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Control Systems Magazine, IEEE

Issue 4 • Date August 1987

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Page(s): 0
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  • Editorial

    Page(s): 1
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  • Dynamic analysis and control of a roll bending process

    Page(s): 3 - 11
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    Recent research has shown that it is possible to automate the roll bending process using closed-loop control, which continuously calculates the springback of the metal workpiece. This means that one-pass forming of arbitrary two-dimensional workpiece shapes is now possible, subject to limitations of the physical apparatus and the controller. The identification of these limitations is the subject of this paper. Toward that end, dynamic models are developed for the individual components of the roll bending apparatus and for the process as a whole. These models include the unique nonlinearities of the roll bending system and also reflect the differences in the bending applications, such as bending and straightening. The process models are the basis for control analysis and design. An experimental roll bending apparatus is used to evaluate the system models and to verify the control design. The experimental results show that very good system response is possible using a simple controller. The results also illustrate the main limitation imposed on system response, which is due to vibration of the workpiece. View full abstract»

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  • 1987 CDC

    Page(s): 11
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  • Modified hybrid control for an electrohydraulic robot leg

    Page(s): 12 - 19
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    A Modified Hybrid Control scheme has been developed, which provides the mathematical structure of Hybrid Control in a manner that facilitates real-time implementation. As in Hybrid Control, either position or force (or compliance) may be controlled along each Cartesian axis. However, the control is implemented so as to achieve high servo rates. Results for control of an Adaptive Suspension Vehicle are given. This represents one of the most successful implementations of the Hybrid Control concept on an actual system, resulting in joint servoing at 140 Hz. View full abstract»

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  • Doctoral dissertations

    Page(s): 19
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  • Wideband linear quadratic control of a gyro-stabilized electro-optical sight system

    Page(s): 20 - 24
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    This paper describes the control design of the electro-optical target tracking subsystem for a mobile weapon control system. Linear quadratic control laws were applied to an existing weapon system at the hardware level to optimize plant performance in the presence of certain nonlinearities and mechanical resonance constraints. This hardware approach enabled us to develop highly accurate, fast-response weapon control systems without the degrading limitations usually associated with the plant hardware. View full abstract»

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  • Active vibration control of a simply supported beam using a spatially distributed actuator

    Page(s): 25 - 30
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    The application of a spatially shaped distributed actuator for the vibration control of a simply supported beam is studied both analytically and experimentally. The actuator consists of a layer of polyvinylidene fluoride (PVF2) bonded to one face of the beam. A summary of the underlying theory is presented, with emphasis on how controllability requirements affect the choice of the film's spatial distribution. The requisite film controller has a linearly varying spatial distribution that facilitates the control of both even- and odd-order vibrational modes. Experimental results are presented for the control of the beam's first three modes, using both the linearly varying as well as a uniform spatial distribution. The linearly varying distribution is shown to be effective in controlling both even- and odd-order modes, serving to increase the modal loss factors by up to a factor of 4.5. In addition, the experimental results are found to corroborate a simplified computer model of the controller. View full abstract»

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  • Intelligent instrumentation of solid fuel power plants

    Page(s): 31 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB)  

    Large variations in moisture content and heat value of fuels (peat, bark, coal) can cause stability problems in combustion. Some computer-based methods to improve the measurement and control of solid fuel boilers have been developed. A microprocessor-based four-beam infrared moisture measurement system has been developed, which has advantages compared with ordinary two-beam sensors. The paper also presents a digital measuring station for estimating the fuel power of the plant. Furthermore, flame monitors might give a false "flame-off" indication even if the fuel is still burning. The system developed herein estimates the changes of the combustion process by comparing the amount of flue gases generated in the process with the fuel and air feed. By adding this information to the signals obtained from the flame monitoring system, the existence of the flame can be verified. Finally, load level and combustion conditions in industrial power plants vary continuously, and when solid fuels are used, the optimal excess air in the flue gas does not stay constant. We have developed and tested a method for minimizing the losses of the boiler. View full abstract»

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  • Out of control

    Page(s): 35
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  • Solutions of the Grumman F-14 benchmark control problem

    Page(s): 36 - 40
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (445 KB)  

    In March 1985, an analysis benchmark problem was proposed for the evaluation of software for computer-aided control system design. The control system involved the longitudinal dynamics of the Grumman F-14 aircraft in level flight. Seven solutions have been received and evaluated, and the results are summarized here. In addition, some observations are presented concerning the testing of software capabilities and the preparation of benchmark problems. View full abstract»

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  • IEEE tutorial books

    Page(s): 40
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  • Modeling, simulation, and control of an oil heater

    Page(s): 41 - 44
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    This paper discusses the problems of modeling, simulation, and control of an oil heater. The decoupling control system is designed with the help of simulation and is evaluated using the inverse Nyquist array method. Much emphasis is placed on digital and analog computer simulation. The decoupling control system has been implemented with a single-board microcomputer and has worked well for over a year. View full abstract»

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  • President's message on the society and IFAC

    Page(s): 45 - 46
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  • Report from the society Dayton chapter

    Page(s): 46
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  • American automatic control council awards

    Page(s): 47 - 48
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  • 1988 ACC

    Page(s): 48
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  • News

    Page(s): 49 - 50
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  • Book reivews - Control systems

    Page(s): 51 - 52
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  • Book reviews - Adaptive signal processing

    Page(s): 51
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  • Book reviews - Artificial intelligence and man-machine systems

    Page(s): 51
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  • Book reviews - Singular perturbations and asymptotic analysis in control systems

    Page(s): 52
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  • Book reviews - An expert systems approach to computer-aided design of multivariable systems

    Page(s): 52
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  • Systematic buzzword generation

    Page(s): 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (116 KB)  

    First Page of the Article
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  • Conference calendar

    Page(s): 54
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Aims & Scope

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

Full Aims & Scope