{"id":11446,"date":"2021-04-30T09:04:21","date_gmt":"2021-04-30T07:04:21","guid":{"rendered":"https:\/\/www.akustikforschung.de\/?p=11446"},"modified":"2021-06-03T15:05:17","modified_gmt":"2021-06-03T13:05:17","slug":"untersuchungen-zur-schallimmissionsprognose-bei-tieffrequenten-geraeuschen","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/unternehmen\/fallstudien\/untersuchungen-zur-schallimmissionsprognose-bei-tieffrequenten-geraeuschen\/","title":{"rendered":"Investigation of sound immission prognosis of low-frequency noise"},"content":{"rendered":"<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-11467\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws-300x202.png\" alt=\"Investigation of sound immission prognosis of low-frequency noise - Numerically simulated natural frequencies of a room\" width=\"450\" height=\"303\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws-300x202.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws-640x431.png 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws-768x517.png 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/04\/eigenfrequenzen_raum_01_ws.png 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>The legitimate approval of facilities emitting low-frequency noise, such as cogeneration units (BHKW), typically requires to determine the maximum permitted noise emission values that comply with adequate certainty with the indicative values according to supplement\u00a01 of DIN\u00a045680:1997-03. For this purpose, no standardized method exists. According to the instructions for protection against noise (TA\u00a0L\u00e4rm) and DIN\u00a045680, low-frequency noise immissions have to be evaluated inside of closed rooms. Furthermore, standardized methods for calculating the sound propagagtion only predict the noise immission at points outside of buildings.<\/p>\n<p><!--contentpartdivider--><\/p>\n<h2>Low-frequency noise immissions<\/h2>\n<p>The characteristic of low-frequency noise immissions inside of rooms is influenced on the one hand by the properties of the separating constructional elements, such as frequencies of coincidence and natural frequencies. These frequencies mainly depend on the geometrical dimensions of the constructional element and on the material. In many cases, at low frequencies windows dominate the sound insulation. Windows operate as low-pass filters. On the other hand, besides the sound absorbing properties of the room setup, the natural frequencies (modes) of the receiving room have a strong influence on the amplitude and the distribution of the sound pressure inside the room.<\/p>\n<p>Therefore, the relevant parts of a reliable prognosis are:<\/p>\n<ul>\n<li>the knowledge of the spectral noise emission values (<a href=\"https:\/\/www.akustikforschung.de\/en\/know-how\/prufverfahren-nach-norm\/messung-schallleistung\/\">sound power<\/a>),<\/li>\n<li>the calculation of the <a href=\"https:\/\/www.akustikforschung.de\/en\/leistungen\/umweltakustik\/immissionsprognose\/schallausbreitung-an-hindernissen\/\">sound propagation<\/a> (energetic according to DIN\u00a0ISO\u00a09613-2 or coherent, e. g. according to Nord\u00a02000,<\/li>\n<li>the calculation of the <a href=\"https:\/\/www.akustikforschung.de\/en\/know-how\/prufverfahren-nach-norm\/schallabsorption-schalldaemmung\/\">sound insulation<\/a> of the separating outer and inner constructional elements (under consideration of natural frequencies and frequencies of coincidence), also depending on the angle of sound incidence as well as<\/li>\n<li>the calculation of the <a href=\"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/strukturanalyse\/fem-finite-elemente-methode\/\">eigenmodes<\/a> of a room in need of protection, also for complex geometries.<\/li>\n<\/ul>\n<h2>Measurements<\/h2>\n<p>The listed calculations are partially connected with a considerable effort as well as specific uncertainties, especially the two latter ones. Therefore, within a research project on behalf of the state office for the environment, agriculture and geology (LfULG), statistical results were gained. Based on measurements at 35 rooms representative for Saxony, sound pressure level differences between outside and inside were determined. These results allow to define a maximum sound pressure level outside which complies with the indicative values inside with adequate certainty.<\/p>\n<p>You can find the detailed investigation report here:<\/p>\n<p><a href=\"https:\/\/publikationen.sachsen.de\/bdb\/artikel\/37407\" target=\"_blank\" rel=\"noopener\">To publication of results of investigations<\/a><\/p>\n<p><a href=\"https:\/\/publikationen.sachsen.de\/bdb\/artikel\/37427\" target=\"_blank\" rel=\"noopener\">To publication of procedure for practical application<\/a><\/p>\n<p><a href=\"https:\/\/www.umwelt.sachsen.de\/download\/laerm_licht_mobilfunk\/01_Untersuchungen_zur_Schallimmissionsprognose_Huebelt.pdf\" target=\"_blank\" rel=\"noopener\">To presentation of AED at online conference of LfULG with the topic &#8220;Low-frequency noise &#8211; Current project results&#8221; from May, 7th 2021 &gt;&gt;<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>The legitimate approval of facilities emitting low-frequency noise, such as cogeneration units (BHKW), typically requires to determine the maximum permitted [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11453,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[650,651,184,659,47,657,64,65,658,582,96,297,584],"class_list":["post-11446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fallstudien","tag-din-45680","tag-din-en-9613-2","tag-eigenfrequenz","tag-geraeuschimmission","tag-messung","tag-raummode","tag-schallausbreitung","tag-schalldammung","tag-schalldruckpegeldifferenz","tag-schallimmissionsprognose","tag-schallleistung","tag-ta-larm","tag-tieffrequente-geraeusche","has-content-parts","content-parts-3"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Untersuchungen Schallimmissionsprognose 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