著者

原 敬 横川 隆一 甲斐 義弘

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.618, pp.604-609, 1998-02-25 (Released:2008-02-26)

参考文献数

12

被引用文献数

1 1

---

The purpose of this paper is to present a graphical method for evaluating task performance of a manipulator for a planar peg-in-hole assembly task. The manipulator has three revolute joints, including a compliant element, and performs the task in a plane. Further, an RCC (Remote Center Compliance) is mounted on the end-point of the manipulator. First, a force condition to avoid jamming on the chamfer is derived. A stiffness condition at the compliance center of the RCC is then obtained from the force condition. Under the stiffness condition, the manipulator can avoid the jamming on the chamfer. Second, a graphical method is proposed on the basis of the stiffness condition and a DMA (Dexterity Measure for Assembly) that was previously derived by the authors. Third, the method allows us to evaluate the task-performance of a manipulator (e.g. PUMA 560). Finally, the evaluation results show that the stiffness condition for avoidance of jamming on the chamfer is important in evaluating task-performance of a manipulator for a peg in-hole task.

著者

杉山 将史 池田 啓祐 金田 翼 甲斐 義弘 富塚 誠義

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.856, pp.17-00279-17-00279, 2017 (Released:2017-12-25)

参考文献数

14

被引用文献数

4

---

When developing rehabilitation assist suits, safety consideration for patients is crucial. Computer-aided control techniques can improve their safety. However, when the computer breaks down, the assist suit may be dangerous for the user because of its unintentional motion. Therefore, assist suits with hardware-based safety devices are desired to guarantee safety even when the computers do not operate properly. In this paper, we present a new rehabilitation assist suit equipped with a velocity-based safety device and a torque limiter. The assist suit assists a patient's knee joint. The velocity-based safety device switches off the assist suit's motor if it detects an unexpected high joint angular velocity. The torque limiter cuts off the torque transmission if it detects an unexpected high joint torque. These safety devices will work even when the computer breaks down, because they consist of only passive mechanical components without actuators, controllers, or batteries. Firstly, we describe the features of the assist suit with the safety devices. Secondly, we introduce the structure of the assist suit. Thirdly, we explain the structure and mechanism of the velocity-based safety device. Fourthly, we show the prototype assist suit that we have developed. Finally, we present experimental results to verify the effectiveness of the velocity-based safety device installed on the developed assist suit.