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An SEA-based Procedure for the Optimal Definition of the Balance between Absorption and Insulation of Lightweight Sound Package Parts
Technical Paper
2012-01-1527
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Due to the pressure on CO₂ reduction, during the last years
"lightweight" parts have become rather popular, as
opposed to "conventional" parts, traditionally
constituted 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 compromise
between absorption and insulation. This makes their design
difficult: designing a "lightweight" part means adjusting
in the proper way the balance between the absorption and the
insulation provided by the part itself and the search for an
optimal balance has to take into account relevant vehicle-dependent
boundary conditions. Typically, in the design of a lightweight dash
insulator a key role is played by the presence of the
instrumentation panel and by the importance of the
pass-throughs.
This article describes a procedure that can help the NVH
engineer in the above-mentioned task. The procedure relies on an
SEA model of the vehicle under analysis and it is configured as an
optimization algorithm where the frequency-dependent optimal
balance between absorption and insulation is determined. After
describing the mathematical procedure, an application to a vehicle
dash insulator is described. Such application shows how, to obtain
an optimal result at vehicle level, it is necessary to tune the
balance between absorption and insulation in a different way for
the different regions of the part. This indicates even more how
complex the design of a lightweight part can be and how risky it is
to judge its performance simply on the basis of analyses on flat
and constant-thickness samples.
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Citation
Bertolini, C. and Courtois, T., "An SEA-based Procedure for the Optimal Definition of the Balance between Absorption and Insulation of Lightweight Sound Package Parts," SAE Technical Paper 2012-01-1527, 2012, https://doi.org/10.4271/2012-01-1527.Also In
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