Abstract:This paper presents a hybrid force position control strategy for position-controlled robotic manipulator. On-line force feedback data are employed to estimate the local shape of constraint. The estimated vectors are used to generate the virtual reference trajectory for the target impedance model, which is driven by the force error to produce a command position to the manipulator. By following the commanded position trajectory the robotic manipulator can follow unknown constraint surface while keeping an acceptable force error in a manner depicted by the target impedance model. Computer simulation is conducted to verify its force tracking capability.
1 Cheah C C, Wang D. Learning Impedance Control for Robotic Manipulators. IEEE Trans On Robotics and Automat, 1998,14(3) 2 Seraji H, Colbaugh R. Force Tracking in Impedance Control. The International Journal of Robotics Research, 1997,16(1): 97~117 3 Pelletier M,Doyon M. On the Implementation and Performance of Impedance Control on Position Controlled Robots. Proc IEEE Int Conf Robot Automat, 1994: 1228~1233 4 Yoshikawa T, Sudou, Akio. Dynamic Hybrid Position/force Control of Robot Manipulators: On-line Estimation of Unknown Constraint. Proc IEEE Int Conf Robotic Automat. Publ By IEEE Computer Society, Los Alamitos, CA USA, 1990: 1231~1236 5 Hogan N. Impedance Control: An Approach to Manipulation. Part I-III Trans, ASME J Dynamic System, Meas Contr, 1985,107: 1~24 6 Raibert M H, Craig J J. Hybrid Position/force Control of Manipulators. Trans ASME J Dyn Syst, Meas, Contr, 1981,103: 126~133 7 Blauer M, Belanger P R. State and Parameters Estimation for Robotic Manipulators Using Force Measurements. IEEE Trans, on Automatic Control, 1987 8 Merlet J P. C-surface Applied to the Design of An Hybrid Force/Position Robot Controller. IEEE Conf of RA, 1987:2 9 Craig J J. Introduction to Robotics: Mechanics and Control Silma Inc, 1989