Dresden, Germany
Dresden, Germany

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Pagel K.,Fraunhofer Institute for Machine Tools and Forming Technology | Michael E.,Prufstandstechnik PTL Leipzig GmbH | Rennert R.,IMA Dresden GmbH | Drossel W.,Fraunhofer Institute for Machine Tools and Forming Technology
Olhydraulik und Pneumatik | Year: 2010

This technical article introduces the basic principles of electrorheological fluids. A highly dynamic servo-valve developed based on the mechanics of flow resistances, developed at the Fraunhofer Institute for Machine Tools and Forming Technology (IWU) in cooperation with the PTL Leipzig GmbH and the IMA Dresden GmbH who worked in the framework of promoting research projects by the European Regional Development Fund (ERDF) and the Free State of Saxony, will be presented.

Uebel L.,Siemens AG | Rennert R.,IMA GmbH Dresden | Kaserer G.,Siemens AG
ZEVrail | Year: 2013

The approach of the Avenio platform was to have a look at the light rail system in its entirety. The target is to improve the operating efficiency and the eco friendliness. The modular concept with only one car body module reduces the one time costs. The light weight construction supports the great efforts to save energy and the bogie and drive concept increases the ride comfort and minimizes wear and noise emission. The car concept allows a large number of double doors and is able to reduce the stop time at stations. This fact increases the attractiveness and productivity by shortening the travel time. Den Haag, Doha and Munich decided in favor to the Avenio up to now. The definition of the targets and the results will be presented.

Modification of the Combino tram was one of the most extensive, technically challenging and complex development projects ever tackled in Siemens' long history of railway technology. This program was carried out under intense pressure from 2003 to 2011 and not only involved an analysis of the damage and immediate measures for stabilizing the ongoing operations of 13 customers on three continents, but also called for the drafting of a conversion concept and introduction of the assessment of variable-amplitude fatigue strength as an analytical and experimental means of verifying the operational suitability of car bodies. At the height of the program, 180 employees from all over the company were working on a viable solution. This project set much in motion not only at Siemens, but also throughout the rail industry. The method of assessment adopted has since found its way into a number of regulations and has strongly influenced the development of car bodies for rail vehicles at Siemens, such as the new tram platform Avenio. This article takes the reader through the steps of development once again and shows the insights gained in terms of assessment methods and their relevance for future developments.

Franke R.,IMA GmbH Dresden | Haase I.,IMA GmbH Dresden | Haase I.,TU Dresden | Klemm M.,TU Bergakademie Freiberg | Zenker R.,TU Bergakademie Freiberg
Wear | Year: 2010

Because of their low density, Al based materials are increasingly used for state-of-the-art lightweight construction solutions. With regard to systems subjected to wear, Al alloys cannot be used for highly stressed components, unless they have been made resistant against wear by additional measures such as surface treatment. Electron beam (EB) surface treatment offers a possibility for producing hard wear-resistant layers on components made of Al alloys. Concerning Al materials, distinct improvements of layer properties can be achieved exclusively by the use of liquid phase surface processes (remelting, alloying, dispersing and cladding). The paper deals with current results of investigations in the field of EB surface remelting and alloying technologies of cast alloy AlSi10Mg(Cu) and spray-formed alloy AlSi35. The EB surface treatment of these alloys causes significant changes of properties in surface layers with depths of 0.5-4.0 mm basing on a local modification of microstructure. The hardness and scratch energy density of surface layers are 2-7 times higher than those of the base materials. Moreover, studies on friction and wear behavior under oil lubricated conditions at 80. °C impressively demonstrate the upgraded surface layer properties. Depending on the type of EB-alloying additives (Co, Cu, Ni powder) the specific wear rate decreases by a factor of 10-50 by effectuating a lower coefficient of friction simultaneously. The technologies discussed give a picture of the potential of EB technologies and offer new possibilities for improving service life and reliability of engine components, among others. © 2010 Elsevier B.V.

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