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Abstract

Elasticity in conventionally built walking robots is an undesired side-effect that is suppressed as much as possible because it makes control very hard and thus complex control algorithms must be used. The human motion apparatus, in contrast, shows a very high degree of flexibility with sufficient stability. In this research we investigate how compliance and damping can deliberately be used in humanoid robots to improve walking capabilities. A modular robot system consisting of rigid segments, joint modules and adjustable compliant cables spanning one or two joints is used to configure a human-like biped. In parallel, a simulation model of the robot was developed and analyzed. Walking motion is gained by oscillatory out-of-phase excitations of the hip joints. An optimization of the walking speed has been performed by improving the viscoelastic properties of the leg and identifying the appropriate hip control parameters. A good match was found between real robot experiments and numerical simulations. At higher speeds, transitions from walking to running are found in both the simulation as well as in the robot.

Keywords

locomotion compliant legs walking running control optimization

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References

Abramson, M.A. (2002). Pattern search filter algorithms for mixed variable general constrained optimization problems. Ph.D. Thesis, Rice University.

Blickhan, R. (1989). The spring-mass model for running and hopping . Journal of Biomechanics, 22(11-12): 1217-1227.

Cavagna, G.A. , Saibene, F.P. and Margaria, R. (1964). Mechanical work in running. Journal of Applied Physiology, 19: 249-256.

Honda Motors Co. (2005). New asimo - running at 6km/h, http://world.honda.com/hdtv/asimo/new-asimo-run-6kmh/ .

Collins, S.H. et al. (2005). Efficient bipedal robots based on passive-dynamic walking. Science, 307(5712): 1082-1085.

Geng, T. , Porr, B. and Worgotter, F. (2006). Fast biped walking with a sensor-driven neuronal controller and real-time on-line learning. International Journal of Robotics Research, 25(3): 243-259.

Geyer, H. , Seyfarth, A. and Blickhan, R. (2006). Compliant leg behaviour explains basic dynamics of walking and running. Proceeings of the Royal Society B , 273(1603): 2861- 2867.

Gilmore, P. and Kelley, C. , (1995). An implicit filtering algorithm for optimization of functions with many local minima. SIAM J. Optim. 5, 269-285.

Hirai, K. et al. (1998). The development of honda humanoid robot . Proceedings of the IEEE International Conference on Robotics and Automation (ICRA), pp. 1321-1326.

10.

Iida, F. et al. (2006). Toward a human-like biped robot with compliant legs. Proceedings of Intelligent Autonomous Systems (IAS), Arai, T. et al. (eds). Tokyo, Japan, IOS Press, pp. 820-827.

11.

Iida, F. , Rummel, J. and Seyfarth, A. (2008). Bipedal walking and running with spring-like biarticular muscles. Journal of Biomechanics, 41(3): 656-667.

12.

Ishida, T. , Kuroki, Y. and Yamaguchi, J. (2003). Mechanical system of a small biped entertainment robot. Proceedings of the IEEE/RSJ International Conference on Intell. Rob. Syst. (IROS), Las Vegas, Nevada, pp. 1129-1134.

13.

Kaneko, K. et al. (2004). Humanoid robot HRP-2. Proceedings of the IEEE International Conference on Robotics and Automation (ICRA), pp. 1083-1090.

14.

Loeffler, K. , Gienger, M. and Pfeiffer, F. (2003). Sensors and control concept of walking "Johnnie" . International Journal of Robotics Research, 22(3-4: 229-239.

15.

McGeer, T. (1990). Passive dynamic walking. International Journal of Robotics Research, 9(2): 62-82.

16.

Raibert, M.H. (1986). Legged Robots that Balance. Cam-bridge, MA, MIT Press.

17.

Seyfarth, A. et al. (2002). A movement criterion for running. Journal of Biomechanics, 35(5): 649-655.

18.

Seyfarth, A. et al. (2006). Running and walking with compliant legs . Fast Motions in Biomechanics and Robotics: Optimization and Feedback Control, Diehl, M. and Mombaur, K. (eds). Heidelberg , Springer, pp. 383-402.

19.

Van Ham, R. et al. (2005). MACCEPA: the actuator with adaptable compliance for dynamic walking bipeds. Proceedings of the 8th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines (CLAWAR), Vol. 8, London, UK, pp. 759- 766.

20.

Vanderborght, B. et al. (2004). Control architecture of LUCY, a biped with pneumatic artificial muscles. Proceedings of the 7th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines (CLAWAR), Brussels, Belgium.

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