1988 Fiscal Year Final Research Report Summary
Development of a Direct-Drive Servomechanism for Use in Robots with Six Degrees of Freedom and Consisting of Servo Actuators Using Metal Hydrides
| Project/Area Number |
62850030
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Kobe University |
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Principal Investigator |
TAKAMORI Toshi Professor,Faculty of Engineering,Kobe University, 工学部, 教授 (10031098)
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| Co-Investigator(Kenkyū-buntansha) |
MURAO Yoshio Manager,Development Group,Taiyo Tekko, 開発グループ, 部長
YAMAZAKI Yoshiharu Research Assistant,Faculty of Engineering,Kobe University, 工学部, 教務職員 (90174648)
TADOKORO Satoshi Research Associate,Faculty of Engineering,Kobe University, 工学部, 助手 (40171730)
KIMURA Ichiro Associate Professor,Faculty of Engineering,Kobe University, 工学部, 助教授 (60031134)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Robotics / Joint of Six Degrees of Freedom / Direct Driving / MH Actuator / 空気圧アクチュエータ |
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| Research Abstract |
The joint structure consists of an assembled system by N actuators in translation. The number N has been determined according to the simulation results on joint statics: The simplicity of structure and the width of moving area are considered in evaluating it. Then, it has been made clear that more than n=6 are necessary for getting the movememnts of 6 degrees of freedom and that there is nothing different between N=6 and N=8 in the width and the controllability. So, N=6 was selected in this case the two important software systems on the dynamics of joint movement have been successfully completed to calculate joint positions and orientations by giving the lengths of each actuators and vice versa. These are useful in designing the controller.
Though MH(Metal Hydride) actuators should be used in this joint structure, penumatic actuators have been used in this study practically. The reasons were already written in another report of 1988. The control system has been constructed by a computer based PID controller and a PWM circuit. The accurate mathematical model of actuators was determined by the signal processing and the law of physics. The position control has been done to this joint of 6 degrees of freedom. The results are as follows:
(1)though the effects of mutual interference were not small between each actuators, the control for every degrees of freedom was accurate and its response time was about 1 second.
(2)The wind-up of I element in the PID controller made the over-shoot decrease and then improved control characteristics.
The future problems at control in this study are to decrease effects of the interference between actuators and to compensate effects of non-linear elements.
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