Automotive Engineering - August 2022 - 5

TECHNOLOGY REPORT
" We're not trying to kill
the sound, we're trying
to design the sound. "
premium-equipment packages, acoustic
glass might see increased fitment in EVs
to stifle road and wind noise. But some
panelists said cautious application might
be required; if the vehicle's entire greenhouse
isn't comprised of acoustic glass,
it can create undesirable, unbalanced
sound zones within the cabin.
Faraday Future's Dreher said EV quietness
" has put a lot more pressure " on
transmission parts and the suppliers
who make them. " Before, you never
heard the transmission, " he said, but in
EVs, which for now generally have comparatively
simple integral transmissions,
gear-related noise is discernable in
much the same fashion as certain drivemotor
frequencies. He said polymerElectrification
and NVH panel at Autotech 2022, from left: Jeff Hodgkins, Brent Dreher,
Lee Rodgers, Jian Pan.
AE Yura Corporation Ad 0622.qxp_1/2 Page Horizontal 5/11/22 4:37 PM Page 1
material gear technology has advanced,
but the generally higher amount of
torque in EV traction motors, as well as
the wider-rpm operating range, is more
demanding on gear materials. Higher
torque levels also increase the need for
tighter tolerances, Dreher added, which
typically adds cost.
Faraday Future has experimented
with " noise-canceling " tires made by
Pirelli, Dreher said. The tires, which
have a polyurethane " sponge " inserted
around the perimeter of the tire cavity,
absorb vibration and certain sound frequencies,
Pirelli claims, reducing " perceived
noise by half. "
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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
Automotive Engineering - August 2022 - 2
Automotive Engineering - August 2022 - 3
Automotive Engineering - August 2022 - 4
Automotive Engineering - August 2022 - 5
Automotive Engineering - August 2022 - 6
Automotive Engineering - August 2022 - 7
Automotive Engineering - August 2022 - 8
Automotive Engineering - August 2022 - 9
Automotive Engineering - August 2022 - 10
Automotive Engineering - August 2022 - 11
Automotive Engineering - August 2022 - 12
Automotive Engineering - August 2022 - 13
Automotive Engineering - August 2022 - 14
Automotive Engineering - August 2022 - 15
Automotive Engineering - August 2022 - 16
Automotive Engineering - August 2022 - 17
Automotive Engineering - August 2022 - 18
Automotive Engineering - August 2022 - 19
Automotive Engineering - August 2022 - 20
Automotive Engineering - August 2022 - 21
Automotive Engineering - August 2022 - 22
Automotive Engineering - August 2022 - 23
Automotive Engineering - August 2022 - 24
Automotive Engineering - August 2022 - 25
Automotive Engineering - August 2022 - 26
Automotive Engineering - August 2022 - 27
Automotive Engineering - August 2022 - 28
Automotive Engineering - August 2022 - 29
Automotive Engineering - August 2022 - 30
Automotive Engineering - August 2022 - 31
Automotive Engineering - August 2022 - 32
Automotive Engineering - August 2022 - 33
Automotive Engineering - August 2022 - 34
Automotive Engineering - August 2022 - CVR3
Automotive Engineering - August 2022 - CVR4
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