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. 2019 Feb 12;19(3):738. doi: 10.3390/s19030738

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© 2019 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Ignot bio- acoustic sandwich panel (a) bio-acoustic sandwich panel before acoustic measurement (b) bio-acoustic sandwich panel during the acoustic absorption test with closed edges; (c): Knitting/tailor process of the lignocellulosic biocomposite layers before being fixed on the biofoam core, Photo: Subaciute and Stankaityte, BioMat-ITKE/University of Stuttgart; (d) Compilation of the measured sound absorption grades dependent on the frequency, as well as the evaluated sound absorption grades of the Ignot sandwich elements from variants zero to one.

Ignot bio- acoustic sandwich panel (a) bio-acoustic sandwich panel before acoustic measurement (b) bio-acoustic sandwich panel during the acoustic absorption test with closed edges; (c): Knitting/tailor process of the lignocellulosic biocomposite layers before being fixed on the biofoam core, Photo: Subaciute and Stankaityte, BioMat-ITKE/University of Stuttgart; (d) Compilation of the measured sound absorption grades dependent on the frequency, as well as the evaluated sound absorption grades of the Ignot sandwich elements from variants zero to one.