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. 18 (2005), No. 8

  • Data-based Stability Analysis for Linear Time-invariant Discrete-time System

    Un Sik PARK, Masao IKEDA

    pp. 269-275

    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.18.269

    Abstract

    This paper proposes a new framework of stability analysis for linear time-invariant discrete-time systems based on experimental input and output data, in which no mathematical model such as a state equation or transfer function is employed unlike conventional model-based stability analyses. In this framework, we first develop a data-based stability condition for open-loop systems by using a set of output data of a zero-input response, which constitutes a basis of the entire output data space. Then, we consider an output feedback control law and present a data-based stability condition for closed-loop systems by using a set of input and output data of the controlled system, whose linear combinations span the entire closed-loop data space. Both of these data-based stability conditions are derived by the Lyapunov's second method and enable us to investigate stability of dynamical systems directly from the behaviors, i.e., the input and output data.

  • Active Control System of Floor Impact Noise by Using Piezo-electric Actuators

    Sadao AKISHITA, Atsushi MITAN, Yuuichiroh MITANI, Shinya ITO

    pp. 276-283

    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.18.276

    Abstract

    This paper proposes a brand new active control panel system for reducing the floor impact noise, which is a main object of interest by residents in condominium in Japan. The active control of floor impact noise is realized by covering whole area of ceiling with the active panels of modular type, each of which insulates independently the impact sound emitted from the concrete slab structure. The active panel of 0.9 [m] ×0.9 [m] in dimension is comprised of light-weighted panel of honey-comb structure, five piezoelectric actuators and five acceleration sensors. A new actuator mechanism is developed, which has heterogeneous structure of piezo-electric element of bimorph type and soft plates of same size for mechanical reinforcement, and provides with the maximized displacement. The active control system reduces effectively vibrations in the panel, which are transmitted through support structures of the five actuators and excited by emitted sound wave from the ceiling surface of concrete slab structure. The system works as the robust feedback control system for rejecting the disturbance in the panel detected with the acceleration sensors. The result of the control experiment proved the effectiveness of the control system showing 6 [dB] reductions of the acceleration in the major vibration modes of the plate.

  • Estimating the Degree of Neutrality in Fitness Landscapes by the Nei's Standard Genetic Distance

    Yoshiaki KATADA, Kazuhiro OHKURA

    pp. 284-291

    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.18.284

    Abstract

    In recent years, not only ruggedness but also neutrality has been recognized as an important feature of a fitness landscape for artificial genetic search. In this paper, we propose the use of the Nei's standard genetic distance, which was originally proposed in population genetics, for estimating the degree of neutrality in fitness landscapes. The characteristics of the Nei's standard genetic distance are shown by applying the standard genetic distance to artificial evolution for tunably neutral NK fitness landscapes. Further investigations are conducted in a complex evolutionary robotics fitness landscape to validate the proposed method. The results show that neural network controllers changing the number of hidden neurons have different levels of neutrality as well as ruggedness in their landscapes. This suggests to us that the Nei's standard genetic distance in natural evolution can be successfully applied to estimating the degree of neutrality in artificial evolution after minor modifications.

  • LMI Stability Conditions for Neutral Time-delay Systems

    Kazunori YASUDA, Koujiro SAKAI

    pp. 292-297

    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.18.292

    Abstract

    In this paper, exponential stability for neutral time-delay systems is discussed. First a sufficient condition is driven by using the characteristic equation, which is corresponding to the small gain theorem in the input-output stability theory. Based on this condition, an LMI stability condition is given by estimating the bound of L∞ norm of the time-delay element using the Padé approximants. The condition can also be applied to retarded time-delay systems in a special case. Numerical examples illustrate that when the time-delay is relatively short the obtained condition is less conservative than previous LMI ones led from the Lyapunov stability theory.

  • On a Calculative Method for Multi-dimensional Solutions of Quantized Linear Discrete Optimal Control Problem with a Two-dimensional Performance Function

    Tsunehiro MUNAKATA, Ilham KERIM

    pp. 298-300

    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.18.298

  • © 2005 THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

Article Access Ranking

16 Jan. (Last 30 Days)

  1. In-Situ Observation Experimental Study on the Agglomeration and Dispersion of Particles at the Interface of High-temperature Melts ISIJ International Advance Publication
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. In situ Observation of Reduction Behavior of Multicomponent Calcium Ferrites by XRD and XAFS Tetsu-to-Hagané Advance Publication
  4. Preface to the Diamond Jubilee Issue on “Selected Topics in Iron and Steel and Their Processing toward the New Steel Age” ISIJ International Vol.60(2020), No.12
  5. Development and Prospects of Refining Techniques in Steelmaking Process ISIJ International Vol.60(2020), No.12
  6. Transformation from Ferrite to Austenite during/after Solidification in Peritectic Steel Systems: an X-ray Imaging Study ISIJ International Vol.60(2020), No.12
  7. Effects of Residual Stress on Hydrogen Embrittlement of a Stretch-Formed Tempered Martensitic Steel Sheet ISIJ International Advance Publication
  8. Numerical Approach to Comprehend for Effect of Melts Physical Properties on Iron-slag Separation Behaviour in Self-reducing Pellet ISIJ International Vol.60(2020), No.12
  9. Improved Hydrogen Embrittlement Resistance of Steel by Shot Peening and Subsequent Low-temperature Annealing ISIJ International Advance Publication
  10. Editors’ Postscript ISIJ International Vol.60(2020), No.12

Search Phrase Ranking

16 Jan. (Last 30 Days)

  1. blast furnace
  2. 西山記念技術講座
  3. blast furnace permeability
  4. blast furnace productivity
  5. j. f. elliott
  6. blast furnace burden distribution
  7. bottom dross
  8. carbon-containing pellet
  9. cog blast furnace injection
  10. cr2o3 al2o3