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Your search keyword '"Koyama, Takeo"' showing total 112 results
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112 results on '"Koyama, Takeo"'

3. An object-oriented design tool toward CIM for shipbuilding

Author

Shimizu, Ken, Koyama, Takeo, Goos, G., editor, Hartmanis, J., editor, Barstow, D., editor, Brauer, W., editor, Brinch Hansen, P., editor, Gries, D., editor, Luckham, D., editor, Moler, C., editor, Pnueli, A., editor, Seegmüller, G., editor, Stoer, J., editor, Wirth, N., editor, Sriram, Duvvuru, editor, Logcher, Robert, editor, and Fukuda, Shuichi, editor

Published
1991
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33. H∞ control design to include nonlinearities. Second report: nonlinearities in equations of motion.

Author

Tan, Fengyang, Yamato, Hiroyuki, and Koyama, Takeo

Abstract

In our first report, a method to deal with the nonlinearity of saturation was proposed. A method of dealing with nonlinearity in equations of motion is proposed in this paper. The nonlinear equations of motion are expressed as variations of linear equations of motion. The nonlinear equations can be linearized around a specific point with a tangential plane or line. Accordingly, nonlinear equations effective in a certain domain can be obtained by variations in this tangential line. A control system with varying elements can be designed using the general H∞ control theory. As an example, we present a speed and heading changing system for large vessels at low speeds during berthing maneuvers, where the equation will vary during motion. The nonlinearity of the equations is caused by the speeds. The control system is essentially designed to be robust in disturbance and noise. In this example, the saturation in the propeller is also considered using the method proposed in the first report. The results show that the method proposed in this paper is effective. [ABSTRACT FROM AUTHOR]

Published
2002
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34. H ∞ control design to include nonlinearities. First report: saturation of the rudder.

Author

Tan, Fengyang, Yamato, Hiroyuki, and Koyama, Takeo

Abstract

In designing a control system for large vessels, there are two kinds of nonlinearities which must be considered. One is the nonlinearity in equations of motion and the other is the saturation in control devices such as engine output or rudders. These nonlinearities can strongly affect the performance of the control system. A new method to deal with the nonlinearity of saturation has been proposed in this paper. The saturation is considered as a variation of gain in the system. A control system with gain variation can be designed by H∞ control theory. As an example, a course-keeping control system for a course-unstable ship has been presented. The results show that the method proposed is effective. [ABSTRACT FROM AUTHOR]

Published
1999
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35. H ∞ control design to include nonlinearities. First report: saturation of the rudder

Author

Tan, Fengyang, Yamato, Hiroyuki, and Koyama, Takeo

Abstract

Abstract:: In designing a control system for large vessels, there are two kinds of nonlinearities which must be considered. One is the nonlinearity in equations of motion and the other is the saturation in control devices such as engine output or rudders. These nonlinearities can strongly affect the performance of the control system. A new method to deal with the nonlinearity of saturation has been proposed in this paper. The saturation is considered as a variation of gain in the system. A control system with gain variation can be designed by H ∞ control theory. As an example, a course-keeping control system for a course-unstable ship has been presented. The results show that the method proposed is effective.

Published
2000
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36. Synthetic Studies of Cobalt Carbonyl by Noble Metal Catalysts. II. The Investigation of Reaction Conditions

Author

Usami, Seiji, Nishimura, Kotaro, Koyama, Takeo, and Fukushi, Saburo

Abstract

The reaction conditions of cobalt carbonylation catalyzed by palladium have been investigated. Polar solvents have, with some exceptions, been shown to be superior to nonpolar solvents. The fact that the total pressure of synthesis gas and the partial pressure of hydrogen, especially the latter, have a great effect on the initiation temperature of reaction suggests that the presence of hydrogen is very important in the present reaction. The low reactivity and poor yield in the reactions of Raney cobalt indicate that a low-valency intermediate in the course of the cobalt-carbonylation reaction of cobaltous compounds may be somewhat different from the Raney-type Co(0). The initial step of the reaction seems to be affected only a little by various additives e. g., water, triphenyl phosphine, lead naphthenate, and sodium hydroxide. The data previously available suggest that a palladium catalyst may primarily promote the reduction of Co (II) to Co(0) by activating hydrogen. The test of the lifetime of a palladium-on-carbon catalyst for a month indicates that there is no apparent decrease in the catalytic activity within this period.

Published
1969
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