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 Bönnigheim.
The new acoustic test shows how much noise the human ear registers despite sound-absorbing textiles. ©Fotolia
Hohenstein scientists in the team working with Dr. Jan Beringer, in conjunction with Hochschule Reutlingen and Rökona Textilwerk GmbH in Tübingen, have developed innovative test methods to investigate the acoustic and aeroacoustic properties of textile materials.
Noise now pervades all parts of our everyday lives and is becoming an increasing source of stress. 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. Even sounds above 40 decibels corresponding approximately to soft radio music can produce these negative effects.
Therefore sound-absorbing textile materials are gaining popularity in the many sectors where sounds are perceived as unpleasant and disruptive. 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.
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 fabric to be tested is clamped in a sample holder between a loud speaker and a measuring microphone. One great benefit here is the small sample size as fabric samples measuring only 10 x 10 cm are large enough. Measurements are taken within a frequency spectrum of 200 – 20,000 Hz to ascertain the extent (decibels) to which the fabric attenuates/dampens the signal sent by the loudspeaker.
The aeroacoustic test determines the frequency spectra of the often disturbing background noise of textile air flow. The Hohenstein Institute test apparatus is able to investigate virtually all samples ranging from small laboratory samples up to complete components and can simulate wind speeds of up to 140 km/h.
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. This noise is then subject to computer analysis and the corresponding frequencies of the noise are determined. These resulting comparative figures then enable materials to be optimised for the most diverse of uses.
As well as capturing the aeroacoustic properties of textile fabrics, locally-triggered causes of air flow noises can also be determined. This knowledge can then be used to optimise textile s and components even more.Contacts:
Andrea Höra | idw
New gel-like coating beefs up the performance of lithium-sulfur batteries
22.03.2017 | Yale University
Pulverizing electronic waste is green, clean -- and cold
22.03.2017 | Rice University
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
22.03.2017 | Materials Sciences
22.03.2017 | Physics and Astronomy
22.03.2017 | Materials Sciences