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Control Systems Technology, IEEE Transactions on

Issue 6 • Date Nov. 1999

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Displaying Results 1 - 13 of 13
  • Author index

    Page(s): 743 - 746
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    Freely Available from IEEE
  • Subject index

    Page(s): 746 - 754
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    Freely Available from IEEE
  • Nonlinear dynamics in distributed arrival time control of heterarchical manufacturing systems

    Page(s): 724 - 730
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    Heterarchical control architectures with fully distributed control have been developed in order to improve responsiveness and effectiveness of manufacturing shop-floor control systems. The dynamics of these highly distributed systems have been difficult to predict particularly when control is based on heuristics. In this paper a dynamical model is developed for a single machine processing an arbitrary number of parts. The structure of the system, which requires queuing of parts when they arrive at a machine, leads to nonlinearities such as dead-zone and discontinuities. A continuous arrival time controller of the integrating type is used that results in a system that can be modeled using nonlinear differential equations that can be solved using a method due to Filippov (1960, 1988). This enables prediction of trajectories of part arrival times and derivation of closed form expressions for steady-state values. The analytical model for the dynamics is validated and the dynamic response of the system is illustrated using numerical simulation View full abstract»

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  • On microprocessor-based arc voltage control for gas tungsten arc welding using gain scheduling

    Page(s): 718 - 723
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    Bjorgvinsson et al. proposed (1993) a gain-scheduling approach for regulating the arc voltage of gas tungsten arc welders. While the proposed realization appears to be inappropriate, following some straightforward modifications it is shown that a realization is obtained which achieves linear closed-loop dynamics regardless of the rate of variation of the system View full abstract»

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  • Analysis and design of the integrated controller for precise motion systems

    Page(s): 706 - 717
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    Recently, feedforward controllers like zero phase error tracking controllers (ZPETC) and cross-coupled controllers (CCC) have been developed to effectively reduce tracking error and contouring error, respectively. This paper proposes an integrated controller which combines ZPETC and CCC to achieve both tracking and contouring accuracy. Furthermore, studies indicate that ZPETC and CCC can be designed separately in the present integrated control design. In the provided experimental setup with a servo table, an optimal ZPETC and a robust CCC based on the contouring error transfer function (CETF) were designed to achieve desirable frequency responses and stability. Experimental results show that the proposed integrated controller renders significantly improved accuracy in both tracking and contouring View full abstract»

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  • Sensor selection via closed-loop control objectives

    Page(s): 692 - 705
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    The ability to stabilize a system and achieve performance objectives using active feedback control is highly dependent on the location, quality, type, and number of control actuators and sensors. One role of a control engineer is to interact with the system designer to locate, size, and determine the quality of actuators and sensors required for effective control. This paper addresses one of these issues: location of sensors based on closed-loop objectives. A systematic approach, based on H2 optimal control design techniques, is developed for sensor selection which achieves desired performance objectives and includes system constraints. This approach is applied to the selection of sensors for active vibration attenuation on the NASA Langley Mini-Mast experimental structure View full abstract»

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  • Robust control of the delayed resonator vibration absorber

    Page(s): 683 - 691
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    A recent active vibration absorption scheme, the delayed resonator (DR), is considered. This method uses a very simple delayed partial state feedback control law. This simple but unconventional control invites some challenging practical problems, among which is the highlight of this paper: automatic tuning of the absorber despite parametric uncertainties in the absorber model. A frequency domain technique to achieve this objective is presented. It is based on gradient analysis of a frequency transfer function. It is shown that the routine can be implemented in real-time due to its simplicity and recurrent nature. The theoretical findings are also experimentally verified on an oscillating beam. Excellent vibration suppression is obtained not only under excitations with fixed frequency but also for those of sweep frequency type View full abstract»

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  • Deadzone compensation in motion control systems using adaptive fuzzy logic control

    Page(s): 731 - 742
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    A deadzone compensator is designed for industrial positioning: systems using a fuzzy logic (FL) controller. The FL approach is shown to subsume other approaches that use switching or indicator functions. The classification property of FL systems makes them a natural candidate for the rejection of errors induced by the deadzone, which has regions in which it behaves differently. A tuning algorithm is given for the FL parameters, so that the deadzone compensation scheme becomes adaptive, guaranteeing small tracking errors and bounded parameter estimates. Formal nonlinear stability proofs are given to show that the tracking error is small. The adaptive FL deadzone compensator is implemented on an actual industrial CNC machine tool to show its efficacy View full abstract»

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  • Specification, design, and implementation of logic controllers based on colored Petri net models and the standard IEC 1131. II. Design and implementation

    Page(s): 666 - 674
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    This work aims at designing and implementing logic control structures that allow a combination of the advantages of classical techniques for the development of programmable logic controller code and elimination of disadvantages such as the lack of formal validation. This paper introduces a method to automatically generate code for a programmable logic controller from a validated textual description of this kind of Petri nets. A special compiler that generates code according to the standard IEC 1131 is discussed. The modeling and implementation of a logic control system for flexible assembly cell using the method describe serves as an example View full abstract»

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  • An overview of rotating stall and surge control for axial flow compressors

    Page(s): 639 - 647
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    Modeling and control for axial flow compression systems have received great attention in recent years. The objectives are to suppress rotating stall and surge, to extend the stable operating range of the compressor system, and to enlarge domains of attraction of stable equilibria using feedback control methods. The success of this research field will significantly improve compressor performance and thus future aeroengine performance. This paper surveys the research literature and summarizes the major developments in this active research field, focusing on the modeling and control perspectives to rotating stall and surge for axial flow compressors View full abstract»

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  • Specification, design, and implementation of logic controllers based on colored Petri net models and the standard IEC 1131. I. Specification and design

    Page(s): 657 - 665
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    This work aims at designing and implementing logic control structures that allow a combination of the advantages of classical techniques for the development of programmable logic controller code and elimination of disadvantages such as the lack of formal validation. This paper introduces ordered color Petri nets in combination with some extensions as a modeling tool for logic controllers. The validation of both the model and the specifications of the logic control structures is then pursued through a structural analysis of the net. A special compiler that generates code according to the standard IEC 1131 is discussed. The modeling and implementation of a logic control system of a sector of a flexible assembly cell serves as an example View full abstract»

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  • Model-based leakage detection in a pulverized coal injection vessel

    Page(s): 675 - 682
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    A method for detecting and isolating incipient leakages in the valves of a pulverized coal injection vessel for a blast furnace process is presented. Nonlinear physical gray-box models of the plant are developed. Values of the unknown parameters are estimated by identification. Observers are constructed for these models and the residuals are used in a generalized likelihood ratio test. The method is successfully tested with real leakages intentionally introduced in the plant View full abstract»

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  • Predictive path parameterization for constrained robot control

    Page(s): 648 - 656
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    For robotic systems tracking a given geometric path, the paper addresses the problem of satisfying input and state constraints. According to a prediction of the evolution of the robot from the current state, a discrete-time device called a path governor generates online a suitable time-parameterization of the path to be tracked, by solving at fixed intervals a constrained scalar look-ahead optimization problem. Higher level switching commands are also taken into account by simply associating a different optimization criterion to each mode of operation. Experimental results are reported for a three-degree-of-freedom PUMA 560 manipulator subject to absolute position error, Cartesian velocity, and motor voltage constraints View full abstract»

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