Control reconfiguration

About: Control reconfiguration is a research topic. Over the lifetime, 22423 publications have been published within this topic receiving 334217 citations.

Adaptive Sliding-Mode Control of Markov Jump Nonlinear Systems With Actuator Faults

Abstract: This technical note is concerned with the design problem of adaptive sliding-mode stabilization for Markov jump nonlinear systems with actuator faults. The specific information including bounds of actuator faults, bounds of the nonlinear term and the external disturbance is not available for the controller design. The main attention focuses on designing the adaptive sliding-mode controller to overcome these problems. Firstly, a sliding-mode surface is constructed such that the reduced-order equivalent sliding motion is stochastically stable. Secondly, the adaptive sliding-mode controller can drive the state trajectories of the system onto the sliding-mode surface in finite time, and can estimate the loss of effectiveness of actuator faults and bounds of the nonlinear term and the external disturbance online. Thirdly, the stochastic stability of the closed-loop system can be guaranteed. Finally, a practical example is provided to demonstrate the effectiveness of the presented results.

DPGA-coupled microprocessors: commodity ICs for the early 21st Century

Abstract: During the past decade, the microprocessor has become a key commodity component for building all kinds of computational systems. During this time frame, large reconfigurable logic arrays have exploited the same advances in IC fabrication technology to emerge as viable system building blocks. Looking at both the technology prospects and application requirements, there is compelling evidence that microprocessors with integrated reconfigurable logic arrays will be a primary building block for future computing systems. In this paper, we look at the role such components can play in building high-performance and economical systems, as well as the ripe technological outlook. We note how the tight integration of reconfigurable logic into the processor can overcome some of the major limitations of contemporary attached reconfigurable computer engines. We specifically consider the use of integrated dynamically programmable gate array (DPGA) structures for the configurable logic, and examine the advantages that rapid reconfiguration provides in this application. >

Wdm Optical Networks: Concepts, Design and Algorithms

Abstract: (NOTE: Each chapter begins with an Introduction and concludes with Problems.) Preface. 1. WDM Technology and Issues in WDM Optical Networks. Optical Networks. Wavelength Division Multiplexing. WDM Optical Networking Evolution. Enabling Technologies for WDM Optical Networks. WDM Optical Network Architectures. Issues in Wavelength Routed Networks. Next-Generation Optical Internet Networks. Book Overview. 2. Wavelength Routing Algorithms. Classification of RWA Algorithms. RWA Algorithms. Fairness and Admission Control. Distributed Control Protocols. Permutation Routing and Wavelength Requirements. Summary. 3. Wavelength-Convertible Networks. Need for Wavelength Converters. Wavelength-Convertible Switch Architectures. Routing in Convertible Networks. Performance Evaluation of Convertible Networks. Networks with Sparse Wavelength Conversion. Converter Placement Problem. Converter Allocation Problem. Summary. 4. Wavelength Rerouting Algorithms. Benefits of Wavelength Rerouting. Issues in Wavelength Rerouting. Lightpath Migration. Rerouting Schemes. Algorithm AG. Algorithm MWPG. Rerouting in WDM Networks with Sparse Wavelength Conversion. Rerouting in Multifiber Networks. Rerouting in Multifiber Unidirectional Ring Networks. Summary. 5. Virtual Topology Design. Virtual Topology Design Problem. Virtual Topology Design Subproblems. Virtual Topology Problem Formulation. Virtual Topology Design Heuristics. Regular Virtual Topology Design. Predetermined Virtual Topology and Lightpath Routes. Predetermined Virtual Topology. Design of Multifiber Networks. Summary. 6. Virtual Topology Reconfiguration. Need for Virtual Topology Reconfiguration. Reconfiguration Due to Traffic Changes. Reconfiguration for Fault Restoration. Summary. 7. Network Survivability and Provisioning. Failures and Recovery. Restoration Schemes. Multiplexing Techniques. Provisioning Restorable Multifiber Networks. Provisioning Restorable Single-Fiber Networks. Backup Multiplexing-Based Routing. Primary-Backup Multiplexing-Based Routing. Distributed Control Protocols. Survivability in WDM Ring Networks. Summary. 8. Optical Multicast Routing. Multicast Routing Problem. Node Architectures. Multicast Tree Generation. Source-Based Tree Generation. Steiner-Based Tree Generation. Virtual Source-Based Trees. Summary. 9. Next-Generation Optical Internet Networks. Optical Circuit Switching. Optical Burst Switching. Optical Packet Switching. MPLS in WDM Networks. Summary. References. Appendices. AWEB RESOURCES LIST. BATM Technology. CSONET Technology. DMPLS Framework. Acronyms. Index.

Stability of the pseudo-inverse method for reconfigurable control systems

Abstract: One of the key reconfigurable control methods, the pseudo-inverse method (PIM), is analysed and new insight is obtained which provides the theoretical basis for this practical approach. The main shortcoming of this method, the lack of stability guarantees, is pointed out and a new approach is proposed in which recent results on the stability robustness of linear systems are used to provide stability constraints for the solutions of the PIM. When the original PIM solution results in an unstable closed-loop system, the control redesign problem is treated as a constraint minimization problem. For single-input systems, a closed-form solution is presented; for multi-input systems, a near-optimal solution is found which maintains the stability of the closed-loop system.

Reconfigurable Antennas: Design and Applications

Abstract: The advancement in wireless communications requires the integration of multiple radios into a single platform to maximize connectivity. In this paper, the design process of reconfigurable antennas is discussed. Reconfigurable antennas are proposed to cover different wireless services that operate over a wide frequency range. They show significant promise in addressing new system requirements. They exhibit the ability to modify their geometries and behavior to adapt to changes in surrounding conditions. Reconfigurable antennas can deliver the same throughput as a multiantenna system. They use dynamically variable and adaptable single-antenna geometry without increasing the real estate required to accommodate multiple antennas. The optimization of reconfigurable antenna design and operation by removing unnecessary redundant switches to alleviate biasing issues and improve the system's performance is discussed. Controlling the antenna reconfiguration by software, using Field Programmable Gate Arrays (FPGAs) or microcontrollers is introduced herein. The use of Neural Networks and its integration with graph models on programmable platforms and its effect on the operation of reconfigurable antennas is presented. Finally, the applications of reconfigurable antennas for cognitive radio, Multiple Input Multiple Output (MIMO) channels, and space applications are highlighted.