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ACOUSTIC TEST FACILITIES
>> ANECHOIC ROOMS
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Anechoic rooms, such as hemi-anechoic rooms, or fully
anechoic rooms are created to simulate what is called a free field. A
free field is the representation of a theoretical infinite space, in
which no sound wave reflections, or echoes, take place. The boundaries
of anechoic rooms are lined with sound absorbent material in order to
achieve free-field conditions.
Compliance with free-field condition makes high demands on the acoustic
lining: it must yield absorption coefficients of more than 99% above a
certain lower cut-off frequency.
Anechoic test rooms require thorough and comprehensive planning which is
well coordinated with the utilisation of the room. Unfortunately, in the
field of acoustic test facilities even early in the planning process
mistakes are made over and over again that can prove costly later.
Inadequate room dimensions may lead to a restricted usability or a wrong
choice of acoustic lining to a poor performance of an expensive R&D
facility.
For example, measurements such as vehicle interior noise levels or
acoustic near-field measurements can be conducted in rooms applying a
space-saving compact lining system such as the PK combined
absorption-resonance-system (PK “CAR”-System), whereas free-field
measurements, e.g. vehicle pass-by noise tests, engine & exhaust pipe
measurements and narrow-band analysis in general require a more precise
room using a sound absorbent cube- or wedge-type lining system.
 The future of anechoic test facilities lies in tailor-made solutions
that exactly meet the clients’ individual needs. Unlike any other
company the Kapolnek GmbH has the sound experience of many years and
provides the full range of acoustic test facilities for ambitious
research & development purposes. Our products include a variety of all
common absorber types and absorbent material:
 porous absorbers: wedge or cube type systems
combined absorption-resonance system (CAR-system)
Both systems can be designed with mineral fibre absorbers or technical
foam.
In addition we offer complete equipment for acoustic test rooms, e.g.
vibration isolated mounting of the inner room of a double walled
construction (box-in-box construction)
room air-conditioning with low ambient noise levels
heating/cooling chambers for combined acoustic and material testing
complete vehicle cooling system with headwind blowers
spot coolers and exhaust gas extraction systems
sound retardant and fire resistant doors, gates and windows
non reflecting and noiseless lightening system
sound insulating cable sleeves
Based on our strong experience, we support our clients from the
feasibility stage, through design and development, and into the test
room operation and management. The results are high-quality and accurate
test facilities, delivered on time and budget. |
