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• W46222013 abstract "F. Marmier, C. Varnier, N Zerhouni Laboratoire d'Automatique de Besancon (LAB), UMR CNRS 65 96 - ENSMM/UFC, 24 rue Alain Savary, 25000 Besancon, FRANCE Abstract Skills management in the industry is one of the most important keys in order to obtain good performance with production means. Especially in maintenance ser vices field where the different practical knowledge or skills are their working tools. We address, in this paper, the both assignment and scheduling problem that can be found in a maintenance service. Each task tha t has to be performed is characterized by a competence level required. Then, the decision probl em of assignment and scheduling leads to find the good resource and the good time to do the task. For human resources, all competence levels are differe nt, they are considered as unrelated parallel machines. Our aim is to assign dynamically new tasks to the adequate resources by giving to the maintenance exp ert a choice between the most robust possibilities. Keywords : Competence, Human Resources, Maintenance, Scheduling , Tasks Insertions, Uncertainties. 1 INTRODUCTION To stay competitive, companies must decrease their costs as much as possible and optimize their production m eans operations. In order to support better equipments' availabilities, and through them the company one, t he maintenance service intervenes. It deals with probl ems before or after the breakdowns, at any place. This improvement mainly requires a better management of the workforce and its skills. It is difficult to determine precisely the required human resource number in a maintenance service [1]. Indee d, factors making enabling capacity adaptation are pro ne to uncertainties. Those are due to several parameters (variations of the intervention requests which are never similar, arrival dates of requests, requests' conte nts, required treatment duration and equipments availabi lities as well as elements related to the real interventio n treatments). Thus, the different tasks are well kno wn when they occur. The reactivity and the organization of the maintenance service will depend on the importance o f the required treatment. There are mainly two types of maintenance activitie s: the preventive maintenance, whose activities can be lon g term planned, and the corrective maintenance which is re lated to the non foreseeable breakdowns. Within the serv ice of maintenance, employees have different skills and di fferent qualification levels. Treatment speed and thus the service reactivity will depend on the choice of the employe es assigned to the task. We give in this paper a method to take care of the new tasks apparition and we propose a decision support to insert it in the current schedule. We work on the c ase where the task assignment has already been realized (for example with the heuristic presented in [2]. The go al is to disturb as less as possible the current schedule. H owever, the whole schedules are subject to uncertainties an d variation between theory and reality. In order to p ropose insertion solutions for a new task, we have to dete rmine which places in the schedule are the more flexible in order to obtain a scheduling which would be the most robu st (the less sensible to uncertainties). The fact to propos e schedule solutions taking care of variation by anti cipating show that our scheduling method is proactive. In this article, we detail a methodology which will allow us to assign tasks to resources by considering disturb ances. The rest of the paper is organized as followed: In the second section, we will introduce how maintenance services can be managed. In the third part, we will present our scheduling problem. Then we develop our model a nd a resolution approach. Finally, we will discuss the d ifferent obtained results. 2 MAINTENANCE MANAGEMENT In scheduling and planning, the time horizon is oft en split in periods (the short, medium and long term). Then, we can study events on each time interval and not on a continuous scale of time. The context of this artic le takes place in the short term horizon. In this approach, we consider that maintenance tasks have to be schedule d when they occur (generally it is the case of correc tive maintenance). The manpower is then the limiting fac tor in the scheduling realization. Human resources are the n organized in the maintenance service which has to p lan their work. 2.1 Organization There are various forms of management of maintenanc e. Indeed, if the company itself does not assume maintenance, this one can then be sub-contracted. T he monitoring, the preventive and corrective maintenan ce can thus be entrusted directly to the manufacturer of t he equipment (expert on this type of equipment) or wit h a company specialized in industrial maintenance (expe rt in monitoring and in remote maintenance field but gene ral practitioner as for the monitored equipment). The equipment can also be rented, and if maintenance is not assumed by the user company, it can be sub-contract ed too. Within each plant, the maintenance service has to maintain equipment under operation. The level of th e results to reach by the maintenance services is gen erally predetermined. Either a contract is signed between t wo (or more) partners fixed their cooperation terms, or th ere is a moral agreement inside the company between production and maintenance service, that fixes the equipment efficiency required. In both case, the objectives o f the maintenance are defined by a level of availability (that can be different from equipment to another). The guaran teed availability is a percentage of the opening time. I f, for a machine or a group of machines, the objective of availability is not achieved, penalties have to be paid by the service provider. Conditions concerning the pen alties are defined while elaborating the contract and are function" @default.
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• W46222013 date "2007-07-30" @default.
• W46222013 modified "2023-10-02" @default.
• W46222013 title "Dynamic and multi-criteria scheduling of maintenance activities." @default.
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