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Calculation Process with Lattice Boltzmann and Finite Element Methods to Choose the Best Exterior Design for Wind Noise

Renault-Guillaume Baudet, Cecile Dutrion, Remi Lorenzi, Felix Gendre, Shanshan Geng
Published 2019-06-05 by SAE International in United States
Wind noise in automobile is becoming more and more important as the customer expectations increase. On the other hand, great progress has been made on engine and road noises, especially for electric and hybrid vehicles. Thus, the wind noise is now by far the major acoustic source during road and motorway driving.As for other noises, automobile manufacturers must be able, for a new car project, to specify, calculate and measure each step of the acoustic cascading:SourceTransfers, both solid and air borneIn the case of the automotive wind noise, the excitation source is the dynamic pressure on the vehicle’s panels. This part of the cascading is the one influenced by the exterior design. Even if many others components (panels, seals, cabin trims) have a big influence, the exterior design is a major issue for the wind noise. The wind noise level in the cabin may change significantly with only a small modification of the exterior design.This paper addresses the problem of doing the good choice of exterior design in the early phases of a new vehicle’…
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Simulation Strategy for Structure Borne Noise Sources: Use of Super Elements and Blocked Forces Tensors between Suppliers and OEMs to Validate Components at Early Design Stage

Renault-Céline ROUSSET, Guillaume Baudet
Valeo Systemes Thermiques-Laurent Legot
Published 2018-06-13 by SAE International in United States
This paper is a case study from the TESSA project (French funded research program “Transfert des Efforts des Sources Solidiennes Actives”). The general frame of the work was to assess a collaborative design process between a car manufacturer and a major supplier using FE modelling and condensation of structure borne noise sources as an alternative to classic specification method for structure borne sources.Super elements from different FE commercial softwares have been used to assess the reliability of the method, the compatibility of the softwares and, most important, the relevance of applying a blocked force tensor to the component super element to predict the interior contribution of a component which is the originality of this work.The case study is an internal combustion engine cooling module (fan + shroud + exchangers) from VALEO including all assembly details (clips, decoupling elements) modelled under ABAQUS and its integration in a RENAULT Espace under NASTRAN. The force tensor is the rotating forces generated by the fan unbalance and propagating through the sub-component of the cooling pack to the car-body. The…
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Wind Noise Source Identification by Inverse Method in Wind Tunnel Test

Renault-Guillaume Baudet
Published 2017-06-05 by SAE International in United States
Wind noise in automobile is becoming more and more important as customer requirements increase. On the other hand great progress has been made on engine and road noises. Thus, for many vehicles, wind noise is the major acoustic source during road and motorway driving.As for other noises, automobile manufacturers must be able for a new car project to specify, calculate and measure each step of the acoustic cascading: SourceTransfers, both solid and air borneIn the case of automotive wind noise, the excitation source is the dynamic pressure on the vehicle’s panels. This part of the cascading is the one influenced by the exterior design. Even if many others components (panels, seals, cabin trims) have a big influence, the exterior design is a major issue for the wind noise. The wind noise level in the cabin can sometimes change significantly with only a small modification of the exterior design.This paper addresses the problem of measuring the wind noise excitation source, and especially the low wavenumber part of the pressure on a vehicle’s panel. First, it reminds…
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