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. 8 (1995), No. 7

  • Measurement and Its Evaluations of Cogging Torque for Lundell Alternator

    pp. 277-284

    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.8.277

    It is extremely difficult to investigate cogging torque of a rotating electric machine precisely. Two dimensional finite element based analytical approaches have been developed and implemented for the magnetic force in general salient-pole motors. However, for Lundell alternators which are widely used for factory automation, automobiles and so on, it is necessary to use three dimensional analysis. In this paper, a new and precise cogging torque measurement method and the data processing technique are proposed for Lundell alternator. By using this method, practical test data for a Lundell alternator are presented and the characteristics of cogging torque are clarified and evaluated.
  • Maximum Likelihood Time-Delay Estimation of Signals in Random Data

    pp. 285-293

    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.8.285

    A fast method of Newton-Raphson-based algorithm is presented for maximum likelihood estimation of the time-delay as well as the attenuation parameter of received signals in observation data corrupted by white Gaussian noise. Based on the mathematical method described by an Ito stochastic differential equation for the noisy observation data, the likelihood-ratio function is derived instead of the usual likelihood function, and the Cramér-Rao lower bounds for the time-delay and attenuation estimates are evaluated in a modified form using the likelihood-ratio function to show the uncertainty relation between these two estimates. Unbiasedness of these two estimates are theoretically demonstrated. Simulation results that confirm the effectiveness of the proposed method are given.
  • Strictry Proper Digital Filters with Hypercomplex Coefficients and Reduction of Multiplications in Hypercomplex Algebra

    pp. 294-302

    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.8.294

    In this paper, we consider strictly proper digital filters with hypercomplex coefficients, and we also consider reduction of multiplications in hypercomplex algebra.
    As for the former problem, the first-order digital filter with hypercomplex coefficients can realize arbitrary-order strictly proper digital filters with real coefficients less than 4, whose order of numerator is smaller than that of denominator by 1.
    As for the latter problem, if we apply Quadratic Residue Number System to hypercomplex algebra, we can reduce the number of multiplications to 1/4 of the original one. And the most important thing of this result is that we only need 4 multiplications per multiplier and that these 4 multiplications can be done at the same time.
  • Trajectory Control of Manipulators Based on Discrete Time Learning Control with 2-Delay Input Control Technique

    pp. 303-311

    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.8.303

    A learning control based on repetitive operations of robotic manipulators is one of the most promising method to realize high speed and high precision control for robotic manipulators. The joint servo system usually has an unstable zero in discrete-time domain. This fact leads to unstable learning, when a sampling period is small. In previous paper, we have proposed a new learning algorithm based on so-called 2-delay input method, By using the 2-delay input method we can stabilize the unstable zero and realize the stable learning even if the sampling period is small. However, concrete algorithm for parameter design and experimental results have not been shown yet. In this paper, we propose new design algorithm of two parameters in 2- delay input system especially to suppress ripple of the trajectory and show some experimental results to verify effectiveness of the proposed method.
  • DecentralizedH Control of Large-Scale Systems

    pp. 312-319

    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.8.312

    This paper considers decentralizedHcontrol problems for large-scale interconnected systems, the information structure constraints of which are conformable to the subsystems. Both output feedback and state feedback are dealt with. The design of localHcontrollers involves solving two algebraic Riccati equations of the subsystem dimensions. Sufficient conditions on the interconnections among subsystems are presented for desiredH attenuation bounds to be achieved from the overall disturbance inputs to the overall controlled outputs by localHcontrollers.

Article Access Ranking

16 Apr. (Last 30 Days)

  1. Three-dimensional Investigations of Non-metallic Inclusions in Stainless Steels before and after Machining 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. Influence of Ore Assimilation and Pore Formation during Sintering on Reduction Behavior of Sintered Ores Tetsu-to-Hagané Vol.107(2021), No.3
  4. Numerical Simulation of Flow, Heat, Solidification, Solute Transfer and Electromagnetic Field for Vertical Mold and Curved Mold of Billet ISIJ International Vol.61(2021), No.3
  5. Structural and Mechanical Characterizations of Top Dross in a Molten Zinc Bath ISIJ International Vol.61(2021), No.3
  6. Dissolution Behavior of Mg and Ca from Dolomite Refractory into Al-killed Molten Steel ISIJ International Advance Publication
  7. Deformation Behavior of Longitudinal Surface Flaws in Flat Rolling of Steel Wire ISIJ International Advance Publication
  8. Numerical Study into Gravity Separation of Phosphorus from BOS Slag during Solidification ISIJ International Vol.61(2021), No.3
  9. Prediction of Spatial Composition Distribution of Inclusions in the Continuous Casting Bloom of a Bearing Steel under Unsteady Casting ISIJ International Vol.61(2021), No.3
  10. Improvement in Reduction Behavior of Sintered Ores in a Blast Furnace through Injection of Reformed Coke Oven Gas Tetsu-to-Hagané Vol.107(2021), No.4

Search Phrase Ranking

16 Apr. (Last 30 Days)

  1. blast furnace
  2. coke oven gas injection
  3. tetsu-to-hagané
  4. blast furnace productivity
  5. slag
  6. blast furnace permeability
  7. continuous casting of electrical steel
  8. deoxygen in liquid iron
  9. electrical steel and continuous casting
  10. equilibrium of deoxygen in liquid iron