{"id":3352,"date":"2023-01-04T16:35:18","date_gmt":"2023-01-04T15:35:18","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/4-sound-power-level\/"},"modified":"2023-07-24T15:34:25","modified_gmt":"2023-07-24T14:34:25","slug":"4-sound-power-level","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/en-iso-3740\/4-sound-power-level\/","title":{"rendered":"4 &#8211; Sound Power Level"},"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                    <div class=\"mb-6 relative w-full md:mb-4 lg:mb-8 xl:mb-9\">\n                \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h4 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Introduction    <\/h4>\n        <\/div>\n                <\/div>\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\/4-Sound-Power-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=\"169\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/4-Sound-Power-300x169.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=\"432\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/4-Sound-Power-768x432.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"576\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/4-Sound-Power-1024x576.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\/4-Sound-Power.jpg.webp\"\r\n                                                        title=\"4 &#8211; Sound Power\"\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    <p>Given certain installation and operating conditions, the sound power level characterises the average flow of airborne acoustic energy emitted by the source into the environment. It characterises an intrinsic property of the source that is independent of the environment in which it is installed.<\/p>\n<p>This value is often referred to as the &#8220;A&#8221; weighted sound power level, which is the most commonly used frequency weighting that gives results indicated as dB(A), very close to the response of the human ear.<\/p>\n<p>&nbsp;<\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n\n\n\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:flex-row\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9  md:pl-12 xl:pl-24\"\n                >\n                    \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h4 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Determination of the Sound Power Level    <\/h4>\n        <\/div>\n    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>The sound power level\u00a0<strong>can&#8217;t<\/strong>\u00a0be measured directly with instruments. This value can only be\u00a0<strong>calculated<\/strong>\u00a0using those sound&#8217;s parameters that can be fisically measured.<\/p>\n<p>These parameters are the\u00a0<strong>sound pressure<\/strong>, the\u00a0<strong>sound intensity<\/strong>\u00a0and the\u00a0<strong>vibrations<\/strong>\u00a0caused from an acoustic source.<\/p>\n<p>The standards mentioned in the EN ISO 3740 all use different roads to arrive at the same destination which is the determination of the sound power level: the standards\u00a0<strong>ISO 9614-1<\/strong>\u00a0and\u00a0<strong>-3<\/strong>\u00a0estimate the acoustic energly flow relying on sound intensity measurements, the standards\u00a0<strong>ISO\/TS 7849-1<\/strong>\u00a0and\u00a0<strong>-2<\/strong>\u00a0take advantage of the vibrations produced by an acoustic source while the set of standards\u00a0<strong>ISO 374X<\/strong>\u00a0(except the ISO 3740) uses sound pressure values measured in specific positions around the test source.<\/p>\n<p>Using these last stardards (ISO 374X) it has to be considered that the sound pressure level measurements will be influenced from the\u00a0<strong>background noise<\/strong>\u00a0and from the\u00a0<strong>environment<\/strong>\u00a0in which test are realized so the standards introduce the correcttion factors\u00a0<strong>K<sub>1<\/sub><\/strong>\u00a0and\u00a0<strong>K<sub>2<\/sub><\/strong>\u00a0to consider this aspect.<\/p>\n<p>&nbsp;<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n        \n    <\/div>\n        <\/section>\n\n    \n\n\n\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:flex-row\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9  md:pl-12 xl:pl-24\"\n                >\n                    \n        <div                class=\"m-headings\"\n            >\n    \n    \n<h4 class=\"a-heading text-left text-primary font-heading text-2xl lg:text-3xl xl:text-4xl font-normal mt-2 first:mt-0\">\n                    Accuracy Classes    <\/h4>\n        <\/div>\n    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>For the set of basic international standards described in the EN ISO 3740,\u00a0<strong>three<\/strong>\u00a0different classes of accuracy grades define the quality of the determined sound power level value. These classes are:<\/p>\n<ul>\n<li>Accuracy grade 1, called\u00a0<strong>precision grade<\/strong>;<\/li>\n<li>Accuracy grade 2, called\u00a0<strong>engineering grade<\/strong>;<\/li>\n<li>Accuracy grade 3, called\u00a0<strong>survey grade<\/strong>.<\/li>\n<\/ul>\n<p>For most uses, the application of methods providing engineering grade (grade 2) results is expected to be satisfactory.<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n        \n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>&#8230;<\/p>\n","protected":false},"author":1,"featured_media":39990,"parent":3234,"menu_order":1,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[57],"class_list":["post-3352","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-en-iso-standards"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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