{"id":3353,"date":"2023-01-04T16:35:21","date_gmt":"2023-01-04T15:35:21","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/3-definitions-en-iso-3740\/"},"modified":"2023-07-24T15:22:59","modified_gmt":"2023-07-24T14:22:59","slug":"3-definitions-en-iso-3740","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/en-iso-3740\/3-definitions-en-iso-3740\/","title":{"rendered":"3 &#8211; Definitions"},"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                        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                            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>\n<p style=\"text-align: justify;\"><span style=\"text-align:justify;\"><strong>Emissione: <\/strong>suono aereo irradiato da una sorgente di rumore ben definita (es: il macchinario in esame) sotto specificate condizioni operative e di montaggio.<\/span><\/p>\n<p style=\"text-align: justify;\">&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong>Pressione Sonora (p):<\/strong>&nbsp; &egrave; la differenza tra la pressione instantanea e la pressione statica (&egrave; ci&ograve; che percepisce l&#39;orecchio umano).<\/p>\n<p style=\"text-align: justify;\"><strong>Livello di Pressione Sonora:&nbsp;<\/strong>dieci volte il logaritmo in base dieci del rapporto tra il quadrato della pressione sonora, p, di una sorgente e un valore di riferimento, P<sub>0<\/sub>&nbsp;(<span style=\"font-size:11pt\"><span style=\"line-height:107%\"><span style=\"font-family:Calibri,sans-serif\"><span style=\"font-size:11.0pt\"><span style=\"line-height:107%\"><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">= 20 <\/span><\/span><\/span><span style=\"font-size:12.0pt\"><span style=\"line-height:107%\">&micro;Pa<\/span><\/span><span style=\"font-size:11.0pt\"><span style=\"line-height:107%\"><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">)<\/span><\/span><\/span><\/span><\/span><\/span>,&nbsp;espresso in decibel (&egrave; la pressione sonora riportata sulla scala dei decibel):&nbsp;<\/p>\n<p style=\"margin: 0cm 0cm 8pt; text-align: center;\"><span style=\"font-size:11pt\"><span style=\"line-height:107%\"><span style=\"font-family:Calibri,sans-serif\"><span style=\"font-size:11.0pt\"><span style=\"line-height:107%\"><span style=\"font-family:&quot;Calibri&quot;,sans-serif\"><img decoding=\"async\" id=\"_x0000_i1025\" src=\"data:image\/png;base64,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\" style=\"width:94.9pt; height:32.25pt\" \/> <\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><strong>Potenza Sonora (P):&nbsp;<\/strong>attraverso una superficie, &egrave; il prodotto della pressione sonora, p, e la componente della velocit&agrave; delle particelle, u<sub>n<\/sub>, in un punto sulla superficie nella direzione normale alla superficie, integrata sopra quella superficie.<\/p>\n<p style=\"text-align: justify;\"><strong>Livello di Potenza Sonora (Lw):&nbsp;<\/strong>dieci volte il logaritmo in base dieci del rapporto tra la potenza sonora, P, di una sorgente e un valore di riferimento, P<sub>0<\/sub>&nbsp;(<span style=\"font-size:11pt\"><span style=\"line-height:107%\"><span style=\"font-family:Calibri,sans-serif\"><span style=\"font-size:11.0pt\"><span style=\"line-height:107%\"><span style=\"font-family:&quot;Calibri&quot;,sans-serif\">= 1 pW)<\/span><\/span><\/span><\/span><\/span><\/span>,&nbsp;espresso in decibel (&egrave; la potenza sonora riportata sulla scala dei decibel):&nbsp;<\/p>\n<p style=\"margin: 0cm 0cm 8pt; text-align: center;\"><span style=\"font-size:11pt\"><span style=\"line-height:107%\"><span style=\"font-family:Calibri,sans-serif\"><span style=\"font-size:11.0pt\"><span style=\"line-height:107%\"><span style=\"font-family:&quot;Calibri&quot;,sans-serif\"><img decoding=\"async\" id=\"_x0000_i1025\" 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style=\"width:90.4pt; height:30.4pt\" \/>&nbsp;<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><strong>Rumore di Fondo:&nbsp;<\/strong>rumore proveniente da tutte le sorgenti eccetto dalla sorgente di rumore sotto esame.<\/p>\n<p style=\"text-align: justify;\"><strong>Grado di Precisione:&nbsp;<\/strong>grado che caratterizza tre diverse classi di incertezza nel determinare il livello di potenza sonora in base alla deviazione standard della riproducibilit&agrave; del metodo.<\/p>\n<p style=\"text-align: justify;\"><strong>Incertezza delle misure:&nbsp;<\/strong>valore caratteristico che identifica un &quot;range&quot; attorno ai risultati della misura o di calcolo entro il quale una stima dei valori dovrebbe mentire.<\/p>\n<\/blockquote>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    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