Lifting Objects with Power-Assist: Weight-Perception-Based Force Control Concepts to Improve Maneuverability

Abstract:

We developed a 1-DOF power assist robot system to lift objects of different sizes by human subjects. We adopted a hypothesis that weight perception due to inertia might be different from that due to gravity when lifting an object with a power assist robot because the human feels a difference between the actual weight and the perceived weight of the object. We included this hypothesis in the robot dynamics. We then discussed the suitability of force control for the robot for lifting objects and developed several weight-perception-based force control strategies. These force control strategies may be compared to previously developed position control strategies, and the comparison results may help determine appropriate control for the robot to achieve desired maneuverability. The results, as a whole, may help develop human-friendly power assist devices to handle heavy objects in various industries.

• Periodical: Advanced Engineering Forum (Volumes 2-3)
• Pages: 277-280
• DOI: https://doi.org/10.4028/www.scientific.net/AEF.2-3.277
• Online since: December 2011
• Authors: S.M. Mizanoor Rahman, Ryojun Ikeura, Soichiro Hayakawa, Hao Yong Yu
• Keywords: Force Control, Human, Industry, Lifting Objects, Maneuverability, Position Control, Power Assist Robot, Safe Human-Robot Interaction, Weight Perception

References

[1] H. Seki, K. Ishihara and S. Tadakuma, "Novel regenerative braking control of electric power-assisted wheelchair for safety downhill road driving," IEEE Trans. on Industrial Electronics, Vol. 56, No. 5,2009, pp.1393-1400.

DOI: 10.1109/tie.2009.2014747

[2] S. Tashiro and T. Murakami, "Step passage control of a power-assisted wheelchair for a caregiver," IEEE Trans. on Industrial Electronics, Vol. 55, No. 4, April 2008, pp.1715-1721.

DOI: 10.1109/tie.2008.917061

[3] S.M.M. Rahman, R. Ikeura, M. Nobe, S. Hayakawa, H. Sawai, "Weight-perception-based model of power assist system for lifting objects," Int. Journal of Automation Technology, Vol.3, No.6, pp.681-691, Nov 2009.

DOI: 10.20965/ijat.2009.p0681

[4] T.Doi, H.  Yamada, T.  Ikemoto, and H. Naratani, "Simulation of a pneumatic hand crane power-assist system," Journal of Robotics and Mechatronics, Vol.20, No.6, 2008, pp.896-902.

DOI: 10.1109/sice.2007.4421376

[5] A. Niinuma, T.Miyoshi, K. Terashima, Y. Miyashita, "Evaluation of effectiveness of a power-assisted wire suspension system compared to conventional machine," in Proc. of 2009 IEEE Int. Conf. on Mechatronics and Automation, Aug. 9-12, 2009, pp.369-374.

DOI: 10.1109/icma.2009.5246728

[6] S.M.M. Rahman, R. Ikeura, H. Sawai, "Design and control of a power-assist robot system for lifting objects based on human's unimanual and bimanual weight discrimination," International Journal of Assistive Robotics and Systems,Vol.11, No.2, pp.11-29, June 2010.

DOI: 10.1109/icma.2009.5246450

[7] S.M.M. Rahman, R. Ikeura, S. Hayakawa, and H. Sawai, "Design guidelines for power assist robots for lifting heavy objects considering weight perception, grasp differences and worst-cases," International Journal of Mechatronics and Automation, Vol. 1, No. 1, p.46–59, March 2011.

DOI: 10.1504/ijma.2011.039155

[8] S.M.M. Rahman, R. Ikeura, S. Hayakawa, H. Sawai, "Design and control of a power assist system for lifting objects based on human operator's weight perception and load force characteristics," IEEE Transactions on Industrial Electronics, Vol.58, No.8,pp.3141-3150, August 2011.

DOI: 10.1109/tie.2010.2087291

[9] S.M.M. Rahman, R. Ikeura, M. Nobe, H. Sawai, "Study on optimum maneuverability in horizontal manipulation of objects with power-assist based on weight perception," in Proceedings of SPIE, Vol. 7500, 75000P (2010).

DOI: 10.1117/12.858442