An SEA-based Procedure for the Optimal Definition of the Balance between Absorption and Insulation of Lightweight Sound Package Parts Autoneum

Format:

Conference/Event

Author/Creator:

Bertolini, Bertolini, author.

Contributor:

Courtois, Theophane

Conference Name:

7th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference (2012-06-13 : Graz, Austria)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Due to the pressure on CO₂ reduction, during the last years"lightweight" parts have become rather popular, asopposed to "conventional" parts, traditionallyconstituted by a heavy mass layer on top of a soft decoupler. While"conventional" parts are based on pure insulation,"lightweight" parts propose some kind of compromisebetween absorption and insulation. This makes their designdifficult: designing a "lightweight" part means adjustingin the proper way the balance between the absorption and theinsulation provided by the part itself and the search for anoptimal balance has to take into account relevant vehicle-dependentboundary conditions. Typically, in the design of a lightweight dashinsulator a key role is played by the presence of theinstrumentation panel and by the importance of thepass-throughs.This article describes a procedure that can help the NVHengineer in the above-mentioned task. The procedure relies on anSEA model of the vehicle under analysis and it is configured as anoptimization algorithm where the frequency-dependent optimalbalance between absorption and insulation is determined. Afterdescribing the mathematical procedure, an application to a vehicledash insulator is described. Such application shows how, to obtainan optimal result at vehicle level, it is necessary to tune thebalance between absorption and insulation in a different way forthe different regions of the part. This indicates even more howcomplex the design of a lightweight part can be and how risky it isto judge its performance simply on the basis of analyses on flatand constant-thickness samples

Notes:

Vendor supplied data

Publisher Number:

2012-01-1527

Access Restriction:

Restricted for use by site license