Now showing 1 - 10 of 43
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Semantic Web Framework für die Modellierung und Simulation von Fertigungssystemen

2009 , Gocev, P. , Mertins, K. , Rabe, M. , Uhlmann, E.

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Logistics performance improvement and synchronization of material flow and money flow

2007 , Mertins, K. , Rabe, M. , Schallock, B. , Weinaug, H.

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Capacity assignment of virtual manufacturing cells by applying lot size harmonization

2000 , Mertins, K. , Friedland, R. , Rabe, M.

Decentralized manufacturing cells minimize the lead time of products. However, technical and economical restrictions can prohibit the installation of permanent cells. A possibility to overcome these restrictions is 'virtual manufacturing cells'. These cells are defined by production teams who are responsible for the complete process of a group of products. Unlike permanent cells, the layout can be kept in a workshop structure. This results in a double competition between the orders and between production teams for the use of capacities. A new approach to solving this double competition is to limit the occupation time of capacity units. Combined with alternating access to resources by the production teams, this ensures a clearly defined order sequence. A successful way to achieve the limitation of occupation time is the harmonization of lot sizes. This analytical method should be supported by simulation to consider the dynamic behaviour. The authors have developed a simu lation reference model to limit the expense of simulation studies for this purpose.

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Minimisation of lead time by virtual manufacturing cells and lot size harmonisation

1999 , Mertins, K. , Friedland, R. , Rabe, M.

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SME services in an open environment with demand on risk management

2008 , Mertins, K. , Rabe, M. , Weinaug, H. , Jäkel, F.-W.

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Inter-enterprise planning of manufacturing systems applying simulation with IPR protection

2005 , Mertins, K. , Rabe, M.

Discrete Event Simulation is a well-proved method to analyse the dynamic behaviour of manufacturing systems. However, simulation application is still poor for external supply chains or virtual enterprises, encompassing several legal entities. Most conventional simulation systems provide no means to protect intellectual property rights (IPR), nor methods to support cross-enterprise teamwork. This paper describes a solution to keep enterprise models private, but still provide their functionality for cross-enterprise evaluation purposes. Applying the new modelling system, the inter-enterprise business process is specified by the user, including a specification of the objects exchanged between the local models. The required environment for a distributed simulation is generated automatically. The mechanisms have been tested with a large supply chain model.

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Capacity assignment of virtual manufacturing cells by applying lot-size harmonization

2000 , Mertins, K. , Friedland, R. , Rabe, M.

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Integration of factory planning and ERP/MES systems: Adaptive simulation models

2008 , Mertins, K. , Rabe, M. , Gocev, P.

The purpose of this paper is to demonstrate the approach of a scalable, flexible and adaptive simulation model used in factory planning on the basis of existing ERP and MES data. The dynamic simulation model was developed to validate and verify the changes of the production yield during factory planning and restructuring in the shop floor. This includes machinery relocation and ramp-up, new product phase-in, product portfolio changes and new product qualification processes. The objective is to enable an industrial engineer without simulation knowledge and experience to perform the simulations. Moreover, the model facilitates an analysis of the results for different scenarios, using the actual data from the ERP and MES systems.

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Distributed modelling and simulation of supply chains

2005 , Mertins, K. , Rabe, M. , Jäkel, F.-W.

The behaviour of supply chains, especially those in which several enterprises are involved, is often difficult to predict. For the analysis of such systems, which cannot be evaluated by analytical models, discrete event simulation is an adequate technology. The competence of the local engineers about the single chain elements has to be incorporated into the simulation models. This can be done best by establishing local models, representing the local section of the supply chain. Up to now, integrating such local models into one complete model was time consuming and error prone. Even more critical, local maintenance of partial models was inhibited. A new approach solves this problem, exploiting the advantages of distributed simulation. Furthermore, this approach provides encapsulation, if supply chain partners do not wish to publish details of their node to other partners. The interfacing description is based on the High Level Architecture (HLA) and generates Extensible Markup Language (XML) files, which provide a specification of each supply chain node and its interfaces.

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Unternehmens- und Fabrikplanung

2000 , Mertins, K. , Rabe, M. , Jochem, R.