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Efficient scheduling algorithms for robot inverse dynamics computation on a multiprocessor system

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3 Author(s)
Chun Chen ; Dept. of Electr. Eng., Purdue Univ., Indianapolis, IN, USA ; Lee, C.S.G. ; Hou, E.S.H.

The problem of scheduling the robot inverse dynamics computation consisting of m computational modules to be executed on a multiprocessor system consisting of p identical homogeneous processors to achieve a minimum-schedule length is examined. This scheduling problem is known to be NP-complete. To achieve the minimum computation time, the Newton-Euler equations of motion are expressed in the homogeneous linear recurrence form that results in achieving maximum parallelism. To speed up the searching for a solution, a heuristic search algorithm called dynamical highest-level-first/most-immediate-successors-first (DHLF/MISF) is proposed to find a fast but suboptimal schedule. For an optimal schedule the minimum-schedule-length problem can be solved by a state-space search method, the A* algorithm coupled with an efficient heuristic function derived from the Fernandez and Bussell bound

Published in:

Systems, Man and Cybernetics, IEEE Transactions on  (Volume:18 ,  Issue: 5 )

Date of Publication:

Sep/Oct 1988

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