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Scheduling in dual gripper robotic cells for productivity gains

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3 Author(s)
Sethi, S.P. ; Texas Univ., Dallas, TX, USA ; Sidney, J.B. ; Sriskandarajah, C.

We consider single part-type problems. Since all parts produced are identical, it is sufficient to determine the sequence of moves performed by the robot. The processing constraints define the cell to be a flowshop. The objective is the minimization of the steady-state cycle time to produce a part, or equivalently the maximization of the throughput rate. We study the problem of scheduling robot moves in dual gripper robot cells functioning in a bufferless environment. We develop an analytical framework for studying dual gripper robotic cells and examine the cycle time advantage of using a dual gripper rather than a single gripper robot. It is shown that an m-machine dual gripper robot cell can have at most double the productivity of its single gripper counterpart. We also propose a practical heuristic algorithm to compare productivity for given cell data. Computational testing of the algorithm on realistic problem instances is also described

Published in:

Robotics and Automation, IEEE Transactions on  (Volume:17 ,  Issue: 3 )

Date of Publication:

Jun 2001

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