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Transactions of the Institute of Systems, Control and Information Engineers Vol. 24 (2011), No. 9

ISIJ International
belloff
ONLINE ISSN: 2185-811X
PRINT ISSN: 1342-5668
Publisher: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

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  30. Vol. 8 (1995)

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  36. Vol. 2 (1989)

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Transactions of the Institute of Systems, Control and Information Engineers Vol. 24 (2011), No. 9

Real μ-analysis by Stability Feeler

Tadasuke Matsuda, Michihiro Kawanishi, Tanagorn Jennawasin, Tatsuo Narikiyo

pp. 211-222

DOI:

10.5687/iscie.24.211

Abstract

Computation of the real structured singular values μ has been known to be important for stability analysis of linear systems with structured uncertainty. The authors have proposed a method to obtain an upper bound and a lower bound of the real μ by Stability Feeler which is a tool for robust stability analysis proposed by the first author. In this paper we propose a region splitting and expanding method to reduce the conservativeness of the derived upper bound and lower bound. A numerical example show that the obtained results are nearly equal to the exact value of the real μ, which are less conservative than that derived by the other methods.

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Ris

Optimization of Sprue Shape for Die Casting Using CFD Simulator

Ken’ichi Kanazawa, Ken’ichi Yano

pp. 223-230

DOI:

10.5687/iscie.24.223

Abstract

Computational fluid dynamics (CFD) simulators have recently been used for optimization in die casting and various other fields. However, solving an optimization problem with a CFD simulator (CFD optimization problem) has the issue of uncertainty in the evaluated values from the CFD simulations. Such problems are, of course, difficult to optimize compared to general problems. In this paper, we propose an optimization algorithm that can search for good solutions to CFD optimization problems. We have appliedthe algorithm to the optimization of the sprue shape for die casting at an actual plant.

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State and Parameter Estimation for Dynamical Systems by Using Unscented Kalman Filter

Michiaki Takeno, Tohru Katayama

pp. 231-239

DOI:

10.5687/iscie.24.231

Abstract

This paper considers the state and parameter estimation problems for nonlinear dynamical systems by using the Unscented Kalman filter (UKF). Since unlike the extended Kalman filter (EKF), the UKF does not require Jacobians of nonlinear transformations, we show that the UKF can be used together with the higher order Runge-Kutta approximation. We then derive a Runge-Kutta based UKF algorithm for nonlinear dynamical systems. Numerical studies show that the Runge-Kutta based UKF provides better numerical results compared with EKF and UKF algorithms coupled with the Euler approximation.

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State and Parameter Estimation for Dynamical Systems by Using Unscented Kalman Filter

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