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Wyświetlanie 1-15 z 767
Tytuł:
"Semantic simulation engine" for mobile robotic applications
System symulacji semantycznej dla aplikacji robotów mobilnych
Autorzy:
Będkowski, J.
Masłowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/276939.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
roboty mobilne
symulacja semantyczna
mobile robots
semantic simulation
Opis:
In the paper the "Semantic Simulation Engine" dedicated for mobile robotics applications is shown. Presented software performs mobile robot simulation in virtual environment built from real 3D data that is transformed into semantic map. Data acquisition is done by real mobile robot PIONEER 3AT equipped with 3D laser measurement system. Semantic map building method and its transformation into simulation model (NVIDIA PhysX) is described. The modification of ICP (Iterative Closest Point) algorithm for data registration based on processor GPGPU CUDA (Compute Unified Device Architecture) is shown. The semantic map definition is given including the set of semantic entities and set of relations between them. Methods for localization and identification of semantic entities in 3D cloud of points based on image processing techniques are described. Results and examples of semantic simulation are shown.
W pracy przedstawiono system symulacji semantycznej "Semantic Simulation Engine" dedykowany aplikacjom robotów mobilnych. Oprogramowanie realizuje symulację robota mobilnego poruszającego się w wirtualnym środowisku powstałym na bazie rzeczywistych pomiarów 3D przekształconych w mapę semantyczną. Pomiary dokonane są z wykorzystaniem rzeczywistego autonomicznego robota mobilnego klasy PIONEER 3AT wyposażonego w laserowy system pomiarowy 3D. Przedstawiono metodę budowy mapy semantycznej oraz metodę transformacji tej mapy do modelu symulacyjnego (NVIDIA PhysX). Przedstawiono autorską modyfikację algorytmu ICP (Iterative Closest Point) zastosowaną do dopasowywania dwóch chmur punktów 3D z wykorzystaniem procesora GPGPU CUDA (Compute Unified Device Architecture). Przedstawiono założenia mapy semantycznej, w tym zbiór podstawowych elementów semantycznych oraz relacji między nimi. Omówiono autorskie metody lokalizowania oraz identyfikacji elementów semantycznych w chmurze punktów 3D z zastosowaniem technik przetwarzania obrazów. Pokazano przykłady działania opracowanego systemu symulacji semantycznej.
Źródło:
Pomiary Automatyka Robotyka; 2011, 15, 2; 333-343
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A biochemical multi-species quality model of a drinking water distribution system for simulation and design
Autorzy:
Arminski, K.
Zubowicz, T.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/907619.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
multi species
chloramine
quality
drinking water
distribution system
critical infrastructure system
chloramina
jakość
woda pitna
system dystrybucji
infrastruktura krytyczna
Opis:
Drinking Water Distribution Systems (DWDSs) play a key role in sustainable development of modern society. They are classified as critical infrastructure systems. This imposes a large set of highly demanding requirements on the DWDS operation and requires dedicated algorithms for on-line monitoring and control to tackle related problems. Requirements on DWDS availability restrict the usability of the real plant in the design phase. Thus, a proper model is crucial. Within this paper a DWDS multi-species quality model for simulation and design is derived. The model is composed of multiple highly inter-connected modules which are introduced to represent chemical and biological species and (above all) their interactions. The chemical part includes the processes of chloramine decay with additional bromine catalysis and reaction with nitrogen compounds. The biological part consists of both heterotrophic and chemo-autotrophic bacteria species. The heterotrophic bacteria are assumed to consume assimilable organic carbon. Autotrophs are ammonia oxidizing bacteria and nitrite oxidizing bacteria species which are responsible for nitrification processes. Moreover, Disinfection By-Products (DBPs) are also considered. Two numerical examples illustrate the derived model’s behaviour in normal and disturbance operational states.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 3; 571-585
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A computational fluid flow analysis of a disc valve system
Autorzy:
Czop, P.
Śliwa, P.
Gniłka, J.
Gąsiorek, D.
Wszołek, G.
Powiązania:
https://bibliotekanauki.pl/articles/244640.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
valve system
computational fluid flow analysis
simulation
Opis:
Noise concerns in shock absorbers can be divided into two categories. The first is fluid flow noise, or “swish noise”, caused by the oil being forced through openings in the valves. The type and temperature of the oil, its velocity and the orifice geometry all have an effect on this. In addition, the structural design of the shock absorber shell may either reduce or amplify the noise. The second type of shock absorber noise is often described as regular operational noise or “chuckle noise”. It can be observed in vehicles during low-displacement, higher-frequency events, such as driving over a slightly rough road. This effect measurable as a force discontinuity into the vehicle and can come from a number of sources in the shock absorber, e.g. hydraulic transitions. It is often traceable to the valve discs closing and opening, but can also be caused by cavitation/aeration in the oil and air being pulled through the valves. The work on noise improvement reported in this paper has been started using conventional shock absorbers to be extended and will cover in the future variable damping shock systems as well. The paper gives an overview about the configurations of a typical valve system including three basic regimes of operation, which correspond to the amount of oil flowing through a valve cavity. The aim of this work was to propose a finite element fluid flow model, which can be used in order to reduce the velocity of fluid flow through a cavity of a shock absorber valve. High flow velocity can cause high-content frequency vibrations and, in turn, audible noise. The model will be used for initial screening of new valve concepts and on the other hand to improve the currently use ones.
Źródło:
Journal of KONES; 2011, 18, 1; 117-122
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of modification and simulation studies of a mechatronic stair transporter for the disabled
Autorzy:
Wudarczyk, S.
Muraszkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/387538.pdf
Data publikacji:
2015
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
computational model
stair transporter
operator relief system
model numeryczny
wózek transportowy
wózek dla niepełnosprawnych
transport osób niepełnosprawnych
konstrukcje wózków inwalidzkich
systemy transportowe
osoby niepełnosprawne
Opis:
A numerical model of existing stair climber with its passenger was built and its operation was analysed through simulations. A modification of the stair climber has been developed on a basis of the simulation studies. The modification depends on equipping the device with additional controllable mechanism the function of which is to change the position of the passenger’s centre of gravity. Comparative simulation studies were carried out for the standard version and the modified version of the stair transporter in a system for the dynamic.
Źródło:
Acta Mechanica et Automatica; 2015, 9, 4; 213-218
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dynamic model for the heat transfer behavior of a cooling system
Autorzy:
Liu, Wen
Zhang, Chi
Hu, Xiao-Xiong
Cao, Jian-Bo
Liu, Li-Jiao
Ye, Xin-Y
Lin, Li
Qi, Xun-Ji
Powiązania:
https://bibliotekanauki.pl/articles/2050060.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
adsorption system
refrigerating system
desorption
simulation
Opis:
For purposes of studying the heat transfer behavior of various fluids in a refrigeration system, a dynamic model is established, obtained on the basis of analysis concerning the effects of adsorption velocity, adsorbent bed temperature, condensing temperature, and heat transfer fluids, as well as changes of external conditions. It is demonstrated that adsorption velocity increases sharply in the initial phase of adsorption process and gradually declines after reaching a peak value, whereas condensing temperature increases sharply in the initial phase of desorption process and decreases after reaching a peak value with the desorption quantity decreasing. Furthermore, the increase of heat source temperature and the decrease of cooling water temperature can advance the adsorption process. The present study therefore suggests some ways of improving the performance of such a refrigeration system by increasing heat source temperature, decreasing ambient air temperature, increasing return air temperature and decreasing cooling water temperature.
Źródło:
Control and Cybernetics; 2020, 49, 3; 315--332
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A dynamic submerging motion model of the hybrid-propelled unmanned underwater vehicle: Simulation and experimental verification
Autorzy:
Talarczyk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/11542696.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
autonomous underwater vehicle
hybrid propulsion system
biomimetic underwater vehicle
dynamic diving
diving model
autonomiczny pojazd podwodny
układ napędowy hybrydowy
biomimetyczny pojazd podwodny
nurkowanie dynamiczne
Opis:
Hybrid propulsion in underwater vehicles is the new idea of combining conventional propulsion systems such as screw propellers with other kinds of propulsion like oscillating biomimetic fins, glider wings or jet thrusters. Each of these propulsion systems has its own benefits and drawbacks, and the goal is to have them complement each other in certain conditions. This paper covers the topic of a dynamic model of the pitch and heave motion of the HUUV (hybrid unmanned underwater vehicle) using screw propellers and biomimetic lateral fins. Firstly, the simulation model of the vehicle performing depth and pitch change is presented. Secondly, the vehicle’s hydrodynamic coefficients obtained from CFD simulations are discussed. Thirdly, the results of the HUUV experimental studies in a swimming pool are presented. Lastly, simulation results are compared with those of the experiment to verify the correctness of the model. The vehicle’s motion in the swimming pool during the experiments was recorded using a submerged camcorder and then analysed using the Tracker software.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2023, 33, 2; 207--218
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test
Autorzy:
Liu, Zhong-Zhong
Wang, Han-Peng
Yuan, Liang
Wang, Wei
Zhang, Chong
Xue, Yang
Powiązania:
https://bibliotekanauki.pl/articles/1848966.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stress measurement system
sealing technology
hyperbaric environment
coal and gas outburst
gas-solid coupling
Opis:
A film stress measurement system applicable for hyperbaric environment was developed to characterize stress evolution in a physical simulation test of a gas-solid coupling geological disaster. It consists of flexible film pressure sensors, a signal conversion module, and a highly-integrated acquisition box which can perform synchronous and rapid acquisition of 1 kHz test data. Meanwhile, we adopted a feasible sealing technology and protection method to improve the survival rate of the sensors and the success rate of the test, which can ensure the accuracy of the test results. The stress measurement system performed well in a large-scale simulation test of coal and gas outburst that reproduced the outburst in the laboratory. The stress evolution of surrounding rock in front of the heading is completely recorded in a successful simulation of the outburst which is consistent with the previous empirical and theoretical analysis. The experiment verifies the feasibility of the stress measurement system as well as the sealing technology, laying a foundation for the physical simulation test of gas-solid coupled geological disasters.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 73-88
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A High Performance Digital Time Interval Spectrometer: An Embedded, FPGA-Based System With Reduced Dead Time Behaviour
Autorzy:
Arkani, M.
Powiązania:
https://bibliotekanauki.pl/articles/221045.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
time interval spectrum
stochastic process
TDC
dead time effect
Monte Carlo simulation
FPGA
Opis:
In this work, a fast 32-bit one-million-channel time interval spectrometer is proposed based on field programmable gate arrays (FPGAs). The time resolution is adjustable down to 3.33 ns (= T, the digitization/discretization period) based on a prototype system hardware. The system is capable to collect billions of time interval data arranged in one million timing channels. This huge number of channels makes it an ideal measuring tool for very short to very long time intervals of nuclear particle detection systems. The data are stored and updated in a built-in SRAM memory during the measuring process, and then transferred to the computer. Two time-to-digital converters (TDCs) working in parallel are implemented in the design to immune the system against loss of the first short time interval events (namely below 10 ns considering the tests performed on the prototype hardware platform of the system). Additionally, the theory of multiple count loss effect is investigated analytically. Using the Monte Carlo method, losses of counts up to 100 million events per second (Meps) are calculated and the effective system dead time is estimated by curve fitting of a non-extendable dead time model to the results (τNE = 2.26 ns). An important dead time effect on a measured random process is the distortion on the time spectrum; using the Monte Carlo method this effect is also studied. The uncertainty of the system is analysed experimentally. The standard deviation of the system is estimated as ± 36.6 × T (T= 3.33 ns) for a one-second time interval test signal (300 million Tin the time interval).
Źródło:
Metrology and Measurement Systems; 2015, 22, 4; 601-619
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A high-accuracy method of computation of X-ray waves propagation through an optical system consisting many lenses
Autorzy:
Kshevetskii, S.
Wojda, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938594.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska
Tematy:
X-ray wave
X-ray optic
lens
non-uniform medium
focusing
numerical method
simulation
finite differences
stability
numerical error
wave phase
electromagnetic wave
fast oscillating function
Opis:
The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated mathematically and investigated. The presented results for equations show that in order to establish a high accuracy computation a much smaller number of points is needed to solve the problem of X-ray waves propagation through a multi-lens system when the method for the second equation is used. The reason for such a result is that the electric field of a wave after passing through many lenses is a quickly oscillating function of coordinates, while the electric field phase is a quickly increasing, but not oscillating function. Therefore, a very detailed difference grid, which is necessary to approximate the considered electric field can be replaced by not such a detailed grid, when computations are made for the complex wave of the electric field. The simulation error of both suggested methods is estimated. It is shown that the derived equation for a phase function allows efficient simulation of propagation of X-rays for the multi-lens optical system.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 171-186
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybrid scheduler for many task computing in big data systems
Autorzy:
Vasiliu, L.
Pop, F.
Negru, C.
Mocanu, M.
Cristea, V.
Kolodziej, J.
Powiązania:
https://bibliotekanauki.pl/articles/907647.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
many task computing
scheduling heuristics
QoS
big data system
simulation
obliczenia wielofunkcyjne
szeregowanie zadań
duży zbiór danych
Opis:
With the rapid evolution of the distributed computing world in the last few years, the amount of data created and processed has fast increased to petabytes or even exabytes scale. Such huge data sets need data-intensive computing applications and impose performance requirements to the infrastructures that support them, such as high scalability, storage, fault tolerance but also efficient scheduling algorithms. This paper focuses on providing a hybrid scheduling algorithm for many task computing that addresses big data environments with few penalties, taking into consideration the deadlines and satisfying a data dependent task model. The hybrid solution consists of several heuristics and algorithms (min-min, min-max and earliest deadline first) combined in order to provide a scheduling algorithm that matches our problem. The experimental results are conducted by simulation and prove that the proposed hybrid algorithm behaves very well in terms of meeting deadlines.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2017, 27, 2; 385-399
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A layered multiagent decision support system for crisis management
Autorzy:
Kebair, F.
Powiązania:
https://bibliotekanauki.pl/articles/91749.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
decision support systems
DSS
case of crisis
multi-agent
RoboCupRescue simulation system
Opis:
Decision Support Systems are powerful tools to help support making decisions. However, they are known to be customized for a specific purpose and can rarely be reused. Moreover, they do not support complex situations sufficiently. Our work addresses this challenge and consists in building a DSS that aims to help emergency managers to manage cases of crisis. The DSS is designed to be flexible and adaptive, so that it may be applied on different subjects of studies and whose behaviour may change with the change of its environment. We endowed it therefore with a multiagent layered core whose role is to represent dynamically and in real time the current situation, to characterize it and to compare it with past known scenarios. The final result of the DSS will help decision-makers to analyze the current crisis and its possible evolution. The RoboCupRescue simulation system is chosen as a test bed to illustrate and to test this approach.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 2; 125-132
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
Autorzy:
Palus, Mateusz
Pianko-Oprych, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/1849273.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dynamic model
natural gas
Solid Oxide Fuel Cell stacks
Combined Heat and Power
CHP
system
Balance of Plant
BoP
modelling
Catalytic Partial Oxidation
CPOx
reformer
steam reformer
Opis:
Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A mathematical model of two-stage Solid Oxide Fuel Cell, SOFC, stacks for dynamic simulation of Combined Heat and Power system fed by natural gas
Autorzy:
Palus, Mateusz
Pianko-Oprych, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/1849268.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dynamic model
natural gas
Solid Oxide Fuel Cell stacks
Combined Heat and Power
CHP
system
Balance of Plant
BoP
modelling
Catalytic Partial Oxidation
CPOx
reformer
steam reformer
Opis:
Zero-dimensional two-stage SOFC stacks dynamic model was developed to investigate the effect of operating parameters on stacks performance. The model resolves spatially thermal and thermo-electrochemical behaviour for electrochemical reactions, Catalytic Partial Oxidation and Steam Reforming processes. Design variables and thermo-electrochemical properties were obtained from in-house-fabricated SOFCs carried out by project partners. The completed SOFCs based Combined Heat and Power, CHP, system model was validated by data18 and numerical results obtained at steady-state mode showing its high-fidelity. A parametric study with respect to key operating parameters including changes in fuel utilization, lambda number and current density values was conducted. The global CHP system dynamic response, in term of the current/voltage delivered by two-stage SOFC stacks, under a fi xed fuel utilization, has been determined resulting in greater variations in the voltage of a single cell in the first stack in comparison to the corresponding values in the second stack.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 2; 1-11
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for reserve determination of the static and dynamic list of liquefied natural gas carriers and its application to the dynamic under keel clearance system in the outer port in Świnoujście
Autorzy:
Drwięga, K.
Gucma, L.
Gralak, R.
Powiązania:
https://bibliotekanauki.pl/articles/135146.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
dynamic UKC
simulation methods
analytical methods
list
pressure transmitters
LNG carrier
Opis:
This paper presents a methodology for determining the components related to the heel of liquefied natural gas (LNG) carriers, excluding the heel of the vessel due to waves. The described method was applied to the description of under keel clearance of vessels approaching the outer port of Świnoujście. The method includes the determination of heel components caused by: draught reading errors, wind, current, tugboats and vessel maneuvers. Determination of the last component was carried out using a 2-stage method. In the first stage, simulation methods were used to identify the parameters of ship movement. In the second stage, the maximum heel of LNG carriers was calculated by analytical methods.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 66-73
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 767

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