{"id":173,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/nodal-point\/"},"modified":"2026-05-23T23:04:34","modified_gmt":"2026-05-23T23:04:34","slug":"nodal-point","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/nb\/glossary\/nodal-point\/","title":{"rendered":"Hva er et nodalpunkt i rotorvibrasjon?"},"content":{"rendered":"<h1>Forst\u00e5 nodepunkter i rotorvibrasjon<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A komplett sett med b\u00e6rbart balanseapparat og vibrasjonsanalysator\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-1\/\" title=\"B\u00e6rbart balanseapparat og vibrasjonsanalysator Balanset-1A\">B\u00e6rbart balanseapparat og vibrasjonsanalysator Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,975.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Legg i handlekurv: \u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abPortable balancer &amp; Vibration analyzer Balanset-1A\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A vibrasjonssensor i n\u00e6rbilde\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/vibration-sensor\/\" title=\"Vibrasjonssensor\">Vibrasjonssensor<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>90.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Legg i handlekurv: \u00abVibration sensor\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abVibration sensor\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Optisk sensor (lasertakometer)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optisk sensor (lasertakometer)\">Optisk sensor (lasertakometer)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>124.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Legg i handlekurv: \u00abOptical Sensor (Laser Tachometer)\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abOptical Sensor (Laser Tachometer)\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera rotorbalanseringssett: b\u00e6reveske, flerkanals signalbehandler, h\u00e5ndholdt analysator, magnetisk base, vibrasjonssensorer og spiralkabler.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>6,803.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Legg i handlekurv: \u00abBalanset-4\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abBalanset-4\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/magnet-stand\/\" title=\"Magnetisk stativ Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnetisk base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/magnet-stand\/\" title=\"Magnetisk stativ Insize-60-kgf\">Magnetisk stativ Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>46.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1852\" data-quantity=\"1\" data-product_id=\"1852\" data-product_sku=\"MS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=1852\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1852\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1852\" data-product_sku=\"MS-1\" aria-label=\"Legg i handlekurv: \u00abMagnetic Stand Insize-60-kgf\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abMagnetic Stand Insize-60-kgf\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1852\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/reflective-tape\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Refleksb\u00e5nd\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-16x12.webp 16w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/05\/s-l1600-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/parts\/\" rel=\"tag\">Deler<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/reflective-tape\/\" title=\"Refleksb\u00e5nd\">Refleksb\u00e5nd<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>10.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=2329\" data-quantity=\"1\" data-product_id=\"2329\" data-product_sku=\"rt-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=2329\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_2329\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"2329\" data-product_sku=\"rt-1\" aria-label=\"Legg i handlekurv: \u00abReflective tape\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abReflective tape\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_2329\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/dynamic-balancer-balanset-1a\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &quot;Balanset-1A&quot; OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A-settet inneholder grensesnittenhet, sensorer, turteller og tilbeh\u00f8r\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/nb\/product-category\/devices\/\" rel=\"tag\">Enheter<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/nb\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamisk balanseringsapparat &quot;Balanset-1A&quot; OEM\">Dynamisk balanseringsapparat \"Balanset-1A\" OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,735.00<\/span> + MVA (hvis aktuelt)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=4193\" data-quantity=\"1\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Legg i handlekurv\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Legg i handlekurv\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/nb\/wp-json\/wp\/v2\/glossary\/173?add-to-cart=4193\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_4193\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"4193\" data-product_sku=\"BS-1OEM\" aria-label=\"Legg i handlekurv: \u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb\" rel=\"nofollow\" data-success_message=\"\u00abDynamic balancer \u201cBalanset-1A\u201d OEM\u00bb ble lagt til i handlekurven\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Legg i handlekurv<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_4193\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p>A <strong>nodalpunkt<\/strong> \u2014 ogs\u00e5 kalt en node, eller en nodelinje n\u00e5r bevegelsen betraktes i tre dimensjoner \u2014 er et bestemt punkt langs en vibrerende <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/rotor\/\">rotor<\/a> hvor <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/displacement\/\">forskyvning<\/a> forblir null mens rotoren vibrerer med en bestemt <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/natural-frequency\/\">naturlig frekvens<\/a>. Selv n\u00e5r resten av skaftet b\u00f8yer seg og svinger i sin bevegelse, forblir knutepunktet stille i forhold til skaftets n\u00f8ytrale posisjon. Knutepunkter er grunnleggende trekk ved <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/mode-shape\/\">modusformer<\/a>, og \u00e5 vite hvor de befinner seg er avgj\u00f8rende for <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/rotor-dynamics\/\">rotordynamikk<\/a> analyse, for <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/balansering\/\">balansering<\/a> strategi, og for \u00e5 bestemme hvor vibrasjonssensorene skal monteres. Feilvurderer man dem, kan en balansering mislykkes eller et overv\u00e5kingssystem miste oversikten over reelle vibrasjoner; forst\u00e5r man dem, blir begge deler en enkel sak.<\/p>\n<h2>1. Knutepunkter i ulike svingningsmoduser<\/h2>\n<p>Hver svingningstilstand i en aksel har sitt eget m\u00f8nster av knutepunkter og antiknutepunkter, som blir stadig mer komplisert etter hvert som svingningstilstandens nummer \u00f8ker.<\/p>\n<h3>F\u00f8rste b\u00f8yningsmodus<\/h3>\n<p>Den f\u00f8rste (grunnleggende) b\u00f8yemodusen har vanligvis:<\/p>\n<ul>\n<li><strong>ingen interne noder<\/strong> \u2014 ingen punkt med null avb\u00f8yning langs akselavstanden;<\/li>\n<li><strong>lagerplasseringer som omtrentlige knutepunkter<\/strong> \u2014 i en konstruksjon med enkle st\u00f8ttepunkter fungerer lagrene som knutepunkter;<\/li>\n<li><strong>maksimal nedb\u00f8yning<\/strong> omtrent midt mellom lagrene; og<\/li>\n<li><strong>en enkel bueform<\/strong> \u2014 akselen b\u00f8yer seg i en jevn kurve.<\/li>\n<\/ul>\n<h3>Andre b\u00f8yningsmodus<\/h3>\n<p>Den andre modusen har et mer komplekst m\u00f8nster:<\/p>\n<ul>\n<li><strong>\u00e9n intern node<\/strong> \u2014 et enkelt punkt, vanligvis n\u00e6r midten av spennet, der nedb\u00f8yningen er null;<\/li>\n<li><strong>en S-formet kurve<\/strong> \u2014 akselen b\u00f8yer seg i motsatte retninger p\u00e5 hver side av knutepunktet;<\/li>\n<li><strong>to antinoder<\/strong> \u2014 maksimal nedb\u00f8yning p\u00e5 hver side av knutepunktet; og<\/li>\n<li><strong>en h\u00f8yere frekvens<\/strong> \u2014 dens egenfrekvens ligger godt over den f\u00f8rste modusen.<\/li>\n<\/ul>\n<h3>Tredje modus og h\u00f8yere<\/h3>\n<ul>\n<li><strong>tredje modus:<\/strong> to interne knutepunkter og tre antinoder;<\/li>\n<li><strong>fjerde modus:<\/strong> tre knutepunkter og fire antinoder;<\/li>\n<li><strong>generell regel:<\/strong> modus N har (N \u2212 1) interne knutepunkter; og<\/li>\n<li><strong>\u00f8kende kompleksitet:<\/strong> H\u00f8yere moduser viser stadig mer intrikate b\u00f8lgem\u00f8nstre.<\/li>\n<\/ul>\n<h2>2. Den fysiske betydningen av knutepunkter<\/h2>\n<h3>Ingen nedb\u00f8yning \u2014 men maksimal belastning<\/h3>\n<p>Ved et knutepunkt, under vibrasjon ved den aktuelle modens egenfrekvens:<\/p>\n<ul>\n<li>sideforskyvningen er null, og akselen g\u00e5r gjennom sin n\u00f8ytrale akse;<\/li>\n<li>likevel er b\u00f8yespenningen vanligvis st\u00f8rst der, fordi hellingen p\u00e5 b\u00f8yningskurven er st\u00f8rst akkurat der; og<\/li>\n<li>Skj\u00e6rkreftene er ogs\u00e5 st\u00f8rst ved knutepunktet.<\/li>\n<\/ul>\n<p>Denne kontraintuitive sammenhengen \u2013 minst bevegelse, mest belastning \u2013 er grunnen til at et knutepunkt kan v\u00e6re et utmerket sted for st\u00f8tte, men likevel et d\u00e5rlig sted \u00e5 vurdere rotorens tilstand utelukkende p\u00e5 grunnlag av bevegelse.<\/p>\n<h3>Null f\u00f8lsomhet<\/h3>\n<p>En kraft eller masse som virker p\u00e5 et knutepunkt, har minimal innvirkning p\u00e5 akkurat den modusen:<\/p>\n<ul>\n<li>legge til <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/correction-weight\/\">korreksjonsvekter<\/a> ved en node bidrar i liten grad til \u00e5 balansere den modusen;<\/li>\n<li>sensorer plassert ved en node registrerer minimale vibrasjoner for den aktuelle modusen; og<\/li>\n<li>En st\u00f8tte eller en begrensning ved et knutepunkt endrer knutepunktets egenfrekvens knapt.<\/li>\n<\/ul>\n<h2>3. Praktiske implikasjoner for balanse<\/h2>\n<h3>Valg av korrigeringsplan<\/h3>\n<p>Kunnskapen om hvor knutepunktene befinner seg, er avgj\u00f8rende for hele balanseringsmetoden, og det er store forskjeller mellom stive og fleksible rotorer.<\/p>\n<h4>For stive rotorer<\/h4>\n<ul>\n<li>de opererer under den f\u00f8rste kritiske hastigheten;<\/li>\n<li>den f\u00f8rste moden blir ikke nevneverdig stimulert;<\/li>\n<li>standard <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/two-plane-balancing\/\">toplansbalansering<\/a> ved rotorendene er effektiv; og<\/li>\n<li>Knutepunkter er ikke det viktigste.<\/li>\n<\/ul>\n<h4>For fleksible rotorer<\/h4>\n<ul>\n<li>de opererer ved eller over kritiske hastigheter;<\/li>\n<li>man m\u00e5 ta hensyn til modale former og knutepunkter;<\/li>\n<li><strong>effektiv <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/correction-plane\/\">korreksjonsplan<\/a><\/strong> ligger ved eller i n\u00e6rheten av antinodene \u2013 punktene med st\u00f8rst avb\u00f8yning;<\/li>\n<li><strong>d\u00e5rlige steder<\/strong> er korreksjonsplan ved eller i n\u00e6rheten av et knutepunkt, som knapt p\u00e5virker den modusen; og<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/modal-balancing\/\">modal balansering<\/a><\/strong> Tar eksplisitt hensyn til nodalpunktplasseringer ved distribusjon av korreksjonsvekter<\/li>\n<\/ul>\n<h3>Eksempel: Balansering i andre modus<\/h3>\n<p>Tenk deg en lang, fleksibel aksel som roterer over sin f\u00f8rste kritiske hastighet, og dermed utl\u00f8ser den andre modusen:<\/p>\n<ul>\n<li>den andre modusen har ett knutepunkt n\u00e6r midten av spennet;<\/li>\n<li>\u00c5 plassere hele korreksjonsvekten n\u00e6r midtpunktet \u2013 p\u00e5 knutepunktet \u2013 ville v\u00e6re ineffektivt;<\/li>\n<li>den optimale strategien er \u00e5 plassere korreksjoner ved de to antinodene, \u00e9n p\u00e5 hver side av noden; og<\/li>\n<li>Vektfordelingsm\u00f8nsteret m\u00e5 samsvare med den andre modegangen for at balanseringen skal fungere.<\/li>\n<\/ul>\n<h2>4. Hensyn ved plassering av sensorer<\/h2>\n<h3>Strategi for vibrasjonsm\u00e5ling<\/h3>\n<p>Knutepunkter har en avgj\u00f8rende innvirkning p\u00e5 <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/vibration-monitoring\/\">vibrasjonsoverv\u00e5king<\/a>.<\/p>\n<h4>Unng\u00e5 nodale steder<\/h4>\n<ul>\n<li>en sensor ved en node registrerer minimal vibrasjon for den aktuelle modusen;<\/li>\n<li>det kan f\u00f8re til at man overser et alvorlig vibrasjonsproblem hvis dette er det eneste m\u00e5lepunktet; og<\/li>\n<li>Kan gi et feilaktig inntrykk av akseptable vibrasjonsniv\u00e5er<\/li>\n<\/ul>\n<h4>M\u00e5lrett antinode-plasseringer<\/h4>\n<ul>\n<li>antinoder viser den st\u00f8rste svingningsamplituden;<\/li>\n<li>de er de som er mest oppmerksomme p\u00e5 et problem som er i ferd med \u00e5 oppst\u00e5;<\/li>\n<li>for den f\u00f8rste modusen er disse vanligvis plassert ved lagrene; og<\/li>\n<li>For h\u00f8yere moduser kan det v\u00e6re n\u00f8dvendig med mellomliggende m\u00e5lepunkter.<\/li>\n<\/ul>\n<h4>Flere m\u00e5lepunkter<\/h4>\n<ul>\n<li>For fleksible rotorer, m\u00e5l p\u00e5 flere aksiale steder<\/li>\n<li>dette sikrer at ingen modus blir oversett fordi en sensor tilfeldigvis befant seg p\u00e5 en node;<\/li>\n<li>det gj\u00f8r det mulig \u00e5 bestemme modegravitasjonene eksperimentelt; og<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/critical-machinery\/\">kritisk utstyr<\/a> har ofte sensorer i hver ende samt midt p\u00e5 broen.<\/li>\n<\/ul>\n<h2>5. Bestemmelse av knutepunkters plassering<\/h2>\n<h3>Analytisk prediksjon<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/modal-analysis\/\">Finite-element-analyse<\/a>:<\/strong> beregner modegangene og identifiserer knutepunktene.<\/li>\n<li><strong>Str\u00e5leteori:<\/strong> For enkle konfigurasjoner kan man beregne knutepunktplasseringene ved hjelp av eksakte l\u00f8sninger.<\/li>\n<li><strong>Designverkt\u00f8y:<\/strong> Programvaren for rotordynamikk viser hver modegang visuelt med knutepunktene markert.<\/li>\n<\/ul>\n<h3>Eksperimentell identifikasjon<\/h3>\n<p><strong>1. St\u00f8ttest<\/strong> \u2014 sl\u00e5 p\u00e5 skaftet p\u00e5 flere steder med en hammer utstyrt med m\u00e5leinstrumenter og m\u00e5le responsen p\u00e5 mange punkter; et sted som ikke viser noen respons ved en gitt frekvens, er et knutepunkt for den aktuelle modusen. Teknikken er beskrevet i detalj under <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/bump-test\/\">st\u00f8ttesting<\/a> og <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/impact-testing\/\">slagpr\u00f8ving<\/a>.<\/p>\n<p><strong>2. M\u00e5ling av driftsavb\u00f8yningsform<\/strong> \u2014 ved drift n\u00e6r en kritisk hastighet m\u00e5ler man vibrasjonen p\u00e5 mange punkter langs aksen, plotter avb\u00f8yningsamplituden mot posisjonen og registrerer nullpunktene som knutepunktene. Dette er kjernen i <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/ods-analysis\/\">analyse av operasjonell avb\u00f8yningsform<\/a>.<\/p>\n<p><strong>3. N\u00e6rhetssensor-matriser<\/strong> \u2014 installer flere ber\u00f8ringsfrie <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/proximity-probe\/\">n\u00e6rhetsprober<\/a> langs akselen og m\u00e5le nedsenkningen direkte under oppstart, eller <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/coastdown\/\">kystned<\/a>; dette er den mest n\u00f8yaktige eksperimentelle metoden for \u00e5 finne noder.<\/p>\n<h2>6. Knutepunkter vs. antinoder<\/h2>\n<p>Knutepunkter og mellomrom er to sider av samme sak.<\/p>\n<table>\n<tr>\n<th>Knutepunkter<\/th>\n<th>Antinoder<\/th>\n<\/tr>\n<tr>\n<td>Null avb\u00f8yning<\/td>\n<td>Maksimal avb\u00f8yning<\/td>\n<\/tr>\n<tr>\n<td>Maksimal b\u00f8yningshelling og spenning<\/td>\n<td>Null b\u00f8yningshelling<\/td>\n<\/tr>\n<tr>\n<td>Lav effektivitet for kraftp\u00e5f\u00f8ring eller -m\u00e5ling<\/td>\n<td>Maksimal effektivitet for korreksjonsvekter<\/td>\n<\/tr>\n<tr>\n<td>Ideell for st\u00f8ttepunkter (minimerer overf\u00f8rt kraft)<\/td>\n<td>Optimale plasseringer for sensorer<\/td>\n<\/tr>\n<tr>\n<td>-<\/td>\n<td>St\u00f8rst spenning ved kombinert belastning<\/td>\n<\/tr>\n<\/table>\n<h2>7. Praktiske anvendelser og casestudier<\/h2>\n<h3>Tilfelle: Rulle til papirmaskin<\/h3>\n<ul>\n<li><strong>Situasjon:<\/strong> en lang (6 meter) valse som g\u00e5r med 1 200 o\/min og gir sterke vibrasjoner.<\/li>\n<li><strong>Analyse:<\/strong> Den opererte over den f\u00f8rste kritiske hastigheten, noe som utl\u00f8ste den andre modusen med et knutepunkt midt p\u00e5 spennet.<\/li>\n<li><strong>F\u00f8rste fors\u00f8k:<\/strong> Det ble montert vekter midt p\u00e5 broen \u2013 det mest praktiske stedet \u2013 men resultatet ble d\u00e5rlig.<\/li>\n<li><strong>L\u00f8sning:<\/strong> Da man inns\u00e5 at midtpunktet var knutepunktet, ble vektene fordelt p\u00e5 kvartpunktene (antinodene).<\/li>\n<li><strong>Resultat:<\/strong> Vibrasjonen ble redusert med 85 %, noe som vitner om en vellykket modalbalanse.<\/li>\n<\/ul>\n<h3>Eksempel: Overv\u00e5king av dampturbiner<\/h3>\n<ul>\n<li><strong>Situasjon:<\/strong> Et nytt overv\u00e5kingssystem viste lave vibrasjonsniv\u00e5er til tross for en kjent ubalanse.<\/li>\n<li><strong>Etterforskning:<\/strong> sensoren var ved en feiltakelse blitt plassert n\u00e6r knutepunktet for den dominerende modusen.<\/li>\n<li><strong>L\u00f8sning:<\/strong> Ekstra sensorer plassert ved antinodene avsl\u00f8rte de faktiske vibrasjonsniv\u00e5ene.<\/li>\n<li><strong>Lekse:<\/strong> Ta alltid hensyn til svingningsformene n\u00e5r du utformer et overv\u00e5kingssystem.<\/li>\n<\/ul>\n<h2>8. Videreg\u00e5ende hensyn<\/h2>\n<h3>Flytte noder<\/h3>\n<p>I enkelte systemer endrer knutepunktene seg avhengig av driftsforholdene:<\/p>\n<ul>\n<li>Den hastighetsavhengige lagerstivheten forskyver knutepunktene;<\/li>\n<li>temperaturen p\u00e5virker akselens stivhet;<\/li>\n<li>responsen kan v\u00e6re belastningsavhengig; og<\/li>\n<li>Asymmetriske systemer kan ha forskjellige knutepunkter for horisontal og vertikal bevegelse.<\/li>\n<\/ul>\n<h3>Omtrentlige vs. sanne noder<\/h3>\n<ul>\n<li><strong>Ekte noder:<\/strong> n\u00f8yaktige nullpunkter i et idealisert system.<\/li>\n<li><strong>Omtrentlige noder:<\/strong> punkter med sv\u00e6rt liten \u2013 men ikke helt null \u2013 avb\u00f8yning i et reelt system med <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/damping\/\">demping<\/a> og andre ikke-ideelle effekter.<\/li>\n<li><strong>Praktisk konsekvens:<\/strong> en ekte node er en <em>region<\/em> med liten avb\u00f8yning snarere enn et eksakt matematisk punkt.<\/li>\n<\/ul>\n<h2>9. Praktisk anvendelse i feltet<\/h2>\n<p>For de stive rotorene som utgj\u00f8r det meste av industrimaskineriet \u2013 pumper, vifter, motorer og lignende \u2013 er driftsregelen betryggende enkel: holder man seg under den f\u00f8rste kritiske hastigheten, oppst\u00e5r de problematiske b\u00f8yningspunktene aldri, s\u00e5 to korrigeringsplaner n\u00e6r rotorendene er tilstrekkelig. En b\u00e6rbar tokanalsanalysator som <a href=\"https:\/\/vibromera.eu\/nb\/produkt\/balanset-1\/\">Balanset-1A<\/a> utf\u00f8rer nettopp det, enten i ett eller to plan <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/feltbalansering\/\">feltbalansering<\/a> i maskinens egne lagre, ved \u00e5 m\u00e5le amplituden og <a href=\"https:\/\/vibromera.eu\/nb\/glossary\/phase\/\">fase<\/a> for \u00e5 beregne vektene. N\u00e5r en rotor m\u00e5 kj\u00f8re ved eller over en kritisk hastighet, gj\u00f8r de samme amplitude- og fasedataene, m\u00e5lt p\u00e5 flere aksiale punkter, det mulig for analytikeren \u00e5 kartlegge modegangen og bekrefte hvilket plan som er en antinode f\u00f8r noen vekt blir lagt til \u2013 forskjellen mellom en forbedring p\u00e5 85 % og et bortkastet fors\u00f8k. Kort sagt er det forst\u00e5elsen av knutepunkter som gj\u00f8r at vibrasjonsdata kan omsettes til en riktig beslutning om balansering.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/nb\/glossary\/\">\u2190 Tilbake til hovedindeksen<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>L\u00e6r om nodepunkter, plasseringer p\u00e5 en vibrerende aksel der nedb\u00f8yningen forblir null, som er kritiske for \u00e5 forst\u00e5 modusformer, balansering og plassering av sensorer i roterende maskineri.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,111],"tags":[],"class_list":["post-173","glossary","type-glossary","status-publish","hentry","category-glossary","category-rotor-balancing"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/173\/revisions"}],"predecessor-version":[{"id":101441,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/glossary\/173\/revisions\/101441"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/media?parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/categories?post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/nb\/wp-json\/wp\/v2\/tags?post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}