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Control Systems Magazine, IEEE

Issue 6 • Date Oct. 1989

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Displaying Results 1 - 5 of 5
  • Parallel linkage steering for an automated guided vehicle

    Publication Year: 1989 , Page(s): 3 - 8
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (591 KB)  

    The computer-aided design of suitable control strategies for parallel linkage steering of an experimental automated guided vehicle is described. The microprocessor-based steering control system is modeled, and stability characteristics using proportional control are investigated by means of describing functions. Although the approximation is coarse, the analysis indicates an upper bound for gain and suggests derivative action for improved control. For better accuracy, a flexible and fast simulation program that makes possible an efficient search for optimal control laws for operation of the vehicle under the constant speed mode and slow-down mode is developed. Time-independent control laws are investigated, and solutions are found that give tolerable tracking over 90 degrees arcs of 0.5 m radius. The simulation results show that time-dependent control laws are essential for improved, nonoscillatory tracking.<> View full abstract»

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  • Generalized predictive control of a heat exchanger

    Publication Year: 1989 , Page(s): 9 - 12
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB)  

    The generalized predictive controller is an extension of self-tuning control that appears to be more robust than conventional adaptive controllers in dealing with processes having varying dead time or mismodeled dynamics. This algorithm is evaluated on an experimental heat exchanger pilot plant having dynamic characteristics and delay that change with the operating point. It is evaluated at fast sampling rates for the sake of rapid load disturbance rejection. On the basis of the experimental results, guidelines for the choice of design parameters for the algorithm are proposed.<> View full abstract»

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  • Control technology test bed for large segmented reflectors

    Publication Year: 1989 , Page(s): 13 - 20
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (951 KB)  

    A description is given of an experimental test apparatus for active control of a seven-segment primary reflector (mirror). Segmented reflectors require an active segment-alignment control system to give the reflecting surface the optical performance of a single-piece reflector. The apparatus, called the Advanced Structures/Controls Integrated Experiment, consists of a Cassegrain optical configuration with a 2-m, seven-segment, actively controlled primary mirror supported by a light, flexible truss structure. The testbed is a response to the need for experiments that can simulate the complex dynamic behavior of a large structure and address the myriad problems associated with precision control of optical surfaces. The testbed is described, details of the control and optical measurement systems are presented, and preliminary performance results are reported.<> View full abstract»

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  • Optically driven learning control for industrial manipulators

    Publication Year: 1989 , Page(s): 21 - 26
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (595 KB)  

    Dynamic interactions between the robot manipulator and its environment introduce control complications, and unmodeled dynamics and flexibilities in the manipulator itself introduce additional uncertainties. An optically based learning controller that can utilize past experience and sensory information about the current state to overcome these difficulties is presented. An inexpensive, single-function optical sensor uses a light-emitting diode and eight detectors to provide information on the distance normal to the surface of a workpiece. The method is implemented on a GE-P50 robot and can be used to track the unknown surface of the workpiece.<> View full abstract»

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  • Assessment of air-to-air missile guidance and control technology

    Publication Year: 1989 , Page(s): 27 - 34
    Cited by:  Papers (56)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1027 KB)  

    Current air-to-air missile guidance and control technology is assessed. Areas explored include target state estimation, advanced guidance laws, and bank-to-turn autopilots. The assumptions, benefits, and limitations of recent applications of nonlinear filtering, adaptive filtering, modern control, adaptive control, dual control, differential game theory, and modern control design techniques to the air-to-air missile problem are discussed.<> View full abstract»

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Aims & Scope

This Magazine ceased publication in 1990. The current retitled publication is IEEE Control Systems.

Full Aims & Scope