The Squeezing Method : Calculating Capacity Requirements for Finite Capacity Scheduling(<Special English Issue>Global Supply Chain Management)

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  • The squeezing method: calculating capacity requirements for finite capacity scheduling

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Finite Capacity Scheduling(FCS) has a major drawback because it is difficult to calculate the necessary capacity adjustment for each day and for each work center. To overcome this shortcoming, the authors have developed the Squeezing Method. A key element of this method is the compression coefficient. When backward scheduling is used and the start times of orders go back to past dates, the compression coefficient reduces the lead time of the total operation. This "squeezing" is necessary when the arrival work-load level is above a certain amount. The arrival load ratio at which it becomes necessary to compress the lead time to avoid delays is defined in the study as the marginal arrival load ratio. Finally, the authors present an equation for estimating the optimum compression coefficient for a given simulation model. Using the equation, the optimum compression coefficient can be determined and the capacity increase requirements per day and per work center can be calculated.

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