Inhaltszusammenfassung

The change from a push to a pull strategy constitutes a considerable intervention in the operational logistics and has effects on procurement, the design of processes and the evaluated, internal inventories. Simulation models that anticipate the consequences of such a change need to fulfill two main objectives: 1.) They have to represent the system behavior over time, but in time lapse instead of real time. To achieve this, two approaches can be used, the first of which is a clock pulse simul...The change from a push to a pull strategy constitutes a considerable intervention in the operational logistics and has effects on procurement, the design of processes and the evaluated, internal inventories. Simulation models that anticipate the consequences of such a change need to fulfill two main objectives: 1.) They have to represent the system behavior over time, but in time lapse instead of real time. To achieve this, two approaches can be used, the first of which is a clock pulse simulation where the system's state is calculated for every discrete time step, e.g. each second. The second one is an event triggered simulation where only those points in time are computed at which an actual change occurs. Both methods have benefits and drawbacks as is elaborated. 2.) They need to take into account actual production data and, in order to use this data, implement decision rules. These aspects can be realized with Petri nets that the authors use as preferred modeling language for decades, because Petri net models are illustrative and can be executed or simulated, respectively. A novel, web-based Petri net modeling and simulation environment - the Process-Simulation.Center - allows for training modelers and testing different procedures and techniques of model generation. Using a teaching laboratory for logistics as a sample application, clock pulse and event triggered simulation models are demonstrated, as well as how they can be developed, how they have to be interpreted, and which possible obstacles have to be considered. Concretely, the consequences of switching logistics processes from push to pull principles are regarded concerning the storage costs. This paper demonstrates the interplay between new modeling approaches with the aid of Petri nets and the novel tool without which these models would not have been possible.» weiterlesen» einklappen

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DFG Fachgebiet:
Informatik

DDC Sachgruppe:
Informatik