This paper describes the control system for an eight-degree-of-freedom biped robot built at the University of Salford. The controller enables the robot to walk in the sagittal plane on smooth level terrain and is essentially an observer-based controller utilising state feedback, integral action and feedforward control. The robot posture is controlled by selecting constant reference set points for the control system. Locomotion is achieved by suitably modifying the reference set points. The robot walks with a step length of approximately 0.3 m and a speed of about 0.03 m/s.
Ahmadi, M., and Buehler, M.1995. 'A Control Strategy for Stable Passive Running', IROS'95 International Conference on Intelligent Robots and System, Pittsburgh, Pennsylvania, USA, 152-157.
2.
Alexander, R. McN.1990. 'Three Uses for Springs in Legged Locomotion', Int J Robot Res, 9(2), 53-61.
3.
Anderson, B.D.O., and Moore, J.B.1989. Optimal Control: Linear Quadratic Methods, Prentice-Hall, chapters 1, 4, 5 and 8.
4.
Caldwell, D.G., Medrano-Cerda, G.A., and Goodwin, M.1993. 'Braided Pneumatic Actuator Control of a Multi-joint Manipulator' , IEEE Conference onSystems Man and Cybernetics, Le Touquet, France, 423-428.
5.
Caldwell, D.G., Medrano-Cerda, G.A., and Goodwin, M.1994. 'Characteristics and Adaptive Control of Pneumatic Muscle Actuators for a Robotic Elbow', IEEE Conference on Robotics andAutomation, San Diego, USA, 3558-3563.
6.
Caldwell, D.G., Medrane-Cerda, G.A., and Goodwin, M.1995. 'Control of pneumatic muscle actuators', IEEE Control Systems Magazine, 15(1), 40-48.
7.
Caldwell, D.G., Medrano-Cerda, G.A., and Bowler, C.J.1997. 'Investigation of Bipedal Robot Locomotion using Pneumatic Muscle Actuators', IEEE International Conference Robotics andAutomation, Albuquerque, New Mexico, USA, April, Vol1, 799-804.
8.
Channon, P.H., Hopkins, S.H., and Pham, D.T.1992. 'Modelling and control of a bipedal robot', Journal of Systems Engineering, 2, 46-59.
9.
Eldukhri, E.E.1996. 'Design and Control of a Biped Walking Robot', PhD Thesis, Dept Electronic and Electrical Eng, University of Salford, UK.
10.
Inaba, M., Kanehiro, F., Kagami, S., and Inoue, H.1995. 'Two-armed Bipedal Robot that can Walk, Roll Over and Stand Up', IROS'95 International Conference on Intelligent Robots and System, Pittsburgh, Pennsylvania , USA, 297-302.
Medrano-Cerda, G.A., Bowler, C.J., and Caldwev, D.G.1995a. 'Adaptive Position Control of Antagonistic Pneumatic Muscle Actuators', IROS'95 International Conference on Intelligent Robots and Systems, Pittsburgh, Pennsylvania, USA, 378-383.
14.
Medrano-Cerda, G.A., Eldukhri, E.E., and Cetin, M.1995b. 'Balancing and attitude control of double and triple inverted pendulums', Trans Inst Meas Cont, 17(3), 143-154.
15.
Mita, T., Yamaguchi, T., Kashiwase, T., and Kawase, T.1984. 'Realization of a high speed biped using modem control theory', Int J Control, 40(1), 107—119.
16.
Miura, H., and Shimoyama, I.1984. 'Dynamic walk of a robot', Int J Robot Res, 3(2), 64—74.
17.
Nakano, Y., Chono, K., Yoneda, K., and Kameishi, H.1994. 'A Dynamic Biped Walking Robot Based on the Momentum Mechanism with Flexible Beams', IROS'94 International Conference on Intelligent Robots and Systems, Munich, Germany, 1318-1323.
18.
Rad, H., Gregorio, P., and Buehler, M.1993. 'Design, Modelling and Control of a Hopping Robot', IROS'93 International Conference on Intelligent Robots and Systems , Yokohama, Japan, 1778- 1985.
19.
Raibert, M.H.1986. Legged Robots That Balance, MIT Press , Cambridge, Mass.
20.
Takanishi, A., Ishida, M., Yamazaki, Y., and Kato, I.1985. 'The Realization of Dynamic Walking by the Biped Walking Robot WL-10RD', Proc of the 1985ICAR, 459-466.
21.
Takanishi, A., Tochizawa, M., Takeya, T., Kanaki, H., and Kato, I.1990a. 'Realization of Dynamic Biped Walking Stabilized with Trunk Motion Under Known External Force', Scientific Fundamentals of Robotics 7, Springer-Verlag, Berlin, Germany, 299-310.
22.
Takanishi, A., Takeya, T., Karaki, H., and Kato, I.1990b. 'A Control Method for Dynamic Biped Walking under Unknown External Force', in Proc IEEE Int Workshop Intel Robots and Systems '90, Tsuchiura, Ibaraki, Japan, 3-6 July, 795-801.
23.
Virk, G., and Luk, B.L.1996. 'CLAWAR interim report by the University of Portsmouth' , IEE Colloquium on Information Technology for Climbing and Walking Robots, University of Portsmouth, UK.
24.
Vukobratovic, M., Borovac, B., Surla, D., and Stokic, D.1990. Biped Locomotion: Dynamics, Stability, Control and Application, Springer-Verlag, Berlin .
25.
Walker, R.1996. 'Using air muscles for compliant bipedal and many-legged robotics', IEE Colloquium on Information Technology for Climbing and Walking Robots, University of Portsmouth, UK.
26.
Zhang, S.J., Howard, D., Sanger, D.J., and Miao, S.1997. 'Multi-legged walking machine body design', to appear in Robotica.
