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The extent to which a textile material has a sound-absorbing effect and which are the noises that cause wind flow, can now be investigated using acoustic test apparatus at the Hohenstein Institute in Bonnigheim. Noise now pervades all parts of our everyday lives and is becoming an increasing source of stress.
Therefore sound-absorbing textile materials are gaining popularity in the many sectors where sounds are perceived as unpleasant and disruptive. For instance, sound-absorbing ceilings, partitions, floors and furniture surfaces in public facilities, open-plan offices and exhibition halls as well as technical textiles in vehicle interior linings are all effective measures to counter acoustic disturbances.
During the testing process at the Hohenstein Institute different textile materials are investigated with the acoustic measuring device. The aeroacoustic test determines the frequency spectra of the often disturbing background noise of textile air flow. The textile or component is exposed to air flow and a special measurement microphone is then used to record the noise caused by the air flow. As well as capturing the aeroacoustic properties of textile fabrics, locally-triggered causes of air flow noises can also be determined. If some rest is needed after a fast ride, a noise-optimised soft-top provides more comfort and offers protection against annoying wind and driving noise.

The new acoustic test shows how much noise the human ear registers despite sound-absorbing textiles.
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Jan Beringer, in conjunction with Hochschule Reutlingen and Rokona Textilwerk GmbH in Tubingen, have developed innovative test methods to investigate the acoustic and aeroacoustic properties of textile materials.
In addition to the negative effects on the nervous system, studies have shown that it diminishes concentration ability by about 20-30 percent, reduces work performance, increases accident risks and above all decreases feelings of comfort. It is primarily in the interior design and automotive sectors where specifically adapted materials are used to minimise and optimise noises leading to a rise in acoustic comfort. The fabric to be tested is clamped in a sample holder between a loud speaker and a measuring microphone.

This noise is then subject to computer analysis and the corresponding frequencies of the noise are determined. It’s got a built-in stand for operating in landscape mode or even in typing mode, this lets you use your tablet comfortably to type documents such as emails, homework or even class notes. When you use bulk rates, a flat $1.70 registered air mail fee will automatically be added to your cart to ensure delivery of package. Even sounds above 40 decibels corresponding approximately to soft radio music can produce these negative effects. One great benefit here is the small sample size as fabric samples measuring only 10 x 10 cm are large enough.
These resulting comparative figures then enable materials to be optimised for the most diverse of uses.
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04.11.2015 admin

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