reconfigurable control

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Reconfigurable control as actuator fault-tolerant control design for power oscillation damping

Reconfigurable control as actuator fault-tolerant control design for power oscillation damping

taking place in system. The reconfiguration component is activated on actuator fault and together with remaining active actuators from the same group(earlier to actuator fault) stabilizes system response. The group of actuators involved in wide area control and damping act as an self sufficient actuators unit for maintaining system damping and preserving system response even in the case of actua- tor faults. The reconfiguration component is dynamic and assumes parameters that changes with respect to change in actuator fault but together with remaining active actu- ators act to maintain system damping level to pre-fault condition. On actuator fault wide area control signal is redistributed to the remaining active actuators by the reconfiguration component. A two area power system model is considered for implementing the proposed meth- ods of designing (i) robust wide area damping controller and (ii) reconfiguration component to test their effective- ness in damping control. The results obtained show that reconfigurable control design for wide area damping con- troller having multiple outputs makes for an self contained actuators unit capable to maintain sufficient damping in system with or without actuator fault, under different operating points and independent of use of any redundant actuators.
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Reconfigurable Control of Two-Time Scale Systems in Presence of Additive Faults

Reconfigurable Control of Two-Time Scale Systems in Presence of Additive Faults

controllers are first proposed to handle sensor and actuator faults covering the normal operation and faulty cases. In both cases, the control scheme includes a feedback controller to handle the fault free case and an adaptive part to compensate additive faults and external disturbances. The resulting Ill- conditioned Lyapunov equation in the two cases is solved using the singular perturbation method and the simultaneous design of Lyapunov equations of the slow and fast subsystems. In the case of sensor faults, the first part of the controller, designed by an output feedback controller, is approximated by gains stabilizing the reduced order systems. While, in occurrence of actuator faults, the state-feedback controller is approximated by a composite controller which depends on the gains stabilizing the slow and fast subsystems. In both cases, the adaptive laws are simplified using ε-independent matrices. The synthesis of the reconfigurable control system guarantees the desired asymptotic stability of the full-order singularly perturbed system not only in the fault-free case, but also in occurrence of additive faults and external disturbances. The determination of the upper bound of singular perturbation parameter ε remains, as perspective, an important thematic.
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Fault Diagnosis and Reconfigurable Control of Singularly Perturbed Systems using GIMC Structure

Fault Diagnosis and Reconfigurable Control of Singularly Perturbed Systems using GIMC Structure

Dynamics of many physical systems contain the interaction of slow and fast phenomena. Such systems are called singularly perturbed systems. Singular perturbation problems involving several small parameters can be found in many areas like engineering and applied mathematics communities. This is due to the difficulty of these problems and in part to their wide applicability in power system dynamics, control of large scale systems, chemical reactors and similar settings. Small singular perturbation parameters typically represent unmodelled parasitic capacitances, time and inertia constants . . . . Controller design for such systems often suffers from high dimensionality and ill- conditioning, it is considerably simplified if a decomposition of fast and slow dynamics can be achieved [1, 2, 3, 4, 5]. Those systems, like other automated systems, are vulnerable to faults which must be detected and isolated; when a fault occurs in the system, the controller, the sensor or in the actuator, it can be amplified by the closed-loop control systems, and causes malfunction of the loop [6, 7, 8, 9, 10]. In order to overcome the limitation of conventional feedback, fault tolerant control systems are implemented in order to tolerate the presence of faults [11, 12]. There are two main classes of fault tolerant control approaches: active and passive methods. In active approaches, the principle is to use a block to detect and isolate faults in the control system. Once the diagnosis block detects and isolates a fault, the parameters and eventually the structure of the reconfigurable controller will be modified to guarantee the nominal system performance. In the passive approach, also called reliable control, a fixed controller is designed taking into account the characteristics of the fault. Usually, robust control techniques will be used without the need for system reconfiguration and fault detection [13, 14]. Several approaches have been developed to design a reliable controller, such that the resulting design guarantees closed-loop stability not only when all control components are operational, but also when faults occur [15, 16, 17, 18, 19, 20]. Veillette (1995) employed the algebraic Riccati
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A RECONFIGURABLE CONTROL MECHANISM FOR SMART TRAFFIC MANAGEMENT FOR HIGHLY CONGESTED ROUTE

A RECONFIGURABLE CONTROL MECHANISM FOR SMART TRAFFIC MANAGEMENT FOR HIGHLY CONGESTED ROUTE

Traffic lights are the signaling devices used to manage traffic on multi-way road. These are positioned to control the competing flow of the traffic at the road intersections to avoid collisions. By displaying lights (Red, Yellow and Green), they alternate the way of multi-road users. The implementation of Traffic Light Controller can be through a Microcontroller, Field Programmable Gate Array or Application Specific Integrated Circuit. FPGA implementation is advantageous over ASIC and microcontroller; number of In-Out (I/O) ports and performance compared to microcontroller and implementation with FPGA is less expensive compared to ASIC design. This paper consists of an efficient design of a reconfigurable Traffic Control System which apart from the mainstream traffic controllers, is designed in VLSI using Finite State Machines for programming in FPGA and also it can be reconfigured from a remote place according to the need for emergencies such as ambulances and also can provide a proper adaptable logic for changing signals according to the density of vehicles on the road. The coding of the traffic controller model is done in Verilog HDL and the code and the simulation results are also provided in the paper. The design is simulated and tested on Xilinx Vivado 2013.4 using Model Sim and the configurable logic is also designed and simulated on LabVIEW software of NI to provide a scenario of what is actually happening in the logic and how from one place a whole traffic system can be monitored and controlled without using heinous control systems but simply using a single system such as a computer machine. This system can be implemented in hardware using Spartan-3E FPGA. The system interfacing of lights is simulated on LabVIEW with logic for stopwatch also inserted in it which can be traffic user friendly.
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Information support of reconfigurable flight control system of the aircraft

Information support of reconfigurable flight control system of the aircraft

The increase of flights intensity of aircrafts, the density of their distribution over the echelons and stiffness requirements for compliance with flights schedule significantly affect on the safety level. There is a risk of aircraft’s collision during flight with biological, mechanical and electrical units, which can lead to the destruction of the aircraft’s structural elements or damage of its exterior contour, which can give rise to special situations in flight. Comparative analysis of the ICAO statistics showed that more than 35% of accidents caused by the aircraft’s exterior contour damage and failure of flight modes and navigation complex and reduction of power characteristics of aircraft engines. According to the Federal Aviation Administration (FAA) in the civil aviation takes up to five high risk accidents annually, which account for a significant part of the aircraft’s collision with biological, mechanical or electrical units and due to reduce quality of lubricants. We should also mention an extremely high rate of development of the situation in the air, which requires instant intervention in the situation to take the necessary control actions to prevent it from escalating into a catastrophic one, or at least stabilizing the speed of its development. This task can handle only high-speed reconfigurable control system, the information system of which is the basis that can instantly determine the moment of time, place and the degree of damage. as well as performance reduction of aircraft engine.
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Reconfigurable kinematics, dynamics and control process for industrial robots.

Reconfigurable kinematics, dynamics and control process for industrial robots.

From the industrial experience in the Flow Software Technologies, and literature review, most of the simulation and off-lining programming software packages are designed to provide only robot kinematic. The inverse kinematic solution is done separately for a single group of robots. These software systems usually have library of some robots, and if the user needs a new robot they have the option to buy it or to model it from scratch. This process is often complex and tedious. These simulation and off-lining programming software systems cannot be used to perform any reconfigurable control process. These problems are solved in this research providing a comprehensive basis for new reconfigurable control system called UROCA (Unified Reconfigurable Open Control Architecture). Using the similarities between different robotic systems, a unified generic PUMA -Fanuc kinematic model has been developed. The generalized approach for systematic modeling and solving (UKMS) was used for modeling robots from the GPF group of robots and solving their direct and inverse kinematics.
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Microfluidic Syringe Pump Using Arduino

Microfluidic Syringe Pump Using Arduino

This paper demonstrates programmable syringe pump and control by stepper motor. Stepper motor shaft rotate step by step. It control by continuous pulse from microcontroller.It regulate pressure to controlled flow. So we can have customize platform. Easily change program and add sensor depend upon our needs and No limitations. It has low cost compared commercial syringe pump. In this application used to biomedical application such as infusion pump inject to human vein, it precisely delivered medicine and liquid food etc.

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Excellent Techniques of Manufacturing Systems: RMS and FMS

Excellent Techniques of Manufacturing Systems: RMS and FMS

Systems design helps to know some general design rules, which increases flexibility and reconfigurablity. There exist a number of factors to be decided on when designing a flexible and reconfigurable production system. Review from literature some of the factors are discussed below which affect the flexible and reconfigurable system design (Davis, et al .1994).

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Detecting and Tolerating Faults in Switched Reluctance Motors

Detecting and Tolerating Faults in Switched Reluctance Motors

Its operation is based on the variable reluctance principle [3]. The torque is produced by the tendency of the rotor to reach a position where the inductance and the flux produced by the energized winding are maximized. The control system requires rotor position information for an optimal phase excitation sequence [4, 5]. Due to their very simple construction the SRMs are robust and reliable, therefore they

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Reconfigurable flight control system

Reconfigurable flight control system

Many methods have been proposed to solve the problem of preserving controllability and stability aircraft when unexpected situation appears during flight. As shown in Fig. 1 [2] they have fallen into two main categories: active [3,4,5] and passive [6,7]. In the passive category, the faulted control system continues to operate with the same controller; the effectiveness of the scheme depends upon the original control law’s possessing a considerable degree of robustness. The passive methods are essentially robust control techniques which are suitable for certain types of structural failures. These failures can be modeled as uncertainty regions around a nominal model of system. There are many types of common failures, which cannot be adequately modeled as uncertainty. Therefore, it is important to constitute the controller, which more directly addresses the concrete situation. The active category involves either an on-line re-design of the control law after failure has occurred and has been detected, or the selection of a new pre-computed control law. In this study an active fault-tolerant control system against different degree of actuator failures is considered [8].
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Dynamically Reconfigurable Intrusion Detection System

Dynamically Reconfigurable Intrusion Detection System

An implementation of an Intrusion Detection System on a Dynamically Reconfigurable Architecture is presented in this Thesis. The section on Reconfigurable Computing contains a brief literature review on the topic in areas relevant to this thesis. In the Intrusion Detection section, a background on Intrusion Detection Systems is provided, elucidating its importance in a networking environment. In Chapter 4 the architecture itself is presented with a high level overview of the various Functional Units and their interfaces. Chapter 5 discusses the implementation of a Network Based Intrusion Detection System on the Dynamically Reconfigurable Architecture along with a Performance Analysis. Suggestions for future improvements and the challenges involved in implementing these are noted in the Future Work section. The Appendix contain the Verilog code that models the architecture and the implementation of Intrusion Detection on it.
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Design of Novel Reconfigurable Frequency Selective Surfaces with Two Control Techniques

Design of Novel Reconfigurable Frequency Selective Surfaces with Two Control Techniques

is to control a diode state for a wide frequency tuning range and the second is to control a mechanical movement to change the skew angle of the FSS grid for a fine frequency tuning resolution. The designs were simulated using FDTD/PBC algorithm, while taking into account the actual model of the diode and different skew angles. The simulations were efficient in both memory usage and computational time. The results showed that these new designs provide a wide dynamic range of frequency reconfigurability and a large degree of freedom in controlling the FSS frequency response.

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Reconfigurable Beamforming Network By Using Passive Phase Shifter

Reconfigurable Beamforming Network By Using Passive Phase Shifter

This research presented the design of reconfigurable beamforming using phase shifter at input port which operated at Industrial, Scientific and Medical (ISM) frequency (2.4 GHz). Recently, the growing technology of communication systems is rapidly increasing the use of mobile and computer. This will be increasing the demand of data and capacity system. The smart antenna used to rejecting the interference signal, improve the signal to noise ratio (SNR) and increasing the channel capacity of the system. The beam forming network (BFN) is a network that controls the phases and amplitudes of the excitation current for smart antennas. The switched beam system produces the fixed multiple narrow beams and select from them the suitable beam that gives the strongest signal level. The problem is to ensure the mobile in the dynamic range, the system will shift beam one by one until meet the mobile. In this project, phase shifter used to reconfigurable phase of Beamforming network. Result simulation is obtained by using computer simulation technology (CST) in term of S-parameter in magnitude and phase and phase differences between ports. The 4×4 Butler Matrix, was fabricated on Flame Retardant Board type 4 (FR4 board). The beam position was calculated by using result progressive phase shift. Lastly, the simulation and measurement result was compared. The new beam positions are 1R, 2R, 2L, 1L if compare to conventional beam positions are 2R, 1R, 1L, 2L. As a conclusion, the project successful obtained the new beam position of 4×4 Butler Matrix.
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Fog over Virtualized IoT: New Opportunity for Context-Aware Networked Applications and a Case Study

Fog over Virtualized IoT: New Opportunity for Context-Aware Networked Applications and a Case Study

FDC, roughly speaking, it is composed by i) an Access Control Server and Router (ACSRs or Adaptive load dispatcher); ii) a reconfigurable computing Cloud managed by the Virtual Machine Manager (VMM), called load balancer, the related switched Virtual LAN, and iii) an adaptive controller that dynamically manages all the available computing-communication resources and also performs the admission control of the input/output traffic flows out to the ACSRs and reaches the processed information to the FNs. As we know, many efforts have been made to curtail the energy consumption in data centers. Roughly speaking, FDC consolidation is a popular strategy to further reduce the energy consumption by turning OFF the underutilized VMs and grouping the VMs onto the smallest number of physical servers. The effectiveness of FDC consolidation in driving costs out of IT is shown by the popularity of this strategy. The recent consolidation technologies employed in data centers encompass server and storage virtualization, as well as deploying tools for process automation. In this case study, we use the server virtualization as a dynamic control to improve energy efficiency in FDC.
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Frequency reconfigurable antenna and polarization reconfigurable antenna for wireless communication

Frequency reconfigurable antenna and polarization reconfigurable antenna for wireless communication

The frequency reconfigurable antenna and polarization reconfigurable antenna is designed as per parameters stated in Table 1 and Table 2. These designed parameters are used to simulate and optimize the antenna design. Simulation software HFSS (High Frequency Structure Simulator) is used for simulation and optimization of antenna design. The optimization is done by selecting proper position of feed point for both the antennas.

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A Survey of Reconfigurable Architectures

A Survey of Reconfigurable Architectures

CGRAs are composed of a number of function units (FUs) organized as a mesh network. In CGA, register files holds temporary values and these values are only accessible by a subset of FUs. The FUs can execute common operations like addition, subtraction, and multiplication. When compared to FPGAs, CGRAs have the advantages of short reconfiguration times, low delay characteristics, and low power consumption. Coarse grained reconfigurable architectures try to overcome the disadvantages of FPGA-based computing solutions by providing multiple-bit wide datapaths and complex operators instead of bit-level configurability. In contrast to FPGAs, the wide datapath allows the efficient implementation of complex operators in silicon. Thus, the routing overhead generated by having to compose complex operators from bit-level processing units is avoided.
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Design Of Reconfigurable Defected Ground Structure For UWB Application

Design Of Reconfigurable Defected Ground Structure For UWB Application

The purpose of this chapter is to provide a review of past research effort relate to DGS technology, reconfigurable DGS, resonator, coplanar waveguide and the process used in this study. The chapter begins with the discussion of fundamentals of DGS. A review of other relevant research studies is also provided. The review is organized chronologically to offer sight to how past research efforts have laid the groundwork for later studies, including the present research effort. The review is detailed so that the present research effort tailored to the present body of literature as well as to justly the scope and direction of the present research effort.
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Autonomous control of a reconfigurable constellation of satellites on geostationary orbit with artificial potential fields

Autonomous control of a reconfigurable constellation of satellites on geostationary orbit with artificial potential fields

Traditionally, constellation design is driven by the minimisation of the number of satellites to meet the coverage requirements of the mission. Existing constellations, and those proposed for implementation in the near future involve multiple satellites with a fixed relative position, including Teledesic, Iridium, etc [3]. The propellent budget is defined to allow only small station-keeping maneuvers during the mission, as any other maneuvering can be expensive for these relatively large spacecraft. As such, much previous work on autonomous constellation control has centred on station-keeping and maintaining a constant relative position between satellites [3, 4, 5].
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Circularly Polarized Patch Antenna with Frequency Reconfiguration

Circularly Polarized Patch Antenna with Frequency Reconfiguration

ABSTRACT: A Novel Frequency Reconfigurable Micro strip Patch Antenna was presented. The proposed antenna consists of a rectangular patch etched with rectangular ring slot. 6 pairs of varactor diodes are introduced and are placed symmetrically to bridge the gap between rectangular patch and ring slot. This construction allows independent control of antenna resonant frequency and polarization, while maintaining good impendence matching. Exciting the antenna by single co-axial probe feed, the two orthogonal resonant modes (TM01 and TM10) of the patch antenna are simultaneously excited. By changing the capacitance values of the varactor diodes the resonant frequencies of two orthogonal modes can be simultaneously changed. By introducing a specific difference between the length and width of the rectangular ring slot, good CP performances can be obtained over a broad band frequency tuning range. The measured results indicate continuously tuneable CP operating frequencies from 2.2 to 2.5 GHZ and stable radiation patterns can be achieved.
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A New Polarization Reconfigurable Microstrip Antenna Based on Complementary Split Ring Resonator

A New Polarization Reconfigurable Microstrip Antenna Based on Complementary Split Ring Resonator

According to the design dimensions given above, the polarization reconfigurable patch antenna was fabricated as shown in Fig. 8. Two PIN diodes of SMP1345-079LF are placed across the square slot. The slot separates the ground into two parts, and each part is connected with one wire. The bias voltage is applied through the two wires, and reversed DC voltage polarities are applied to PIN 1 and PIN 2. The antenna was measured with a network analyzer 8719ES and in the anechoic chamber by using the near-field measurement system. The measured S 11 of the proposed antenna which works in different
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