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Evaluation of Steady and Transient CFD Methods for Vehicle Temperature Prediction on the Basis of a Heatshield Test Rig

Rieter Automotive Systems-E. Bendell, M. Hauenstein
  • Technical Paper
  • 2007-04-0058
Published 2007-05-20 by Institution of Mechanical Engineers in United Kingdom
To examine potential accuracy of CFD-based methods for calculating vehicle surface temperatures, a detailed correlation study has been made of a heatshield test rig. The test rig is geometrically simple, but the heat transfer is complex, representing all of the mechanisms found in a vehicle, and the CFD method must include both radiation and lateral conduction in order to be successful.Various Reynolds Averaged Navier Stokes (RANS) approaches have been used on a variety of mesh types. A Detached Eddy Simulation (DES) was also run to understand the flow which is in reality unsteady. Quite good prediction accuracy is possible using RANS, but choice of turbulence modelling and mesh resolution is critical to success, and we describe this and the resulting temperature predictions in detail.

Effect of Several Engine Encapsulation Concepts on Emissions, Consumption and on Thermal Safety of a Vehicle

Rieter Automotive Systems-H. De Ciutiis, T. Bürgen, L. Gorlato
  • Technical Paper
  • 2007-04-0035
Published 2007-05-20 by Institution of Mechanical Engineers in United Kingdom
This experimental study was started within the R&T department of Rieter Automotive Systems in order to investigate how thermo-acoustic parts in the engine compartment of a vehicle can be optimized for increasing the storage of heat in the powertrain. From several publications it is known that starting temperature of the powertrain affects fuel consumption, emissions and also thermal comfort in the cabin. Storing heat in the powertrain can be achieved by encapsulating the warm engine components preventing fast cool-down. This, however, conflicts with the need of maximum engine cooling during hard driving conditions such as the hill climb and the maximum speed condition. In particular thermal safety in the engine compartment needs to be guaranteed.This study compares 2 approaches for reducing heat loss from the engine compartment: the first uses material insulation around and on the powertrain, the second reduces the convection cooling in the engine bay.On a specific test vehicle both approaches have been investigated and compared. Also the maximum realistic heat storage potential when combining both approaches has been quantified. Convective cooling proved…
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Functional and Material Acoustic Optimization integrated into Underbody Systems for Vehicle Performance Improvement

Rieter Automotive Systems-Maurizio Mantovani, Dirk Lehmann
Published 2007-05-15 by SAE International in United States
The first applications of plastic panels in the underbody targeted weight savings (elimination of the PVC coating) and aerodynamic drag reduction.The potential for the integration of acoustic functions in such new elements, addressing both interior and exterior noise, was readily recognized and demonstrated in several studies. These also pointed out the synergic interaction of the new elements with common systems and components of the sound package.While it was rather straightforward to define an acoustic design and optimization process, based on material modeling combined with component, system and vehicle SEA and FEM simulation, it also became clear that the integration of acoustic functions involved many problems that needed to be addressed in a multidisciplinary approach. This must consider the underbody elements as a part of a system having to fulfill functional requirements related to exterior and interior noise, aero-acoustics, aerodynamics for drag reduction and driving stability, thermal protection, thermal management in the engine compartment and in the tunnel area, protection of the body, assembly and durability. The harsh environment involves development of materials able to stand…
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ECoustics -- Vehicle Sound Package Inspired by Environmental Design

Rieter Automotive Systems-Aureli Boyer, Jean Casulli, Jan Horak, Hameed Khan
UGN, Inc.-Michael D. Berdine
Published 2007-05-15 by SAE International in United States
The environmental issues are mounting for a global automotive industry associated with ever-increasing output. Major issues include fuel consumption, vehicle emissions, consumption of non-renewable materials, and recycling of waste materials.This paper provides an overview of recent advances in new acoustic materials based on recycled and sustainable sources for “environmental” vehicle sound packages that address NVH and trim acoustics requirements. Thanks to new eco-design standards, both the OEM and suppliers can increase and improve eco-friendly aspects such as recycling end of life vehicles.The use of end of life materials in a new car includes: automotive shredded residue (ASR) such as tire fibers included in damping materials, chips foam from seats for acoustical shields, and automotive shredded residue for acoustical dash insulators.
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Design for Acoustic Excellence in Conjunction With Environmental Roadmap

Rieter Automotive Systems-Jean Casulli, Vincent Eckert, Hameed Khan
Contract Engineer-James Fisher
Published 2005-05-16 by SAE International in United States
Acoustic packages are designed to excel in their primary function: sound reduction. Thereby, they already improve one environmental aspect, which is the reduction of the external noise emission. This paper explores the possibilities of increasing environmental value intrinsic to the product as well as the related potentials such as waste saving and the use of recycled materials. The discussion will also address the disposition of the acoustical parts when the vehicle is at the end of its useful life (ELV.) The critical issues within the recycling loops of acoustic packages as well as the potential of the recovered streams are highlighted.
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Japanese, American and European Soundproofing Treatments: Are There Differences?

Rieter Automotive Systems-J.-Ph. Thome, H. Kiessig, A. Bertram, J. Van Buskirk
  • Technical Paper
  • 963328
Published 1996-03-20 by Societe des Ingenieurs de l'Automobile in France
This paper presents typical examples of car interior soundproofing treatments and design principles, based on data gathered in Japan, the United States and Europe.The various treatments are compared with respect to driving conditions, possible body design changes, and how optimal noise reduction can be achieved.In regard to Japanese and European cars, trends clearly favor sound-damping and insulation, respectively. Differences among soundproofing treatments have direct consequences for noise reduction. In Japanese cars, greater attention is paid to treating mid-range frequencies, while European cars offer better high-frequency noise reduction. These specific differences can be explained by typical driving conditions, which are different in these two regions of the world. No trend could be identified for American-made vehicles.The paper concludes that optimal soundproofing for a car is not determined on the basis of a trend, but rather on a case-by-case basis.