AVOIDANCE OF SYSTEM DEADLOCKS IN REAL TIME CONTROL OF FLEXIBLE MANUFACTURING SYSTEMS By Richard A. Wysk.

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Presentation transcript:

AVOIDANCE OF SYSTEM DEADLOCKS IN REAL TIME CONTROL OF FLEXIBLE MANUFACTURING SYSTEMS By Richard A. Wysk

PRESENTATION OUTLINE 1. Introduction to System Deadlock 2. The Detection System 3. The Control System 4. Permanent Blocking 5. Simulation Results 6. Conclusions

DIRECT ADDRESS TYPE OF SYSTEMS

SOME BASIC PATTERNS OF SYSTEM DEADLOCKS

THE EFFECT OF A SYSTEM DEADLOCK

WAIT RELATION If a part P is currently at machining resource, Ri, and its next destination is machine Rj. This situation is referred to as a wait relation.

RESOLUTION ALTERNATIVES

THE DETECTION SYSTEM

THE DETECTION SYSTEM

STRING MULTIPLICATION

INTERACTION BETWEEN CLOSED CIRCUITS

THIRD LEVEL CLOSED CIRCUITS

Machine Utilization of the Three Control Methods