Home About us Contact
|
Home About us Contact | ||
|
|
||
Descriptor Systems (descriptor + system)
Selected AbstractsFAULT DETECTION, ISOLATION AND RECONSTRUCTION FOR DESCRIPTOR SYSTEMSASIAN JOURNAL OF CONTROL, Issue 4 2005Tae-Kyeong Yeu ABSTRACT In this paper, we consider fault detection, isolation and reconstruction problem for descriptor systems with actuator faults and sensor faults, respectively. When actuator faults exist in the system, the fault detection and isolation (FDI) problem is solved through an unknown input observer regarding remaining faults excluded a specified fault as unknown inputs. Whereas, in existing sensor faults, the fault detection is only achieved by the unknown input observer and residual signals. Since the derivative signal of sensor fault is generated in the error dynamics between the actual system and the derived observer. The main objective of this work attempts the reconstruction of the faults. The reconstruction can be achieved by sliding mode observer including feedforward injection map and compensation signal. Finally, the isolation problem of sensor faults is solved by reconstructing all of the faults. [source] Regularizability Of Linear Descriptor Systems Via Output Plus Partial State Derivative FeedbackASIAN JOURNAL OF CONTROL, Issue 3 2003Guang-Ren Duan ABSTRACT Regularizability of a linear descriptor system via output plus partial state derivative feedback is studied. Necessary and sufficient conditions are obtained, which are only dependent upon the open-loop coefficient matrices. It is also shown that under these necessary and sufficient conditions, "almost all" output plus partial state derivative feedback controllers can regularize a regularizable linear descriptor system. The proposed conditions generalize many existing results. The presented example demonstrates the proposed results. [source] Robust H, Non-Fragile Controller Design for Uncertain Descriptor Systems with Time-Varying Discrete and Distributed DelaysASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 3-4 2005Dong Yue This paper is concerned with the design problem of non-fragile H, controller for uncertain descriptor systems with time-varying discrete and distributed delays and controller gain variations. The designed controller is shown to be robust not only to parameter uncertainties, but also to errors in the controller coefficients. The obtained criterion to derive an efficient non-fragile H, control design is expressed as a set of nonconvex matrix inequalities, which can be solved by combining both linear matrix inequalities technique and come complementarity method. A numerical example is given to demonstrate effectiveness of the proposed methods. [source] Use of cDNA-AFLP for transcript profiling in narrow genetic pools; for example, cucumber (Cucumis sativus L.)PLANT BREEDING, Issue 5 2006K. M. Bae Abstract A cDNA-AFLP transcript profiling was employed to examine three representative tissues (seedling, ovary and leaf) of nine Korean cucumber (Cucumis sativus L.) F1 hybrids. Differential accumulation of transcript-derived fragments (TDFs) was detected in 92 profiles. Genetic distance-based cluster analysis partitioned these hybrids into four main groupings, consistent with their phenotypic relationships. Although several polymorphic profiles were confirmed by reverse transcriptase polymerase chain reaction (RT-PCR) analysis, many were not reproducible, indicating that a large portion of the observed polymorphisms were based on sequence variation of transcripts rather than expression of variation. Thus, it is proposed that cDNA-AFLP profiling be based on a dual descriptor system (sequence and expression). Data indicate that such a system would provide an efficient genetic marker system for identifying polymorphisms in narrow genetic pools. [source] Observer-based non-fragile control against measurement disturbances and controller perturbations for discrete systems with state delay ,ASIAN JOURNAL OF CONTROL, Issue 3 2009Xiaosheng Fang Abstract This paper investigates the observer-based non-fragile control problem for a class of discrete time delay systems with measurement disturbances and controller perturbations. A simultaneous state and disturbance estimation technique is developed by designing a state observer for a descriptor system obtained from the original system. Based on this observer, the design method of a non-fragile controller is then formulated and the controller design problem is transformed to a convex optimization problem, which can be solved by a linear matrix inequality approach. In this design, the additive and multiplicative forms of uncertainties which perturb the gains of control and observer are both considered. The resultant non-fragile observer-based controller guarantees that the closed-loop system is asymptotically stable and can tolerate measurement disturbances and a certain degree of controller parameter perturbation. A numerical example is given to illustrate the effectiveness of the proposed design method. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] Robust decentralized H, control for interconnected descriptor systems with norm-bounded uncertainties,,ASIAN JOURNAL OF CONTROL, Issue 1 2009Ning Chen Abstract This paper considers a robust decentralized H, control problem for interconnected descriptor systems. The uncertainties are assumed to be time-invariant, norm-bounded, and existing in both the system and control input matrices. Our interest is focused on dynamic output feedback. A sufficient condition for an uncertain interconnected descriptor system to be robustly stabilizable H, control with a specified disturbance attenuation level is derived in terms of a nonlinear matrix inequality (NMI). A two-stage homotopy method is employed to solve the NMI iteratively. First, a decentralized controller for the nominal descriptor system is computed by imposing block-diagonal constraints on the coefficient matrices of the controller gradually. Then, the decentralized controller is gradually modified from the nominal descriptor system (without uncertainties) to the original system with uncertainties. On each stage, groups of variables are fixed alternately at the iterations to reduce the NMI to linear matrix inequalities (LMIs). An example is given to show the usefulness of this method. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] Regularizability Of Linear Descriptor Systems Via Output Plus Partial State Derivative FeedbackASIAN JOURNAL OF CONTROL, Issue 3 2003Guang-Ren Duan ABSTRACT Regularizability of a linear descriptor system via output plus partial state derivative feedback is studied. Necessary and sufficient conditions are obtained, which are only dependent upon the open-loop coefficient matrices. It is also shown that under these necessary and sufficient conditions, "almost all" output plus partial state derivative feedback controllers can regularize a regularizable linear descriptor system. The proposed conditions generalize many existing results. The presented example demonstrates the proposed results. [source] Circuit synthesis of passive descriptor systems,a modified nodal approachINTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 1 2010Timo Reis Abstract In this work we consider the problem of multiport passive reciprocal network synthesis by descriptor systems. A numerical method is presented that leads to circuit equations in modified nodal analysis. Copyright © 2008 John Wiley & Sons, Ltd. [source] Strongly absolute stability of Lur'e descriptor systems: Popov-type criteriaINTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 7 2009Chunyu Yang Abstract In this paper, we consider the strongly absolute stability problem of Lur'e descriptor systems (LDSs). First, we define a generalized Lur'e Lyapunov function (GLLF) and show that the negative-definite property of the derivative of the GLLF guarantees strongly absolute stability of LDSs. As a result, the existing Popov-type criteria are reduced to sufficient conditions for the existence of the GLLF. Then, we propose a necessary and sufficient condition for the existence of the GLLF to guarantee the strongly absolute stability of LDSs. This criterion is shown to be less conservative than the existing ones. Finally, we discuss the computational issues and present two numerical examples to illustrate the effectiveness of the obtained results. Copyright © 2008 John Wiley & Sons, Ltd. [source] Robust decentralized H, control for interconnected descriptor systems with norm-bounded uncertainties,,ASIAN JOURNAL OF CONTROL, Issue 1 2009Ning Chen Abstract This paper considers a robust decentralized H, control problem for interconnected descriptor systems. The uncertainties are assumed to be time-invariant, norm-bounded, and existing in both the system and control input matrices. Our interest is focused on dynamic output feedback. A sufficient condition for an uncertain interconnected descriptor system to be robustly stabilizable H, control with a specified disturbance attenuation level is derived in terms of a nonlinear matrix inequality (NMI). A two-stage homotopy method is employed to solve the NMI iteratively. First, a decentralized controller for the nominal descriptor system is computed by imposing block-diagonal constraints on the coefficient matrices of the controller gradually. Then, the decentralized controller is gradually modified from the nominal descriptor system (without uncertainties) to the original system with uncertainties. On each stage, groups of variables are fixed alternately at the iterations to reduce the NMI to linear matrix inequalities (LMIs). An example is given to show the usefulness of this method. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source] FAULT DETECTION, ISOLATION AND RECONSTRUCTION FOR DESCRIPTOR SYSTEMSASIAN JOURNAL OF CONTROL, Issue 4 2005Tae-Kyeong Yeu ABSTRACT In this paper, we consider fault detection, isolation and reconstruction problem for descriptor systems with actuator faults and sensor faults, respectively. When actuator faults exist in the system, the fault detection and isolation (FDI) problem is solved through an unknown input observer regarding remaining faults excluded a specified fault as unknown inputs. Whereas, in existing sensor faults, the fault detection is only achieved by the unknown input observer and residual signals. Since the derivative signal of sensor fault is generated in the error dynamics between the actual system and the derived observer. The main objective of this work attempts the reconstruction of the faults. The reconstruction can be achieved by sliding mode observer including feedforward injection map and compensation signal. Finally, the isolation problem of sensor faults is solved by reconstructing all of the faults. [source] Robust H, Non-Fragile Controller Design for Uncertain Descriptor Systems with Time-Varying Discrete and Distributed DelaysASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 3-4 2005Dong Yue This paper is concerned with the design problem of non-fragile H, controller for uncertain descriptor systems with time-varying discrete and distributed delays and controller gain variations. The designed controller is shown to be robust not only to parameter uncertainties, but also to errors in the controller coefficients. The obtained criterion to derive an efficient non-fragile H, control design is expressed as a set of nonconvex matrix inequalities, which can be solved by combining both linear matrix inequalities technique and come complementarity method. A numerical example is given to demonstrate effectiveness of the proposed methods. [source] | ||||||||||