System for determining array sequence of plurality of processing operations

A method for providing a service for determining an array sequence of a plurality of processing operations each of which processes a plurality of steel plates, wherein

• a first sequence constraint based on a first attribute of each of the plurality of processing operations and a second sequence constraint based on a second attribute of each of the plurality of the processing operations are defined between each of the processing operations and each of the other processing operations;
• and
• the method comprises the steps of:
• implementing a system including,
• a classifying section classifying the plurality of processing operations into a plurality of clusters based on attribute values of the first attribute, and arranging the processing operations included in each of the clusters in a sequence satisfying the second sequence constraint within a cluster,
• a rough-scheduling section regarding the first sequence constraint as a constraint between the plurality of clusters, and arranging the plurality of clusters in a sequence maximizing the efficiency of steel plate processing,
• a judging section judging whether the second sequence constraint is satisfied between the last processing operation in a first cluster and the first processing operation in a second cluster arranged next to the first cluster, and
• a detail-scheduling section which, on condition that the second sequence constraint is not satisfied, searches for another processing operation satisfying the second sequence constraint with each of a last processing operation in the first cluster and a first processing operation in the second cluster, and which arranges said another processing operation next to the first cluster and before the second cluster;
• and
• changing at least one of the first sequence constraint, the second sequence constraint, and the objective function.