{"id":11615,"date":"2022-10-04T15:29:50","date_gmt":"2022-10-04T15:29:50","guid":{"rendered":"https:\/\/gustafs.com\/?post_type=academy&#038;p=11615"},"modified":"2024-03-22T12:03:17","modified_gmt":"2024-03-22T11:03:17","slug":"about-sound-absorption-and-reverberation-times","status":"publish","type":"academy","link":"https:\/\/gustafs.com\/sv\/knowledge-hub\/akustik\/about-sound-absorption-and-reverberation-times\/","title":{"rendered":"Om ljudabsorbenter och efterklangstid"},"content":{"rendered":"\n<h1 class=\"wp-block-heading has-text-align-left\">Om ljudabsorbenter och efterklangstid<\/h1>\n\n\n\n<p><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">EUs ljudabsorbtionsklassificering (EN ISO 11654)<\/h5>\n\n\n\n<p>Ljudabsorptionskoefficienter m\u00e4ts enligt ISO 354. Den viktade ljudabsorptionskoefficienten&nbsp;(\u03b1w) och ljudabsorptionsklassen som visas i tabellen nedan har r\u00e4knats enligt ISO 11654.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>Absorptionsklass<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Viktad absorptions-koefficient<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Beskrivning<\/strong><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">A<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,90 \u2013 1,00<\/td><td class=\"has-text-align-left\" data-align=\"left\">Extremt absorberande<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">B<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,90 \u2013 0,85<\/td><td class=\"has-text-align-left\" data-align=\"left\">Extremt absorberande<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">C<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,60 \u2013 0,75<\/td><td class=\"has-text-align-left\" data-align=\"left\">I h\u00f6g grad absorberande<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">D<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,30 \u2013 0,55<\/td><td class=\"has-text-align-left\" data-align=\"left\">Absorberande<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">E<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,15 \u2013 0,25<\/td><td class=\"has-text-align-left\" data-align=\"left\">Knappt absorberande<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Ingen klass<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u03b1w 0,00 \u2013 0,10<\/td><td class=\"has-text-align-left\" data-align=\"left\">Reflekterande<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h5 class=\"wp-block-heading\">US  ljudabsorbtionsklassificering (ASTM 423)<\/h5>\n\n\n\n<p>NRC best\u00e4ms av ett v\u00e4rde som kommer fr\u00e5n medelv\u00e4rdet som uppn\u00e5s p\u00e5 f\u00f6ljande frekvenser: 250, 500, 1000 och 2000 Hz.&nbsp;Ungef\u00e4rlig \u00f6vers\u00e4ttning fr\u00e5n \u03b1w till NRC:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u03b1w<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>NRC<\/strong><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">A<\/td><td class=\"has-text-align-left\" data-align=\"left\">NRC &gt; 0,75<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">B<\/td><td class=\"has-text-align-left\" data-align=\"left\">NRC &gt; 0,75<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">C<\/td><td class=\"has-text-align-left\" data-align=\"left\">0,5 &lt; NRC &lt; 0,75<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">D<\/td><td class=\"has-text-align-left\" data-align=\"left\">0,5 &lt; NRC &lt; 0,75<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">E<\/td><td class=\"has-text-align-left\" data-align=\"left\">0,25 &lt; NRC &lt; 0,5<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">No Class<\/td><td class=\"has-text-align-left\" data-align=\"left\">NRC &lt; 0,25<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>OBS! genom att anv\u00e4nda produkter med exempelvis absorptionsklass B, resulterar inte per automatik att ett rum uppn\u00e5r akustikklass B. Hela rummet kan faktiskt klassas b\u00e5de h\u00f6gre eller l\u00e4gre.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-wide\"\/>\n\n\n\n<div style=\"height:1px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<section class=\"image-plus-text\">\n    <div class=\"container\">\n        <div class=\"row\">\n            \n            <div class=\"col-md-6 col-left col-text\">\n                                <div class=\"content-wrapper\">\n                                                                    <div class=\"content\">\n                                                        <div class=\"text font-13px\"><h4>Efterklangstid<\/h4>\n<p>Efterklangstid \u00e4r den tid som det tar f\u00f6r ett ljud att bli icke h\u00f6rbar, eller mer exakt tiden som det tar f\u00f6r ett ljud att reduceras med 60 dB. En l\u00e5ng efterklangstid kan upplevas som st\u00f6rande och g\u00f6r det sv\u00e5rt att uppfatta talljud, beh\u00e5lla koncentrationen och skapar stress.<\/p>\n<p>Genom att dubbla absorptionen s\u00e5 halveras efterklangstiden. Det kr\u00e4vs dubbelt s\u00e5 stor yta f\u00f6r en \u03b1=0,50 absorbent j\u00e4mf\u00f6rt med en \u03b1=1 absorbent att uppn\u00e5 samma efterklangstid.<\/p>\n<p>L\u00e5ga frekvenser har en l\u00e4ngre efterklangstid \u00e4n h\u00f6ga frekvenser. Olika typer av rum har \u00e4ven olika ideala efterklangstider:<\/p>\n<p><strong>Kyrka<\/strong>\u00a0 4 \u2013 8 sekunder<\/p>\n<p><b>Klassrum<\/b>\u00a0 0,6 sekunder<\/p>\n<p><strong>Kontor<\/strong>\u00a0 0,5 \u2013 0,8 sekunder<\/p>\n<p><strong>Konserthall<\/strong>\u00a0 2 sekunder<\/p>\n<\/div>\n                                                                                <\/div>\n                                    <\/div>              \n            <\/div>\n            \n            <div class=\"col-md-6 col-right col-image\">\n                                                        <div class=\"image \">\n                        <img decoding=\"async\"\n                            src=\"https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-645x810.png\"\n                            alt=\"\"\n                            srcset=\"https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-240x300.png 240w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-818x1024.png 818w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-768x962.png 768w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-720x900.png 720w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-645x810.png 645w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang-380x475.png 380w, https:\/\/gustafs.com\/wp-content\/uploads\/2022\/01\/diagram-efterklang.png 1030w\"\n                            sizes=\"\n                                                        (min-width: 1440px) 635px,\n                            (min-width: 1400px) 575px,\n                            (min-width: 1200px) 485px,\n                            (min-width: 992px) 395px,\n                            (min-width: 768px) 275px,\n                            100vw\n                                                        \"\n                        >\n                    <\/div>\n                                                                                            <div class=\"content-wrapper\">\n                                    <\/div>              \n            <\/div>\n            \n        <\/div>\n    <\/div>\n<\/section>\n\n\n\n<h4 class=\"wp-block-heading\">Tre faktorer som p\u00e5verkar efterklangstiden<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>1.&nbsp;Rummets volym. Ett stort rum betyder l\u00e4ngre efterklangstid.<\/li>\n\n\n\n<li>2. Ytorna i rummet. Fler absorberande ytor ger en kortare efterklangstid.<\/li>\n\n\n\n<li>3. Objekt i rummet. Mer f\u00f6rem\u00e5l i rummet resulterar i kortare efterklangstid.<\/li>\n<\/ul>\n\n\n\n<p>Den totala ljudabsorberande effekten av ytmaterialet i ett rum \u00e4r ett resultat av hur v\u00e4l materialet absorberar ljud, multiplicerat med den totala ytan som v\u00e4ggar och tak t\u00e4cker.<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":10614,"menu_order":151,"template":"","class_list":["post-11615","academy","type-academy","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Om ljudabsorbenter och efterklangstid | Gustafs Scandinavia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gustafs.com\/sv\/knowledge-hub\/akustik\/about-sound-absorption-and-reverberation-times\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Om ljudabsorbenter och efterklangstid | Gustafs Scandinavia\" \/>\n<meta property=\"og:description\" content=\"Om ljudabsorbenter och efterklangstid EUs ljudabsorbtionsklassificering (EN ISO 11654) Ljudabsorptionskoefficienter m\u00e4ts enligt ISO 354. 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