CS35 2013.04
1.1.5-3 1.1.5-3Noise, Vibration and Harshness
Sound Insulation
In vibrational
science
,
t
he mean
ing of sound in
su-
la
tion is
the decoupling of
comp
onent
and sys-
tem.
Exa
m
ple:
•
The eng
ine is in
st
alled on elastic
supp
orting
seat, so that the vibration
is
transmitted into the vehicle body as small
as possible.
•
I
n vech
icle p
r
ocess
engineering, ru
bber
gasket is most related to sound insulation
technology. It acts as a spring.
• The effect of decoupling depends on the
structure o
f
compone
nt
s.
The Directional Installation of Rubber
Gasket Can Reach The Best Sound
Insulation Effect
Absorb
•
S
ound is reflecte
d when meeting hard
surf
ace.
• Sound will be absorbed when meeting
soft external surface. The effect depends
on the material and thickness of
absorbin
g
object.
Example:
• All sound insulation components such as
door decorate
d
board, carpet, ceiling,
carrier an
d se
at should
be insulated
with
vehicle body.
•
Then the
sound wave
will be reflected
dire
ctly and redu
ce the
o
ccu
r of Ha
ll
effect.
It
em
Comp
onent
Descripti
on
1 - Engine
2 - Engine installation
Item Component Description
1 - Reflected wave
2 - Attracted wave
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