Steel Science Portal

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. 7

  • Design of the Single-Input, Single-Output Type-1 Deadbeat Servo System by Minimizing the Deviation Input Energy

    Eiji KONDO, Takanori KIYOTA, Teruo SUNAGA

    pp. 223-230

    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.2.223

    Abstract

    This paper discusses the design of a type-1 deadbeat servo system for a single-input, single-output discrete-time linear time-invariant system when the settling time is larger than the order of the controlled system. The type-1 deadbeat servo system is transformed into the deviation system. First, a theorem which relates the general deadbeat input is obtained. By using this theorem, the fixed terminal state problem is transformed into the free new terminal state problem. Then, the problem of minimizing the deviation input energy for the specified settling time is formulated, and the optimal deviation input is obtained implicitly by using the special Riccati equation. Finally, the optimal deviation input is obtained explicitly. This optimal feedback gain is independent of the initial state of the controlled system, the step command signal and the step disturbance.

  • Fuzzy Modeling and Its Application to the Prediction of Oxidant Concentrations

    Mikiko KAINUMA, Yoshiteru NAKAMORI

    pp. 231-240

    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.2.231

    Abstract

    Statistical methods are appropriate for the prediction around a median, but not around a quarter or three quarters. On the prediction of environmental phenomena, it is important to predict correctly at high concentrations and to reasonably explain the predictive formula.
    In this paper, we propose a method to predict phenomena composed of many complicated factors by modeling the process of human thinking and judgement. Input-output relations of the system are described in the form of if-then rules. Then using fuzzy reasoning, the behaviors of the system will be predicted. To improve the model, we adjust the parameters of the membership function, by the use of the non-linear optimization technique.
    We apply fuzzy modeling to the prediction of oxidant concentrations at Osaka area in Japan and show that it is appropriate for the prediction of phenomena with limited input-output data.

  • A Polynomial Matrix Approach to Doubly Coprime Stable Rational Factorizations

    Kenji SUGIMOTO, Yutaka YAMAMOTO

    pp. 241-246

    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.2.241

    Abstract

    This paper gives a new method for computing a doubly coprime factorization of a transfer function matrix. From a polynomial matrix factorization, the method easily derives proper stable rational matrices which give a doubly coprime factorization. This paper also clarifies a relationship between this method and the well-known method which uses state-space representation.

  • Positive Realness Conditions for a Family of Real Rational Functions with Interval Coefficients

    Takehiro MORI, Hideki KOKAME

    pp. 247-252

    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.2.247

    Abstract

    Necessary and sufficient conditions are derived for real rational functions with interval coefficients to be positive real or strictly positive real. In both cases, it is shown that checking positive realness or strict positive realness of only a finite number, sixteen, of functions are required to assure the same properties for the whole family. The main tools for these results are celebrated Kharitonov's theorem and its extended version, which have been paid attention to in these couple of years in association with robust stability problems.
    Inspections are also made into an interrelationship between the results obtained and the (extended) Kharitonov's theorems. Though a definite answer to the relationship has not yet been established, the problem, if resolved, would shed light on implications of the Kharitonov-type theorems in concrete physical systems, i.e., electrical network systems.
  • © 1989 THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

Article Access Ranking

17 Jun. (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. A Kinetic Model of Mass Transfer and Chemical Reactions at a Steel/Slag Interface under Effect of Interfacial Tensions ISIJ International Vol.59(2019), No.5
  3. Improvement of Sinter Strength and Reducibility through Promotion of Magnetite Ore Oxidation by Use of Separate Granulating Method ISIJ International Vol.59(2019), No.5
  4. Evaluation of the Structure and Strength of Coke with HPC Binder under Various Preparation Conditions ISIJ International Advance Publication
  5. Internal Friction Behavior Associated with Martensitic Decomposition in Low-carbon Dual-phase Steel ISIJ International Advance Publication
  6. Effects of Surface Microstructure on Selective Oxidation Morphology and Kinetics in N2 + 5%H2 Atmosphere with Variable Dew Point Temperature ISIJ International Vol.59(2019), No.5
  7. Numerical Investigation of Applying High-carbon Metallic Briquette in Blast Furnace Ironmaking ISIJ International Vol.59(2019), No.5
  8. Evolution Mechanism of Inclusions in H13 Steel with Rare Earth Magnesium Alloy Addition ISIJ International Advance Publication
  9. Surface Tension Calculation of Molten Slag in SiO2–Al2O3–CaO–MgO Systems Based on a Statistical Modelling Approach ISIJ International Vol.59(2019), No.5
  10. Direct Reduction Recycling of Mill Scale Through Iron Powder Synthesis ISIJ International Vol.59(2019), No.5

Search Phrase Ranking

17 Jun. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. deadman coke
  5. inclusions
  6. a structurally-based viscosity model of the fully liquid slags in the cao-mgo-al2o3-feo-sio2 system
  7. bubbling ladle
  8. isij xafs
  9. joo hyun park
  10. mold flux, b2o3