Commonality, or the use of the same components among products in a product family, has been considered an effective approach to design a product family. By implementing commonality, a firm can reduce the number of distinct components, component inventory, and inventory cost. However, product design may change and product cost may increase due to using common components that may require different interface conditions and be more expensive than the initially considered components. While the benefits and challenges are well recognized, simultaneous optimization of commonality, product family design, and inventory decisions has not been comprehensively studied. In this paper, we present an approach to integrate commonality, product family design, and inventory decisions by incorporating inventory-related costs in the profit formula. In the proposed approach, (1) commonality matrix is defined to assign product demands to components and component costs to products, (2) continuous inventory review policy is used to calculate safety inventory, (3) joint ordering is implemented to calculate inventory-replenishment lot size and cycle inventory, and (4) cycle service level (CSL) and expected number of component shortage per replenishment cycle (ESC) are utilized to calculate inventory-understock costs. The design of three beverage containers is used as an illustrative example to demonstrate the proposed approach, and sensitivity analysis is performed to contrast commonality and product family design of the three beverage containers with and without incorporating inventory decisions.
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March 2019
Research-Article
An Approach to Integrate Commonality and Product Family Design With Inventory Decisions
Shun Takai
Shun Takai
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Shun Takai
Contributed by the Design for Manufacturing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 23, 2018; final manuscript received December 12, 2018; published online January 31, 2019. Assoc. Editor: Paul Witherell.
J. Mech. Des. Mar 2019, 141(3): 031704 (18 pages)
Published Online: January 31, 2019
Article history
Received:
June 23, 2018
Revised:
December 12, 2018
Citation
Takai, S. (January 31, 2019). "An Approach to Integrate Commonality and Product Family Design With Inventory Decisions." ASME. J. Mech. Des. March 2019; 141(3): 031704. https://doi.org/10.1115/1.4042340
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