Temat: robust adaptive control

Skocz do pozycji: 1.

Tytuł:: Robust adaptive vibration control for a general class of structures in the presence of time-varying uncertainties and disturbances
Autorzy:: Koofigar, H. R.
Amelian, S.
Tematy:: vibration control
robust adaptive control
piezoelectric materials; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279408.pdf Link otwiera się w nowym oknie
Opis:: The problem of active vibration suppression in a wide class of smart structures is addressed. The dynamical model of a structure may be perturbed by uncertain time-varying parameters and external disturbances. A novel adaptive-based control algorithm is presented here to satisfy robustness properties with respect to model uncertainties and environmental disturbances. Reflecting practical situations, the upper bound of perturbations is not required for controller design. The analytical stability of a closed-loop system is presented based on the Lyapunov stability theorem. Furthermore, numerical analysis is also provided to show the effectiveness of the proposed method.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Algorytm odpornego sterowania adaptacyjnego - DACDM
The robust adaptive control algorithm - DACDM
Autorzy:: Giernacki, W.
Tematy:: odporne sterowanie adaptacyjne
metoda diagramu współczynnikowego
algorytm DACDM
lokowanie biegunów
robust adaptive control
coefficient diagram method
DACDM algorithm
pole placement; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/155872.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono studium przypadku nad nową, autorską metodą odpornego sterowania adaptacyjnego - DACDM. Celem proponowanego algorytmu jest wyznaczenie regulatora odpornego na niepewność parametryczną, pracującego w układzie adaptacyjnym. Novum w syntezie regulatora stanowi wykorzystanie trójstopniowej kontroli odporności układu. Przeprowadzone badania numeryczne potwierdzają skuteczność proponowanego rozwiązania.
The paper presents a case study on a new, original, robust adaptive control method - DACDM [1]. The design of a controller robust to parametric uncertainty and working in the adaptive system is an aim of proposed algorithm. The DACDM procedure combines advantages of both control techniques - robust and adaptive. A novelty in the controller synthesis is the use of three stage system robustness control (by the use of coefficient diagram [2], optional step of the robustness index optimization [3], the use of adaptation mechanisms [4]). The case study is performed for the linear model SMFNO (stable, minimum-phase, non-oscillatory) described by equation 1 in the structure of the control system of Figure 1. The proposed algorithm from Figure 2 uses table 2 [5] for the selection of controller structure and design specifications [2] specified by equations 4 and 6. The use of the equation 16 enables to introduce the averaged model to the adaptive control system and the change of parametric uncertainty vector. The case study highlights the clarity of the design procedure. The coefficient diagram analysis (Fig.3) and results of conducted numerical studies (Fig. 4, Fig. 5, Fig. 8) confirm the effectiveness of the proposed solution in relation to the selected SMFNO model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Robust fractional adaptive control based on the strictly positive realness condition
Autorzy:: Ladaci, S.
Charef, A.
Loiseau, J. J.
Tematy:: sterowanie odporne
sterowanie adaptacyjne
sprzężenie do przodu
rachunek ułamkowy
positive realness
robust control
adaptive control
fractional adaptive control
model reference adaptive control
feedforward
fractional calculus; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/907854.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a new approach to robust adaptive control, using fractional order systems as parallel feedforward in the adaptation loop. The problem is that adaptive control systems may diverge when confronted with finite sensor and actuator dynamics, or with parasitic disturbances. One of the classical robust adaptive control solutions to these problems makes use of parallel feedforward and simplified adaptive controllers based on the concept of positive realness. The proposed control scheme is based on the Almost Strictly Positive Realness (ASPR) property of the plant. We show that this condition implies also robust stability in the case of fractional order controllers. An application to Model Reference Adaptive Control (MRAC) with a fractional order adaptation rule is provided with an implementable algorithm. A simulation example of a SISO robust adaptive control system illustrates the advantages of the proposed method in the presence of disturbances and noise.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 4.

Tytuł:: Discrete-time Predictive Control with Overparameterized Delay-plant Models and an Identified Cancellation Order
Autorzy:: Kowalczuk, Z.
Suchomski, P.
Tematy:: projektowanie systemów
adaptacyjny układ sterowania
sterowanie predykcyjne
sterowanie odporne
delay plants
overparameterization
system design
predictive control
robust control synthesis
adaptive control; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/908488.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 5.

Tytuł:: Fault diagnosis in a networked control system under communication constraints: A quadrotor application
Autorzy:: Chabir, K.
Sid, M. A.
Sauter, D.
Tematy:: networked control system
transmission delay
robust residual generation
adaptive residual evaluation
system sieciowy
system sterowania
opóźnienia transmisji; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/330362.pdf Link otwiera się w nowym oknie
Opis:: This paper considers the problem of attitude sensor fault diagnosis in a quadrotor helicopter. The proposed approach is composed of two stages. The first one is the modelling of the system attitude dynamics taking into account the induced communication constraints. Then a robust fault detection and evaluation scheme is proposed using a post-filter designed under a particular design objective. This approach is compared with previous results based on the standard Kalman filter and gives better results for sensor fault diagnosis.
Dostawca treści:: Biblioteka Nauki

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