| 1. |
- Ebrahimi, Amir Hossein, 1976, et al.
(författare)
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Formal analysis of product variability and the effects on assembly operations
- 2015
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Ingår i: IEEE International Conference on Emerging Technologies and Factory Automation, ETFA. - 1946-0759 .- 1946-0740. - 9781467379298 ; 2015-October
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Konferensbidrag (refereegranskat)abstract
- A challenge for highly configurable products, like vehicles, is that the product system has to support all possible variants that can be configured by a customer. The production system is often highly automated with software in robots, machines and programmable logic controllers that need to be prepared to handle all possible variants. The link between the product and the assembly system can be expressed through operations where each operation models how a part in the bill-of-material is assembled to the product to be built. Typically the operations have precedence constraints that express that certain parts have to be assembled before other parts might be assembled. Given only the precedence constraints a product can generally be assembled in many different ways and through line balancing the operations are assigned to different stations, machines, and/or assembly workers. For configurable products the bill-of-material might be different for each variant, consequently the necessary operations will be different. However, since the operations have precedence constraints we have to make sure that all possible variants can be successfully assembled while still satisfying all precedence constraints. The contribution in this paper is a fully automated novel method that can determine if all possible product variants can be successfully assembled while still satisfying precedence constraints between operations.
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| 2. |
- Johansson, Pierre, 1986, et al.
(författare)
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Use of Assembly Information in Global Production Networks
- 2015
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Ingår i: The International Conference on Flexible Automation and Intelligent Manufacturing (FAIM). - 9781910864005
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Konferensbidrag (refereegranskat)abstract
- Competition on the world market has forced manufacturers worldwide towards higher quality and performancetargets in production systems. Therefore, the manufacturers need to be more cost efficient in their processes. Dueto the rapid changes in technology and market demands the assembly operators meet a high amount of productvariants every day. Earlier research has shown that depending on how information is presented to the assemblyoperator the quality on produced items. Therefore, a case study has been performed to understand how assemblyinformation is treated at different productions sites in different countries in one production network. The case studyhas been carried out through a web survey addressed to 12 different production sites in seven countries. The casestudy is also compared with a previous case study addressed to production sites in Sweden. Since the study isfocused on Global Production Networks the focus of the study is put on how diversity appears within a productionnetwork. The case study shows that diversity may not just be perceived between countries and different productionsites, it can also be perceived within one production site.
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