Document Type : Research Paper


1 Associate Professor of Industrial Engineering, University of Kashan

2 Department of of Industrial Engineering,, Faculty of Engineering, University of kashan


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 condition


Main Subjects

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