Inorga scheduling system

Abstract

Alot of systems have been developed in scheduling of piece and small batch production, one of them at Inorga Institute in Prague. This system consists of three relatively independent levels, each of which can be used separately. The orders for final products are planned in Rough Scheduling, which represents the highest level in our scheduling hierarchy. The most important condition for a feasible schedule is to accept all due-dates, the optimality criterion is to minimize differences between capacity needs and requirements for all products, capacities and time periods. A similar approach is used for the lower scheduling level, i.e. for Fine Scheduling. Batches of parts are planned here for groups of machines on workshop levels. Feasible solution and optimality criterion are the same as above. The lowest scheduling level, Dynamic Rescheduling, is concerned with single machines and single operations. The purpose is to sequence operations for each working place with respect to various conditions and criterions occurring most in a fuzzy environment. To meet all needs a system of weights and priorities based on hierarchical structures has been developed.