Generation of restart states for manufacturing systems with discarded workpieces

Andersson, Kristin,1976Chalmers tekniska högskola,Chalmers University of Technology (author)

In earlier work we presented a method for restart of manufacturing systems. After correction of an error, the system resumes normal production by returning to a certain restart state in the control function, and from there reexecutes parts of the work schedule. In the present paper the method is extended to handle also systems where some, but not necessarily all, workpieces are discarded during the error correction preceding the restart. The restart process must then replace the discarded workpieces with new ones. The workpieces that remain in the cell may limit the possibilities of executing certain operations needed to process the new workpieces correctly, thus complicating the restart. Properties of the restart states that guarantee a correct restart are defined, typical situations that make the system impossible to restart are presented, and some suggestions are given for modifications that make the system restartable.

Lennartson, Bengt,1956Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)l (author)
Falkman, Petter,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)pf (author)
Fabian, Martin,1960Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fabian (author)
Chalmers tekniska högskola (creator_code:org_t)

In:2009 IEEE Conference on Automation Science and Engineering, CASE 2009, Bangalore, India, s. 191-1969781424445783

By the author/editor: Andersson, Krist ...; Lennartson, Beng ...; Falkman, Petter, ...; Fabian, Martin, ...

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