Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1988-08-26
1989-09-05
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
901 15, 31856818, G05B 1910
Patent
active
048642053
ABSTRACT:
A kinematic method to operate a multi-jointed robot to achieve coordinated, speed-invariant motion when the robot's end effector is moved along a predefined path. To accomplish such operation, a total execution time function is defined which is a function of acceleration time, slew time, and deceleration time for the joints. Values for the acceleration time, slew time, and deceleration time are calculated which minimize the total time function subject to constraints on the displacement, the limiting velocity, the limiting acceleration, and the limiting deceleration for the joints. Then, the end effector of the robot is operated such that all joints start moving at the same instant, all joints accelerate for the same period, all joints slew for the same period, and all joints decelerate for the same period. During such motion, at least one moving joint is responsible for determining the acceleration time, at least one other moving joint (or possibly the same joint) is responsible for determining the deceleration time, and at least one moving joint (or one of the two prior joints) is responsible for determining the slew time. Also during such motion, each moving joint will progress through its motion at the same relative rate; that is, at the time the ith joint completes some percentage of its travel distance, any other moving joint will complete the same percentage of its travel distance.
REFERENCES:
patent: 4488242 (1984-12-01), Tabata et al.
patent: 4547858 (1985-10-01), Horak
patent: 4769583 (1988-09-01), Goor
Introduction to Robotics Mechanics & Control, John J. Craig, 1986, Addison-Wesley Publishing Company, Inc., pp. 191-209, ("Trajectory Generation").
Robot Manipulators: Mathematics, Programming, and Control, Richard P. Paul, MIT Press, 1981, pp. 119-139, ("Motion Trajectories").
K. G. Shin and N. D. McKay, "Minimum-Time Trajectory Planning for Industrial Robots With General Torque Constrains", in International Conference of Robotics and Automation, IEEE Computer Society, 1986, San Francisco, CA.
K. G. Shin and N. D. McKay, "Selection of Near-Minimum Time Geometric Paths for Robotic Manipulators", IEEE Transactions on Automatic Control, vol. AC-31, Jun. 1986.
K. G. Shin and N. D. McKay, "A Dynamic Programming Approach to Trajectory Planning of Robotic Manipulators", IEEE Transactions on Automatic Control, vol. AC-31, Jun. 1986.
K. G. Shin and N. D. McKay, "Minimum-Time Control of Robotic Manipulators With Geometric Path Constrains", IEEE Transactions on Automatic Control, vol. AC-30, Jun. 1985.
V. T. Rajan, "Minimum Time Trajectory Planning", in International Conference of Robotics and Automation, IEEE Computer Society, 1985, St. Louis, Missouri.
G. Sahar and M. J. Hollerbach, "Planning of Minimum-Time Trajectories for Robot Arms", International Journal of Robotics Research, vol. 5, Fall 1984.
M. S. Mujtaba and W. D. Fisher, "Hal, A Work Station Based Intelligent Robot Control Environment", in ROBOTS 11/ISIR 17 Conference, 1987, Chicago, IL.
F. Pfeiffer and R. Johanni, "A Concept for Manipulator Trajectory Planning", IEEE Journal of Robotics and Automation, vol. RA-3, Apr. 1987.
J. Y. S. Luh and M. W. Walker, "Minimum-Time Along the Path for a Mechanical Arm", in Conference on Decision and Control, IEEE Automated Control Society, 1977, New Orleans, LA.
M. S. Mujtaba, "Exploratory Study of Computer Integrated Assembly Systems", Tech. Rep., STAN-CS-76-568, Chapter VIII, Stanford: Computer Science Dept., Jun. 1977.
B. K. Kim and K. G. Shin, "Minimum-Time Path Planning for Robot Arms and Their Dynamics", IEEE Transactions on Systems, Man and Cybernetics, vol. SMC-15, Mar./Apr. 1985.
C. S. Lin and RP. R. Chang, "Approximate Optimum Paths of Robot Manipulators Under Realistic Physical Constrains", in International Conference of Robotics and Automation, IEEE Computer Society, 1985, St. Louis, MO.
H. P. Geering, L. Guzzella, S. A. R. Hepner, and C. H. Onder, "Time-Optimal Motions of Robots in Assembly Tasks", IEEE Transactions on Automatic Control, vol. AC-31, Jun. 1986.
M. E. Kahn, "The Near-Minimum-Time Control of Open-Loop Articulated Kinematic Chains", Tech. Rep., AIM 106, Stanford: Stanford Artificial Intelligence Lab, Dec. 1969.
J. E. Bobrow, S. Dubowsky, and J. S. Gibson, "Time-Optimal Control of Robotic Manipulators", International Jountal of Robotics Research, vol. 4, Fall 1985.
R. H. Castain and R. P. Paul, "An On-Line Dynamic Trajectory Generator", International Journal of Robotics Research, vol. 3, Spring 1984.
Fisher William D.
Mujtaba M. Shahid
Bergmann Saul M.
Hewlett--Packard Company
Shoop Jr. William M.
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