Integrated modelling approach in support of change-capable PPC strategy realisation
Authors: Tariq Masood, Richard Weston
Abstract
The increasing demand for customization, reduced time to market and globalization are the real challenges for today’s manufacturing enterprises (MEs). Therefore MEs can reduce these competitive pressures by becoming more and more change-capable. The agile and lean manufacturing philosophies must complement the application of reconfiguration techniques. However, choosing and applying the best philosophies and techniques are far from being well understood and well structured processes because most MEs deploy complex and unique configurations of processes and resource systems, and seek economies of scope and scale in respect of a number of distinctive product flows. It follows that systematic methods of achieving model driven reconfiguration and interoperation of component based manufacturing systems are required to design, engineer and change next generation MEs. This paper discusses research aimed at developing and prototyping a model-driven environment for the design, optimization and control of enterprises with an embedded capability to handle various types of change in an example of a production planning and control (PPC) scenario. The developed environment supports the engineering of common types of strategic, tactical and operational process found in many MEs. Also reported are initial findings of manufacturing case study work in which coherent multi-perspective models of a specific ME have facilitated process reengineering and associated resource system configuration and interoperation. In order to understand the system prior to realisation of any PPC strategy, multiple process segments of organisations need to be modelled. The paper considers key PPC strategies and describes a novel systematic approach to create coherent sets of unified models that facilitate the engineering of PPC strategies. Case study models are presented with capability to enable PPC decision making processes in support of complex organisation design and change (OD&C). The paper outlines key areas for future research including the need for research into unified modelling approaches and interoperation of partial models in support of complex OD&C.

It another technique which has contributed to the needs for reconfigurable manufacturing.
I have few comments and questions...but do give give feedback on that...
1. This technique seems more applicable to assembly sector based on the given case study.
2. a. The simulation for PPC is perfect. But, what if the quantity produced in the specific time doesn't 100% good.
b. Is there any tolerance has been included to the total product quantity by considering the acceptance quality yield? (e.g. max. 0.01% defect).
Q+C+D+F(2R+A)
;)
ZE

Thanks Zuhria08 for your comments and questions. The answers are as follows:
1. This approach is applicable not only to assembly sector but almost all manufacturing sectors and well beyond that. The assembly sector case study was chosen mainly due to the scope of reconfiguration and involved complxity levels. We have also applied the approach in some other SMEs and large Automobile and Aerospace companies as well and it worked very well.
2a. The product rejection due to quality in assembly area was very low (almost none), therefore we considered it out of scope in our models. However, it could be included as a percentage reject into the model.
2b. The tolerance has not been included to the total product quantity for assembly area at the moment. However, this is useful in other areas of the ABC company like Denibbing after 'Spray and Paint' where they have to rework. We could include the percentage defect while modelling the 'Spray and Paint Shop'. Thanks for the good suggestions.
I hope these answers help. In case of any further questions please don't hesitate in posting, you're very welcome. Thanks.
Regards
Tariq
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Dear Authors,
Thank you very much for your contribution to IPROMS2008.
Could you please upload the video presentation and respond to any questions addressing your paper as quickly as possible.
Best wishes,
Ashraf Afify
Co-chair for the Intelligent Planning and Scheduling Systems session