Control of multiple robots presents numerous challenges, some of which include synchronization in terms of position, motion, force, load sharing and internal force minimization. This paper presents formulation and application of a fuzzy logic based strategy for control of two 6 degree-of-freedom robots carrying an object in a cooperative mode. The paper focuses on control of internal forces that get generated when two or more robots carry an object in coordination. Force/torque (F/T) sensors mounted on wrist of each robot provide the force and torque data in six dimensions. A fuzzy logic controller has been designed to use these force/torque (F/T) data to achieve a cooperating movement in which one robot acts as leader and the other robot follows. The paper also deals with estimation of external forces acting on end effector with the use of data provided by F/T sensors. These external forces and moments are not directly measured by F/T sensor since the quantities measured by F/T sensor are corrupted by the dynamics of the end effector and manipulator (a F/T sensor is usually mounted between wrist and end effector of the robot). This paper investigates the use of Kalman filtering technique to extract the external forces acting on robot end effector utilizing the underlying dynamics of the end effector. Matlab’s Fuzzy logic, Simulink, and State Flow toolboxes are used for achieving real-time, autonomous and intelligent behavior of the two robots. Simulation results from two separate experiments show that the above strategy was able to constrain the internal forces and provide a smooth movement of the manipulators.
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June 2004
Technical Papers
Sensor-Based Estimation and Control of Forces and Moments in Multiple Cooperative Robots
Manish Kumar, Research Assistant,,
Manish Kumar, Research Assistant,
Dept. of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708
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Devendra P. Garg, Professor and ASME Life Fellow,
Devendra P. Garg, Professor and ASME Life Fellow,
Dept. of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708
Search for other works by this author on:
Manish Kumar, Research Assistant,
Dept. of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708
Devendra P. Garg, Professor and ASME Life Fellow,
Dept. of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708
Contributed by the Dynamic Systems, Measurement, and Control Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the ASME Dynamic Systems and Control Division July 8, 2003; final revision, November 14, 2003. Associate Editor: R. Gao.
J. Dyn. Sys., Meas., Control. Jun 2004, 126(2): 276-283 (8 pages)
Published Online: August 5, 2004
Article history
Received:
July 8, 2003
Revised:
November 14, 2003
Online:
August 5, 2004
Citation
Kumar, M., and Garg, D. P. (August 5, 2004). "Sensor-Based Estimation and Control of Forces and Moments in Multiple Cooperative Robots ." ASME. J. Dyn. Sys., Meas., Control. June 2004; 126(2): 276–283. https://doi.org/10.1115/1.1766029
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