Download e-book for iPad: An Integrated Approach in Production Planning and Scheduling by Dr. Stéphane Dauzère-Péres, Jean-Bernard Lasserre (auth.)

By Dr. Stéphane Dauzère-Péres, Jean-Bernard Lasserre (auth.)

Production administration is a big box serious about the entire points relating to creation, from the very backside judgements on the computer point, to the top-level strategic decisicns. during this e-book, we're fascinated with creation making plans and scheduling features. conventional construction making plans methodologies are in line with a now commonly ac­ cepted hierarchical decom?osition into numerous making plans determination degrees. the better within the hierarchy, the extra mixture are the versions and the extra very important are the selections. during this ebook, we purely contemplate the final determination degrees within the hierarchy, specifically, the mid-term (or tacticaQ making plans point and the momentary (or operationaQ scheduling point. within the literature and in perform, the selections are taken in series and in a top-down process from the top point within the hierarchy to the ground point. the selections taken at a few point within the hierarchy are limited by means of these already taken at higher degrees and in flip, needs to translate into possible pursuits for the subsequent reduce degrees within the hierarchy. it's a logic comment to assert that the total hierarchical choice technique is coherent if the interactions among varied degrees within the hierarchy are taken under consideration in order that a call taken at a few point within the hierarchy interprets right into a possible goal for the subsequent determination point within the hierarchy. despite the fact that, and surpris­ ingly sufficient, this significant consistency factor is never investigated and few effects come in the literature.

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At time t, schedule among "ready" jobs Jj (rj with the greatest qi. 3. Set U := U U{Jj}; for all Ji E V, if (Pji i- 0) and (ri tj := t. t := max(tj + Ph min ri). ~ t) of U, the job J j < t + Pji) then ri := t + Pji J,EU If U is equal to J*, then STOP; otherwise, go to 2. Dependent jobs are updated in Step 3. Now, in Step 2, we guarantee to choose a real "ready" job and not one with an underestimated release date. 2, this modification prevents us from computing the sequence with Cmax = 25, and enables us to find the one with Cmax = 24.

The shifting bottleneck procedure is convenient because it finds good solutions relatively fast. This is true if we only consider the simplest version of the procedure, and not the enumerative version (see [Adams et al. 88]). The priority rule-based dispatching heuristic has been implemented in order to observe the impact of the scheduling algorithm efficiency on our iterative planning and scheduling procedure. Moreover, when running the iterative planning procedure on large size examples, this simple and very fast heuristic is needed.

There exists at least one feasible schedule. On the other hand, it may happen that all the demands are not satisfied, in particular if the capacity of the workshop is not sufficiently large. Notation and Definitions 47 It is worth noting that the scheduling decision level is not suppressed. To provide a feasible production plan, this integrated model incorporates scheduling decisions over an horizon usually longer than the standard scheduling horizon at the operational level. Once computed, this production plan (or some part of this production plan over a shorter horizon) is still an input to the operational level.

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