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Consequently, a multi-objective dynamic cell formation problem is presented in this paper, where the total cell load variation and sum of the miscellaneous costs (machine cost, inter-cell material handling cost, and machine relocation cost) are to be minimized simultaneously.
Equation (1.2) calculates the machine relocation cost between cells, whereas machine relocation cost between cells and setup area is calculated by Eq. (1.3).
Total machine relocation cost for considered planning periods is calculated by Eq. (1.1).
In the mathematical model development, summation of costs for above two relocations is referred as total machine relocation cost.
Objective function seeks to minimize the summation of total machine relocation cost, machine setup cost and inter-cell material handling cost.
The objective function seeks to minimize eight cost functions namely; holding cost, backorder cost, inter-cell material handling cost, maintenance and overhead cost of machines, machine relocation cost, salary cost, hiring cost and firing cost.
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Machine relocation costs.
Therefore, other than the machine relocation costs, any physical reconfiguration costs (i.e., changes in lighting and ventilation systems) are not allowed.
Dynamic virtual cell formation (DVCF), unlike conventional dynamic manufacturing systems, can be utilized in this reGArd while reducing some costs, such as actual machine relocation costs.
This paper presents a mathematical programming model for dynamic cell formation to minimize changeover-related costs (i.e., machine relocation costs and machine setup cost) and inter-cell material handling cost to cope with the volatile production environments in apparel manufacturing industry.
By taking the linear intra-cell machines layout, operation sequence, processing times and the machines capacity into account, the model intended to minimize the intra/inter-cell movements costs, the machines overhead costs and machines relocation costs.
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machine relocation cell
machine relocation policy
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machine idleness cost
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machine relocation distance
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machine health cost
machine relocation material
machine operating cost
machine breakdown cost
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