SAE Update - August 2021 - 31

TB SAE Medical Standards Ad 0121_1.qxp_Layout 1 12/16/20 2:23 PM
to apply sound package in a different way now
that there are different noise sources that we
perceive differently, " explained Autoneum's
Frey. Additionally, there are material
considerations regarding durability, water
absorption, lightweighting, and thermal
requirements.
" In Europe, there are more stringent pass-by
noise regulations, which for us translates to
very high acoustic requirements at a material
level for underbody panels, " Frey added. " It's
important to make something that meets
those acoustic requirements while also taking
into account aerodynamic, water absorption,
and stone impingement considerations.
Generally, things that absorb sound really well
also absorb water really well. "
To address this underbody challenge,
Autoneum developed its Ultra-Silent material
package, a polyethylene terephthalate (PET)based,
glass-free mono-material. According to
the company, the material is water-resistant
and heat-resistant while reducing vehicle noise
by up to two decibels. Ultra-Silent is
particularly well suited for electric vehicles to
reduce underbody panel weight while
reducing tire noise and absorbing mid-high
frequency noise emitted by the accessories.
Some electric vehicle applications require
sound packages that are also both lightweight
and act as a thermal barrier. Autoneum has
adapted its textile interior technology to create
Hybrid-Acoustics PET material that can be
molded to encapsulate an electric motor to
provide both sound absorption and thermal
insulation. The material is designed to be 40%
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SAE Update - August 2021

Table of Contents for the Digital Edition of SAE Update - August 2021
