O-GERT MODELİNG AND ANALYSIS IN A PRODUCTION PLANNING AND SCHEDULING

The purpose of this paper is to present an application of QGERT network model oriented production planning and scheduling of a manufacturing company. I n this model, the routings of the items are modeled by inserting user functions into the model. Therefore, network model of a complex routing situation has been simplified by eliminating conditional branches used to schedule routings of the items. Development of the Q-GERT ne"twork model was based on utillzation of actual data and providing the desired outputs, This model has been anaysed by Q-GERT Analysis Program supplied with user subroutines and functions. Three majör objectives are considered for this network model development: 1. Determination of the system configuration. 2. Selection of priorlty rule to meet orders on time. 3. Specification of the manufacturing scheduling. Alternative decisions have been evaluated on this model to realize the objectives given above. Besides, the following Information requested by management have been obtained:1. Daily reports of order situation 2. Monthly reports of work station situation I n this paper, firstly the structure of the system will be introduced and then Q-GERT model w i l l be reviewed. The paper concludes with some discussions on the simulation results of network analysis.