The CBE philosophy considers
an understanding of all relevant noise
generating elements an essential part of the total approach to Aircraft
Interior Noise Reduction.
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The successful treatment of
all of the following "areas of concern" is
fundamental to achieving a low noise interior.
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- Skin, Interior Panel and Bulkhead
damping.
- Intercostal and other cavity energy
damping and absorption.
- Frame radiation reduction.
- Interior Panel, Bulkhead and
Cabinetry isolation.
- Floor/carpet insulation.
- ECS Noise reduction. (Achieving
optimum air flow. Optimum placement of mufflers. Plenum and
distribution box damping and insulation. Bleed-air-mix noise reduction.
Air return treatments).
- Panel integrity concerns. (Noise
leaks caused by lighting fittings, ECS attachments and other acoustical
breaches in the interior panel system).
- Mechanical isolation and acoustical
baffling of noisy components such as fans, pumps, power supplies and
inverters.
- Sink and shower drain noise
reduction.
- Noisy Vent treatments.
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- Fuel Pump and Hydraulic Pump noise
reduction strategies.
- Effective skin damping techniques
at antennas and other boundary layer protrusions and discontinuities.
- Exterior fairing damping methods.
- Optimum Engine balance and
isolation.
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CBE's extensive experience
has shown the selection of the most
appropriate materials and material combinations for treatment of these
concerns to be of prime importance in achieving the most weight
efficient and acoustically productive results. It is however only
through a scientific distribution of these materials that a truly
weight efficient design can be realized. This is most accurately
achieved through careful analysis of the noise signature of the subject
aircraft under its normal cruise-flight conditions. The CBE philosophy
asserts that it is only through the intelligent and experienced use of
the data so obtained that a highly optimized design, specifically
tailored to the subject aircraft and its unique problems can be
possible.
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