sound & vibration testing
SOUND & VIBRATION –
TAKING MEASUREMENTS FOR
A SAFER, QUIETER FUTURE
Quieter engines and aircraft, greater fuel savings and
increased reliability require accurate, valid data that
leads to fast decision-making for the optimal product
Sound and vibration are almost always
first indicators for quality. Who
doesn’t remember a situation where,
for example, a noisy seat adjustment,
overhead compartment door or a rattling
noise during takeoff caused us to think
about cheap products, poor maintenance
or quality?
Over 75 years ago intro Per Brüel and
Viggo Kjær recognized a gap in the
possibilities of testing capabilities. Since
then, Brüel & Kjær’s research and
development teams have excelled and
developed a slew of testing capabilities,
methodologies and tools to ensure the
quality, durability and efficacy of just
about any product, from toys to satellites.
The aerospace and defense industry and
its demand for reliable and long-lasting
products has always been a part of Brüel &
Kjær’s core and benefited from many
dedicated applications and products. The
accuracy, quality and reliability of the
products are a perfect fit for the demands
of this industry and multiple
measurement-scenario needs. Since its
founding, Brüel & Kjær has maintained its
role as an innovation driver based on
expertise in sound and vibration and a
focus on customer expectations and future
needs. Many industry leading products,
such as LAN-XI, result from that role and
aid our existing and future customers to
improve their product quality, reliability
and time to market.
AEROACOUSTICS
A key task to achieve quieter, fuel-saving,
and low-emission aircraft designs is the
aeroacoustic test, which is furthermore
required by the authorities to meet more
demanding environmental requirements.
The progression of acoustic propagation
models requires any physical test data to
be more accurate and precise than ever.
Therefore, an increased channel count and
longer test preparation is needed. This
directly impacts the complexity of the
set-up. And because wind tunnel usage is
increasing, the available time slots to
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perform required
testing are limited. This demand
puts a lot of pressure on measurement
efficiency to cover as many configurations
as possible within the same timeframe –
with no room for error and re-testing.
Brüel & Kjær is one of the leading
partners for wind tunnel acoustic
measurements based on its wide range of
highly accurate and reliable microphones
1
1 // Surface microphones
enable the acquisition of
data in windtunnels or
inflight for a variety of
measurements, like
acoustic fatigue,
aerodynamic noise and
skin-pressure
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