Development of Sensor-Less Power-Assisted System with Disturbance Observer Considering High Friction
Takanori Miyoshi*, Ryosuke Imai**, Kazuhiko Terashima*,
and Kanemitsu Ochiai***
*Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi city, Aichi, Japan
**SEIKO EPSON Corp., 6925 Toyoshinatazawa, Azumino city, Nagano, Japan
***Ochiai Nexus Corp., 1-1 Miyama, Shinpukuji-cho, Okazaki city, Aichi, Japan
Japan has a dwindling birthrate and a rapidly aging population, which has led to an increasing number of elderly laborers. Although this has spurred development into power-assisted (PA) equipment that can reduce the physical demands, most of power assisted systems developed so far have used the force sensor, a direct drive motor, or a high power motor. The PA machine using force sensor is unable to detect and avoid obstacles that might collide with nonsensor components of the machine. The direct drive motor is too expensive for the practical use and its power tends to increase. According to Japanese law, a high power motor is not allowed to cooperate together with laborers in the factory. Thus, in this research, a sensor-less power-assisted (PA) system capable of estimating operator force based on a disturbance observer and friction correction is designed and built for a high friction production support device using a lowcapacity servo motor and a high-speed reduction ratio reducer. First, a dynamic model of a production support device is identified with specific friction parameters. Next, a sensor-less PA system is constructed that is equipped with an appropriate disturbance observer and dynamic friction correction. Moreover, the static friction issues are solved by the regular driving command. Finally, the accuracies of estimated force are examined, and the effectiveness of the constructed sensor-less PA system is verified.
and Kanemitsu Ochiai, “Development of Sensor-Less Power-Assisted System with Disturbance Observer Considering High Friction,” J. Robot. Mechatron., Vol.25, No.6, pp. 1020-1028, 2013.
-  Annual Report on Health, “Labor and Welfare 2012,” Ministry of Health, Labour and Welfare, 2012.
-  T.Miyoshi and K. Terashima, “Control of power-assisted crane system using direct manual manipulation,” Proc. of IEEE Int. Conf. on Control Applications (CCA), Vol.1, pp. 38-44, 2004.
-  H. Kato, R. Ikeura, H. Nakamura, and K. Mizutani, “Impedance Control for a Power Assist Device and Parameter Estimation,” Proc. of Conf. on JSME Tokai branch, pp. 156-157, 2003.
-  T. Tsumugiwa, R. Yokogawa, and K. Yoshida, “Stability analysis for impedance control of robot for human-robot cooperative task system,” Int. Conf. on Intelligent Robots and Systems (IROS), Vol.4, pp. 3883-3888, 2004.
-  Y. Yamada, H. Konosu, T. Morizono, and Y. Umetani, “Proposal of Skill-Assist: a system of assisting human workers by reflecting their skills in positioning tasks,” Int. Conf. on Systems, Man, and Cybernetics (SMC), Vol.4, pp. 11-16, 1999.
-  H. Konosu, I. Araki, and Y. Yamada, “Practical Development of Skill-Assist,” J. of Robotics Society of Japan, Vol.22, No.4, pp. 508-514, 2004.
-  H. Murayama, K. Fujiwara, N. Takesue, F. Suzuki, A. Shibata, H. Konosu, K. Matsumoto, and H. Fujimoto, “A car window installation assist robot,” J. of Robotics Society of Japan, Vol.30, No.1, pp. 45-46, 2012.
-  N. Takesue, R. Kikuuwe, A. Sano, H. Mochiyama, H. Sawada, and H. Fujimoto, “Force-Dependent Variable Damping Control for Positioning Task Assist,” J. of Robotics Society of Japan, Vol.25, No.2, pp. 306-313, 2007.
-  M. Nakano, T. Tanaka, S. Kaneko, K. Yamano, H. Oyama, S. Seki, and N. Sakamoto, “Improving Maneuverability of Powered Cock for Fire Engine Based on Predicting Its Opening and Closing Time Period,” Proc. of 2008 JSME Conf. on Robotics and Mechatronics, 1A1-G12, 2008.
-  I. Awaya, Y. Kato, I. Miyake, and M. Itoh, “Torque Bias Compensation Method for Nonlinear Friction by the Use of a Disturbance Observer,” Trans. of the Japan Society of Mechanical Engineers, Series (C), Vol.57, No.534, pp. 371-376, 1991.
-  C. Yongyai, A. Shaimada, and K. Sonoda, “Tilting control based motion control on inverted pendulum robots with disturbance observer,” Int. Conf. on Advanced Intelligent Mechatronics (AIM), pp. 1545-1550, 2009.
-  O. Sehoon and Y. Hori, “Generalized discussion on design of forcesensor-less Power Assist Control,” Int.Workshop on Advanced Motion Control (AMC), pp. 492-497, 2008.
-  H. Seki, M. Iso, and Y. Hori, “How to design force sensorless power assist robot considering environmental characteristics-position control based or force control based,” Annual Conf. of Industrial Electronics Society (IECON), Vol.3, pp. 2255-2260, 2002.
-  N. P. Hoang and Y. Takahashi, “Yokoyama M., Control for Power Assist Systems without Torque Sensor,” Proc. of JACC (Jidou Seigyo Rengou Kouenkai, Vol.50, pp. 110-115, 2007.
-  C. Ebisu, R. Ikeura, Y. Shirakawa, K. Mizutani, H. Nakamura, and T. Honda, “Study on the optimum mass value decision of power assist device for industry,” Proc. of 2007 JSME Conf. on Robotics and Mechatronics, 1A2-F08, 2007.
-  S. L. Ipri and H. Asada, “Tuned dither for friction suppression during force-guided robotic assembly,” Proc. on IEEE/RSJ Int. Conf. on Intelligent Robots and Systems (IROS’95), Vol.1, pp. 310-315, 1995.
-  A. Niinuma, T. Miyoshi, Y. Miyashita, and K. Terashima, “Evaluation of Effectiveness between Power-Assisted Wire Suspension System and Conventional Machine,” Proc. of the 2009 IEEE Int. Conf. on Mechatronics and Automation (IEEE ICMA 2009), pp. 369-374, 2009.
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