Myopia of service-oriented holonic manufacturing systems: the contribution of an observer
Résumé
Service orientation paradigm is particularly well adapted to distributed manu-facturing systems. The difficulty of such systems' production activity control deals with the knowledge management. Indeed, the knowledge is distributed among each entity, which is able to create, modify or communicate them with oth-er entities. As a matter of fact, any entity cannot have a full up-to-date access to all the data of the system. On the shop floor level, a convenient way to implement service oriented manufacturing systems is to rely on the paradigm of Holonic Manufacturing Systems. This paper introduces the possibility of specializing a re-source holon with the objectives to gather the data from the whole holarchy and make these data available to any holon for a decision making. This holon is thus playing the role of a discrete-event observer. After positioning the service-oriented architectures, the HMS reference architecture PROSA is described, especially in terms of decision making. After the decisions were defined, the problematic of on-line decision making in a HMS is described, and a solution of implementation of the observer and of forecasting tools in the architecture is exposed. Finally, two applications are presented, based on an industrial job-shop.
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