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OEM Applications and
Case Histories
This
fiberglass composite is used in a diesel engine compartment
located in the rear of a large motorhome. In addition
to the noise reduction, the design engineers were pleased
to have the heat barrier and fire protection that the
noise blankets offered. These blankets are usually between
1" and 2" thick and have sewn perimeter edges
as well as sewn penetrations.
This
unit has all the necessary design features
to make an exceptional noise enclosure:
- light
tight doors and air baffles
- belly
pan
- acoustical
foam (1" thick with protective facing)
that lines all the hard reflective surfaces
inside the metal enclosure
- 16ga.
or heavier metal fabrication for the enclosure
skin
Most
front engine vehicles can have a significant
reduction in noise that is transmitted through
the fire wall by applying a decoupled barrier
(1# per square foot) on the cabin side.
Care should be taken that all penetrations
are sealed so noise cannot "sneak"
into the interior.
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Embossed
faced acoustical foam
with damping was added
to the inside of this
speaker housing to eliminate
the "tin can"
echo that people heard
on the outside. These
units are used outside
in fast food drive through
order stations.
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.jpg)
Click photo to enlarge
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| A
manufacturer of hotel
ice making machines requested
a fast prototype noise
kit made of 1/2"
thick embossed faced foam.
Drawings were sent to
dB Engineering by email
and the parts were cut
on a water jet table the
next day. These parts
were attached to the inside
of the compressor housing
using PSA (pressure sensitive
adhesive). Significant
noise reduction occurred
at 1000 Hz and higher
frequency bands. |
.jpg)
Click photo to enlarge
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Table
showing how the human ear perceives
noise reduction.
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| Decibel
Reduction |
Reduction
Experienced by Ear |
| 2 |
15% |
| 4 |
23% |
| 6 |
38% |
| 8 |
48% |
| 10 |
56% |
| 12 |
63% |
| 14 |
68% |
| 16 |
75% |
| 18 |
77% |
| 20 |
81% |
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