Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207)

26-26 June 1998

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  • 1998 American Control Conference [front matter]

    Publication Year: 1998, Page(s):0_3 - 0_15
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  • Index of Authors, Speakers, Chairs and Organizers

    Publication Year: 1998, Page(s):0_16 - 0_34
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1738 KB)

    Presents an index of the authors whose papers are published in the conference. View full abstract»

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  • A new method of flatness control in cold rolling process

    Publication Year: 1998, Page(s):3828 - 3832 vol.6
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    According to practical rolling condition and the requirement of shape control, an adaptive global flatness control system is designed to realize automatic shape control of strip. The set point can be provided automatically for each actuator by a set-up model, and the adjustment of each actuator is obtained using fuzzy recognition method. The self-tuning controller with pole placement is then used ... View full abstract»

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  • A real-time expert system with GPC for cold strip mill

    Publication Year: 1998, Page(s):3824 - 3827 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    In this paper, a real-time expert system for cold strip mill is developed using a generalized predictive control (GPC) approach. A simple model of the cold strip mill for gauge and shape regulation is derived. The expert system captures such an engineer's knowledge for gauge and shape regulation and builds a knowledge base which contains both structural and behavioral knowledge. For the purpose of... View full abstract»

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  • Vibrational control of underactuated mechanical systems: control design through the averaging analysis

    Publication Year: 1998, Page(s):3482 - 3486 vol.6
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    An open loop vibrational control for underactuated mechanical systems with amplitude and frequency modulation is investigated. Since there is no direct external input to an unactuated joint, the dynamic coupling between the actuated and unactuated joint is utilized for controlling the unactuated joint. Feedback linearization has been performed to incorporate fully the known nonlinearities of the u... View full abstract»

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  • Multidimensional size control in rod bar rolling and cold strip rolling by using fuzzy method

    Publication Year: 1998, Page(s):3822 - 3823 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    We developed multivariable control systems of rod bar rolling and cold strip rolling. In these systems we used the multivariable control theory and intelligent control method, that is, fuzzy method to adjust the multidimensional size such as the section shape in bar rolling, shape (strip flatness) and edge drop (strip edge thickness distribution) in cold strip rolling. Each system consists of two ... View full abstract»

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  • Experiments in two-axis vibration damping using inertial torques through momentum wheel control

    Publication Year: 1998, Page(s):3477 - 3481 vol.6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    In robotic systems where a micro-manipulator is mounted on the end of a long link, research has demonstrated the potential of vibration damping through inertial torques initiated by micro-manipulator modulation. In such systems, controllability concerns are raised when addressing multiple degrees of freedom, varying manipulator configurations, varying payload, and multiple long links. The paper pr... View full abstract»

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  • Experimental control of a cupola furnace

    Publication Year: 1998, Page(s):3816 - 3821 vol.6
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    We present some final results from a research project focused on introducing automatic control to the operation of cupola iron furnaces. The main aim of this research is to improve the operational efficiency and performance of the cupola furnace. Experimental data are used to calibrate the model, which is taken as a first-order multivariable system with time delay. Then relative gain analysis is u... View full abstract»

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  • Optimal state estimation and parameters identification of MIMO uncertain discrete stochastic linear systems

    Publication Year: 1998, Page(s):3602 - 3606 vol.6
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    The problem of optimal simultaneous state estimation and parameters identification of MIMO stochastic discrete linear time-invariant systems is formulated. The state and parameters observability form is introduced. This new representation of MIMO linear time-invariant systems enables application of the existing optimal estimation theory for linear stochastic time-varying systems to the solution of... View full abstract»

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  • A computational issue in nonlinear H control

    Publication Year: 1998, Page(s):3744 - 3745 vol.6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (192 KB)

    Ball, Helton, and Walker (BHW, 1993) derived nonlinear H∞ controller formulas with the assumption implying that no stable mode uncontrollable from the exogenous input. In this paper, we address the numerical difficulty encountered by BHW's controller formulas when the assumption is not satisfied. Next, we propose a modified nonlinear H∞ controller and successfully... View full abstract»

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  • On the reheat furnace control problem

    Publication Year: 1998, Page(s):3811 - 3815 vol.6
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    This paper develops a model and control algorithm for the temperature control of steel blocks (slabs) passing through a furnace burner zone. The slab temperature is controlled by varying the zone temperature. A model for a single slab passing through the furnace is developed and the parameters of this model are estimated. Data from the reheat furnace no. 2 at The Danish Steel Work Ltd. are used fo... View full abstract»

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  • A reduced order time-delay control for highly simplified brushless DC motor

    Publication Year: 1998, Page(s):3791 - 3795 vol.6
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    A reduced-order time delay control (RTDC) has been derived and applied to the position control of a brushless DC motor (BLDCM) with a highly simplified hardware configuration: use of six-step commutation without current control unit. In addition, the closed-loop stability has been analyzed by using the singular perturbation method. Throughout simulation and experimental studies, RTDC has been obse... View full abstract»

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  • Parametric identification of closed-loop linear systems using cyclic-spectral analysis

    Publication Year: 1998, Page(s):3597 - 3601 vol.6
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The problem of closed-loop system identification given noisy time-domain input-output measurements is considered. It is assumed that the various disturbances affecting the system are zero-mean stationary whereas the closed-loop system operates under an external cyclostationary input which is not measured. Noisy measurements of the (direct) input and output of the plant are assumed to be available.... View full abstract»

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  • A practical algorithm for designing nonlinear H control laws

    Publication Year: 1998, Page(s):3742 - 3743 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    We describe an approximation method for the Hamilton-Jacobi-Isaacs (HJI) equation that results in feedback control. The approximation is accomplished via a two-step successive Galerkin approximation scheme. An application of the technique to the control of the forward motion of an underwater vehicle is described View full abstract»

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  • Boundary control for a general class of string models

    Publication Year: 1998, Page(s):3472 - 3476 vol.6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    We study the control of an undamped, nonlinear string model with actuator dynamics at the boundary. Specifically, we develop a boundary controller which asymptotically stabilizes the out-of-plane displacement. The performance of the controller is illustrated via dynamic simulation View full abstract»

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  • An adaptive calorimetric measurement strategy for on-line monitoring of conversion in polymerization processes

    Publication Year: 1998, Page(s):3768 - 3772 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Much research effort has been devoted to the development of sensors capable of providing reliable on-line information about the reaction advancement in polymerization processes. In particular, calorimetric techniques which have been widely investigated in the past, still present real difficulties in multipurpose industrial applications. This paper describes a new strategy for the accurate determin... View full abstract»

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  • Reconfiguration and scheduling in flight using quasi-LPV high-fidelity models and MBPC control

    Publication Year: 1998, Page(s):3649 - 3653 vol.6
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (412 KB)

    Describes advances towards reconfiguration and scheduling in flight control systems using high fidelity models expressed in a quasi-LPV form, fault detection and isolation (FDI), model approximation/simplification and constrained model based predictive control (MBPC). The strategy is applied to a well known missile example View full abstract»

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  • The Simplex architecture for safe online control system upgrades

    Publication Year: 1998, Page(s):3504 - 3508 vol.6
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    We describe the Simplex architecture, a real-time software technology which supports the safe, reliable introduction of control system upgrades while the system is running. We introduce its basic structure in control systems, discuss its fault-tolerance feature, and investigate the control issues when the technology is employed. Application of the Simplex architecture is demonstrated for a plasma-... View full abstract»

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  • Dynamic optimal reactive power flow

    Publication Year: 1998, Page(s):3410 - 3414 vol.6
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    An efficient method for minimization of energy loss over time is presented. The proposed method uses different loading conditions during a given future time interval instead of one single snapshot of the network. The method finds the optimal conditions during the given interval. The given interval is divided into several shorter periods. By increasing the number of periods or load profiles, the di... View full abstract»

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  • On the nonlinearly structured stability radius problem

    Publication Year: 1998, Page(s):3622 - 3626 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper considers the problem of finding a perturbation matrix with the least spectral norm such that a matrix-valued function becomes singular, where the dependence of the function on the perturbation is allowed to be nonlinear. It is proved that such a problem can be approximated by a smooth unconstrained minimization problem with compact sublevel sets. A computational procedure proposed base... View full abstract»

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  • Blast furnace stove control

    Publication Year: 1998, Page(s):3809 - 3810 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (188 KB)

    This paper outlines the process model and model-based control techniques implemented on the hot blast stoves for the No. 7 Blast Furnace at the Inland Steel facility in East Chicago, Indiana. A detailed heat transfer model of the stoves is developed. It is then used as part of a predictive control scheme to determine the minimum amount of fuel necessary to achieve the blast air requirements. The c... View full abstract»

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  • Speed sensorless observer for an induction machine with separate bias estimation

    Publication Year: 1998, Page(s):3788 - 3790 vol.6
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A two-stage observer, for separate state and parameter estimation, based on the state dependent Riccati equation filter methodology, is applied to the sixth-order model of an induction machine View full abstract»

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  • Modeling and parameter identification of ice-affected streamflow

    Publication Year: 1998, Page(s):3592 - 3596 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    An extended Kalman filter was developed to automate the real-time estimation of ice-affected streamflow. The filter uses routine measurements of stream stage, air temperature, and the open-water relation between stage and streamflow to compute ice-affected streamflow. The filter accommodates three dynamic modes of ice effects: sudden formation/ablation, stable-ice conditions, and eventual eliminat... View full abstract»

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  • Input-output block decoupling of linear time-varying singular systems

    Publication Year: 1998, Page(s):3737 - 3741 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    We discuss the input-output block decoupling problem by state feedback for linear time-varying singular systems. An algorithm is developed such that the system can be expressed in a simple form. A time-varying feedback law is then constructed which ensures, under appropriate conditions, that the closed-loop system is regular, free of impulses, and noninteractive. A sufficient and necessary conditi... View full abstract»

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  • Boundary control of the axially moving Kirchhoff string

    Publication Year: 1998, Page(s):3470 - 3471 vol.6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (132 KB)

    In this note, the axially moving Kirchhoff string is considered. It is proved that this nonlinear string can be stabilized by the linear boundary control, which is the negative feedback of the transversal velocity of the string at one end View full abstract»

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