{"id":1033,"date":"2012-07-27T09:52:12","date_gmt":"2012-07-27T09:52:12","guid":{"rendered":"https:\/\/www.akustik-forschung.de\/test\/?p=1033"},"modified":"2026-02-11T13:35:08","modified_gmt":"2026-02-11T12:35:08","slug":"stroemungswiderstand-porositaet","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/know-how\/prufverfahren-nach-norm\/stroemungswiderstand-porositaet\/","title":{"rendered":"Airflow resistance and porosity"},"content":{"rendered":"<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-5459 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws-300x225.jpg\" alt=\"Characterization of sound absorber by measurement of sound absorption coefficient, airflow resistance, porosity, tortuosity etc.\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws-300x225.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws-640x480.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws-440x330.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_schallabsorptionsgrad_buerostellwand_hallraum_01_ed_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Besides acoustic and mechanical parameters, the Gesellschaft f\u00fcr Akustikforschung Dresden mbH also determines specific parameters of acoustic, porous absorbers and materials for you.<\/p>\n<p>These properties can be applied as input parameters to different absorber models allowing the prediction and optimization of the sound-absorbing behavior.<\/p>\n<p>For this purpose, own developed measuring techniques and adapted calculation methods are available.<\/p>\n<p><!--contentpartdivider--><\/p>\n<h4>Measurement of the airflow resistivity, porosity etc.<\/h4>\n<ul>\n<li>determination of the airflow resistivity with <a href=\"https:\/\/www.akustikforschung.de\/produkte\/messgerate\/stromungswiderstandsmessgerat-aed-300-acoustiflow\/\">airflow resistivity meter AcoustiFlow<sup>\u00ae<\/sup><\/a> on the basis of the static-airflow method (direct-airflow method) described in DIN EN ISO 9053-1 (former DIN EN 29053); in the case of thin layers determination of specific airflow resistance, which allows the calculation of the sound absorption coefficient; alternatively, the flow resistance can be determined metrologically for laminar air flow in accordance with ASTM C522<\/li>\n<\/ul>\n<ul>\n<li>measurement of the gross density and the porosity (accessible void content) by volumetric method with gas pycnometer according to DIN 51913<\/li>\n<\/ul>\n<ul>\n<li>determination of the hydraulic tortuosity and the structure factor by measurement of the electrical tortuosity; in the case of electrical conductors by indirect calculation by using the frequency-dependent characteristic absorber values<\/li>\n<\/ul>\n<ul>\n<li>determination of the characteristic viscous lengths and the thermal lengths by indirect calculation by using the frequency-dependent characteristic absorber values<\/li>\n<\/ul>\n<ul>\n<li>tomography and polished cut images<\/li>\n<\/ul>\n<h4>Sound absorbers<\/h4>\n<p>Materials with sound absorbing properties are e. g.:<\/p>\n<ul>\n<li>synthetic materials (e. g. open-cell foams)<\/li>\n<li>glass wool, mineral wool<\/li>\n<li>granulates, fills<\/li>\n<li>felts, fibers<\/li>\n<li>perforated plates<\/li>\n<li>foils<\/li>\n<li>open porous asphalts and concretes<\/li>\n<li>elastomer compounds<\/li>\n<li><a title=\"metal fiber sound absorbers\" href=\"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/schallabsorber\/metallfaserabsorber\/\">metal fiber sound absorbers<\/a><\/li>\n<li><a title=\"metal hollow sphere structures\" href=\"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/schallabsorber\/metallische-hohlkugelstrukturen\/\">metal hollow sphere structures<\/a><\/li>\n<\/ul>\n<h4>Optimization of sound absorbers and mufflers<\/h4>\n<ul>\n<li>calculation of the sound propagation (sound absorption, sound reflexion, sound insulation) above layered absorbers by applying different absorber models (e. g. homogeneous model, phenomenological model) with <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/schallabsorber-software-aed-3001-acousticalc\/\">sound absorber software AcoustiCalc<sup>\u00ae\u00a0Absorber<\/sup><\/a><\/li>\n<\/ul>\n<ul>\n<li>prediction and optimization of the sound absorption in <a href=\"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/larmminderung\/auslegung-von-schalldampfern-2\/\">mufflers and silencers<\/a> as well as absorbent-lined ducts by both analytical models with <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/schalldampfer-software-aed-8001-acousticalc\/\">muffler software AcoustiCalc<sup>\u00ae\u00a0Silencer<\/sup><\/a> and by numerical calculation (see <a href=\"https:\/\/www.akustikforschung.de\/en\/know-how\/numerische-akustik\/fem-finite-elemente-methode\/\">FEM<\/a>)<\/li>\n<\/ul>\n<p><!--contentpartdivider--><\/p>\n<div id=\"attachment_5461\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5461\" class=\"wp-image-5461 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws-300x162.jpg\" alt=\"Potential sound absorbers, materials with open porosity\" width=\"300\" height=\"162\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws-300x162.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws-640x347.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws-440x238.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/materialien_04_ed_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-5461\" class=\"wp-caption-text\">Specimens of materials with open porosity<\/p><\/div>\n<p><div id=\"attachment_5462\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5462\" class=\"wp-image-5462 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws-300x181.jpg\" alt=\"Measurement of airflow resistance and porosity of sound absorbers\" width=\"300\" height=\"181\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws-300x181.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws-640x386.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws-440x265.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/stroemungsresistanz_porositaet_ed2_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-5462\" class=\"wp-caption-text\">Airflow resistivity of hollow metal sphere structures against porosity shown for different sphere diameters<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"<p>Besides acoustic and mechanical parameters, the Gesellschaft f\u00fcr Akustikforschung Dresden mbH also determines specific parameters of acoustic, porous absorbers and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5459,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[812,339,594,367,208,47,213,86,39,38,168,383,212,432,385],"class_list":["post-1033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prufverfahren-nach-norm","tag-astm-c522","tag-din-en-29053","tag-din-en-iso-9053-1","tag-festkorperdichte","tag-glaswolle","tag-messung","tag-porositat","tag-schallabsorber","tag-schallabsorption","tag-schallabsorptionsgrad","tag-schalldampfer","tag-stromungsresistanz","tag-stromungswiderstand","tag-strukturfaktor","tag-tortuositat","has-content-parts","content-parts-5"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Str\u00f6mungswiderstand, Porosit\u00e4t - Schallabsorber, Messung, 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