{"id":895,"date":"2012-07-25T18:33:35","date_gmt":"2012-07-25T18:33:35","guid":{"rendered":"https:\/\/www.akustik-forschung.de\/test\/?p=895"},"modified":"2025-03-07T16:33:08","modified_gmt":"2025-03-07T15:33:08","slug":"auslegung-von-schalldaempfer","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/schalldampfer\/auslegung-von-schalldaempfer\/","title":{"rendered":"Design of silencers and mufflers"},"content":{"rendered":"<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/03\/schiffsschalldaempfer_fertigung.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-12363\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/03\/schiffsschalldaempfer_fertigung.jpg\" alt=\"Ship silencer\" width=\"300\" height=\"207\" \/><\/a><\/p>\n<p>In general, mufflers are used for the attenuation of airborne sound in ducts without essential influence and interference of the medium streaming through the duct.<\/p>\n<p>On the basis of theoretical considerations, the Gesellschaft f\u00fcr Akustikforschung Dresden mbH deals with the design, development and the testing of specific mufflers adapted to devices and machines.<\/p>\n<p><!--contentpartdivider--><\/p>\n<h4>Fields of application of silencers and mufflers<\/h4>\n<p>Examples for the wide range of applications of mufflers are:<\/p>\n<ul>\n<li>combustion engines, e.g. in\n<ul>\n<li>road and rail vehicles<\/li>\n<li>chain saws, lawn mowers<\/li>\n<li>emergency power supplies, cogeneration units<\/li>\n<li>vacuum cleaners, leaf blowers<\/li>\n<\/ul>\n<\/li>\n<li>power plant facilities<\/li>\n<\/ul>\n<ul>\n<li>turbo chargers for diesel engines of ships<\/li>\n<\/ul>\n<h4>Classification of silencers and mufflers<\/h4>\n<p>Mufflers can be characterized and classified in various manners. One possibility is the classification in passive, active and hybrid mufflers, depending on their working principle.<\/p>\n<p>Passive mufflers are named by the fact, that only passive elements, e.g. sound absorbing materials and changing cross sections in the duct achieve the sound attenuation. In contrast to that, active mufflers (active noise control, ANC) are based on the application of additional sound sources, that are supposed to prevent the propagation of noise by interference.<\/p>\n<p>The effect of hybrid mufflers is caused by a combination of both working principles. Classifications with respect to the design, e.g. baffle silencer, are also commonly used.<\/p>\n<h4>Design and optimization of silencers and mufflers<\/h4>\n<p>Emphasis of our services are the design, the calculation and the optimization of locally-absorbent und laterally-absorbent, passive mufflers. In cooperation with the Fraunhofer Institut f\u00fcr Fertigungstechnik und Angewandte Materialforschung, for instance, we apply hollow metal sphere structures as self-supporting sound absorbers being potentially suitable to mufflers.<\/p>\n<p>For the design various analystical models (see <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/schalldaempfer-software-acousticalc-silencer\/\">AcoustiCalc<sup>\u00ae Silencer<\/sup><\/a> sowie <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/absorptionsschalldaempfer-software\/\">AcoustiCalc<sup>\u00ae Silencer light<\/sup><\/a>) and numerical calculations are applied (see <a href=\"https:\/\/www.akustikforschung.de\/en\/know-how\/numerische-akustik\/fem-finite-elemente-methode\/\">FEM<\/a>).<\/p>\n<p>The innovative measuring system <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/messgerate\/schalldaempfer-pruefstand-acoustitube-hightemp\/\">AcoustiTube<sup>\u00ae HighTemp<\/sup><\/a> allows the measurement of the transmission loss of mufflers in situ for temperatures up to 600\u00b0C. The measurement results can be processed further using the software <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/absorptionsschalldaempfer-software\/\">AcoustiCalc<sup>\u00ae Silencer<\/sup><\/a>, e.g. to calculate the effectiveness of a complete duct system.<\/p>\n<p>Furthermore, the available measuring equipment and specially developed test benches allow the determination of the insertion loss of mufflers in situ and in the laboratory according to DIN EN ISO 7235, DIN EN ISO 11820 and DIN EN ISO 11691.<\/p>\n<p><!--contentpartdivider--><\/p>\n<div id=\"attachment_2208\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2208\" class=\"wp-image-2208 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03-300x224.jpg\" alt=\"Turbo charger muffler of a ship's diesel engine\" width=\"300\" height=\"224\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03-300x224.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03-640x479.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03-317x238.jpg 317w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03-440x329.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/schalldaempfer_03.jpg 739w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2208\" class=\"wp-caption-text\">Muffler for a turbo charger of a ship`s diesel engine<\/p><\/div>\n<div id=\"attachment_4711\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4711\" class=\"wp-image-4711 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws-300x213.jpg\" alt=\"Optimization of transmission loss of parallel baffle muffler\" width=\"300\" height=\"213\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws-300x213.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws-640x454.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws-440x312.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/02\/analytische_berechnung_schalldaempfer_02_ed2_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-4711\" class=\"wp-caption-text\">Specific transmission loss of a locally-absorbent slotted silencer shown for different depths of lining in dependency of the frequency parameter Eta<\/p><\/div>\n<div id=\"attachment_9552\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2017\/06\/numerische_berechnung_schalldaempfer_15_ed_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9552\" class=\"wp-image-9552 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2017\/06\/numerische_berechnung_schalldaempfer_15_ed_ws-300x154.png\" alt=\"Acoustic design and optimization of a muffler by numerical FEM calculation\" width=\"300\" height=\"154\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2017\/06\/numerische_berechnung_schalldaempfer_15_ed_ws-300x154.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2017\/06\/numerische_berechnung_schalldaempfer_15_ed_ws-440x225.png 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2017\/06\/numerische_berechnung_schalldaempfer_15_ed_ws.png 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-9552\" class=\"wp-caption-text\">Numerical calculation of spectral insertion loss of parallel baffle muffler by application of Finite-Element-Method (<a href=\"https:\/\/www.akustikforschung.de\/en\/unternehmen\/know-how\/anwendungssoftware\/fem-finite-elemente-methode\/\">FEM<\/a>)<\/p><\/div>\n<p><div id=\"attachment_11828\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2023\/03\/aed1400_08_ws_muffler_test_setup-1.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11828\" class=\"wp-image-11828 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2023\/03\/aed1400_08_ws_muffler_test_setup-1-300x452.png\" alt=\"Test setup for mufflers AcoustiTube&lt;sup&gt;\u00ae HighTemp&lt;\/sup&gt; with accessories for measurement of transmission loss of exhaust silencer at near-operating conditions\" width=\"300\" height=\"452\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2023\/03\/aed1400_08_ws_muffler_test_setup-1-300x452.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2023\/03\/aed1400_08_ws_muffler_test_setup-1.png 531w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-11828\" class=\"wp-caption-text\">Measurement of the spectral sound absorption of an exhaustion muffler <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/messgerate\/schalldaempfer-pruefstand-acoustitube-hightemp\/\">AcoustiTube<sup>\u00ae HighTemp<\/sup><\/a> at temperatures up to 600 \u00b0C<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"<p>In general, mufflers are used for the attenuation of airborne sound in ducts without essential influence and interference of the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":12364,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[540],"tags":[396,397,85,398,399,395,228,227,226,229,181,225,224,220,223,216,221,49,254,169,218,64,246,158,176],"class_list":["post-895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-schalldampfer","tag-aktive-larmminderung","tag-anc","tag-auslegung","tag-auslegung-von-schalldampfern","tag-berechnung-von-schalldampfern","tag-blockheizkraftwerk","tag-din-en-iso-11691","tag-din-en-iso-11820","tag-din-en-iso-7235","tag-durchgangsdampfung","tag-einfugungsdampfung","tag-fem","tag-finite-elemente-methode","tag-hybrid","tag-hybridschalldampfer","tag-kanal","tag-kulissenschalldampfer","tag-luftschall","tag-messtechnik","tag-optimierung","tag-passiv","tag-schallausbreitung","tag-schiene","tag-turbolader","tag-verbrennungsmotor","has-content-parts","content-parts-5"],"yoast_head":"<!-- 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