Commande des systèmes manufacturiers non-fiables en intégrant des aspects environnementaux

Abstract

In the recent years, the integration of environmental dimension has attracted much attention and public awareness about environmental concerns has increased. At the country level, the Kyoto Protocol (1997), signed by 37 industrialized countries and the members of the European Union (EU), has encouraged those countries to reduce their greenhouse gas (GHG) emissions (Toptal, 2014). The manufacturing industry is also affected by this change in the consideration of the environment. For example, according to the Government of Quebec, for 2010, the industrial sector was the second (after the transport sector) in terms of greenhouse gas emissions (GHG) with 32.9 % of total emissions in the province. Thus, deciders must develop the best environmental management practices without losing sight of the economic aspect. In this context, in this master's thesis, we focus on the problem of integration of environmental aspects in the management of manufacturing systems under stochastic optimal control approach. In practice, the manufacturing domain is characterized by a very dynamic behavior due to the different aspects to be taken into account simultaneously (production, maintenance, quality ...) in addition to the random events (failure, repair activities, degradation ...). In this research, we addressed the problem of unreliable manufacturing systems control by considering the environment protection and control in the strategic decisions of the company. In the first part, we study an unreliable manufacturing system that generates emissions into the environment. In addition to inventory and backlog costs, we considered an emission cost under the emissions cap approach. We focus then on developing a new retroactive control policy that takes into account emissions in the production decision in order to minimize the total cost and reduce the emission balance. In the second part, we integrate the maintenance in addition to production control in the context of equipment degradation. The originality of this work is at the Relationship developed between the degradation of the machine and the emission generated. A comparative study of different production and maintenance control policies is conducted to study the interaction between the three aspects (production, maintenance and emission). In the last part, we addressed the problem of control of production and emissions in the context of out-sourcing. The objective is to measure the effectiveness of the use of subcontracting to improve the environmental strategy of the company. The effect of subcontractor characteristics (availability, delivery time and cost) on subcontracting and production planning is analysed and a decision support tools are proposed. Given the complexity of the problems studied and the limits of the analytical methods, we proposed to use an experimental resolution approach combining simulation, experimental design and response surface methodology (RSM). In summary, this paper brings a contribution in several respects in the context of unreliable manufacturing systems control. Indeed, we addressed the integration of environmental aspect in the management of manufacturing systems to more than one dimension (production, maintenance, subcontracting).

Date	19 Sept 2014
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Ali Gharbi (Supervisor) & Adnène Hajji (Co-supervisor)