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1
Content available Development of the automatic control system of pumping station for urban water supply
Pistun E., Yakymchuk N.
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
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2014
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nr 2
68--71
EN
The analysis of the automatic control of water intake area of the pumping station, which is based on a controller with fuzzy logic and systematization using seasonally and hourly water consumption by using wavelet transforms.
PL
Analiza automatycznej kontroli poboru wody pompowni, opartej jest na regulatorze rozmytym i systematyzacji na podstawie sezonowego i godzinowego zużycia wody z wykorzystaniem transformaty falkowej.
2
Content available Normalized finite fractional differences: Computational and accuracy breakthroughs
Stanisławski R., Latawiec K. J.
International Journal of Applied Mathematics and Computer Science
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2012
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Vol. 22, no. 4
907-919
EN
This paper presents a series of new results in finite and infinite-memory modeling of discrete-time fractional differences. The introduced normalized finite fractional difference is shown to properly approximate its fractional difference original, in particular in terms of the steady-state properties. A stability analysis is also presented and a recursive computation algorithm is offered for finite fractional differences. A thorough analysis of computational and accuracy aspects is culminated with the introduction of a perfect finite fractional difference and, in particular, a powerful adaptive finite fractional difference, whose excellent performance is illustrated in simulation examples.
3
Real interpolation method in automatic control systems self-adjustment problem
Goncharov V., Rudnicki V.
Systems Science
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2010
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Vol. 36, no 3
33-37
EN
Practice demonstrates that most of existing methods and techniques of adjustment of the automatic control systems cannot provide the appropriate quality of the systems performing. That is why nowadays main attention is paid to adaptive methods and algorithms. In this paper, the Real Interpolation Method is offered for creation of adaptive Automatic Control Systems. It is based on use of a special case of the Laplace transformation, when the complex variable p = delta + j*omega comes to real part delta. Due to this approach the number of operations is decreased more than twice in comparison with the frequency domain methods and it considerably simplifies algorithms of self-adjustment of Automatic Control Systems.
4
Content available Key technologies for sustainable manufacturing
Uhlmann E., Koenig J.
Journal of Machine Engineering
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2008
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Vol. 8, No. 1
5--10
EN
Innovative production techniques require an efficient utilization of human, material and energetic resources to ensure competitive manufacturing positions. The aim of modern industrial production processes is to provide products with a higher added value in a shorter time-to-market. On the other hand, shorter life cycles of products are contrary to the necessity of expanded service time of manufacturing systems. Moreover, the whole life cycle of products is accompanied by customer related service provisions. Flexible and adaptive as well as self-organising means of production are a considerable key to solve this conflict of objectives. Here, man with specific technological knowledge has to be integrated with it's permanently newly defined role in production. This paper presents production technology related new developments and strategies to fulfil the requirements of sustainable manufacturing.
5
Content available Pyro-adaptive impact energy absorber
Ostrowski M., Griskevicius P., Holnicki-Szulc J.
Journal of KONES
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2007
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Vol. 14, No. 1
303-309
EN
The paper contains a proposal of energy dissipation density controlling in lightweight thin walled structures by reducing their crushing stiffness during an impact process. For small scale laboratory experiments, low-energy-dissipation absorber was developed. Prismatic absorber made of thin lead sheets can dissipate the impact energy at two energy density levels. Moving the concept to the real steel or aluminum structures can lead to satisfying value of the Specific Energy Absorption indicator with possible control of the energy dissipation. Experimental and FE explicit simulation results showing controllable impact process of a thinwalled prismatic absorber with rectangular crossection are presented. The control of crushing forces proved to be possible and efficient. Adaptivity ratio achieved in the presented example was 35%. The idea of the presented absorber was based on automotive front rail shape. The experimental tests have to be re-conducted. Geometry of the tested absorber should be modified to facilitate the detachment process of the stiffening members.
6
Adaptativnye i intellektual’nye sistemy dlâ rešeniâ zadač upravleniâ poletom perspektivnyh bespilotnyh letatel’nyh apparatov
Brusov V., Tûmencev Û.
Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne
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2006
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Z. 1 [II Międzynarodowa Konferencja Naukowe Aspekty Bezpilotowych Aparatów Latających]
63--70
RU
Дастся общая характеристика задач управления для перспективных БИЛЛ, в числе которых есть такие, которые не поддаются решению с помощью средств традиционных видов. Показано, что для решения этих задач требуются интеллектуальные системы управления, обладающие способностью к планированию поведения, обучению решению новых задач, адаптации к меняющимся условиям. Выделяются и анализируются четыре уровня адаптации: параметрическая адаптация (самонастройка): структурная адаптация (реконфигурация и реструктуризация): адаптация объекта (корректировка границ системы); адаптация целей управления (корректировка потребностей).
EN
There are many tasks associated with flight control for modern and advanced aircraft including unmanned aerial vehicles (UAVs), which are nor solved (or solved very unsatisfactorily) with traditional roots. It has been recognized in recent years that we are needed intelligent control systems. We can define the general characteristics of intelligent control systems as having an ability to emulate human capabilities, such as planning, learning and adaptation. Four kinds (hierarchical levels) of adaptation are distinguished and analyzed: parametrical adaptation (adjustment, self-adjustment): structural adaptation (reconfiguration and/or restructuring); object adaptation (correction of system composition); goal adaptation (adjustment of demands).
7
Content available Sterowanie silnika indukcyjnego na podstawie estymowanego sygnału prędkości kątowej
Filipek P.
Pomiary Automatyka Kontrola
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2005
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R. 51, nr 3
26-29
PL
W artykule przedstawiono porównanie dwóch koncepcji estymatorów predkości kątowej silnika indukcyjnego - układu z modelem wzorcowycm i modelem nadążnym strumienia wirnika oraz układu opartego na liniowej sieci neuronowej on-line. Szacowany przez nie sygnał prędkości wykorzystywano do śledzenia prędkości jak też w układzie automatycznej regulacji do realizacji sterowania wektorowego. Na drodze symulacji komputerowej oraz eksperymentów laboratoryjnych poddano analizie precyzję identyfikacji predkości w stanach ustalonych i dynamicznych w różnych obszarach pracy. Przedstawiono wyniki badań wrażliwości estymatorów na odstrojenie parametrów modelu silnika.
EN
The paper the comparison of two speed estimator concept: MRAS type and system based on linear neural network trained on-line. Estimated signal was not only used for speed tracking but also in automatic control system and indirect rotor field oriented control. Speed estimation performances were examined through computer simulations and laboratory tests for dynamic and states in wide operation range. The test results of estimator sensitivity to motor papameters variation are presented in the paper.
8
Content available remote Stability of a class of adaptive nonlinear systems
Dzieliński A.
International Journal of Applied Mathematics and Computer Science
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2005
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Vol. 15, no 4
455-462
EN
This paper presents a research effort focused on the problem of robust stability of the closed-loop adaptive system. It is aimed at providing a general framework for the investigation of continuous-time, state-space systems required to track a (stable) reference model. This is motivated by the model reference adaptive control (MRAC) scheme, traditionally considered in such a setting. The application of differential inequlities results to the analysis of the Lyapunov stability for a class of nonlinear systems is investigated and it is shown how the problem of model following control may be tackled using this methodology.
9
Content available remote A new adaptive least-squares estimation algorithm with generalized internal feedback
Latawiec K. J.
Archives of Control Sciences
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2004
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Vol. 14, no. 1
45-58
EN
New concepts of 'covariance matrix normalization' and the 'cascade structure' of the adaptive least-squares parameter estimator are shown to generalize and extend the use of internal information feeback in various robustness/alertness-oriented modifications to the standard ALS estimation algorithm. In the cascade estimation structure it is possible to 'naturally' stabilize, rather than maximize, the information matrix so that covariance zeroing and blowup are effectively eliminated and the celebrated square root update of the covariance matrix is no longer needed. Consequently, a new, partly heuristic ALS MIMO estimation algorithm, enabling to effectively track both slow and jump parameter variations, is presented. The algorithm is coupled with a simple but robust predictive control scheme, offering a new adaptive MIMO control strategy.
10
Adaptive sliding mode backstepping output tracking controllers for feedforward uncertain systems
Koshkouei A.J., Burnham K.J.
Systems Science
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2003
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Vol. 29, nr 1
79-96
EN
Methods for control design for nonlinear feedforward uncertain systems are considered in this paper. These systems are not usually transformable to the parametric semi-strict feedback form, and it may include unmatched uncertainties consisting of disturbances and unmodelled dynamics. The design methods are based upon (i) the backstepping approach, and (ii) a combination of sliding mode and backstepping. A comparison method of the dynamic and static backstepping methods is presented by applying two methods on a gravity-flow/pipeline system.
11
Content available Model identification and update under operation of active noise control systems
Figwer J.
Pomiary Automatyka Kontrola
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2003
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R. 49, nr 11
22--25
EN
In the paper, a new look at on-line electro-acoustic plant model identification and update for feedforward active noise control (ANC) systems under their operation is presented. The problem of on-line electro-acoustic plant model identification under active ANC system is discussed as a closed-loop identification problem with a low signal-to-noise ratio. The feedback is introduced by an adaptation algorithm. Additionally it may be also implied by an acoustic interaction between a control loudspeaker and reference microphone. In ANC literature concerning on-line electro-acoustic plant modelling it is proposed to identify electro-acoustic plant models together with the feedback. It leads to biased and inconsistent identification results. In the paper, an approach to this problem that gives results converging asymptotically to true electro-acoustic plant models is presented.
PL
W pracy zaprezentowano nowe spojrzenie na problem identyfikacji on-line modeli torów elektroakustycznych w adaptacyjnych kompensacyjnych układach aktywnego tłumienia hałasu (ATH). Problem ten dyskutowany jest jako problem identyfikacji obiektu pracującego w układzie ze sprzężeniem zwrotnym przy niskim stosunku sygnału do szumu. Sprzężenie to wprowadzane jest w układach ATH poprzez algorytm adaptacji. Może być ono również wynikiem akustycznej interakcji głośnika sterującego z mikrofonem błędu. W literaturze poświęconej aktywnemu tłumieniu hałasu proponuje się, by w trakcie pracy układów ATH identyfikować modele torów elektroakustycznych wraz ze wspomnianym sprzężeniem zwrotnym. Otrzymane w ten sposób oceny parametrów modeli torów elektroakustycznych są obciążone. W artykule zaproponowano nową metodę identyfikacji tych modeli. Metoda ta pozwala uzyskać asymptotycznie nieobciążone i zgodne oceny parametrów modeli torów elektroakustycznych.
12
Content available A New Look Adaptation in Active Noise Control Systems
Figwer J., Błażej M.
Pomiary Automatyka Kontrola
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2003
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R. 49, nr 11
18-21
EN
In the paper a new look at adaptation in active noise control (ANC) systems is presented. The adaptation is interpreted as a nonlinear feedback. This nonlinearity could be manifested in behaviour of ANC systems with occurence of complex periodic and chaoti time-domain responses. Results of real world experiments with adaptive ANC systems used to create a local zone of quiet in a laboratory enclosure showing apparently this behaviour are included.
PL
W artykule przedstawiono nowe spojrzenie na adaptację w układach tłumienia hałasu (ATH). Zwrócono uwagę na to, że adaptacja wprowadza do układu ATH nieliniowe sprzężenie zwrotne, którego konsekwencją jest pojawienie się złożonych okresowych lub chaotycznych odpowiedzi czasowych układów ATH. Zamieszczono przykłady takich odpowiedzi w wyniku doświadczeń laboratoryjnych, w których układy ATH wykorzystywano do tworzenia lokalnych przestrzennych stref ciszy w pomieszczeniu zamkniętym.
13
Content available remote A new methody of on-line model identification and update for multichannel active nose control systems
Figwer J.
Archives of Control Sciences
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2003
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Vol. 13, no. 2
141-155
EN
In the paper a new methody of on-line electro-acoustic plant model identification and update for adaptive multichannel feedforward ANC systems is presented. The proposed method uses external multivariate orthogonal multisine excitation added to the control signal. Properties of this excitation allow to decompose the overall multichannel identification problem into independent single-iput single-output identification problems. Additionally, special time-domain averaging of signals efficiently reduces an influence of disturbances on identification results even for low signal-to-noise ratio.
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