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Control Systems, IEEE

Issue 5 • Date Oct. 2009

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Displaying Results 1 - 21 of 21
  • IEEE Control Systems Magazine

    Page(s): C1
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  • Table of contents

    Page(s): 2 - 4
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  • Back to square one [From the Editor]

    Page(s): 6 - 7
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  • About face [about this Issue]

    Page(s): 8 - 10
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  • So what is control engineering anyway? [President's Message]

    Page(s): 12 - 13
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  • 25 years ago

    Page(s): 14
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  • Review of membership trends [member activities]

    Page(s): 16 - 17
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  • Technical committee on networks and communications (netcoms) [technical committee activities]

    Page(s): 18 - 20, 21
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  • Flatness-based control of open-channel flow in an irrigation canal using SCADA [Applications of Control]

    Page(s): 22 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2417 KB) |  | HTML iconHTML  

    This article applied a flatness-based controller to an open channel hydraulic canal. The controller was tested by computer simulation using Saint-Venant equations as well as by real experimentation on the Gignac canal in southern France. The initial model that assumes constant lateral withdrawals is improved to take into account gravitational lateral withdrawals, which vary with the water level. Accounting for gravitational lateral withdrawals decreased the steady-state error from 6.2% (constant lateral withdrawals assumption) to 1% (gravitational lateral withdrawals assumption). The flatness-based open-loop controller is thus able to compute the upstream water discharge corresponding to a desired downstream water discharge, taking into account the gravitational withdrawals along the canal reach. View full abstract»

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  • People in Control [Interviews with George Schmidt and Wolfgang Marquardt]

    Page(s): 31 - 35
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  • Vehicle sideslip estimation

    Page(s): 36 - 52
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2399 KB) |  | HTML iconHTML  

    The objective of this article is to develop a vehicle sideslip observer that takes the nonlinearities of the system into account, both in the theoretical analysis and the design. The design goals include reduction of the computational complexity compared to the EKF, to make the observer suitable for implementation in the embedded hardware, and a reduction in the number of tuning parameters compared to the EKF. Design is based on a standard sensor configuration, and is subjected to the extensive testing in the realist conditions. View full abstract»

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  • Zero-propellant maneuver guidance

    Page(s): 53 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (11663 KB) |  | HTML iconHTML  

    This article deals with a zero-propellant maneuver guidance (ZPM) architecture to provide large-angle ISS (International Space Station) rotations. ZPM guidance commands are designed to avoid CMG (control moment gyroscope) momentum saturation. CMG desaturation is required to maintain spacecraft control capability and the manipulator's direction. The ZPM momentum-optimal trajectories were developed using computational dynamic optimization, these optimal trajectories are used to shape the command to a standard feedback controller. Using ZPM, the need for thrusters as backup to momentum-storage actuators for rotational control is minimized. View full abstract»

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  • Control of a self-bearing servomotor

    Page(s): 74 - 92
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    Self-bearing motors (SBM), also known as bearingless motors are electric motors that use magnetic levitation and rotate a shaft. In this article we deal with an SBM known as tooth-less self-bearing servomotor (TSBS), in which Lorentz force is the basis for both levitation and rotation. The article identifies the performance drawbacks of TSBS such as low bearing capacity and the conflict between bearing force and torque generation. These drawbacks are controlled by including a control scheme in the TSBS model that balances the load between two radial axes. A saturation constraint on the control input is established, that drives the rotational subsystem which preserves the stability of overall system. Several experiments are being performed to realize and validate the control design of TSBS. View full abstract»

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  • Controlling a ball and wheel system using full-state-feedback linearization [Focus on Education]

    Page(s): 93 - 101
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (879 KB) |  | HTML iconHTML  

    In this article, the ball and wheel system was considered. A mathematical model of the system was derived to facilitate the controller design. It was shown that this system is locally full-state-feedback linearizable, and a stabilizing control law was obtained based on full-state-feedback linearization. The experimental apparatus was constructed, and the controller was implemented. Simulation and experimental results were presented to demonstrate the effectiveness of the designed controller. This experimental device is easy to build, inexpensive, and well suited for nonlinear control study. View full abstract»

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  • The shapes of Nyquist plots [Lecture Notes]

    Page(s): 102 - 115
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    The Nyquist criterion is a valuable design tool with applications to control systems and circuits. In this paper, it was shown that many Nyquist plots are classical plane curves. Surprisingly, this connection seems to have gone unnoticed. It was determine that the precise shapes of several Nyquist curves and relate them to the shapes of the classical plane curves. Some classical plane curves are related to exactly proper or improper loop transfer functions, which do not roll off at high frequencies and thus are not physical. View full abstract»

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  • Book announcements

    Page(s): 116, 119 - 122
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  • Advances in discrete event, nonlinear, and stochastic systems modeling and control: A symposium in honor of Steven I. Marcus [conference reports]

    Page(s): 120 - 122
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  • Scottedward Hodel (April 6, 1962-January 9, 2009)

    Page(s): 123
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  • Minutes of the IEEE Control Systems Society Board of Governors meeting [CSS news]

    Page(s): 124 - 131
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  • Conference calendar

    Page(s): 132
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  • Random inputs

    Page(s): 136
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Aims & Scope

IEEE Control Systems Magazine is the largest circulation technical periodical worldwide devoted to all aspects of control systems.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Richard D. Braatz
braatz@mit.edu