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Wyświetlanie 1-15 z 45
Tytuł:
On the regularization error of state constrained Neumann control problems
Autorzy:
Krumbiegel, K.
Rosch, A.
Powiązania:
https://bibliotekanauki.pl/articles/969594.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
elliptic equation
state constraints
boundary control
regularization
virtual control
Opis:
A linear elliptic optimal control problem with point-wise state constraints in the interior of the domain is considered. Furthermore, the control is given on the boundary with associated constraints. An artificial distributed control is introduced in the cost functional, in the state equation and in the state constraints. Since there are no control constraints for the artificial control, efficient numerical methods can be easily established. Based on a possible violation of the pure pointwise state constraints, an error estimate for the regularization error is derived. The theoretical results are illustrated by numerical tests.
Źródło:
Control and Cybernetics; 2008, 37, 2; 369-392
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and control of an omnidirectional mobile manipulator
Autorzy:
Djebrani, S.
Benali, A.
Abdessemed, F.
Powiązania:
https://bibliotekanauki.pl/articles/330102.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
manipulator mobilny
sterowanie impedancyjne
logika rozmyta
holonome mobile manipulators
input state linearization
virtual impedance control
fuzzy logic
Opis:
A new approach to control an omnidirectional mobile manipulator is developed. The robot is considered to be an individual agent aimed at performing robotic tasks described in terms of a displacement and a force interaction with the environment. A reactive architecture and impedance control are used to ensure reliable task execution in response to environment stimuli. The mechanical structure of our holonomic mobile manipulator is built of two joint manipulators mounted on a holonomic vehicle. The vehicle is equipped with three driven axles with two spherical orthogonal wheels. Taking into account the dynamical interaction between the base and the manipulator, one can define the dynamics of the mobile manipulator and design a nonlinear controller using the input-state linearization method. The control structure of the robot is built in order to demonstrate the main capabilities regarding navigation and obstacle avoidance. Several simulations were conducted to prove the effectiveness of this approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 601-616
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robin Heart system moelling an training in virtual reality
Autorzy:
Nawrat, Z.
Koźlak, M.
Powiązania:
https://bibliotekanauki.pl/articles/384441.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
surgical robot
virtual reality
control
Opis:
Paper presents prototype surgical robot Robin Heart. It is computer-controlled and based on EON reality software. The structure control and motion possibilities of the robot are shown. Then its working in virtual reality environment is described. For less invasive surgery 3D issues are crucial.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 2; 62-66
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation tests of adaptive control strategies for CNC machine tools
Autorzy:
Stryczek, Roman
Szczepka, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/100146.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
adaptive control
processing simulation
virtual reality
intelligent machining
Opis:
The issue addressed in the article concerns the current needs and possibilities of computer-aided design of adaptive control strategies in machining processes. A simulative method of selecting the adaptive feed control strategy while rough turning materials difficult to machine, effective and inexpensive in its implementation, based on controlling the load placed on the machine's drives, has been presented. The results of a number of virtual tests of the proposed feed control strategy have been included, while paying particular attention to the stability of the machining process during moments of sudden change in the machining allowance. The obtained results meet the accepted quality indicators of the control algorithm. At the same time, the experiences collected by the author while conducting the tests confirmed the complexity of the issue and the resulting necessity to implement a comprehensive simulation testing program.
Źródło:
Journal of Machine Engineering; 2019, 19, 2; 73-82
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information technologies in the context of virtual organizations development
Autorzy:
Kalinowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/384231.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
competitiveness economy
virtual enterprise
management
control systems
knowledge economy
Opis:
The aim of this paper is to present the influence of information technologies (IT) on the organization structure, particularly in the context of virtual organizations’ (VO) development. The work describes examples and new models of virtual organizations. Subject connected with this type of organization is comparatively young and has appeared in the Internet era. Thanks to the development of communication technology enterprises can function in more elastic and competitive way: in innovative virtual forms. This new type of organizations will enlarge their market share. There are possibilities to reduce costs and be more competitive in the same time. Electronic and computer systems make the fundaments of the virtual organization management. Main activities of such organization are: information flow control, planning, production, service, distribution of products, and promotion. In the global economy virtual projects can be perceived as an optimal model of the organization activity. The new organizations are aiming to reinforce their competitive position, as well as to increase the profitability; they have also to take care of the smallest project details, the exact control of costs and optimisation of schedules. Virtual projects and organizations are still not well recognized. New researches should be taken up in this field.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 3; 58-61
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic Strategies for Autonomous Virtual Characters
Autorzy:
Lach, E.
Powiązania:
https://bibliotekanauki.pl/articles/93027.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
genetic programming
task control
machine learning
virtual characters animation
Opis:
Technique presented in the paper concerns automatic generation of strategies controlling virtual characters’ behaviour. Virtual people are currently widely used in many applications, especially in computer games, films and educational systems. A lot of researches focus on creating intelligent characters capable of deciding about their actions. The fully acceptable solution has not yet been found. The paper presents the problem of generating strategies by means of modified genetic programming. A new Guide-Path technique is introduced.
Źródło:
Studia Informatica : systems and information technology; 2007, 2(9); 57-68
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of holonic manufacturing systems
Autorzy:
Van Brussel, H.
Valckenaers, P.
Powiązania:
https://bibliotekanauki.pl/articles/99591.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
holonic manufacturing systems
integration
control
reference architecture
virtual execution
Opis:
The introduction of CIM (Computer Integrated Manufacturing) systems in the 1980s, aiming at integrating automatic workstations into fully automated factories, was not successful. The root causes of this failure were that the subsystems to be integrated were not suitably designed for easy integration into a larger system. This situation stimulated the authors to embark on a research programme on ‘design for the unexpected’. It defined how subsystems have to be designed so that integration into larger systems becomes easier and how such an integrated system can be controlled so that it can cope with change and disturbances. In the paper, the design principles and salient features of holonic manufacturing systems (HMS) are outlined. The PROSA reference architecture, defining the basic structure of any HMS, is described. It is further explained how coordination and control of the HMS is achieved by a holonic manufacturing execution system (HMES), based on the combination of the PROSA reference architecture and a biologically inspired Delegate Multiagent System (DMAS). Finally, the power and universality of the PROSA/DMAS system is demonstrated by some case studies from manufacturing, robotics and open air engineering.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 5-23
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency control of voltage sourced converter-based multi-terminal direct current interconnected system based on virtual synchronous generator
Autorzy:
Li, Congshan
Zhang, Xiaowei
He, Ping
Zhen, Zikai
Zhao, Kefeng
Powiązania:
https://bibliotekanauki.pl/articles/27309962.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
adaptive droop control
power margin
VSG
virtual synchronous generator
Opis:
In response to the inability of the flexible DC transmission system connected to the AC grid under conventional control strategies to provide inertia to the system as well as to participate in frequency regulation, a virtual synchronous generator (VSG) control strategy is proposed for a voltage source converter (VSC)-based multi-terminal high-voltage direct current (VSC-MTDC) interconnection system. First, the virtual controller module is designed by coupling AC frequency and active power through virtual inertia control, so that the VSC-MTDC system can provide inertia response for AC grid frequency. Second, by introducing the power margin of the converter station into the droop coefficient, the unbalanced power on the DC side is reasonably allocated to reduce the overshoot of the DC voltage in the regulation process. Finally, the power regulation capability of the normal AC system is used to provide power support to the fault end system, reducing frequency deviations and enabling inter-regional resource complementation. The simulation model of the three-terminal flexible DC grid is built in PSCAD/EMTDC, and the effectiveness of the proposed control strategy is verified by comparing the conventional control strategy and the additional frequency control strategy.
Źródło:
Archives of Electrical Engineering; 2023, 72, 4; 971--986
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Double Panel Structure for Active Control of Noise Transmission
Autorzy:
Morzyński, L.
Szczepański, G.
Powiązania:
https://bibliotekanauki.pl/articles/176968.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
noise
sound insulating enclosure
active structural acoustic control
virtual microphone
Opis:
Passive noise reduction means are commonly used to reduce noise in the industry but, unfortunately, their effectiveness is poor in the low frequency range. By applying active structural acoustic control to the enclosure walls significant improvement of the insulating properties in this frequency range can be achieved. In this paper a model of double panel structure with ASAC is presented. The structure consists of two aluminium plates separated by an air gap. Two inertial magnetoelectric actuators and two piezoceramic MFC sensors were used for controlling the structure. A multichannel FxLMS algorithm with virtual error microphone technique is used as a control algorithm. The signal of a virtual error microphone is extrapolated basing on signals from MFC sensors. Performance of this actively controlled structure for tonal signals at selected frequencies is presented in the article. During the study, a double panel structure was mounted on one wall of sound insulating enclosure located in an acoustic chamber. During the measurements local and global reduction of noise test signal was investigated.
Źródło:
Archives of Acoustics; 2018, 43, 4; 689-696
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quiet Zone for the patient in an Ambulance : Active Noise Control Technology for Siren Noise Reduction
Autorzy:
Sharma, M. K.
Vig, R.
Pal, R.
Shantharam, V.
Powiązania:
https://bibliotekanauki.pl/articles/177099.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active noise control
ANC
virtual sensing technique
ambulance siren noise
zone of silence
feedforward ANC
virtual ANC
Opis:
This paper proposes an active noise control (ANC) application to attenuate siren noise for the patient lying inside ambulance with no sound proofing. From the point of cost effectiveness, a local ANC system based on feedforward scheme is considered. Further, to handle the limitation of limited Zone of Silence (ZoS), the ANC based on virtual sensing is explored. The simulations are done in MATLAB for the recorded ambulance siren noise signal. The results indicate that ANC can be an effective solution for creating a silent environment for the patient.
Źródło:
Archives of Acoustics; 2018, 43, 2; 275-281
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
Autorzy:
Khanjanzadeh, Amir
Soleymani, Soodabeh
Mozafari, Babak
Powiązania:
https://bibliotekanauki.pl/articles/2090692.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PFDC
power-frequency droop control
VPP
virtual power plant
microgrid
virtual impedance
decentralized control
kontrola spadku częstotliwości zasilania
wirtualna elektrownia
mikrosieci
wirtualna impedancja
zdecentralizowana kontrola
Opis:
In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136190, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
Autorzy:
Khanjanzadeh, Amir
Soleymani, Soodabeh
Mozafari, Babak
Powiązania:
https://bibliotekanauki.pl/articles/2173517.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PFDC
power-frequency droop control
VPP
virtual power plant
microgrid
virtual impedance
decentralized control
kontrola spadku częstotliwości zasilania
elektrownia wirtualna
mikrosieci
wirtualna impedancja
zdecentralizowana kontrola
Opis:
In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136190, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A flexible control strategy for shoreto- ship power system in terms of gridconnected and off-grid switch
Autorzy:
Ji, Z.
Zhao, Z.
Wang, J.
Lv, Z.
Powiązania:
https://bibliotekanauki.pl/articles/259487.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
shore power supply
ship power system
virtual synchronous generator
flexible control
Opis:
There are promising application prospects for applying the shore power technology to the ships in the port for the purpose of pollution prevention. However, the grid-connection of the shore power supply to the ship power grid leads to current surges, damages the ship power consumption equipment, and results in the instability of the ship power grid system, which will seriously affect the reliability of the operation of the ship power grid system. In order to address this problem, the mathematical model of virtual synchronous generator is introduced in this paper. Then, a control method for the flexible grid-connection of the shore power supply to the ship power grid based on the virtual synchronous generator is proposed. Next, the output characteristics of the shore power supply are optimized to match the characteristics of the ship generator, which contributes to the flexible grid-connection of the shore power supply to the ship power grid system. The effectiveness and the feasibility of this method are verified by simulation and experiments.
Źródło:
Polish Maritime Research; 2018, S 2; 139-148
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Simulation of Conveyor Control System Using the Virtual Commissioning and Virtual Reality
Autorzy:
Ružarovský, Roman
Holubek, Radovan
Sobrino, Daynier Rolando Delgado
Janíček, Matej
Powiązania:
https://bibliotekanauki.pl/articles/102430.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
simulation
conveyor control
sensors integration
virtual commissioning
virtual reality
symulacja
kontrola przenośnika
integracja czujników
wirtualne uruchamianie
wirtualna rzeczywistość
Opis:
Designing of the conveyors and its control system with control program through the design tool “Virtual Commissioning” is very important in the digital era Industry 4.0. Virtual Commissioning was recently used to perform realistic virtual simulations in the early stages of development processes in automation of the conveyors too. The main benefit is the possibility of integrating and testing the control system through the simulation on the virtual model even before physically constructing the conveyor. The contribution focuses on the possibilities of transforming a real conveyor into a virtual model in the Siemens Tecnomatix Process Simulate program and integrating the Siemens S7-300 real control system to control the conveyor itself. In the model it was allowed to test and perform numerous variations and situations without physical intervention into the real conveyor and possible damage functional parts including through virtual reality. These experiments were subsequently evaluated and the control system optimized with respect to material flow and the developed PLC code on virtual model was verified on real conveyor control system.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 4; 164-171
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Virtual Reality for Stroke Rehabilitation: assessment, training and the effect of virtual therapy
Rzeczywistość wirtualna w rehabilitacji poudarowej – badania, trening i efekty terapii wirtualnej
Autorzy:
Kiper, Paweł
Turolla, Andrea
Piron, Lamberto
Agostini, Michela
Baba, Alfonc
Rossi, Simonetta
Tonin, Paolo
Powiązania:
https://bibliotekanauki.pl/articles/1957144.pdf
Data publikacji:
2010
Wydawca:
Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:
Stroke
rehabilitatio
virtual reality
motor control
udar mózgu
rehabilitacja
rzeczywistość wirtualna
kontrola ruchu
Opis:
The motor function impairment deriving from stroke injury has a negative impact on autonomy and on the activities of daily living. Several studies have demonstrated that learning new motor skills is important to induce neuroplasticity and functional recovery. To facilitate the activation of brain areas and consequently neuroplasticity, it may be advantageous to combine traditional motor rehabilitation with innovative technology, in order to promote motor re-learning and skill re-acquisition by means of an enhanced training. Following these principles, exercises should involve multiple sensory modalities exploiting the adaptive nature of the nervous system, in order to promote active patient participation. Movement re-learning could be improved by means of training in an enriched environment focused on optimizing the affordances between the motor system and the physical environment: virtual reality technologies allow for the possibility to create specific settings where the affordances are optimized. Several autors report that patients treated in virtual representation could, in both acute and chronic stroke, improve their arm motor function. Reinforced Feedback in a Virtual Environment (RFVE), can incorporate the elements necessary to maximize motor learning, such as repetitive and differentiated task practice, feedback of performance and results, and reinforcement of the motivation. The RFVE approach may lead to better rehabilitation outcomes in the treatment of the upper limb in stroke patients.
Upośledzenie funkcji ruchowych związanych z udarem mózgu ma w przypadku wielu chorych negatywny wpływ na samodzielność i na czynności Ŝycia codziennego i osoby te muszą być poddawane długotrwałej rehabilitacji. Liczne badania wykazały, że uczenie się nowych umiejętności motorycznych pobudza neuroplastyczność mózgu i w efekcie umożliwia poprawę funkcjonalną. W celu ułatwienia aktywacji obszarów mózgu, a w konsekwencji neuroplastyczności, korzystne może być łączenie tradycyjnej rehabilitacji ruchowej z innowacyjną technologią tak, aby poprzez wzmocniony trening promować ponowne uczenie się ruchu i ponowne nabywania umiejętności funkcjonalnych. W myśl tej zasady, wykorzystując adaptacyjne zdolności układu nerwowego, ćwiczenia powinny angażować wiele zmysłów i wymuszać aktywny udziału pacjenta. Trening ponownego uczenia się ruchu może być skuteczniejszy we wzbogaconym przez sprzężenie zwrotne środowisku koncentrując się na optymalizacji intrakcji osoby z komputerem między układem ruchu a fizycznym środowiskiem: technologia rzeczywistości wirtualnej dopuszcza możliwość utworzenia specjalnych ustawień, gdzie interakcja człowieka z komputerem jest zoptymalizowana. Wzmocnione sprzężenie zwrotne w środowisku wirtualnym (RFVE) może zawierać elementy potrzebne do maksymalizacji efektu uczenia się ruchu, np. praktyka powtarzających się i zróżnicowanych zadań, zastosowanie sprzężenia zwrotnego w odniesieniu do działania i efektu działania, oraz zwiększona motywacja. Zastosowanie RFVE może prowadzić do lepszych wyników w usprawnianiu niedowładnej kończyny górnej u pacjentów z udarem mózgu
Źródło:
Medical Rehabilitation; 2010, 14(2); 23-32
1427-9622
1896-3250
Pojawia się w:
Medical Rehabilitation
Dostawca treści:
Biblioteka Nauki
Artykuł
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