Design of a power assist system for lifting objects based on human's weight perception and changes in system's time constant

In this paper, we designed a simple 1 DOF power assist system for lifting objects based on human's perception of object weight. We hypothesized that, human's perception of weight due to inertial force might be different from the perceived weight due to gravitational force. We then compared human's load force rates for lifting objects manually with that for lifting objects with the power assist system. We found the load force rates much lower for the power assisted objects. We then hypothesized whether or not mechanical time constant of the power assist system is a factor that reduces heaviness of objects lifted with it. The results show that, higher mechanical time constant lowers the perceived heaviness as well as peak load forces. Uses of the findings in design of power assist robots for lifting heavy objects in industries may improve interactions with humans.

[1]  Miles C. Bowman,et al.  Control strategies in object manipulation tasks , 2006, Current Opinion in Neurobiology.

[2]  D. W. Joyce,et al.  Kinematic cues in perceptual weight judgement and their origins in box lifting , 2007, Psychological research.

[3]  Vladimir M. Zatsiorsky,et al.  Motor control goes beyond physics: differential effects of gravity and inertia on finger forces during manipulation of hand-held objects , 2005, Experimental Brain Research.

[4]  H. Yamada,et al.  Simulation of pneumatic hand crane type power assist system , 2007, SICE Annual Conference 2007.

[5]  J. Flanagan,et al.  Independence of perceptual and sensorimotor predictions in the size–weight illusion , 2000, Nature Neuroscience.

[6]  Homayoon Kazerooni,et al.  Exoskeletons for human power augmentation , 2005, 2005 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[7]  Kazuo Tanie,et al.  Assist system for carrying a long object with a human-analysis of a human cooperative behavior in the vertical direction , 1999, Proceedings 1999 IEEE/RSJ International Conference on Intelligent Robots and Systems. Human and Environment Friendly Robots with High Intelligence and Emotional Quotients (Cat. No.99CH36289).

[8]  Kazuo Tanie,et al.  Human-Robot Cooperative Manipulation Using a Virtual Nonholonomic Constraint , 2002, Int. J. Robotics Res..

[9]  Eric L. Amazeen,et al.  The Role of Rotational Inertia in the Haptic and Haptic + Visual Size-Weight Illusions , 2003 .

[10]  R. Johansson,et al.  Visual size cues in the programming of manipulative forces during precision grip , 2004, Experimental Brain Research.

[11]  R. Ikeura,et al.  Human Operator's Weight Perception of an Object Vertically Lifted with a Power Assist System , 2008, 2008 IEEE/SICE International Symposium on System Integration.

[12]  Holly A. Yanco,et al.  Classifying human-robot interaction: an updated taxonomy , 2004, 2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583).

[13]  Kazuhiko Terashima,et al.  Development of vertical power-assisted crane system to reduce the operators' burden , 2004, 2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583).

[14]  Jenq-Shyong Chen,et al.  Mechanical model and contouring analysis of high-speed ball-screw drive systems with compliance effect , 2004 .

[15]  Kazuhiko Terashima,et al.  Fuzzy power assist control system for omni-directional transport wheelchair , 2004, 2004 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) (IEEE Cat. No.04CH37566).

[16]  Ryojun Ikeura,et al.  Investigation of the Impedance Characteristic of Human Arm for Development of Robots to Cooperate with Humans , 2002 .

[17]  Catherina Burghart,et al.  Concept for Human Robot Co-operation Integrating Artificial Haptic Perception , 2002 .

[18]  Ralf Koeppe,et al.  Robot-Robot and Human-Robot Cooperation in Commercial Robotics Applications , 2003, ISRR.

[19]  Homayoon Kazerooni.  Stability and performance of robotic systems worn by humans , 1990, Proceedings., IEEE International Conference on Robotics and Automation.

[20]  Hikaru Inooka,et al.  Evaluating the maneuverability of a control stick using electromyography , 2004, Biological Cybernetics.

[21]  Kazuhiro Kosuge,et al.  Force Assistance System for Standing-Up Motion , 2006, ICMA 2006.

[22]  Kazuo Tanie,et al.  Control of mobile manipulators for power assist systems , 1999, IEEE SMC'99 Conference Proceedings. 1999 IEEE International Conference on Systems, Man, and Cybernetics (Cat. No.99CH37028).

[23]  K. Kiguchi.  Actuated artificial joints for human motion assist - an inner skeleton robots , 2004, IEEE Conference on Robotics and Automation, 2004. TExCRA Technical Exhibition Based..

[24]  Homayoon Kazerooni,et al.  Industrial-strength human-assisted walking robots , 2001, IEEE Robotics Autom. Mag..

[25]  R. Johansson,et al.  Integration of sensory information during the programming of precision grip: comments on the contributions of size cues , 2004, Experimental Brain Research.

[26]  H. Kazerooni,et al.  Extender: a case study for human-robot interaction via transfer of power and information signals , 1993, Proceedings of 1993 2nd IEEE International Workshop on Robot and Human Communication.

[27]  T. Noritsugu,et al.  Development of wearable power assist device constructed with pneumatic artificial rubber muscle , 2004, IEEE Conference on Robotics and Automation, 2004. TExCRA Technical Exhibition Based..