SAE Update - December 2021 - 8

FOCUS: NVH
Internal Combustion, Electrification
and the future of Automotive NVH
Regardless of their advantages
and disadvantages in the NVH
sphere, IC engines are rapidly
disappearing from ground
vehicles. Replacing them are
electric machines, which are
known to be significantly quieter
than their IC engine
counterparts. Substitution of IC
powertrains with less noisy and
often less massive electric
powertrains leads to manifold
NVH design challenges. Chief
among these challenges is the
lack of masking noise, but there
are also new and unique NVH
characteristics associated with
electric motors that must be
addressed.
Unfortunately, not much
knowledge from the study of
powertrain vibration carries over
from IC engines to electric
motors. Traditionally, the IC
engine was treated as a relatively
low frequency NVH source. For
example, many studies have
been published about IC engine
idle vibration, which is
associated with low frequencies.
The most important difference in
electric motors from a vibration
perspective is the frequency
range of vibration produced,
where high frequency vibrations
are present that were not a
8
December 2021
In this test an electric vehicle is instrumented with tire microphones at all
four corners, with two microphones per tire, one in front and one behind, to
understand the tire contribution to pass-by noise.
concern in the case of IC engines. For example, the
operating frequency of some of power electronics in
an electric vehicle is in the 10 kHz and above
frequency range. These higher frequencies of interest
drive a new engineering focus on their implications to
driving comfort in automobiles.
Beyond different powertrain frequency content, an
example of a startling difference between
conventional IC vehicles and their electric
counterparts is in pass-by noise regulations.
Conventional vehicles are subject to pass-by noise
regulations that ensure they are not too loud.
Conversely, electric vehicles are subject to pass-by
noise regulations that ensure they are not too quiet.
Electric vehicles are quiet when passing by since the
only primary carry-over noise source from
conventional vehicles is tire noise.
UPDATE
Jennifer Bastiaan / Kettering University

SAE Update - December 2021

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

SAE Update - December 2021 - Cov1
SAE Update - December 2021 - Cov2
SAE Update - December 2021 - 1
SAE Update - December 2021 - 2
SAE Update - December 2021 - 3
SAE Update - December 2021 - 4
SAE Update - December 2021 - 5
SAE Update - December 2021 - 6
SAE Update - December 2021 - 7
SAE Update - December 2021 - 8
SAE Update - December 2021 - 9
SAE Update - December 2021 - 10
SAE Update - December 2021 - 11
SAE Update - December 2021 - 12
SAE Update - December 2021 - 13
SAE Update - December 2021 - 14
SAE Update - December 2021 - 15
SAE Update - December 2021 - 16
SAE Update - December 2021 - 17
SAE Update - December 2021 - 18
SAE Update - December 2021 - 19
SAE Update - December 2021 - 20
SAE Update - December 2021 - 21
SAE Update - December 2021 - 22
SAE Update - December 2021 - 23
SAE Update - December 2021 - 24
SAE Update - December 2021 - 25
SAE Update - December 2021 - 26
SAE Update - December 2021 - 27
SAE Update - December 2021 - 28
SAE Update - December 2021 - 29
SAE Update - December 2021 - 30
SAE Update - December 2021 - 31
SAE Update - December 2021 - 32
SAE Update - December 2021 - 33
SAE Update - December 2021 - 34
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