The job has been oriented to the development of models of simulation of one supply chain based on the approach system dynamics. This language of graphical modellazione is one of the great advantages of the models constructed with Powersim Study and offers the possibility to create clear and transparent structures.
To be developed a simulation model, for the management of the warehouse supplyes, in order to test the main potentialities of the software and its characteristics.
After to have defined all the variable ones and to have inizializzato the system in equilibrium, the object of the study has been that one to observe the behavior of the model under various conditions of variation of the orders of the customer.
Such study has been facilitated from the possibility, offered from the software, of being able to bring back in diagrams and tables the course of the variable ones in the period of simulation and to be able to confront them is in the event of various conditions of the question (unexpected increase of 20% or chance variation) is in the event of various political of management of the waited for orders (model to mobile pursuit or average).
The comparison has allowed to evidence the meaningful variations in the management of the warehouse and of the back orders to you. The simulation with Powesim Study allows therefore to develop and to examine various strategies in a computer before perfecting them in the real world.
An other characteristic that has been thought important in the study of the simulation models is that Powersim offers the possibility to directly communicate with Microsoft Excel to the aim to render available diagrams and tables of comparison that concur to visualize the differences in adopting various strategies of management of the supply chain.
As far as the phase of learning of I use it of the software has been stated a sure difficulty begins them due to the clarity and semplicità of the handbook of the customer above all as far as the mathematical functions not to associate to the variable diagrams (flows, levels, constants, etc..).
Fortunately the presence, inside of the package software of tutorial demonstrated to you has rendered little ostica the phase than study. After all it can be asserted that, given the dinamicità (es. variability of the question) and chance (es. previewed indisponibilità of a machine) of the productive systems is not always easy to answer in precise way to questions that imply important implications are economic that operated to you.
The dinamicità sets up from the market, the requirements to arrange quality and costs, integration of the factories in the optical of the supply chain force to ristudiare the production processes constantly.
In this optical the simulation is an effective instrument in order to help the manager to take decisions in optimal way is to operating strategic level that.
From it turns out to you obtained, putting to comparison the two models of simulation with question to chance variation and step in the various political of the attended orders, for the management of the warehouse has been found that:

• In the model with increment of 20% of the question one political of mobile forecast to average is preferibile if the warehouse to a level more low in the first months of management is wanted to be maintained in order then to grow in way more consisting regarding that one of the model to pursuit in the final part of the simulation;
• In the model to chance variation of the question, using mobile politics to average for the attended orders, the level of the warehouse grow to of over of the wished level in order then decreasing in the second part of the simulation; using, instead one political to pursuit, the level of the warehouse after a decrease begins had them to the chance variation of the question grows gradually until catching up, without never to exceed it, the wished level.