{"id":27381,"date":"2022-06-23T14:45:49","date_gmt":"2022-06-23T13:45:49","guid":{"rendered":"https:\/\/www.imperalum.com\/considerations-generales\/"},"modified":"2022-06-23T14:46:55","modified_gmt":"2022-06-23T13:46:55","slug":"considerations-generales","status":"publish","type":"page","link":"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/considerations-generales\/","title":{"rendered":"Consid\u00e9rations G\u00e9n\u00e9rales"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"27381\" class=\"elementor elementor-27381 elementor-22882\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-277876ed elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"277876ed\" data-element_type=\"section\" data-e-type=\"section\" 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href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/affaiblissement-acoustique-de-revetements-de-sol-ou-systemes-de-plancher-flottant\/\" class=\"elementor-item\" tabindex=\"-1\">Affaiblissement Acoustique de Rev\u00eatements de Sol ou Syst\u00e8mes de Plancher Flottant<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-27539\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/transmission-laterale\/\" class=\"elementor-item\" tabindex=\"-1\">Transmission Lat\u00e9rale<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-27540\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/considerations-generales\/\" class=\"elementor-item\" tabindex=\"-1\">Consid\u00e9rations G\u00e9n\u00e9rales<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-27541\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/solutions-pour-la-correction-acoustique-despaces\/\" class=\"elementor-item\" tabindex=\"-1\">Solutions pour la correction acoustique d\u2019espaces<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-27542\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/materiaux-poreux\/\" class=\"elementor-item\" tabindex=\"-1\">Mat\u00e9riaux Poreux<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-27339\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/systemes-resonants\/\" class=\"elementor-item\" tabindex=\"-1\">Syst\u00e8mes R\u00e9sonants<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-28293\"><a href=\"https:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/solucoes-construtivas-imperalum\/\" class=\"elementor-item\" tabindex=\"-1\">Solu\u00e7\u00f5es Construtivas Imperalum<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-c9f0490\" data-id=\"c9f0490\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5443c01 elementor-widget elementor-widget-text-editor\" data-id=\"5443c01\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La dissipation d\u2019\u00e9nergie acoustique dans une enceinte s\u2019effectue, lorsque le champ acoustique \u00e9tabli est diffus (champ avec la m\u00eame densit\u00e9 acoustique sur chaque point de l\u2019espace), pour des conditions d\u2019incidence sur les \u00e9l\u00e9ments du contour dans toutes les directions. Cette dissipation d\u2019\u00e9nergie se traduit par le coefficient d\u2019absorption acoustique a du mat\u00e9riel sur lequel se produit l\u2019occurrence en cause, sachant que ce coefficient se d\u00e9finit, pour chaque fr\u00e9quence f, ou pour les bandes avec fr\u00e9quence centrale fc, par la relation suivante:<\/p><p>\u00a0<\/p><p><a href=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_11.gif\"><img decoding=\"async\" class=\"aligncenter wp-image-1724 size-full\" src=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_11.gif\" alt=\"considera\u00e7\u00f5es_1\" width=\"144\" height=\"75\" \/><\/a><\/p><p>Si le contour de l\u2019enceinte est constitu\u00e9 par des \u00e9l\u00e9ments de surface, Sn , de mat\u00e9riaux diff\u00e9rents, on d\u00e9finit le coefficient d\u2019absorption acoustique moyen, pour une fr\u00e9quence donn\u00e9e, ou une bande de fr\u00e9quences, par la formule:<\/p><p><a href=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_21.gif\"><img decoding=\"async\" class=\"aligncenter wp-image-1725 size-full\" src=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_21.gif\" alt=\"considera\u00e7\u00f5es_2\" width=\"146\" height=\"108\" \/><\/a><\/p><p>Lorsqu\u2019une source acoustique commence \u00e0 fonctionner dans un espace ferm\u00e9, la puissance acoustique qui est \u00e9mise est sup\u00e9rieure \u00e0 la puissance dissip\u00e9e autour et dans l\u2019air existant dans cet espace. Cette situation \u00e9volue vers un \u00e9tat permanent dans lequel la puissance acoustique de l\u2019\u00e9mission est \u00e9gale \u00e0 la puissance qui correspond \u00e0 la dissipation; dans le cas contraire, la valeur de la puissance acoustique dans l\u2019espace en question augmenterait ind\u00e9finiment.<\/p><p>D\u00e9s que l\u2019\u00e9galit\u00e9 mentionn\u00e9e est \u00e9tablie, la puissance dissip\u00e9e dans le contour est compos\u00e9e par deux parcelles, une due \u00e0 la premi\u00e8re incidence (champ acoustique directe), donn\u00e9e par\u00a0<strong>aW<\/strong>\u00a0\u2013 o\u00f9\u00a0<strong>W<\/strong>\u00a0repr\u00e9sente la puissance acoustique de la source \u2013 , et une autre due aux n r\u00e9flexions successives produite autour, de valeur<strong>\u00a0(1-aW),<\/strong>qui constitue le champ r\u00e9verb\u00e9r\u00e9.<br \/>Le niveau de pression acoustique peut \u00eatre calcul\u00e9 \u00e0 partir du niveau de puissance acoustique de la source<br \/><strong>Lw<\/strong>\u00a0, com factor de direccionalidade\u00a0<strong>D<\/strong>\u00a0e constante ac\u00fastica de espa\u00e7o\u00a0<strong>R<\/strong>.<\/p><p><a href=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_31.gif\"><img decoding=\"async\" class=\"aligncenter wp-image-1726 size-full\" src=\"https:\/\/imperalum.com\/cms\/wp-content\/uploads\/2014\/08\/considera\u00e7\u00f5es_31.gif\" alt=\"considera\u00e7\u00f5es_3\" width=\"268\" height=\"68\" \/><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Conceitos gerais de ac\u00fastica La dissipation d\u2019\u00e9nergie acoustique dans une enceinte s\u2019effectue, lorsque le champ acoustique \u00e9tabli est diffus (champ avec la m\u00eame densit\u00e9 acoustique sur chaque point de l\u2019espace), pour des conditions d\u2019incidence sur les \u00e9l\u00e9ments du contour dans toutes les directions. Cette dissipation d\u2019\u00e9nergie se traduit par le coefficient d\u2019absorption acoustique a du [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":27559,"menu_order":193,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-27381","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Consid\u00e9rations G\u00e9n\u00e9rales - Imperalum<\/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:\/\/www.imperalum.com\/fr\/solutions\/solutions-disolation-acoustique\/considerations-generales\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Consid\u00e9rations G\u00e9n\u00e9rales - Imperalum\" \/>\n<meta property=\"og:description\" content=\"Conceitos gerais de ac\u00fastica La dissipation d\u2019\u00e9nergie acoustique dans une enceinte s\u2019effectue, lorsque le champ acoustique \u00e9tabli est diffus (champ avec la m\u00eame densit\u00e9 acoustique sur chaque point de l\u2019espace), pour des conditions d\u2019incidence sur les \u00e9l\u00e9ments du contour dans toutes les directions. 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