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The object-oriented process flow modelling of discrete production systems

Habel J., Wojakowski P.

Czasopismo Techniczne. Mechanika

2010

R. 107, z. 2-M

83-90

The main idea of this paper is related to building of models allowing to visualise and examine some aspects of a discrete production system. Those models, which are simplified, artificial representations of real environment, constructed to facilitate off-line study of real objects or complex systems, will allow to test out in advance the impact of planning decisions and therefore avoid making wrong decisions and minimize the disruption to the real process. The idea of process flow model is based on the machining subsystem model, which has been worked out for describing only machining processes. The extension of that model is proposed in this paper. The new process flow model includes a description of materials flow as well (products, tools, tooling etc.), needed for manufacturing raw materials into finished products. Materials flow occurs between consecutive work stations or assembly stations and it concerns transportation, manipulation and warehousing of materials. So it is set a technological subsystem and a materials flow subsystem apart. An object-oriented models for these subsystems has been worked out. Whole production system is described as a set of objects, which consist of attributes. Each object has got a state space. A state space can describe single object, a pair of objects or a chain of objects. Between the objects, which are made up of a couple of objects, some relationships occur. An object state space can change under the influence of an activity sequence. Activities are divided into manufacturing activities model and auxiliary activities model. The second model consists of objects from materials flow subsystem. These objects influence other objects in production system by auxiliary activities realization, which change a state space of them by changing their attributes values. Auxiliary activities allow to make manufacturing activities. Auxiliary activities model is described in this paper.

W artykule przedstawiono koncepcję utworzenia obiektowo-zorientowanego modelu przepływu produkcji, aby możliwa była analiza pewnych kwestii, związanych z realizacją procesów produkcyjnych w dyskretnym systemie wytwarzania. Jako główny cel założono, że praca z modelem ma ułatwić planowanie zdolności produkcyjnych, co w konsekwencji pozwoli uniknąć błędnego podejmowania decyzji dotyczących przyjmowania nieopłacalnych zleceń. Model składa się z dwóch głównych części, gdzie wyróżniono model budowy systemu wytwarzania oraz model działań produkcyjnych.