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. 5 (1992), No. 3

  • Stability of Control Systems with Local Adaptive Feedback Loops

    pp. 85-93

    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.5.85

    This paper discusses stability of a class of adaptive control systems. The system considered consists of an adaptive block and non-adaptive blocks. The adaptive block is constructed by the conventional model reference adaptive control (MRAC) approach. Assuming the general properties of MRAC, sufficient conditions for the whole system to be stable are obtained.
  • Application of Analytic Hierarchy Process to Extract the User's Purpose of Expert Systems

    pp. 94-101

    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.5.94

    This paper deals with an application of analytic hierarchy process (AHP) to extract the user's purpose which must be input to expert systems. In the AHP, the process to obtain the weights for criteria by pairwise comparisons is interpreted as the extraction of the decision marker's idea about the importance of each criterion. With this interpretation, the analytic hierarchy process is applied to extract the analyst's idea of the weights of several factors to select constitutive equations suitable for a target analysis in a model selection support expert system under development for numerical simulation of nuclear thermal-hydraulics; the constitutive equations are ordinary introduced in a liquid-vapor two-phase flow analysis. Furthermore, an algorithm by applying the graph theory is shown to evaluate covering condition to obtain the weights from incomplete pairwise comparisons.
  • Temperature Control for Heating Cylinder by Multivariable STC

    pp. 102-110

    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.5.102

    The rapid progress of micro-processing techniques enables us to use intelligent control algorithms of high level for complex systems by using micro-computers. The heating cylinder for plastic molding is one of those complex systems which is required to control the temperature as precise as possible.
    In this paper an adaptive temperature control method is proposed to improve performance of the temperature control system for the heating cylinder. This method is based on the multivariable self-tuning control (STC) theory. The temperature control system contains three heaters and three sensors. The unknown parameters in the equation are identified by the least squares estimation method. We obtain a minimum-phase model for the heating cylinder by tuning the value of the time delay contained in the identified model. The adaptive controller has been constructed for the identified system by STC theory. Some experimental results are illustrated to show that the STC method is effective in comparison with a conventional method by PID Controller and Ziegler-Nichols method.
  • A Design of Digital Tracking Controller in the Presence of Load Change

    pp. 111-121

    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.5.111

    This paper deals with a digital tracking control system subject to change in load condition. It is assumed that the plant is described by a discrete-time state-space model with a time delay and a direct forward link between control input and output. An optimal controller with state feedback plus integral and preview actions is derived by using the LQI technique. It is shown under the stabilizability and detectability conditions that the optimal closed-loop system is stable and achieves a complete output regulation. For a special case where the time delay is unilateral, we present an algorithm for computing feedback gain with less computational effort. The tracking performance of proposed optimal control law is evaluated through a numerical example for a heat exchanger model. Experimental studies using a pilot plant show that the controller gives acceptable tracking performance in the presence of load change.
  • A Design of Adaptive Identifier with Periodical Input

    pp. 122-130

    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.5.122

    In this paper, we consider the problem of continuous adaptive identification where a periodical 'test input signal can be used. First, we propose a design method of the gain matrix of the adjust rule for the Kreisselmeier's type adaptive identifier. With it, all of the parameters converge approximately, with similar exponential rate. Second, a new parameter adjust rule is presented for the Lüder-Narendra's type adaptive identifier. Using this rule, the parameters converge approximately with the same exponential rate as. Kreisselmeier's type adaptive identifier. Finally, the design of the input signal, the state filters and the gain matrix of adjust rule, etc. are discussed, and computer simulations are presented.

Article Access Ranking

19 Nov. (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. Effect of Interfacial Properties on Agglomeration of Inclusions in Molten Steels ISIJ International Vol.59(2019), No.10
  3. Agglomeration and Removal of Alumina Inclusions in Molten Steel with Controlled Concentrations of Interfacial Active Elements ISIJ International Advance Publication
  4. Intra-Particle Water Migration Dynamics during Iron Ore Granulation Process Tetsu-to-Hagané Vol.105(2019), No.11
  5. Composition Change of Inclusions in High Carbon Steel before and after Addition of Aluminum Tetsu-to-Hagané Vol.105(2019), No.11
  6. A Visual PCI Blockage Detection in Blast Furnace Raceway ISIJ International Advance Publication
  7. Optimization of Discharge Parameters for a Glow Discharge Emission Spectrograph with Two-dimensional Spatial Resolution ISIJ International Advance Publication
  8. 3D Crystal Orientation Mapping of Recrystallization in Severely Cold-rolled Pure Iron Using Laboratory Diffraction Contrast Tomography ISIJ International Advance Publication
  9. Multiphase Flow Behavior in a Single-Strand Continuous Casting Tundish during Ladle Change ISIJ International Advance Publication
  10. Melting Behaviour of Iron Ore Pellet Bed under Nut Coke Mixed Charge Conditions ISIJ International Advance Publication

Search Phrase Ranking

19 Nov. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. cohesive zone
  5. hot rolling
  6. pellet
  7. basicity
  8. alternating current electrolyzing method for colored stainless steel
  9. steel
  10. argon bubbles