{"id":2574,"date":"2024-08-04T18:58:52","date_gmt":"2024-08-04T16:58:52","guid":{"rendered":"https:\/\/jureknawrocki.com\/?p=2574"},"modified":"2026-03-14T08:06:32","modified_gmt":"2026-03-14T07:06:32","slug":"zjawisko-zmeczenia-akustycznego-avi","status":"publish","type":"post","link":"https:\/\/jureknawrocki.com\/en\/zjawisko-zmeczenia-akustycznego-avi\/","title":{"rendered":"Acoustic Induced Vibration (AIV)"},"content":{"rendered":"<p>This type of fatigue is a phenomenon that should also be taken into account in pipelines, although it is most often associated with aviation technology. It primarily concerns process pipelines with large diameters greater than 250 with very high medium flow rates. The pressure drop on local resistances is proportional to the square of the speed, so at high speeds, very high high-frequency noise also appears due to their existence. It translates into circumferential vibrations of small amplitude but high frequency. As a consequence of this phenomenon (Acoustic Inducted Vibration AIV), the fatigue reserve of the pipeline material is quickly exhausted. The most vulnerable are flare pipelines, turbocompressor safety valves, locations of cross-sectional narrowings such as control valve heads, welded pipeline elements such as tees, weldolets and supports.<\/p>\n\n\n\n<p>In the 1980s, Carrucci and Muller proposed a method for assessing the susceptibility of pipelines to AIV fatigue, which has been widely published. One of the main elements is a graph (valid only for a specific type of steel) estimating the range of safe operation of pipelines. It should be noted that according to it, the occurrence of the AVI phenomenon can be said to occur above 150 dB of acoustic power and for diameters greater than DN 250. This does not mean that in the case of a specific installation, the costs of which can be enormous for an emergency shutdown, these two boundary conditions should not be significantly reduced. As always, this depends on the knowledge and experience of the designer.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"537\" height=\"601\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-1-1.webp\" alt=\"\" class=\"wp-image-2563\" style=\"width:537px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-1-1.webp 537w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-1-1-480x537.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 537px, 100vw\" \/><\/figure>\n\n\n\n<p><br>The whole problem is in correctly determining the value of the internal pressure of the acoustic wave generated inside the pipeline during the AIV phenomenon.<\/p>\n\n\n\n<p>Below is a simple simulation of acoustic fatigue. This is a section of a pipeline fixed at both ends and subjected to internal pressure. The reduced stress in the pipeline sections varies with frequency. It has a maximum value at 1240 Hz.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"419\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-3-1.webp\" alt=\"\" class=\"wp-image-2565\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-3-1.webp 605w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-3-1-480x332.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 605px, 100vw\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"601\" height=\"409\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-4-1.webp\" alt=\"\" class=\"wp-image-2566\" style=\"width:601px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-4-1.webp 601w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-4-1-480x327.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 601px, 100vw\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"419\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-2-1.webp\" alt=\"\" class=\"wp-image-2564\" style=\"width:605px;height:auto\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-2-1.webp 605w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-2-1-480x332.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 605px, 100vw\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"779\" height=\"291\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-5-1.webp\" alt=\"\" class=\"wp-image-2567\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-5-1.webp 779w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-5-1-480x179.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 779px, 100vw\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"327\" height=\"178\" src=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-6-1.webp\" alt=\"\" class=\"wp-image-2568\" srcset=\"https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-6-1.webp 327w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-6-1-300x163.webp 300w, https:\/\/jureknawrocki.com\/wp-content\/uploads\/AVI-6-1-18x10.webp 18w\" sizes=\"(max-width: 327px) 100vw, 327px\" \/><\/figure>\n\n\n\n<p><br><\/p>","protected":false},"excerpt":{"rendered":"<p>Tego typu zm\u0119czenie jest zjawiskiem, kt\u00f3ry nale\u017cy bra\u0107 pod uwag\u0119 tak\u017ce w ruroci\u0105gach, cho\u0107 najcz\u0119\u015bciej jest ono kojarzone z technik\u0105 lotnicz\u0105. Dotyczy ono przed wszystkim ruroci\u0105g\u00f3w procesowych o du\u017cych \u015brednicach wi\u0119kszych ni\u017c 250 o bardzo du\u017cej pr\u0119dko\u015bci przep\u0142ywu medium. Spadek ci\u015bnienia na oporach miejscowych s\u0105 proporcjonalne do kwadratu pr\u0119dko\u015bci, wiec przy du\u017cych pr\u0119dko\u015bciach pojawia si\u0119 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":2565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[123,15],"tags":[32,16],"class_list":["post-2574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-obliczenia-wytrzymalosciowe-rur-i-aparatow","category-projekty","tag-mes","tag-naprezenia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Zjawisko zm\u0119czenia akustycznego - AVI - Jerzy Nawrocki<\/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:\/\/jureknawrocki.com\/en\/zjawisko-zmeczenia-akustycznego-avi\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Zjawisko zm\u0119czenia akustycznego - AVI - Jerzy Nawrocki\" \/>\n<meta property=\"og:description\" content=\"Tego typu zm\u0119czenie jest zjawiskiem, kt\u00f3ry nale\u017cy bra\u0107 pod uwag\u0119 tak\u017ce w ruroci\u0105gach, cho\u0107 najcz\u0119\u015bciej jest ono kojarzone z technik\u0105 lotnicz\u0105. Dotyczy ono przed wszystkim ruroci\u0105g\u00f3w procesowych o du\u017cych \u015brednicach wi\u0119kszych ni\u017c 250 o bardzo du\u017cej pr\u0119dko\u015bci przep\u0142ywu medium. 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