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Langmayr D.,Das Virtuelle Fahrzeug GmbH | Almbauer R.A.,University of Graz | Peller N.,Audi AG | Puntigam W.,Audi AG | Lichtenberger A.,Steyr GmbH and CoKG
Journal of Fluids Engineering, Transactions of the ASME

In this paper we introduce a novel method for calculating 3D flow through the underhood compartement of a vehicle. The method is based on the system of Euler equations, which are numerically solved by a finite volume approach. The total number of finite volumes is very low (<1000 cells). The applied numerics are calibrated to recapture a preceding detailed computational fluid dynamics {CFD) simulation. This calibration is established by two sets of factors. The main advantage of the present approach is that the calibration factors can be inter-and extrapolated between different CFD simulations. © 2013 by ASME. Source

Glensvig M.,Das Virtuelle Fahrzeug GmbH | Stolz M.,Das Virtuelle Fahrzeug GmbH | Willne B.,Das Virtuelle Fahrzeug GmbH | Daum S.,AVL List GmbH
IFAC Proceedings Volumes (IFAC-PapersOnline)

In conventional operation of Diesel engine applications there is a tradeoff limiting performance and emission targets, as these targets are counteracting. One interesting new approach to improve both performance and emission at the same time is the use of the so called venturi booster technology. Providing additional fresh air from a compressed air tank to the intake manifold during transients has been successfully applied to diesel engines in the past. However the support of fresh air only has some disadvantages with regards to EGR transport. The venturi booster technology in contrast is able to provide the required amount of fresh air and the necessary amount of recirculated exhaust gas as well during transient operation. System setup, control strategy and promising test results are presented. © 2011 IFAC. Source

Jalics K.,Das Virtuelle Fahrzeug GmbH | Nemeth D.I.I.,Das Virtuelle Fahrzeug GmbH | Priebsch H.-H.,Das Virtuelle Fahrzeug GmbH | Schleinzer G.,Das Virtuelle Fahrzeug GmbH | And 2 more authors.

The environmental pollution due to noise based on rail traffic especially in urban areas is still an important issue. In order to avoid the drawbacks associated with sound protection walls, new techniques were investigated to reduce the noise at its source. For this purpose vibration reduction measures on railway wheels and rails seem to be especially promising.This paper describes how the corresponding excitation of the wheel/rail contact could be modeled. Chiefly, this paper also describes special models, which were developed for the calculation of the vibration characteristics of wheels and rails. An important part therefore is the consideration of visco-elastic materials. These models would enable the simulation of vibrations that lead to sound radiation and therefore allow the assessment of improvement measures. The models would be adjusted and verified by measurements to finally achieve an optimum design of the damping elements and tuned absorbers. Source

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