorsky KPI, was carried out. Experimental determination of the background CO2 concentration during the day next to the considered objects showed that the background concentration of CO2 is in the range of 400-420 ppm. Measurements of the CO2 concentration distribution were carried out after classes throughout the classroom area, according to which the difference between the values at the level of the working area was 30...180 ppm. It was found that the concentration of CO2 varies during classes between 700-1100 ppm. During the break, the CO2 concentration decreases to 500-1000 ppm, depending on the type of ventilation. Experimental data on the dynamics of changes in the indoor CO2 concentration are used to determine the air exchange rate based on balances of air flows and CO2. It is shown that the number of present persons influences the indoor CO2 concentration more significantly than the air exchange rate. On the example of an experimental study of the CO2 concentration in the classrooms for high school students it was found that the air exchange rate during the classes is in the range of 0.4...0.75 h-1. During breaks the air exchange rate increases to 2.9-3.5 h-1. For the range considered, the weighted average air exchange rate is 0.8 h-1, and even with forced airing, the air exchange rate is insufficient to ensure acceptable CO2 concentration. For the training building of Igor Sikorsky KPI a field experiment was carried out to determine the dynamics of changes in CO2 concentration in time and on the basis of it the air exchange rates for representative classrooms were determined. The concentration of CO2 ranged from 500 to 2000 ppm and increases by 350-850 ppm depending on the use and location of classrooms. Based on experimental data, the air exchange rate for the training building of the education institution is in the range of 0.35-0.7 h-1. During the periods of airing the air exchange may increase by 0.45 h-1, but this does not allow reaching the standard value. When analyzing the obtained results, simulation models of natural air exchange of the examined classrooms were used on the basis of the improved ASHRAE method. The natural air exchange rate based on simulations is in the -0.8…0.5 h-1 range. Negative values are explained by exfiltration, which is typical for the upper floors. Not only the comfort and condition of the building envelope, but also the total energy consumption of the building depend on the actual level of air exchange rate. In the total energy balance the ventilation component is 30-60%. Further use of the obtained results can be connected with monitoring of the actual level of air exchange rate and its consideration during complex modernization or implementation of the ventilation systems with heat recovery in the premises of educational institutions.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 82-104
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of transport-and-handling sites operation within metallurgical enterprises
Symulacja pracy kompleksów transportowo-przeładunkowych przedsiębiorstw metalurgicznych
Моделирование работы транспортно-грузовых комплексов металлургических предприятий
Autorzy:
Parunakjan, V.
Aksenov, M.
Sizova, E.
Powiązania:
https://bibliotekanauki.pl/articles/375470.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
freight station
simulation modeling
transport-and-handling site
dworzec towarowy
modelowanie symulacyjne
kompleks transportowo-przeładunkowych
Opis:
In terms of existent regime of transport-and-handling sites operation, the necessity in enhancing the efficiency of production and transport interaction is justified. For this purpose simulation model of transport-and-handling site, which provides reception of raw materials, is developed.
Обоснована необходимость повышения эффективности взаимодействия производства и транспорта в рамках существующего режима функционирования транспортно-грузовых комплексов металлургических предприятий. С этой целью разработана имитационная модель транспортногрузового комплекса приёма сырья.
Źródło:
Transport Problems; 2013, 8, 3; 121-129
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation modeling for evaluation of efficiency of observed ship coordinates
Autorzy:
Vorokhobin, I.
Burmaka, I.
Fusar, I.
Burmaka, O.
Powiązania:
https://bibliotekanauki.pl/articles/2172471.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
ship coordinates
observed ship coordinates
simulation modeling
lines of position
LOP errors
method of least squares
Opis:
Simulation computer modeling was used to evaluate the efficiency of the vessel’s observed coordinates using the mixed laws of distribution errors of the first and second type for lines of position (LOP). Simulation modeling showed good convergence of evaluation of efficiency calculated by analytical expressions and obtained by simulation. A graphical depiction of the observed points’ deviation relative to the mathematical expectation in the case of distribution of LOP errors of both types according to mixed laws is obtained by the method of least squares and the method of maximum likelihood estimation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 137--141
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
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