Operator assignment with cell loading and product sequencing in labour-intensive assembly cells – a case study of a bicycle assembly company

Yiyo Kuo, Yen-Po Chen and Yu-Cheng Wang

International Journal of Production Research, 2018, vol. 56, issue 16, 5495-5510

Abstract: This research deals with an operator assignment problem in which cell loading and product sequencing are taken into account in labour-intensive assembly cells. In each cell the number of assembly tasks is more than the number of operators, so multi-assembly tasks are assigned to each operator. Because the assembly procedure and time required for each assembly task are quite different for different products, some tasks will be transferred when the product changes. Reducing the number of task transfers can smooth the process of product change. A four-phase methodology is proposed to minimise the total manpower required and task transfers at the same time. The four phases are manpower configuration design, calculating the number of task transfers, manpower requirement minimization and cell loading and product sequencing optimization. A case study from a bicycle assembly company is introduced. For comparison, two methodologies are applied. The results show that the proposed four phase methodology can provided the solution with fewer task transfers based on the same total manpower requirement. However, when the number of products increases, the computation time of the proposed four-phase methodology increases rapidly.

Date: 2018
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DOI: 10.1080/00207543.2018.1470345

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