Planning Multi-Stage Rework Production System Considering Energy Consumption

Today, in order to maximize the productivity, sales and profits of factories, various factors must be considered. One of these factors is energy saving, which leads to success in any businesses. Another important factor is rework in the production process, which reduces waste and optimal use of resources. In this research, a linear mathematical programming model has been developed for a multi-stage production system considering energy consumption and the possibility of rework. The objective function of the model is calculated from a combination of energy costs and raw material costs, and the proposed model has three categories of balance constraints, demand constraints and time constraints. The balance constraints, the task of calculating the number of raw materials required and the amount of input materials to each part of the production stage, the demand constraints are the task of calculating the number of final products, and the inventory and time constraints are also the task of calculating the time available to the production of each product. A hypothetical production system is flow shop. To understand the proposed model better, a logical example is designed and solved and analyzed using GAMS software . In the current situation , energy consumption is one of the concerns of policy make rs in the fields of production and industry , and therefore this research with the propo sed model , helps decision makers in manufacturing industries to ensure optimal ene rgy consumption , optimal decisions in adopt multi - stage rework and production conditions .