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From time-optimal schedule to robust event-based control

Nina Sundström (Institutionen för signaler och system, Automation) ; Bengt Lennartson (Institutionen för signaler och system, Automation)
20th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2015, Luxembourg, 8-11 September 2015 (1946-0740). (2015)
[Konferensbidrag, refereegranskat]

In this work in progress paper, we formulate performance robust event-based control strategies with respect to uncertainties in operation processing times. The proposed policies are based on a time-optimal schedule of operation sequences. A logical operation model is used to specify relations between operations. The control policies generate conditions ensuring to maintain the execution order given in the schedule. One of the strategies is less restrictive in order to avoid unnecessary delays due to uncertainties in execution times. In this case, the generated conditions are evaluated and, if possible, relaxed for operations without a logical connection. For non-nominal execution times, the makespan of the less restrictive control policy is proven to always be better or equal to the makespan of the more restrictive control strategy.

Nyckelord: Job shop scheduling, Optimal scheduling, Process control, Robots, Robustness, Schedules, Uncertainty



Denna post skapades 2016-01-15. Senast ändrad 2016-08-17.
CPL Pubid: 230736

 

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Institutioner (Chalmers)

Institutionen för signaler och system, Automation

Ämnesområden

Robotteknik och automation

Chalmers infrastruktur