{"id":1129,"date":"2012-07-27T14:03:19","date_gmt":"2012-07-27T14:03:19","guid":{"rendered":"https:\/\/www.akustik-forschung.de\/test\/?p=1129"},"modified":"2021-03-08T08:56:29","modified_gmt":"2021-03-08T07:56:29","slug":"ursachen-der-larmentstehung","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/leistungen\/maschinenakustik\/larmminderung\/ursachen-der-larmentstehung\/","title":{"rendered":"Sources of noise generation"},"content":{"rendered":"<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_kuehlaggregat_01_G_ed2_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-4827 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_kuehlaggregat_01_G_ed2_ws-300x313.jpg\" alt=\"Analysis of noise generation by machines and devices\" width=\"300\" height=\"313\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_kuehlaggregat_01_G_ed2_ws-300x313.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_kuehlaggregat_01_G_ed2_ws-440x459.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/messung_kuehlaggregat_01_G_ed2_ws.jpg 574w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Before the noise of machines, vehicles and others can be reduced systematically, it is necessary to know the effects and mechanisms that are responsible for the\u00a0generation of noise. Noise,\u00a0caused by machines, can have different reasons.<\/p>\n<p><!--contentpartdivider--><\/p>\n<h4>Noise generation by machines<\/h4>\n<p>This includes among other things:<\/p>\n<ul>\n<li>fluid mechanical effects (especially in turbo-machines), like cavitation, vortex shedding or unsteady flows that can cause pipeline vibrations, narrow-band or tonal noise and increased wear of material<\/li>\n<li>machine dynamical effects (especially in rotating and oscillating machines) that result in mechanical oscillations<\/li>\n<li>vibrations that are perceptible as low-frequency oscillations<\/li>\n<\/ul>\n<p>Examples for machines that are\u00a0potentially in need of noise reduction are:<\/p>\n<ul>\n<li>turbo-machines like turbo chargers, compressors, ventilation\u00a0systems, fans, pumps, vacuum cleaners<\/li>\n<li>power tools and machine tools like lathes, drilling and milling\u00a0machines, punching machines, sawing machines, pneumatic hammers<\/li>\n<li>construction machinery and\u00a0vehicle components like cranes, excavators, tractors<\/li>\n<li>placement machines and production machinery<\/li>\n<\/ul>\n<p><!--contentpartdivider--><\/p>\n<div id=\"attachment_4829\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/emmissionspegelspektrum_turbine_ed_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-4829\" class=\"wp-image-4829 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/emmissionspegelspektrum_turbine_ed_ws-300x281.jpg\" alt=\"Measurement of noise emission of machines\" width=\"300\" height=\"281\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/emmissionspegelspektrum_turbine_ed_ws-300x281.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/emmissionspegelspektrum_turbine_ed_ws-440x413.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2012\/07\/emmissionspegelspektrum_turbine_ed_ws.jpg 639w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-4829\" class=\"wp-caption-text\">Emission spectra of a turbine shown for different numbers of revolutions<\/p><\/div>\n<p><div id=\"attachment_9280\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9280\" class=\"wp-image-9280 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws-300x221.jpg\" alt=\"Investigation of airborne and structure-borne noise with multi-channel measuring system at a power plant turbine\" width=\"300\" height=\"221\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws-300x221.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws-640x471.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws-440x324.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2015\/07\/messung_kraftwerk_01_ed_ws.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-9280\" class=\"wp-caption-text\">Analysis of sources of noise generation and noise emission by means of multi-channel measurements at a turbine of a power plant<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"<p>Before the noise of machines, vehicles and others can be reduced systematically, it is necessary to know the effects and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4827,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[166,157,165,152,501,408,94,156,161,494,155,167,158,160,159,154],"class_list":["post-1129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-larmminderung","tag-baumaschine","tag-erschutterung","tag-larm","tag-larmentstehung","tag-larmminderung","tag-larmminderungsbedurftig","tag-maschine","tag-oszillation","tag-pumpe","tag-schwingung","tag-stromung","tag-turbine","tag-turbolader","tag-ventilator","tag-verdichter","tag-wirbelablosung","has-content-parts","content-parts-5"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - 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