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システム/制御/情報 Vol. 15 (2002), No. 5

ISIJ International
belloff
オンライン版ISSN: 2185-811X
冊子版ISSN: 1342-5668
発行機関: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

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システム/制御/情報 Vol. 15 (2002), No. 5

切替えと状態ジャンプを持つハイブリッドシステムに対するWell-posedness解析

原 辰次, Shinji HARA

pp. 223-231

抄録

A general framework for hybrid dynamical systems is proposed for the modeling of certain classes of dynamical systems consisting of mixed continuous-time/logical dynamics and autonomous discontinuities. Separating different dynamics into two subsystems connected through interfaces, our proposed hybrid model offers generality and also high level of compatibility with existing approaches. The main theoretical result in the paper concerns the well-posedness property (existence and uniqueness of solutions) of the system. We derive a sufficient condition of the well-posedness property which proves that nondeterminism and livelock phenomenon do not exist in the system dynamics.

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切替えと状態ジャンプを持つハイブリッドシステムに対するWell-posedness解析

切り替えシステムの安定性

藤澤 大亮, 村松 鋭一

pp. 232-237

抄録

We consider stability of a switched system which consists of multiple linear time-invariant subsystems. It is assumed that the state coefficient matrices of the subsystems belong to a certain class and the subsystems are switched according to their dwell times. We present a necessary and sufficient condition for stability of the switched system in terms of eigenvalues of the coefficient matrices and the dwell times of the subsystems.

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切り替えシステムの安定性

相補性システム表現を持つフィードバック制御系

岩谷 靖, 石川 将人, 原 辰次

pp. 238-245

抄録

This paper is concerned with well-posedness (existence and uniqueness of solutions) problem of hybrid feedback systems and its application. We first consider feedback interconnections of complementarity systems and derive a sufficient condition for the closed loop systems to be well-posed. We then apply the result to design of a switching controller which belongs to complementarity systems for a driftless nonholonomic system, where the well-posedness of the feedback system is guaranteed and the norm of steady-state error is less than each given value.

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相補性システム表現を持つフィードバック制御系

非ホロノミックチェインドシステムのハイブリッド時間軸状態形による最適制御

小林 啓吾, 柴田 雄吾, 潮 俊光

pp. 246-252

抄録

In this paper, we propose a control method for nonholonomic chained systems. We transform the systems into time-invariant linear systems using a hybrid time-state control form and solve an optimal control problem to get an optimal trajectory with a switching point. The optimal input is derived as a feedback controller for the system. We apply the proposed method to a 4-wheeled vehicle and give numerical simulation results to show its effectiveness.

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非ホロノミックチェインドシステムのハイブリッド時間軸状態形による最適制御

記号入出力型コントローラによる二輪走行車両のライン追従制御

小中 英嗣, 鈴木 達也, 大熊 繁

pp. 253-261

抄録

Hybrid Dynamical Systems (HDS), which contain both discrete symbol and continuous signal, are attracting great attention in the field of system control. In this paper, a new symbol based control strategy for a line following control of a two wheeled vehicle is proposed. The vehicle is supposed to have a low-resolution sensor and actuator. The control requirement, however, is specified so as to keep the vehicle as close as possible to the center of the line. The controllability and observability issues are investigated, and a concrete control policy based on the continuous state estimation is proposed. Some experimental results are shown to demonstrate the usefulness of our idea.

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記号入出力型コントローラによる二輪走行車両のライン追従制御

切替システムの安定解析とその応用について

増淵 泉

pp. 262-269

抄録

This paper is concerned with stability analysis of switched systems and its application for synthesis problems. For a class of switched systems, we propose a discontinuous Lyapunov-like function to derive a condition that guarantees exponential stability of switched systems. This condition is stated with LMIs for switched systems that have linear continuous dynamics and an output feedback switch-scheduled control design method is presented in terms of LMIs. These results are applied to control design of a class of nonholonomic systems in the time-state control form.

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切替システムの安定解析とその応用について

相補性システム表現に基づく跳躍システムの制御

齋藤 豊, 石川 将人, 原 辰次, 関 卓史

pp. 270-277

抄録

In this paper, we propose an optimal high jump control strategy for a jumping robot system, based on complementarity modeling approach. The jumping robot system is composed of a simple jumper part, an environment (trampoline) part and some hooks to limit the robot length. It is essentially a hybrid system, due to variable mechanical constraints, such as collision with trampoline, and length limitations. At first, we provide an efficient model of the system as a complementarity-slackness, which enables us to handle discontinuous phenomena of hybrid systems, i.e., discontinuous change of dynamics and leap of solution, in a unified and mathematically sound framework. Then we formulate the high jump problem as a maximizing problem of the peak height of the robot's center of gravity in a given time interval. The optimal control is derived numerically by performing a dynamic programming algorithm, and its validity is verified with computer simulations. The advantage of this modeling approach is that we need not to deal with the awkward variable constraints when we formulate control problem, since they are all considered in the model itself.

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相補性システム表現に基づく跳躍システムの制御

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