著者

江村 超 玄 相昊

出版者

The Robotics Society of Japan

雑誌

日本ロボット学会誌 (ISSN:02891824)

巻号頁・発行日

vol.23, no.4, pp.418-421, 2005-05-15 (Released:2010-08-25)

参考文献数

9

著者

玄 相昊

出版者

一般社団法人 日本ロボット学会

雑誌

日本ロボット学会誌 (ISSN:02891824)

巻号頁・発行日

vol.37, no.2, pp.150-155, 2019 (Released:2019-03-20)

参考文献数

22

著者

赤間 一太 谷口 友美 玄 相昊

出版者

一般社団法人 日本ロボット学会

雑誌

日本ロボット学会誌 (ISSN:02891824)

巻号頁・発行日

vol.39, no.4, pp.375-378, 2021 (Released:2021-05-25)

参考文献数

12

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Water-hydraulic system is environmentally friendly technology, and its application to robot manipulators is eagerly awaited. However, they are still expensive compared to oil-hydraulic systems because of the technical problems related to fast sliding motions between the solid materials contacting each other with the very small gap in the pumps or valves. To avoid these difficulties, we proposed an alternative solution, which lead to a pump-less hydraulic system called AHSB. The system utilizes an air-hydraulic booster to control the low-to-middle range water pressure by pneumatic servo valves. In this paper, we analyze the water-hydraulic dynamics and develop a robust pressure-based joint torque controller using Sliding Mode Control. The controller is implemented on a single-axis robot arm for the remote torque control application, which is crucially important for future tele-operated field robots. The experiments under quasi-static condition demonstrates the first successful torque control results on the water-driven robot with 10 kg payload, which is connected with 20 meter-long hydraulic hoses.

著者

平山 健太 廣澤 望 玄 相昊

出版者

一般社団法人 日本ロボット学会

雑誌

日本ロボット学会誌 (ISSN:02891824)

巻号頁・発行日

vol.38, no.1, pp.104-112, 2020 (Released:2020-01-16)

参考文献数

17

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This paper presents the application of our passivity-based whole-body contact force control framework to compliant walking. We experimentally evaluate the performance of the controller using our original torque-controllable hydraulic humanoid robot, TaeMu. The experiments are performed on the postural stabilization against support space tilt disturbance and walking on the uneven and unstable ground. Instead of limiting the walking speed slow, we address the terrain adaptability of the proposed robot system and algorithm. For that purpose, prior terrain information and environment perception are not given to the controller. The desired motion trajectories are given in advance on the assumption of the ground to be flat. Nevertheless, the robot was able to compliantly keep its posture, compliantly walk on small steps and on an unstable rocker board laid lengthways or crossways. The results demonstrate the effectiveness of the proposed controller as well as the robotic hardware.

著者

江村 超 玄 相昊

出版者

一般社団法人 日本ロボット学会

雑誌

日本ロボット学会誌 = Journal of Robotics Society of Japan (ISSN:02891824)

巻号頁・発行日

vol.23, no.4, pp.418-421, 2005-05-15

参考文献数

9

被引用文献数

1

著者

玄 相昊 上條 敏 美多 勉

出版者

The Robotics Society of Japan

雑誌

日本ロボット学会誌 (ISSN:02891824)

巻号頁・発行日

vol.20, no.4, pp.453-462, 2002-05-15

参考文献数

31

被引用文献数

10 11

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As many biomechanists indicate, tendon plays important role for running or jumping motion. It stores the kinetic energy as a potential energy during stance and also absorbs the impulse at touch down. Inspired by such biomechanical studies, we propose a new simple mechanical model for hindlimb of a dog to realize a robot which imitates dog running, and the hardware design of one-legged running robot, "Kenken" The robot has an articulated leg and uses two hydraulic actuators as muscles and a tensile spring as a tendon. Using an empirical controller based on the characteristic dynamics of the model, the robot has succeeded in planar one-legged running. Although the problem related to the stability at the higher running speed remains, the experimental results demonstrate that the proposed leg mechanism is effective for robotic running.

著者

山口 仁一 玄 相昊 西野 大助 井上 貞敏 曽我 英司 高西 淳夫

出版者

バイオメカニズム学会

雑誌

バイオメカニズム (ISSN:13487116)

巻号頁・発行日

vol.14, pp.261-271, 1998-11-25 (Released:2016-12-05)

参考文献数

18

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Many groups are researching a biped walking robot, although they have different objectives in mind such as applications of modern control theory, the study of mechanisms, or practical use to medical fields. The authors and others are engaged in studies of biped walking robots, with "human form" as a key word, from two points of view: one is human engineering, and the other is toward the development of anthropomorphic robots. The authors and others have obtained the following results to date. In 1984, the authors and others succeeded in achieving a dynamic biped walking of 1.3 [s/step] by the use of a hydraulic biped walking robot, WL-10 RD (Waseda Leg-No.10 Refined Dynamic). From 1986 to 1994, the authors developed hydraulic biped walking robots of the WL-12 series that compensated for lower limbs moment using an upper body and realized not only fast dynamic biped walking (0.54 [s/step] with a step length 0.3 [m]) but also walking on an unknown surface. In 1995, the authors developed an electrical powered biped walking robot WL-13, in which each leg joint is driven antagonistically via a rotary-type, nonlinear spring mechanism, and realized quasi-dynamic walking (7.68 [s/step] with a 0.1 [m] step length). In the current research concerning a biped walking robot, however, there is no developed example of a life-size biped walking robot which can perform manipulation and locomotion by dynamically coordinating arms and legs. Therefore, the authors proposed the construction of a biped humanoid robot that has a hand-arm system, a head system with visual sensors, and antagonistic driven joints using a rotary-type non-linear spring mechanism, on the basis of WL-13. We designed and built it. In addition, as the first step to realize the dynamically coordinated motion of limbs and trunk, the authors developed a control algorithm and a simulation program that generates the trunk trajectory for a stable biped walking pattern even if the trajectories of upper and lower limbs are arbitrarily set for locomotion and manipulation respectively. Using this preset walking pattern with variable muscle tension references corresponding to swing phase and stance phase, the authors performed walking experiments of dynamic walking forward and backward, dynamic dance and carrying, on a flat level surface (1.28 [s/step] with a 0.15 [m] step length). As a result, the efficiency of our walking control algorithm and robot system was proven. In this paper, the mechanism of WABIAN and its control method are introduced.