記述言語：日本語   出版者・発行元：一般社団法人電子情報通信学会  

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：The Japan Society of Mechanical Engineers  

This paper proposes a relative position and attitude control method by using only magnetic force with multi-dipole for formation-flying spacecrafts. The control method can be widely applied to re-configurable space structures that architect large structure or reconstruct themselves by assembling basic structural units. One remarkable benefit of the method is that it does not require reaction wheels for relative attitude controls and then fuels for unloading. This paper focuses on current control of dipoles which produce strong nonlinear magnetic forces and suggests a way of linearization by using a corresponding linear reference system. A feasibility of this method and controllability of the strong nonlinear system is discussed, and then the series of position and attitude control simulation are shown, and the future works are suggested in the paper.

DOI： 10.1299/kikaic.79.1540

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

CiNii Books

researchmap

記述言語：英語   出版者・発行元：The Japan Society of Mechanical Engineers  

This paper proposes a relative position and attitude control method by using only magnetic force with multi-dipole for formation-flying spacecrafts. The control method can be widely applied to re-configurable space structures that architect large structure or reconstruct themselves by assembling basic structural units. One remarkable benefit of the method is that it does not require reaction wheels for relative attitude controls and then doesn't require any fuel for unloading. This paper focuses on current control of dipoles which produce strong nonlinear magnetic forces and suggests a way of linearization by using a corresponding linear reference system. A feasibility of this method and controllability of the strong nonlinear system is discussed, and then the series of position and attitude control simulation are shown, and the future works are suggested in the paper.

DOI： 10.1299/spacee.6.44

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

One of the most important issues in space structure designs is to reduce total weight of the structure. Structural size of a solar cell paddle for spacecraft becomes large corresponding to increasing electric power requirements for future advanced missions. Lightweight structures can be adopted for many space applications considering growing requirements of future missions. In the design of solar array paddles deployable structure has a large percentage of the total weight. In the deployment mechanism, using components with low rigidity and lightweight may reduce the total weight. Then we should consider influence of the deployment mechanism on structural characteristics. We performed structural analysis and experiment to clarify the dependence of the dimension and the configuration of deployment mechanism. As a result, we found that the influence on the vibration characteristics of the deployment mechanism like a hinge disposed between the panels against large structure is small and in particular the influence of the bending stiffness in the vertical direction of the panel surface is large. We found that it becomes possible to lightweight by obtaining optimum design parameters such as the Young's modulus and the cross-sectional area of deployment mechanism corresponding to the scale of structure.

CiNii Books

researchmap

記述言語：日本語  

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

This research proposes a relative position and attitude control method using magnetic force with dipole magnets for formation-flighting spacecrafts without reaction wheels. This technology can be widely applied to re-configurable space structures that architect or/ re-structure themselves by assembling basic structural units. One remarkable benefit is that this control method can extend mission term in comparison to conventional control methods with magnetic force because spacecrafts never require any types of fuel for position controls or unloadings. This paper focuses on current control of dipoles which produce strong nonlinear magnetic forces and suggested a way of linearization of a nonlinear system for control. Also feasibility of this method and controllability are investigated, then the series of attitude control simulation are shown, and the next step for developing this technology will be discussed in the following chapter.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：情報通信研究機構  

CiNii Books

researchmap

記述言語：日本語  

A buckling analysis method based on Co-rotational formulated FEM for flexible multi body beam structures is proposed. This method makes it possible to analyze light weight deployable beam structures that may be subjected to buckling load. This paper especially focuses on a method of buckling mode identification and buckling mode injection while a structure undergoes mechanical motion. In this method, a buckling mode is estimated even though a bifurcation point is not accurately obtained. The validity of this method is confirmed in a numerical examination.

J-GLOBAL

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

A formula of multibody finite element analysis based on the corotational formulated finite element method and the direct coordinate partitioning for deployable truss structures is proposed. A beam element used in linear finite element analyses is a basic element in the formula. A corotational frame is defined by node coordinate systems attached to a beam element. A tangent stiffness matrix contains a virtual rotation displacement of the corotational frame. By the appropriate transformation of this virtual displacement, a simple geometric stiffness for the formula is obtained. The formula makes it possible to analyze the deploying motions of large deformed deployable truss structures, to be applicable to general finite elements, and to increase convergence speed of the Newton method in a solution algorithm. This improvement is achieved by neglecting virtual work done by rigid body motion in the process of employing the geometric stiffness to the conventional formula. A validity of this formula is confirmed through results of a numerical deployment analysis of a deployable beam structure.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人電子情報通信学会  

衛星インターネットに用いられる衛星搭載Kaバンドマルチビームアンテナの設計法について述べる。高利得で且つ連続的に所望の領域を覆うため、RF的に放射器が稠密配置となるように、偏波識別板を使用している。日本本土及び沖縄を9ビームで覆う方式とし、水平、垂直偏波を交互に配置し、ビーム間干渉を回避するとともに、ビーム2個飛ばしによる周波数再利用を可能としている。さらにRFセンサを用いた閉ループによるアンテナビーム指向により、指向損失を最小化している。

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人電子情報通信学会  

衛星インターネットに用いられる衛星搭載Kaバンドマルチビームアンテナの設計法について述べる。高利得で且つ連続的に所望の領域を覆うため、RF的に放射器が稠密配置となるように、偏波識別板を使用している。日本本土及び沖縄を9ビームで覆う方式とし、水平、垂直偏波を交互に配置し、ビーム間干渉を回避するとともに、ビーム2個飛ばしによる周波数再利用を可能としている。さらにRFセンサを閉ループによるアンテナビーム指向により、指向損失を最小化している。

CiNii Books

researchmap

システムパラメータが可変なスマート構造システムの，フィードバック線形化を用いて構造・制御同時最適化を行う手法を提案する．ここでは，可変な慣性，あるいは粘性，剛性等のシステムパラメータを変化させ，自らの制御を行うことが可能なスマート構造システムを扱う．このようなシステムは非線形であり，また，構造システム及び制御システムとしての特性を持つ．本稿で提案する手法は，スマート構造システムに対し，フィードバック線形化を用いてシステムを線形化することで，線形理論を用いた最適化を可能にすることに特徴がある．線形化されたシステムは，BMI求解アルゴリズムによる構造・制御同時最適化を行い，システムの最適化が達成される．数値例として，簡単な有限要素モデルに対し本手法を適用して最適化を行い，本手法の有効性を確認する．

researchmap

記述言語：日本語  

A formula of multibody finite element analysis based on the corotational formulated finite element method and the direct coordinate partitioning for deployable truss structures is proposed. A beam element used in linear finite element analyses is a basic element in the formula. A corotational frame is defined by node coordinate systems attached to a beam element. A tangent stiffness matrix contains a virtual rotation displacement of the corotational frame. By the appropriate transformation of this virtual displacement, a simple geometric stiffness for the formula is obtained. The formula makes it possible to analyze the deploying motions of large deformed deployable truss structures, to be applicable to general finite elements, and to increase convergence speed of the Newton method in a solution algorithm. This improvement is achieved by neglecting virtual work done by rigid body motion in the process of employing the geometric stiffness to the conventional formula. A validity of this formula is confirmed through results of a numerical deployment analysis of a deployable beam structure.

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

The buckling analysis method based on Corotational formulated FEM for complex flexible multibody beam structures is proposed. This method makes it possible to analyze light weight deployable beam structures that may be subjected to buckling taking into account the geometric nonlinearity stemming from large rotations. The mechanical motion, elastic deformation and buckling can be handled by the consolidated mathematical treatment and computational algorithm presented in this paper. This paper especially focuses on a buckling mode injection method while a concerned structure undergoes mechanical motion. A buckling mode is estimated even though a bifurcation point is not accurately obtained. The validity of this method is confirmed in a numerical examination.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

We've been investigating large deployable antennas that sizes have 10 to 20 m. As its mechanical scale is getting large, shape measurement and prediction by ground test become difficult. Then the shape analysis is important. The electrical surfaces of these antennas are composed of metallic mesh and cable network. The mesh component has membrane characteristics. In this study, we describe some analysis results of membrane and cable structures for deployable antennas.

CiNii Books

researchmap

記述言語：日本語  

The buckling analysis method based on Corotational formulated FEM for complex flexible multibody beam structures is proposed. This method makes it possible to analyze light weight deployable beam structures that may be subjected to buckling taking into account the geometric nonlinearity stemming from large rotations. The mechanical motion, elastic deformation and buckling can be handled by the consolidated mathematical treatment and computational algorithm presented in this paper. This paper especially focuses on a buckling mode injection method while a concerned structure undergoes mechanical motion. A buckling mode is estimated even though a bifurcation point is not accurately obtained. The validity of this method is confirmed in a numerical examination.

researchmap

記述言語：英語   出版者・発行元：THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES  

A formula of variable inertia systems, which contain controllable inertia, is introduced, and a feedback linearization technique for the variable inertia systems is proposed. This linearization technique allows us to control the variable inertia systems through linear control methods without linear control inputs. The formula of variable inertia systems consists of two subsystems related to rotation and variable inertia. The rotational subsystem contains an ordinary differential equation, and the subsystem of variable inertia is independent from the alternative subsystem. Because of these system properties, the proposed technique is composed of a noninteracting condition to linear control inputs for the rotational subsystem, and a servo controller for the subsystem of variable inertia to satisfy the noninteracting condition. The resulting closed-loop system becomes linear. To validate the feedback linearization technique, a vibration suppression controller for a 2-DOF variable inertia system without dampers is derived, and numerical simulations of the controlled system are carried out. The simulation results confirm that the system is sufficiently controlled through the feedback linearization technique without linear control inputs.

DOI： 10.2322/tjsass.45.1

CiNii Books

researchmap

その他リンク： https://jlc.jst.go.jp/DN/JALC/00156870052?from=CiNii

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

Future space missions will require increasingly large and flexible space structure systems. Because their system properties are difficult to be precisely identified, to control the systems with the stability and control performance guaranteed, we have to consider the system uncertainties which could be caused by identification errors or uncontrolled modes. A model expression, an identification method, and a control method proposed in this paper can explicitly deal with the uncertainties by applying the fuzzy theory. This control method for the systems ensures their stability with prescribed admissibility and reliability. The validity of the identification method and the control method are confirmed by a numerical example with a conventional control method.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人情報処理学会  

本論文では，可変慣性システムを定義し，このシステムに対する外乱無干渉化コントローラを導出する．これにより，慣性モーメントが可変で制御に利用することが可能な回転をともなうシステムに対して，制御トルクなどを用いずに外乱抑制を行うことができる制御手法が得られる．また，可変慣性システムは線形システムや双線形システムとは異なる性質を持つため，このシステムの制御手法として非線形制御手法の1つである外乱無干渉化制御を用いることを提案し，コントローラを次のようにして導出した．まず，システムの性質を調べ，可変慣性システムを定義する．次に，可変慣性システムの既知外乱無干渉化条件および外乱オブザーバを導出し，無干渉化条件を満たすためのサーボコントローラを設計する．これらを合わせることで，外乱無干渉化コントローラが得られる．さらに，数値例を用いて詳細なコントローラの設計手順を示し，数値シミュレーションによりその制御効果を確認する．Variable inertia systems, which include variable moment of inertia and can be controlled by changing the moment of inertia, are formulated and their noninteracting controllers are derived for the systems to suppress disturbances. The formula of variable inertia systems consists of two subsystems related to rotation and variable inertia. The rotational subsystem contains an ordinary differential equation and the subsystem of the variable inertia is independent. Because of these system properties, it is proposed that the noninteracting controllers are employed for the systems, and derived from a noninteracting condition for the rotational subsystems to known disturbances, a disturbance estimator, and a servo controller for the subsystem associated with the variable inertia. Then the resulting closed loop system is noninteractive to disturbances. For a demonstration and a confirmation of the control effectiveness, a detailed application of the procedure of the noninteracting controller design and results of numerical simulations for an example are illustrated.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

This paper proposes a method for solving BMI problems in simultaneous design of structure and control systems. This method transfers simultaneous design problems with H_∞, H_2, and pole placement constraints described by BMIs into dual-LMI problems by Schur complement, and locally solves the problems through the cone complementary linearization algorithm. A simple numerical example indicates that the method comparatively quickly finds a structured controller which contains structural parameters.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人情報処理学会  

本論文では，可変慣性システムを定義し，このシステムに対する外乱無干渉化コントローラを導出した．また，可変慣性システムは線形システムや双線形システムとは異なる性質を持つため，このシステムの制御手法として外乱無干渉化制御を用いること，ならび既知外乱無干渉化制御，外乱オブザーバ，サーボコントローラを導くことにより外乱無干渉化制御を実現することを提案した．これにより，可変慣性を持たせることが可能な主に回転を伴うシステムに対して，制御トルクなどを用いずに外乱抑制を行うことができる制御手法が実現した．さらに，数値例に対してコントローラを設計し，数値シミュレーションによりその制御効果を確認した．Variable inertia systems, whose inertia is variable and can be used to control the systems, are formulated and their noninteracting controllers are derived. Because the systems contain variable inertia term, it is proposed that the noninteracting controllers are employed for the systems, and derived from a noninteracting condition to known disturbances, a disturbance estimator, and a servo controller to satisfy the condition. Then the resulting closed loop system is noninteractive to disturbances. For a confirmation of the control effectiveness, results of numerical simulations for an example with the noninteracting controller are illustrated.

CiNii Books

researchmap

記述言語：日本語   出版者・発行元：一般社団法人日本機械学会  

In this paper, a simultaneous design method for systems with variable inertial term is proposed. Because conventional control methods can hardly deal with the system due to the variable inertial term, a noninteracting control is applied to linearize the system. In addition, to insure the reliability of the imperfectly linearized system, evaluation methods in H_2 and H_∝ are determined. Through the linearization method and the evaluation methods, conventional linear control methods can be applied to the system. The property of this structure system concerns the control performance so that the simultaneous design method of structure and control is employed to design the controlled system. This design method is applied to an example of a system with variable inertial term, and it is confirmed that the method can design the controller and improve the control performance.

CiNii Books

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318844  出願日：2003年9月

公開番号：特開2005-086698  公開日：2005年3月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318844  出願日：2003年9月

公開番号：特開2005-086698  公開日：2005年3月

特許番号/登録番号：特許第3891972号  発行日：2006年12月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318845  出願日：2003年9月

公開番号：特開2005-086699  公開日：2005年3月

特許番号/登録番号：特許第3889384号  発行日：2006年12月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318862  出願日：2003年9月

公開番号：特開2006-080578  公開日：2006年3月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318847  出願日：2003年9月

公開番号：特開2006-080577  公開日：2006年3月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318846  出願日：2003年9月

公開番号：特開2005-082092  公開日：2005年3月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2003-318845  出願日：2003年9月

公開番号：特開2005-086699  公開日：2005年3月

J-GLOBAL

researchmap

出願人：日本電信電話株式会社

出願番号：特願2002-211347  出願日：2002年7月

公開番号：特開2004-054605  公開日：2004年2月

J-GLOBAL

researchmap