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Control Systems Technology, IEEE Transactions on

Issue 6 • Date Nov. 2000

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Displaying Results 1 - 15 of 15
  • Author index

    Publication Year: 2000 , Page(s): 1017 - 1031
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    Freely Available from IEEE
  • First IEEE/POPOV Workshop on Internet Technologies and Services. Proceedings (Cat. No.99EX391)

    Publication Year: 2000
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB)  

    The following topics were dealt with: mobile multimedia applications guaranteed service resource allocation; Web search for general and scientific information access; Internet online databases and infocash concept; scalable open-architecture media server; ATM to IP European trials; programmable router IP services creation; Russian academic and research networks remote collaboration services; SMARTS-information support for Russian SMES in information society technologies; advanced packet switching network arrival processes characteristics estimation; ATM networks path delay reduction, multicasting performance evaluation; reliable multicast using IP/CMP protocol; multiservice networks threshold based admission control; speech processing and IP-telephony human perception statistical model; scientific library; library catalogues Internet representation; mobile IP and security; wireless Internet over LMDS; Russian Internet information search; YANDEX.RU search and research engine View full abstract»

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  • Robust control of a throttle body for drive by wire operation of automotive engines

    Publication Year: 2000 , Page(s): 993 - 1002
    Cited by:  Papers (40)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB)  

    The throttle control plays an important role in the development of drive by wire (DBW) systems. The position control of the throttle valve is quite a complex problem, due to application constraints and system characteristics. A cascaded control structure including a nonlinear trajectory generator filter is adopted, allowing each different control problem to be solved with the most suitable control algorithm and implementation technology. In this regard, the use of variable structure control techniques is the key element to reaching the solution. Extensive simulation tests are reported to show the performance of the proposed control algorithm. A prototype controller is presented. The experimental implementation of the controller for a step from 2.5° to 85.5° indicates a very smooth position trajectory with a maximum dynamic position error of 7°. Application specifications are fully satisfied both in terms of control performance and controller cost View full abstract»

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  • Pressure and flow control of a pulverized coal injection vessel

    Publication Year: 2000 , Page(s): 919 - 929
    Cited by:  Papers (6)
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    This paper deals with model-based pressure and flow control of a fine coal injection vessel for the use of the blast furnace process. A control system should be in place to maintain a constant coal mass flow from the injection vessel to the blast furnace, since irregularities in the coal mass flow cause significant variations in the hot metal quality. By means of system modeling, the structure and behavior of the coal injection vessel are analyzed. It is shown that by use of a model-based design, the control objectives can be reached and the control performance can be significantly improved compared to the proportional integral (PI) controllers. Alternative control strategies are discussed and compared with the conventional design. The linear quadratic Gaussian (LQG) design method is used to design a multi-input multi-output (MIMO) controller which is validated through experiments on the coal injection plant at SSAB Tunnplat, Lulea, Sweden View full abstract»

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  • Periodic control of helicopter rotors for attenuation of vibrations in forward flight

    Publication Year: 2000 , Page(s): 883 - 894
    Cited by:  Papers (32)
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    The paper is devoted to the design of a control system for the attenuation of vibrations in the main rotor of a helicopter in forward flight. The problem can be formulated as the one of rejecting a periodic disturbance of known frequency acting at the output of a linear time-periodic system. A solution inspired to optimal control design methods is proposed. A major preliminary issue is the estimation of the characteristics of the disturbance, for which two methods are worked out. The performance of the obtained control system is assessed by means of several simulation trials View full abstract»

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  • Harmonic series compensators in power systems: their control via sliding mode

    Publication Year: 2000 , Page(s): 939 - 947
    Cited by:  Papers (9)
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    This paper deals with harmonic current compensation in power systems using shunt passive and series active filters. It is shown how constraints of the active filters can notoriously degrade the performance of the compensating system. The use of variable structure system theory is suggested for analysis and design of series active filters. Sliding mode control strategies to improve harmonic rejection are proposed, and active filters with different switching-ripple filters are considered. These control strategies provide robustness to active filter modeling errors and external disturbances View full abstract»

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  • Model-based solution techniques for the source localization problem

    Publication Year: 2000 , Page(s): 895 - 904
    Cited by:  Papers (16)
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    The problem of locating sources in dynamical systems described by partial differential equations (PDEs) is a particular case of the more general class of inverse problems. Source localization problems are often approached using non-model-based techniques. By using a priori knowledge of system dynamics, model-based approaches to this problem can be developed, reducing the number of sensors required to solve the problem. The paper presents three such approaches: off-line numerical computation of the time response data at the sensor(s) from all possible source locations and functions of source strength, spatial and time discretization of the PDE model, and off-line solution of a dual (“forward”) PDE problem based on the adjoint system model. In each case, a particular algorithm is presented, and analysis of appropriate sensor placement and the minimal number of sensors required is given. In all three approaches, a minimal amount of online processing is required. The relative strengths and shortcomings of the three approaches are discussed and are demonstrated through application to the two-dimensional isotropic heat equation View full abstract»

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  • On adaptive speed design in optical disc servo systems

    Publication Year: 2000 , Page(s): 971 - 978
    Cited by:  Papers (6)
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    For CD-ROM or DVD-ROM servo system design, it is desired to maximize the average bit rate subject to the constraints imposed by the servo motor, control circuits, decoding electronics, and other limitation factors. The bit transfer, which is governed by the scanning of the disc and the design of the speed profile of the spindle motor, is thus of paramount importance. In this paper, the speed profile design is formulated as an optimization problem and four different speed profiles are designed to maximize the bit transfer rate while accounting for different control constraints. All the designs are verified using a CD-ROM experimental setup. The design/analysis results are closely matched with the experimental data View full abstract»

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  • Nonlinear control of an underwater vehicle/manipulator with composite dynamics

    Publication Year: 2000 , Page(s): 948 - 960
    Cited by:  Papers (18)
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    This paper deals with the problem of control design of an underwater vehicle/manipulator system composed of a free navigating platform equipped with a robot manipulator. This composite system is driven by actuators and sensors having substantially different bandwidth characteristics due to their nature. Two control laws are proposed. The first is a simplification of the computed torque control law which only requires partial compensation for the slow-subsystem. Feedback compensation is only-needed to overcome the coupling effects from the arm to the basis. The second aims at replacing this partial compensation by a robust nonlinear control that does not depend on the model parameters. The closed-loop performance of this controller is close to that of the model-based compensation. Both control laws are shown to be closed-loop stable in the sense of the perturbation theory. A comparative study between a linear PD controller, a partial model-based compensation, and the nonlinear robust feedback is presented View full abstract»

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  • Discrete-time adaptive windowing for velocity estimation

    Publication Year: 2000 , Page(s): 1003 - 1009
    Cited by:  Papers (75)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    We present methods for velocity estimation from discrete and quantized position samples using adaptive windowing. Previous methods necessitate trade-offs between noise reduction, control delay, estimate accuracy, reliability, computational load, transient preservation, and difficulties with tuning. In contrast, a first-order adaptive windowing method is shown to be optimal in the sense that it minimizes the velocity error variance while maximizes the accuracy of the estimates, requiring no tradeoff. Variants of this method are also discussed. The effectiveness of the proposed technique is verified in simulation and by experiments on the control of a haptic device View full abstract»

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  • Exact temperature tracking for hyperthermia: a model-based approach

    Publication Year: 2000 , Page(s): 979 - 992
    Cited by:  Papers (8)
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    In this paper, the inverse dynamics method for generating feedforward inputs and reference trajectories to achieve exact tracking for general linear time-invariant MIMO systems is explicitly derived. The method is applied to the task of generating input powers to achieve exact temperature tracking at multiple locations within a tumor during hyperthermia treatments. A number of important issues are considered: 1) robustness of the control schemes to parameter variation; 2) effect of additive sensor and actuator noise; 3) effect of using reduced order model estimators; and 4) effect of fast desired trajectories on the accuracy of output tracking. The inverse dynamics method is shown to be significantly more accurate when fast trajectories are desired. The results of this simulation study show that model-based inverse dynamics control is promising for clinical application. In addition, the inverse dynamics method derived can also be applied to other general linear MIMO systems View full abstract»

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  • Thermoacoustic instability: model-based optimal control designs and experimental validation

    Publication Year: 2000 , Page(s): 905 - 918
    Cited by:  Papers (22)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    Active control of thermoacoustic instability has been increasingly sought after in the past two decades to suppress pressure oscillations while maintaining other performance objectives such as low NOx emission, high efficiency, and power density. We have developed a feedback model of a premixed laminar combustor which captures several dominant features in the combustion process such as heat release dynamics, multiple acoustic modes, and actuator effects. In this paper, we study the performance of optimal control designs including LQG-LTR and H methods using the model with additional effects of mean heat and mean flow actuator dynamics, and input saturation. We also verify these designs experimentally using a 1 kW bench-top combustor rig and a 0.2-W loudspeaker over a range of flow rates and equivalence ratios. Our results show that the proposed controllers, which are designed using a two-mode finite dimensional model, suppress the thermoacoustic instability significantly faster than those obtained using empirical approaches in similar experimental setups without creating secondary resonances, and guarantee stability robustness View full abstract»

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  • A novel approach on parameter identification for inverter driven induction machines

    Publication Year: 2000 , Page(s): 873 - 882
    Cited by:  Papers (7)
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    AC machines are applied in actuator systems for many applications. The development of fast processors open up the possibilities to apply new techniques for identification and control of electrical drives in real-time, so as to improve and optimize their performances. The paper presents a systematic approach to identify the physically relevant parameters of an AC machine. Special attention is paid to the identification of these parameters, without differentiating the measured voltages and currents. This approach allows the use of high sampling rates necessary to apply identification in real time. The approach is applicable for electrical machines but can be extended to other classes of electro-mechanical actuators. The simulation studies performed in the paper highlight the improvements of the new outlined approach over existing identification methods under realistic operation conditions where the test signals are generated by the power source (inverter) in an uncomplicated way View full abstract»

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  • Active noise control of a duct using robust control theory

    Publication Year: 2000 , Page(s): 930 - 938
    Cited by:  Papers (9)
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    In this paper the control of sound propagation in an air-handling duct using a feedback active noise control (ANC) system is investigated both from a theoretical and from a practical point of view. Using identified discrete-time models of the duct, robust linear controllers are designed by means of the combined pole placement/sensitivity function shaping method. The specific features of the harmonic sources of noise and the study of the effect of model uncertainty on the ANC performance are taken into account in order to avoid the classical stochastic adaptive and the reference noise-based methods. As a consequence, our solutions are easy to implement in real-time applications. As an illustration, we give detailed results for the control of the noise in an industrial air conditioner propagating through a duct View full abstract»

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  • Turbofan engine control design using robust multivariable control technologies

    Publication Year: 2000 , Page(s): 961 - 970
    Cited by:  Papers (14)  |  Patents (1)
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    A unified robust multivariable approach to propulsion control design has been developed at NASA Glenn Research Center. The critical elements of this unified approach are: a robust H control synthesis formulation; a simplified controller scheduling scheme; and a new approach to the synthesis of integrator windup protection gains for multivariable controllers. This paper presents results from an application of these technologies to control design for linear models of an advanced turbofan engine. The objectives of the study were to transfer technology to industry and to identify areas of further development for the technology. The technology elements and industrial development of tools to implement the steps are described with respect to their application to a GE variable-cycle turbofan engine. A set of three-input/three-output three-state linear engine models was used over a range of power levels covering engine operation from idle to maximum unaugmented power. Results from simulation evaluation are discussed and insight is provided into how the design parameter choices affect the results View full abstract»

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