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Wyświetlanie 1-15 z 16
Tytuł:
Verification techniques for sensitivity analysis and design of controllers for nonlinear dynamic systems with uncertainties
Autorzy:
Rauh, A.
Minisini, J.
Hofer, E. P.
Powiązania:
https://bibliotekanauki.pl/articles/930112.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
arytmetyka przedziałowa
analiza osiągalności
sterowanie odporne
interval arithmetic
reachability analysis
observability analysis
robust stability
model-based design of optimal controllers
Opis:
Control strategies for nonlinear dynamical systems often make use of special system properties, which are, for example, differential flatness or exact input-output as well as input-to-state linearizability. However, approaches using these properties are unavoidably limited to specific classes of mathematical models. To generalize design procedures and to account for parameter uncertainties as well as modeling errors, an interval arithmetic approach for verified simulation of continuoustime dynamical system models is extended. These extensions are the synthesis, sensitivity analysis, and optimization of open-loop and closed-loop controllers. In addition to the calculation of guaranteed enclosures of the sets of all reachable states, interval arithmetic routines have been developed which verify the controllability and observability of the states of uncertain dynamic systems. Furthermore, they assure asymptotic stability of controlled systems for all possible operating conditions. Based on these results, techniques for trajectory planning can be developed which determine reference signals for linear and nonlinear controllers. For that purpose, limitations of the control variables are taken into account as further constraints. Due to the use of interval techniques, issues of the functionality, robustness, and safety of dynamic systems can be treated in a unified design approach. The presented algorithms are demonstrated for a nonlinear uncertain model of biological wastewater treatment plants.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 3; 425-439
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Way of ETO SMEs to Mass Customization – Overview from Real Production Systems
Autorzy:
Ciesla, Bartosz
Mleczko, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2023980.pdf
Data publikacji:
2021-09
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
production planning
production control
mass customization
robust process design
Opis:
In this article conclusions from nearly 10 years of collaboration with Polish and German Engineer-to-Order (ETO) small and medium-sized enterprises (SMEs) from mechanical sector was presented. Research objective was to highlight common organizational problems they are dealing with, which prevent them from transition to Mass Customizers. As a result, a concept of 5 foundations for robust process design was proposed: procedures, product selection, machining philosophy, planning and storage, cross-functional teams. More practical solutions from this field have to be published to fill the research gap.
Źródło:
Management and Production Engineering Review; 2021, 13, 3; 97-105
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Response Surface Methodology revisited – comparison of analytical and non-parametric approaches
Autorzy:
Osocha, P.
Powiązania:
https://bibliotekanauki.pl/articles/112084.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
expert system
design of experiment
factorials
Taguchi robust design
RSM
system ekspercki
projektowanie eksperymentu
metodologia powierzchni odpowiedzi
metoda Taguchi
Opis:
Since G.E.P. Box introduced central composite designs in early fifties of 20th century, the classic design of experiments (DoE) utilizes response surface models (RSM), however usually limited to the simple form of low-degree polynomials. In the case of small size datasets, the conformity with the normal distribution has very weak reliability and it leads to very uncertain assessment of a parameter statistical significance. The bootstrap approach appears to be better solution than – theoretically proved but only asymptotically equal – t distribution based evaluation. The authors presents the comparison of the RSM model evaluated by a classic method and bootstrap approach.
Źródło:
Production Engineering Archives; 2018, 20; 49-53
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The outline of the expert system for the design of experiment
Autorzy:
Dwornicka, R.
Pietraszek, J.
Powiązania:
https://bibliotekanauki.pl/articles/111864.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
expert system
design of experiment
factorials
Taguchi robust design
RSM
system ekspercki
projektowanie eksperymentu
metoda Taguchi
metodologia powierzchni odpowiedzi
Opis:
The design of experiment (DoE) is a methodology originated from early 1920s when Fisher’s papers created the analysis of variance and first known experimental designs: latin squares. It is focused on a construction of empirical models based on measurements obtained from specifically structured and driven experiments. Its development resulted in the constitution of four distinctive branches recognized by the industry: factorials (full or fractional), Taguchi’s robust design, Shainin’s Red-X® and a response surface methodology (RSM). On one hand, the well-known success stories of this methodology implementations promise great benefits, while on other hand, the mathematical complexity of mathematical and statistical assumptions very often lead to improper use and wrong inferences. The possible solution to avoid such mistakes is the expert system supporting the design of experiments and subsequently the analysis of obtained data. The authors propose the outline of such system and provides the general analysis of the ontology and related inference rules.
Źródło:
Production Engineering Archives; 2018, 20; 43-48
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust parameter design using the weighted metric method - The case of 'the smaller the better'
Autorzy:
Ardakani, M. K.
Noorossana, R.
Niaki, S. T. A.
Lahijanian, H.
Powiązania:
https://bibliotekanauki.pl/articles/907855.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wnioskowanie decyzyjne
estymacja regresji
metodologia oceny powierzchni
metoda metryczna
multiobjective decision making
regression estimation
response surface methodology
robust parameter design
weighted metric method
Opis:
In process robustness studies, it is desirable to minimize the influence of noise factors on the system and simultaneously determine the levels of controllable factors optimizing the overall response or outcome. In the cases when a random effects model is applicable and a fixed effects model is assumed instead, an increase in the variance of the coefficient vector should be expected. In this paper, the impacts of this assumption on the results of the experiment in the context of robust parameter design are investigated. Furthermore, two criteria are considered to determine the optimum settings for the control factors. In order to better understand the proposed method and to evaluate its performances, a numerical example for the case of 'the smaller the better' is included.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 1; 59-68
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust Optimization Model for Truss Topology Design Problem Using Convex Programming CVX
Autorzy:
Shafira, Tri
Chaerani, Diah
Lesmana, Eman
Powiązania:
https://bibliotekanauki.pl/articles/1031207.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CVX
Robust optimization
Truss Topology Design
load
semidefinite programming
uncertainty
Opis:
Topology optimization is one of the optimization applications in the field of infrastructure or truss structure design. Aiming to find the optimal connectivity bar by determining the best node leads to minimizing compliance. Robust optimization is used to conquer the uncertainty of external load parameters that are continuous and convex. The Robust Topology Optimization model uses semidefinite programming with an ellipsoidal uncertainty set. To solve the model, we use a modeling system called CVX, CVX uses the object-oriented features of MATLAB to turn it into an optimization modelling language: optimization variables can be declared and constraints and objectives specified using natural MATLAB syntax. The results of numerical simulations using CVX in the Robust Truss Topology Design (RTTD) model obtained an optimal robust solution, where the truss is resistant to load uncertainty for single-load or multi-load.
Źródło:
World Scientific News; 2020, 148; 27-45
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust control of the micro UAV dynamics with an autopilot
Autorzy:
Mystkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/280869.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
robust optimal control
mu-synthesis
uncertainty design
micro aerial vehicle
autopilot
Opis:
This paper presents a nonlinear robust control design procedure for a micro air vehicle, which uses the singular value (μ) and μ-synthesis technique. The optimal robust control law that combines parametric and lumped uncertainties of the micro UAV (unmanned aerial vehicle) which are realized by serial connection of the Kestrel autopilot and the Gumstix microprocessor. Thus, the robust control feedback loops, which handle the uncertainty of aerodynamics derivatives, are used to ensure the robust stability of the UAV local Dynamics in longitudinal and lateral control directions.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 751-761
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust control of depth of anesthesia based on H∞ design
Autorzy:
Caiado, D. V.
Lemos, J. M.
Costa, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/229439.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
depth of anesthesia
model uncertainty
robust control feedback
H∞ design
μ-synthesis
Opis:
This paper presents a case study on the design of a robust controller for the depth of anesthesia (DoA) induced by the drug propofol. This process is represented by a linear model together with a non-parametric uncertainty description that is evaluated using a patient model bank with 20 patients undergoing sedation. By using H∞ methods, the controller is aimed to comply with robust stability and performance specifications for the class of patient models considered. A minimization problem of sensitivity and complementary sensitivity is made to design the controller. The controller that results from this procedure is approximated by a controller with a lower order, that in turn is redesigned in discrete time for computer control application. The resulting controller is evaluated in simulations using a realistic nonlinear model of DoA.
Źródło:
Archives of Control Sciences; 2013, 23, 1; 41-59
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projektowanie odpornego regulatora PID, oparte o przyblizoną identyfikację modelu dla procesów z opóźnieniem
Design of PID controllers based on approximate process model identification for processes with time delay.
Autorzy:
Skoczowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/158325.pdf
Data publikacji:
2004
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
regulacja odporna PID
uproszczona identyfikacja i modelowanie
robust PID control
controller design
PID tuning
Opis:
Przedstawiono dwa sposoby projektowania regulatora PID dla procesów aperiodycznych z opóźnieniem, istotnie różne - regulatora odpornego, gwarantującego w oparciu o kryterium Nyquista stabilność w obecności ograniczonych perturbacji nieznanego obiektu, przy znanym modelu nominalnym, oraz regulatora gwarantującego założone przeregulowanie, przy aproksymacji obiektu zastepczymi transmitancjami inercji I i II rzędu z opóźnieniem. Przedstawiono też przybliżony sposób identyfikacji tych aproksymacji. Metody mogą być także wykorzystane w regulatorach samonastrajających PID.
Two approximate methods for design of PID controllers for aperiodic processes with time delay are presented. The first method is based on the Nyquist stability criterion, and yields a robust controller that ensures system stability in the presence of constrained perturbations experienced by the unknown process with the known nominal model. The second method yields a controller that ensures a specified overshoot while the controlled process is approximated by first and second order time lags with time delay. An approximate method for identification of these models is also presented. The methods considered are also suitable for being used for self-tuning of PID controllers.
Źródło:
Pomiary Automatyka Kontrola; 2004, R. 50, nr 7-8, 7-8; 24-27
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ply thickness tolerances in stacking sequence optimization of multilayered laminate plates
Autorzy:
Latalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/279654.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
laminate composite structures
optimization
manufacturing tolerances
robust design
structural stability
Opis:
The paper deals with the impact of manufacturing tolerances of plies thicknesses on optimal design of multi-layered laminated plates in compression. It is assumed that the considered tolerances are represented by the maximum acceptable deviation of every individual ply thickness from its nominal design value. The robustness of the optimum is achieved diminishing the buckling load amplitude factor by the product of arbitrary assumed tolerances and appropriate sensitivities. The discussed optimization problem is solved numerically by the direct enumeration method. The proposed approach is illustrated with examples of the rectangular multi-layered laminated plate design under uni- and biaxial compression. The achieved results emphasise the robustness of the proposed method compared to the approaches with ignored tolerances.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 1039-1052
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the ship course-keeping control system design by using robust feedback linearization
Autorzy:
Zwierzewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/260552.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
feedback linearization
robust control
differential games
ship autopilot design
Opis:
In the paper the problem of ship autopilot design based on feedback linearization method combined with the robust control approach, is considered. At first the nonlinear ship model (of Norrbin type) is linearized with the use of the simple system nonlinearity cancellation. Next, bearing in mind that exact values of the model parameters are not known, the ensuing inaccuracies are taken as disturbances acting on the system. Thereby is obtained a linear system with an extra term representing the uncertainty which can be treated by using robust, H∞optimal control techniques. The performed simulations of ship course-changing process confirmed a high performance of the proposed controller despite the assumed significant errors of its parameters.
Źródło:
Polish Maritime Research; 2013, 1; 70-76
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On optimality of the orthogonal block design
Autorzy:
Synówka-Bejenka, Ewa
Zontek, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/729896.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Experimental design
orthogonal block design
robust estimator
maximum likelihood estimator
A-optimality
D-optimality
Opis:
In the paper a usual block design with treatment effects fixed and block effects random is considered. To compare experimental design the asymptotic covariance matrix of a robust estimator proposed by Bednarski and Zontek (1996) for simultaneous estimation of shift and scale parameters is used. Asymptotically A- and D- optimal block designs in the class of designs with bounded block sizes are characterized.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2012, 32, 1-2; 59-68
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kriging based robust optimisation algorithm for minimax problems in electromagnetics
Autorzy:
Li, Y.
Rotaru, M.
Sykulski, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/141299.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
worst-case optimisation
minimax problems
kriging
robust design
Opis:
The paper discusses some of the recent advances in kriging based worst-case design optimisation and proposes a new two-stage approach to solve practical problems. The efficiency of the infill points allocation is improved significantly by adding an extra layer of optimisation enhanced by a validation process.
Źródło:
Archives of Electrical Engineering; 2016, 65, 4; 843-854
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kernel Ho-Kashyap classifier with generalization control
Autorzy:
Łęski, J.
Powiązania:
https://bibliotekanauki.pl/articles/907269.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda jądrowa
metoda odporna
projekt klasyfikatora
kernel methods
classifier design
Ho-Kashyap classifier
generalization control
robust methods
Opis:
This paper introduces a new classifier design method based on a kernel extension of the classical Ho-Kashyap procedure. The proposed method uses an approximation of the absolute error rather than the squared error to design a classifier, which leads to robustness against outliers and a better approximation of the misclassification error. Additionally, easy control of the generalization ability is obtained using the structural risk minimization induction principle from statistical learning theory. Finally, examples are given to demonstrate the validity of the introduced method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 53-61
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discrete-time Predictive Control with Overparameterized Delay-plant Models and an Identified Cancellation Order
Autorzy:
Kowalczuk, Z.
Suchomski, P.
Powiązania:
https://bibliotekanauki.pl/articles/908488.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
projektowanie systemów
adaptacyjny układ sterowania
sterowanie predykcyjne
sterowanie odporne
delay plants
overparameterization
system design
predictive control
robust control synthesis
adaptive control
Opis:
The paper presents several solutions to the discrete-time generalized predictive (GPC) controller problem, including an anticipative filtration mechanism, which are suitable for plants with nonzero transportation delays. Necessary modifications of the GPC design procedure required for controlling plants based on their non-minimal models are discussed in detail. Although inevitably invoking the troublesome pole-zero cancellation problem, such models can be used in adaptive systems as a remedy for the uncertainty or variability of the model order. The purpose of this paper is to present a complete GPC controller design for delay plants that is robust to the overparameterization of the plant model. Refined conditions for the existence and stability of GPC control solutions in terms of pertinent design parameters are given, and explicit forms of closed-loop characteristic polynomials are provided. The issue of identifying the model cancellation order is also considered, and practical solutions are proposed. The presented ideas are illustrated numerically.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 1; 5-34
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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