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Original Articles

A hierarchical indicator for performance evaluation and supervision of a manufacturing system

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Pages 179-191 | Published online: 31 May 2012
 

ABSTRACT

Indicators definition is essential for manufacturing system performance evaluation. When the relevant decision system is hierarchical, so must be indicators. We propose in this communication an indicator: the stock profile, which fits multi—level decision making for time relevant aspects. The presentation is divided in four parts. The first part recalls the main elements of indicator identification: the abstraction level, the nature and the supporting elements. The second part presents the definition of basic stock profile, their aggregation possibilities for a single level decision system and a way to use them for supervision. In the third part, the use of stock profile when dealing with hierarchical decision making is explained. In this purpose, some modifications and adjustments of the stock profile basic model are given and a method allowing to supervise production at each level of decision is presented. This method is “vertically” consistent meaning that each level can independently understand what it is happening in the workshop while keeping inter—level consistency. These developments are illustrated with a flow—shop case study in the fourth part. Assumptions, remarks and future works are discussed in the conclusion.

RÉSUMÉ

La définition et l'exploitation d'indicateurs est nécessaire pour les ateliers manufacturiers et plus particulièrement pour les systèmes où la décision est hiérarchisée. Dans ce cadre là, nous proposons dans cet article un nouvel indicateur particulièrement adapté: le profil de stock. Notre présentation comporte quatre parties. Nous traitons d'abord les principales caractéristiques permettant d'identifier et de situer les indicateurs. Nous présentons dans un deuxième temps les concepts de base du profil de stock, ses possibilités d'agrégation pour un système de décision à un niveau et son utilisation en supervision. Les ajustements nécessaires pour une utilisation dans un environnement décisionnel hiérarchisé sont ensuite proposés ainsi que la méthode de supervision. Nous illustrons enfin nos propos à l'aide d'un exemple emprunté au cas flow shop.

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