Transactions of the Institute of Systems, Control and Information Engineers
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668

Transactions of the Institute of Systems, Control and Information Engineers Vol. 2 (1989), No. 9

  • Roll Eccentricity Control Based on Recursive Estimation Technique

    pp. 287-300

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.2.287

    This paper discusses a new roll eccentricity control method which has the following features ; the roll eccentricity is modeled by a sine wave equation for each roll and the eccentricity parameters, such as amplitude and initial phase angle are estimated using the recursive estimation technique. In this method, a square root filter is used to prevent the parameters from diverging. In addition, Kalman filter and exponentially weighted least square estimation are applied to decrease the estimation error due to the variance of observation noise and the gradual variation in force offset respectively. Furthermore, the convergence of parameters is automatically checked observing the trace of error convariance matrix. This control method is aplied to the first stand of tandem cold mill as a roll eccentricity control system. The convergence of recursive computation is confirmed and both the force and thickness deviation due to roll eccentricity have been reduced to less than half.
  • A Characteristic of Pointing Behavior with a Linear Cursor Key

    pp. 301-305

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.2.301

    A linear cursor key whose cursor speed on a CRT display is proportional to the force applied on the key top is presented in this paper. Three results were obtained as follows. Firstly, the positioning time by the linear cursor key can be made shorter than the time by the standard cursor key in the difficult positioning task with smaller size of the targets and longer distance to the targets. Secondly, positioning behavior consists of the approach behavior and the settlement behavior. In the approach behavior, subjects move the cursor to the edge of the targets as fast as possible. In the settlement behavior, subjects tap the cursor key repeatedly until the cursor moves in the targets. Each keystroke is performed without feedback control, because the duration of its behavior is shorter than the reaction time of the subjects. Finally, faster cursor speed is suitable for the approach behavior. On the other hand, slower cursor speed is suitable for the settlement behavior.
  • Low Sensitive Position Control System Using Hierarchical-Learning Control

    pp. 306-312

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.2.306

    In this paper, a low sensitive position control system driven by a dc servo motor using a learning identifier is proposed. The low sensitive position control system is designed for the change of moment of inertia and the learning identifier is used to make up the inverse system of the low sensitive system. The responses of the system are investigated experimentally. Moreover, these responses are compared with the responses of a proportional position control system using the learning identifier.
    As a result, it is confirmed that the responses of the proposed system are significantly improved by the learning identifier and have low sensitivity for the large change of moment of inertia about fourteen times as large as that of the motor itself. Therefore, the proposed system has a good responsibility for the change of moment of inertia without re-learning.
  • Stability of Adaptive Servo Systems with Partial Reference Model

    pp. 313-321

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.5687/iscie.2.313

    Stability of a model reference adaptive positioning servo system which have adaptive velocity loop and nonadaptive position loop is discussed. Such structure of model reference adaptive controller has been applied to real systems and some successful results have been reported.
    Although asymptotic stability of the system with gradient type adaptation law can be proved under the ideal conditions, the system become unstable when a disturbance exists inside the position loop. In this paper, stability of the system is analyzed by singular perturbation method, supposing that the speed of the adaptation is small enough. Further, the system with two different adaptation laws proposed to improve the stability of the system is analyzed similarly.

Article Access Ranking

25 Oct. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. Composition Changes of Inclusions by Reaction with Slag and Refractory: A Review ISIJ International Vol.60(2020), No.9
  3. Mechanism of Corrosion Protection at Cut Edge of Zn-11%Al-3%Mg-0.2%Si Coated Steel Sheets ISIJ International Vol.60(2020), No.9
  4. Formation, Evolution and Removal of MgO·Al2O3 Spinel Inclusions in Steel ISIJ International Advance Publication
  5. Permeability Coefficient of Oxygen in Molten Slags and Its Mechanisms ISIJ International Vol.60(2020), No.9
  6. Preface to the Special Topics on “EMECR2017: International Conference on Energy and Material Efficiency and CO2 Reduction in the Steel Industry 2017” ISIJ International Vol.60(2020), No.10
  7. Mechanism of Improved Ductility of 1500 MPa-class Ultra-high Strength Cold-rolled Steel Sheet Produced by Rolling and Partitioning Method ISIJ International Vol.60(2020), No.9
  8. Effect of the Moisture Content of Coal Blends on Coke Structure and its Apparent Gasification Kinetics with CO2 ISIJ International Vol.60(2020), No.9
  9. Effect of Addition ZrO2 Nanoparticles on Inclusion Characteristics and Microstructure in Low Carbon Microalloyed Steel ISIJ International Vol.60(2020), No.9
  10. Effect of Wettability on Penetration and Flotation Behavior of a Particle in Refining Process Tetsu-to-Hagané Vol.106(2020), No.10

Search Phrase Ranking

25 Oct. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. ultrasonic inclusion
  5. continuous casting of copper alloys
  6. mas rolling
  7. activity coefficient
  8. precipitate
  9. stabilizer bar
  10. steel