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. 32 (2019), No. 8

  • Effect of Zero-cost Interval in Running Cost for Stochastic Impulse Control Problems

    Ryosuke Naito , Kazuhiro Yasuda

    pp. 301-308

    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.32.301

    Abstract

    Effects of a zero-cost interval of a running cost on exercise boundaries in stochastic impulse control problems are considered. To study it, we basically use a numerical algorithm given in [1]. However, convergences of its numerical solutions to the true solution in their algorithm under our settings here are not theoretically guaranteed, therefore we first extend their theorems related to convergences and mathematically prove it. Then using the valid algorithm, relations between the zero-cost intervals and the value function or optimal strategies are numerically studied.

  • On the Worst Disturbance of Airplane Longitudinal Motion using the Generic Transport Model

    Kenji Sawada , Yoshiro Hamada , Hideki Fukunaga , Seiichi Shin

    pp. 309-317

    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.32.309

    Abstract

    In gust alleviation control synthesis, it is important how to generate the worst disturbance that has the worst effects on aviation. This paper applies the worst disturbance method based on H∞control to a linearized airplane motion model and provides new insights into the relationship between the initial condition and the worst disturbance. In addition, this paper utilizes Generic Transport Model (GTM) which is a nonlinear airplane motion model developed by NASA and discusses whether the linear model results are applicable for GTM. The first result is that the proposed worst disturbance algorithm allows us to analyze the relation between the initial conditions and short-period/Phugoid modes of longitudinal motion and especially tends to decrease the damping ration of the short period mode. The second result is to show that H∞control is applicable for GTM within the small perturbation around the trim condition and there are the same oscillation behaviors between the linear and nonlinear models.

  • Feedback Control of Vibration Generator's Load to Maintain the Vibrating Body's Oscillation Amplitude at a Reference Value

    Kazuki Nagai , Kiyora Saito , Chikashi Inada , Yasuhide Kobayashi

    pp. 318-326

    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.32.318

    Abstract

    This paper considers the problem of controlling a vibrating body's amplitude by varying the load of the vibration generator. We propose a feedback control system for a variable load whose command is the output signal of a proportional integral (PI) controller, which is driven by the deviation between the reference value and the estimated oscillation amplitude. The amplitude is estimated by using the absolute value function and a low-pass filter (LPF). An experiment is carried out with a mass-spring-damper system, which indicates the validity of the proposed method by showing that the closed-loop system becomes stable when PI gains (KP , KI) are appropriately chosen. Furthermore, this paper provides a theoretical guarantee of the closed-loop stability of the proposed system by assuming second- and forth-order plant models. The stability conditions are derived using linear approximation of the nonlinear system around the equilibrium point. The validity of the stability conditions are shown by numerical simulations. The stability condition is consistent with the experimental results: the boundary line on the KP −KI plane has a positive slope and a positive segment KI > 0 at KP =0.
  • © 2019 THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

Article Access Ranking

13 Dec. (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. Numerical Simulation on Influence of Coke Oven Gas Injection on Iron Ore Sintering ISIJ International Advance Publication
  4. Corrosion Behavior of Alumina Containing Refractory in Blast Furnace Hearth by CaO–SiO2–MgO–Al2O3–Cr2O3 Slags ISIJ International Vol.59(2019), No.11
  5. State of the Art in the Control of Inclusions in Spring Steel for Automobile - a Review ISIJ International Advance Publication
  6. Mathematical Modelling Study of Dynamic Composition Change of Steel and Mold Flux in Continuous Casting of Steel ISIJ International Vol.59(2019), No.11
  7. Nanostructured Bainitic Bearing Steel ISIJ International Advance Publication
  8. Strain Rate Sensitivity of Flow Stress Measured by Micropillar Compression Test for Single Crystals of 18Cr Ferritic Stainless Steel ISIJ International Advance Publication
  9. Analysis of the Coke Particle Size Distribution and Porosity of Deadman Based on Blast Furnace Hearth Dissection ISIJ International Vol.59(2019), No.11
  10. Morphology Change and Carburization Characteristic of Iron Ore-Coal Composite During Reduction under a Simulated Condition of Blast Furnace ISIJ International Vol.59(2019), No.11

Search Phrase Ranking

13 Dec. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. steel
  5. hot rolling
  6. blast furnace productivity posco
  7. phosphatability
  8. argon bubbles
  9. cohesive zone
  10. ferrosilicon