Design of the optimum preform for near net shape manufacturing is a crucial step in upsetting process design. In this study, the same is arrived at using artificial neural networks (ANN) considering different unequal interfacial friction conditions between top and bottom die and billet interface. Back propagation neural networks are trained based on finite element analysis results considering f...

In this paper, the drawing process of multi-layer sheet metal through wedge shaped die has been analyzed using stream function and upper bound method. Typically a sandwich sheet contains three layers of metal, where the outer layers are of the same thickness and material and different from those of the inner layer. In this study, a new deformation model has been introduced in which inlet and ou...

In this paper the influence of different parameters on equal channel angular pressing (EADAP) of titanium alloy is investigated. In the first step the most important parameters are selected, and then a table of experiments is designed using Taguchi method. After designing the table of experiments, all of the experiments are simulated using Abacus software and the results are optimized using Tag...

Scheduling und Ressourcenplanung sind Aufgaben, die in vielen Einsatzbereichen wie z. B. der Maschinenbelegung oder Projektplanung vorkommen. In diesem Beitrag wird eine verwandte Aufgabenstellung vorgestellt, nämlich die Ressourcenund Jobplanung im Bereich des Grid-Computing. Auf Grund der Dynamik in einem solchen heterogenen Rechnernetz ist eine schnelle Reaktion und häufige Umplanung innerha...

This thesis introduces the DLXπ+, a super-pipelined processor with variable cycle time. The cycle time of the DLXπ+ may be as low as 9 gate delays (including 5 gate delays for registers), which is assumed to be a lower bound for the cycle time. For the parts of the DLXπ+ that significantly differ form previous implementations correctness proofs are provided. Formulas are developed which compute...

The extrusion of section from round billet poses a great challenge for theoretical modeling of the process using upper bound method. The greatest difficulty in three-dimensional upper bound method is to determine kinematically admissible velocity field. The SERR (Spatial Elementary Rigid Region) technique is fairly applicable for analyzing extrusion of sections having re-entrant corners. A modi...

A new approach in the method of depositing an external lubricant on the die walls of a powder metallurgy press has been developed which allows the compaction of parts from mixes with no or minimal lubricant content. By heating the die to moderate temperatures (70°C 100°C) and using new composite lubricants, optimum thickness lubricant layers can be deposited allowing the compaction-ejection of ...

Integrierte Informationssysteme basieren meist auf einem globalen Schema, dessen Bildung und Wartung aufwändig ist. Praktiker bevorzugen jedoch den direkten Datenaustausch zwischen etablierten Systemen. Diese Anforderungen adressieren Peer-basierte Datenmanagementsysteme (PDMS) in dynamischer und skalierbarer Weise. Anstelle eines globalen Schemas und Schema-Abbildungen zwischen globalem und lo...