Automotive Engineering - August 2022 - 20

EVs drive
NVH material
innovations
Automakers might
fill more cavities
with NVH blocking
material in a day than
the world's dentists
fill in a year.
Dr. Ian Robertson, in a presentation at the 2022 SPE conference
[see SAE Technical Papers 2021-01-1123 and 2017-01-1877]. The
company's current Acousticryl line is a water-borne, sprayable copolymer
emulsion designed for acoustic dampening applications.
Dow claims Acousticryl outperforms competiive NVH treatments
including bake-on bitumen pads, epoxies or PVC.
Virtual analysis
Dow's NVH team receives body-structure CAD data from the customer
two to three years in advance of vehicle launch. Braun works with the
automaker's CAD engineers to study cavities, with an eye toward how
Dow's Arnie Braun sees
significant changes in
the NVH battle driven
by EVs. technologies.
in a castings environment, but they will need more
resonance damping due to that type of construction. "
He admits that because dampening is not a Betafoam
top attribute, Dow chemists are working on innovative
solutions that retain the incumbent material's ultimate
flexibility for filling a wide variety of cavity geometries.
OEMs deem this important as it obviates the need for
redesign and tooling after sheetmetal changes. " Asking
an OEM to move a [access] hole is costly and time consuming.
In the assembly plant, we're shooting our foam
anywhere from five to eight locations, per body side.
Moving holes around is usually not feasible. "
Dow R&D also is well into development of new liquid-applied
coatings to address the high-frequency
modes (from 800 Hz to 3000 Hz) excited by electric
propulsion, noted Dow associate research scientist
20 August 2022
An essential reference on NVH materials
A thorough understanding of Noise,
Vibration and Harshness, and the materials
involved with generating and abating it, is
vital as the auto industry transitions into
electrified mobility. For engineers and technicians
seeking that understanding, a new,
award-winning book published by SAE
International is an essential resource.
Acoustical Materials: Solving the
Challenge of Vehicle Noise is the work of Dr.
Pranab Saha, an SAE Fellow and globallyrecognized
expert on automotive noise,
body interior systems and sound-package
materials. His book details the basics of sound and vehicle noise sources and
covers noise measurement and how vehicle passengers perceive sound. It
offers practical solutions for identifying, reducing and abating cabin noise
using various sound-package material approaches.
Acoustical Materials recently earned a Gold Medal from the Independent
Book Publishers Assoc. (IBPA) in its annual Benjamin Franklin Award program,
Professional Reference category. The book is available through the
SAE website: https://www.sae.org/publications/books/content/r-442/.
Lindsay Brooke
AUTOMOTIVE ENGINEERING
FROM TOP: DOW; LINDSAY BROOKE
https://www.sae.org/publications/books/content/r-442/

Automotive Engineering - August 2022

Table of Contents for the Digital Edition of Automotive Engineering - August 2022

Automotive Engineering - August 2022 - Intro
Automotive Engineering - August 2022 - Sponsor1
Automotive Engineering - August 2022 - CVRA
Automotive Engineering - August 2022 - CVRB
Automotive Engineering - August 2022 - CVR1
Automotive Engineering - August 2022 - CVR2
Automotive Engineering - August 2022 - 1
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