{"id":39897,"date":"2023-01-04T16:35:21","date_gmt":"2023-01-04T15:35:21","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=39897"},"modified":"2023-07-24T15:24:01","modified_gmt":"2023-07-24T14:24:01","slug":"3-definition","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-en-iso\/en-iso-3740-determination-du-niveau-de-puissance-acoustique\/3-definition\/","title":{"rendered":"3 &#8211; D\u00e9finition"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9 float-left mr-6 md:mr-4 lg:mr-8 xl:mr-9  overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/3-Definitions-150x150.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"196\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/3-Definitions-300x196.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"501\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/3-Definitions-768x501.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 800px)\"\r\n                                width=\"800\"\r\n                                height=\"522\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/3-Definitions.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/3-Definitions.jpg.webp\"\r\n                                                        title=\"3 &#8211; Definitions\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <blockquote><p><strong>\u00c9mission<\/strong> : son a\u00e9rien \u00e9mis par une source de bruit bien d\u00e9finie (par exemple, la machine \u00e9tudi\u00e9e) dans des conditions de fonctionnement et de montage sp\u00e9cifi\u00e9es.<\/p>\n<p><strong>Pression acoustique (p)<\/strong> : diff\u00e9rence entre la pression instantan\u00e9e et la pression statique (c&rsquo;est ce que l&rsquo;oreille humaine per\u00e7oit).<\/p>\n<p><strong>Niveau de pression acoustique :<\/strong> dix fois le logarithme en base dix du rapport entre le carr\u00e9 de la pression acoustique, p, d&rsquo;une source et une valeur de r\u00e9f\u00e9rence, P0 (= 20 \u00b5Pa), exprim\u00e9 en d\u00e9cibels (c&rsquo;est la pression acoustique sur l&rsquo;\u00e9chelle des d\u00e9cibels) :<\/p>\n<p>Lp = 10lg (p^2\/po^2)dB<\/p>\n<p><strong>Puissance acoustique (P)<\/strong> : \u00e0 travers une surface, c&rsquo;est le produit de la pression acoustique, p, et de la composante de vitesse des particules, un, en un point de la surface dans la direction normale \u00e0 la surface, int\u00e9gr\u00e9e au-dessus de cette surface.<\/p>\n<p><strong>Niveau de puissance acoustique (Lw)<\/strong> : dix fois le logarithme en base dix du rapport entre la puissance acoustique, P, d&rsquo;une source et une valeur de r\u00e9f\u00e9rence, P0 (= 1 pW), exprim\u00e9 en d\u00e9cibels (il s&rsquo;agit de la puissance acoustique sur l&rsquo;\u00e9chelle des d\u00e9cibels) :<\/p>\n<p>Lw = 10lg P\/Po dB<\/p>\n<p><strong>Bruit de fond :<\/strong> bruit provenant de toutes les sources \u00e0 l&rsquo;exception de la source de bruit \u00e9tudi\u00e9e.<\/p>\n<p><strong>Degr\u00e9 de pr\u00e9cision<\/strong> : degr\u00e9 caract\u00e9risant trois classes diff\u00e9rentes d&rsquo;incertitude dans la d\u00e9termination du niveau de puissance acoustique sur la base de l&rsquo;\u00e9cart type de la reproductibilit\u00e9 de la m\u00e9thode.<\/p>\n<p><strong>Incertitude de mesure<\/strong> : valeur caract\u00e9ristique qui identifie un \u00ab\u00a0intervalle\u00a0\u00bb autour des r\u00e9sultats de mesure ou de calcul dans lequel une estimation des valeurs devrait se situer.<\/p><\/blockquote>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>Quelques d\u00e9finitions pour mieux comprendre la norme<\/p>\n","protected":false},"author":182,"featured_media":39982,"parent":38459,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[164],"class_list":["post-39897","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-en-iso"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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