{"id":173,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/nodal-point\/"},"modified":"2026-07-03T10:09:35","modified_gmt":"2026-07-03T10:09:35","slug":"nodal-point","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ht\/glossary\/nodal-point\/","title":{"rendered":"What is a Nodal Point in Rotor Vibration?"},"content":{"rendered":"<h1>Understanding Nodal Points in Rotor Vibration<\/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\/ht\/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\/ht\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer 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 full kit portable balancer and vibration analyzer\" 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\/ht\/product-category\/devices\/\" rel=\"tag\">Devices<\/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\/ht\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">Portable balancer &#038; Vibration analyzer 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\">&euro;<\/span>1,975.00<\/span> + VAT (if applicable)<\/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=\"\/ht\/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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ht\/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=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ht\/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\/ht\/product\/vibration-sensor\/\" title=\"Vibration sensor\">\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 vibration sensor close-up\" 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\/ht\/product-category\/parts\/\" rel=\"tag\">Parts<\/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\/ht\/product\/vibration-sensor\/\" title=\"Vibration sensor\">Vibration sensor<\/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\">&euro;<\/span>90.00<\/span> + VAT (if applicable)<\/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=\"\/ht\/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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ht\/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=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ht\/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\/ht\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">\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=\"Optical Sensor (Laser Tachometer)\" 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\/ht\/product-category\/parts\/\" rel=\"tag\">Parts<\/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\/ht\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">Optical Sensor (Laser Tachometer)<\/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\">&euro;<\/span>124.00<\/span> + VAT (if applicable)<\/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=\"\/ht\/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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ht\/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=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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\/ht\/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\/ht\/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 rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" 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\/ht\/product-category\/devices\/\" rel=\"tag\">Devices<\/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\/ht\/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\">&euro;<\/span>6,803.00<\/span> + VAT (if applicable)<\/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=\"\/ht\/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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ht\/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=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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 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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\/ht\/product-category\/parts\/\" rel=\"tag\">Parts<\/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\/ht\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">Magnetic Stand 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 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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\">&euro;<\/span>1,735.00<\/span> + VAT (if applicable)<\/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=\"\/ht\/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=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" 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=\"\/ht\/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=\"Add to cart: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/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>nodal point<\/strong> \u2014 also called a node, or a nodal line when the motion is viewed in three dimensions \u2014 is a specific location along a vibrating <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/rotor\/\">rotor<\/a> where the <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/displacement\/\">displacement<\/a> stays zero while the rotor vibrates at a particular <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/natural-frequency\/\">natural frequency<\/a>. Even as the rest of the shaft bends and sweeps through its motion, the nodal point remains stationary relative to the shaft&#8217;s neutral position. Nodal points are fundamental features of <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/mode-shape\/\">mode shapes<\/a>, and knowing where they fall is decisive for <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/rotor-dynamics\/\">rotor dynamics<\/a> analysis, for <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/balancing\/\">balancing<\/a> strategy, and for deciding where to mount vibration sensors. Misjudge them and a balance job fails or a monitoring system goes blind to real vibration; understand them and both become straightforward.<\/p>\n<h2>1. Nodal Points in Different Vibration Modes<\/h2>\n<p>Each mode of a shaft has its own pattern of nodes and antinodes, growing more intricate as the mode number rises.<\/p>\n<h3>First Bending Mode<\/h3>\n<p>The first (fundamental) bending mode typically has:<\/p>\n<ul>\n<li><strong>zero internal nodes<\/strong> \u2014 no point of zero deflection along the shaft span;<\/li>\n<li><strong>bearing locations as approximate nodes<\/strong> \u2014 in a simply-supported layout the bearings act as near-nodal points;<\/li>\n<li><strong>maximum deflection<\/strong> near mid-span between the bearings; and<\/li>\n<li><strong>a simple arc shape<\/strong> \u2014 the shaft bends in a single smooth curve.<\/li>\n<\/ul>\n<h3>Second Bending Mode<\/h3>\n<p>The second mode has a more complex pattern:<\/p>\n<ul>\n<li><strong>one internal node<\/strong> \u2014 a single point, usually near mid-span, where deflection is zero;<\/li>\n<li><strong>an S-curve shape<\/strong> \u2014 the shaft bends in opposite directions on either side of the node;<\/li>\n<li><strong>two antinodes<\/strong> \u2014 maximum deflection on each side of the node; and<\/li>\n<li><strong>a higher frequency<\/strong> \u2014 its natural frequency is well above the first mode.<\/li>\n<\/ul>\n<h3>Third Mode and Higher<\/h3>\n<ul>\n<li><strong>third mode:<\/strong> two internal nodal points and three antinodes;<\/li>\n<li><strong>fourth mode:<\/strong> three nodal points and four antinodes;<\/li>\n<li><strong>general rule:<\/strong> mode N has (N \u2212 1) internal nodal points; and<\/li>\n<li><strong>increasing complexity:<\/strong> higher modes show progressively more intricate wave patterns.<\/li>\n<\/ul>\n<h2>2. Physical Significance of Nodal Points<\/h2>\n<h3>Zero Deflection \u2014 but Maximum Stress<\/h3>\n<p>At a nodal point, during vibration at that mode&#8217;s natural frequency:<\/p>\n<ul>\n<li>lateral displacement is zero and the shaft passes through its neutral axis;<\/li>\n<li>yet bending stress is typically at a maximum, because the slope of the deflection curve is steepest there; and<\/li>\n<li>shear forces are also greatest at the node.<\/li>\n<\/ul>\n<p>This counter-intuitive pairing \u2014 least movement, most stress \u2014 is why a node can be an excellent support location yet a poor place to judge a rotor&#8217;s health by motion alone.<\/p>\n<h3>Zero Sensitivity<\/h3>\n<p>A force or mass applied at a nodal point has minimal effect on that particular mode:<\/p>\n<ul>\n<li>adding <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/correction-weight\/\">correction weights<\/a> at a node does little to balance that mode;<\/li>\n<li>sensors placed at a node detect minimal vibration for that mode; and<\/li>\n<li>a support or constraint at a node barely shifts the mode&#8217;s natural frequency.<\/li>\n<\/ul>\n<h2>3. Practical Implications for Balancing<\/h2>\n<h3>Correction-Plane Selection<\/h3>\n<p>Knowing where the nodes lie steers the whole balancing approach, and it differs sharply between rigid and flexible rotors.<\/p>\n<h4>For Rigid Rotors<\/h4>\n<ul>\n<li>they operate below the first critical speed;<\/li>\n<li>the first mode is not significantly excited;<\/li>\n<li>standard <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/two-plane-balancing\/\">two-plane balancing<\/a> near the rotor ends is effective; and<\/li>\n<li>nodal points are not a primary concern.<\/li>\n<\/ul>\n<h4>For Flexible Rotors<\/h4>\n<ul>\n<li>they operate through or above critical speeds;<\/li>\n<li>mode shapes and nodal points must be taken into account;<\/li>\n<li><strong>effective <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/correction-plane\/\">correction planes<\/a><\/strong> sit at or near the antinodes \u2014 the points of maximum deflection;<\/li>\n<li><strong>ineffective locations<\/strong> are correction planes at or near a node, which barely influence that mode; and<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/ht\/glossary\/modal-balancing\/\">modal balancing<\/a><\/strong> explicitly accounts for nodal-point locations when distributing the correction weights.<\/li>\n<\/ul>\n<h3>Example: Second-Mode Balancing<\/h3>\n<p>Consider a long flexible shaft running above its first critical speed, exciting the second mode:<\/p>\n<ul>\n<li>the second mode has one nodal point near mid-span;<\/li>\n<li>placing all the correction weight near mid-span \u2014 on the node \u2014 would be ineffective;<\/li>\n<li>the optimal strategy is to place corrections at the two antinodes, one on each side of the node; and<\/li>\n<li>the weight-distribution pattern must match the second mode shape for the balancing to work.<\/li>\n<\/ul>\n<h2>4. Sensor-Placement Considerations<\/h2>\n<h3>Vibration-Measurement Strategy<\/h3>\n<p>Nodal points have a decisive effect on <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/vibration-monitoring\/\">vibration monitoring<\/a>.<\/p>\n<h4>Avoid Nodal Locations<\/h4>\n<ul>\n<li>a sensor at a node detects minimal vibration for that mode;<\/li>\n<li>it may miss a serious vibration problem if it is the only measurement point; and<\/li>\n<li>it can give a false impression of acceptable vibration levels.<\/li>\n<\/ul>\n<h4>Target Antinode Locations<\/h4>\n<ul>\n<li>antinodes show the maximum vibration amplitude;<\/li>\n<li>they are the most sensitive to a developing problem;<\/li>\n<li>for the first mode of a simply-supported rotor the antinode lies near mid-span (the bearings are near-nodes); in practice, machine monitoring still usually measures at the bearing housings because they are the accessible, standard mounting locations; and<\/li>\n<li>for higher modes, intermediate measurement points may be needed.<\/li>\n<\/ul>\n<h4>Multiple Measurement Points<\/h4>\n<ul>\n<li>for flexible rotors, measure at several axial locations;<\/li>\n<li>this ensures no mode is missed because a sensor happened to sit on a node;<\/li>\n<li>it allows the mode shapes to be determined experimentally; and<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/ht\/glossary\/critical-machinery\/\">critical equipment<\/a> often carries sensors at every bearing plus mid-span.<\/li>\n<\/ul>\n<h2>5. Determining Nodal-Point Locations<\/h2>\n<h3>Analytical Prediction<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/vibromera.eu\/ht\/glossary\/modal-analysis\/\">Finite-element analysis<\/a>:<\/strong> calculates the mode shapes and pinpoints the nodes.<\/li>\n<li><strong>Beam theory:<\/strong> for simple configurations, closed-form solutions predict the node locations.<\/li>\n<li><strong>Design tools:<\/strong> rotordynamics software displays each mode shape visually with the nodes marked.<\/li>\n<\/ul>\n<h3>Experimental Identification<\/h3>\n<p><strong>1. Impact (bump) testing<\/strong> \u2014 strike the shaft at several locations with an instrumented hammer and measure the response at many points; a location showing no response at a given frequency is a nodal point for that mode. The technique is described in detail under <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/bump-test\/\">bump testing<\/a> and <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/impact-testing\/\">impact testing<\/a>.<\/p>\n<p><strong>2. Operating-deflection-shape measurement<\/strong> \u2014 during operation near a critical speed, measure vibration at many axial points, plot deflection amplitude against position, and read the zero-crossings as the nodal locations. This is the heart of <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/ods-analysis\/\">operating deflection shape analysis<\/a>.<\/p>\n<p><strong>3. Proximity-probe arrays<\/strong> \u2014 install several non-contact <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/proximity-probe\/\">proximity probes<\/a> along the shaft and measure deflection directly during startup or <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/coastdown\/\">coastdown<\/a>; this is the most accurate experimental method for finding nodes.<\/p>\n<h2>6. Nodal Points vs. Antinodes<\/h2>\n<p>Nodes and antinodes are complementary halves of the same picture.<\/p>\n<table>\n<tr>\n<th>Nodal Points<\/th>\n<th>Antinodes<\/th>\n<\/tr>\n<tr>\n<td>Zero deflection<\/td>\n<td>Maximum deflection<\/td>\n<\/tr>\n<tr>\n<td>Maximum bending slope and stress<\/td>\n<td>Zero bending slope<\/td>\n<\/tr>\n<tr>\n<td>Low effectiveness for force application or measurement<\/td>\n<td>Maximum effectiveness for correction weights<\/td>\n<\/tr>\n<tr>\n<td>Ideal for support locations (minimise transmitted force)<\/td>\n<td>Optimal sensor-placement locations<\/td>\n<\/tr>\n<tr>\n<td>\u2014<\/td>\n<td>Highest stress under combined loading<\/td>\n<\/tr>\n<\/table>\n<h2>7. Practical Applications and Case Studies<\/h2>\n<h3>Case: Paper-Machine Roll<\/h3>\n<ul>\n<li><strong>Situation:<\/strong> a long (6-metre) roll running at 1,200 rpm with high vibration.<\/li>\n<li><strong>Analysis:<\/strong> it was operating above the first critical speed, exciting the second mode with a node at mid-span.<\/li>\n<li><strong>Initial attempt:<\/strong> weights were added at mid-span \u2014 the convenient access point \u2014 with poor results.<\/li>\n<li><strong>Solution:<\/strong> recognising that mid-span was the nodal point, the weights were redistributed to the quarter-points (the antinodes).<\/li>\n<li><strong>Result:<\/strong> vibration fell by 85%, a successful modal balance.<\/li>\n<\/ul>\n<h3>Case: Steam-Turbine Monitoring<\/h3>\n<ul>\n<li><strong>Situation:<\/strong> a new monitoring system showed low vibration despite a known unbalance.<\/li>\n<li><strong>Investigation:<\/strong> the sensor had inadvertently been placed near the nodal point of the dominant mode.<\/li>\n<li><strong>Solution:<\/strong> additional sensors at the antinode locations revealed the true vibration levels.<\/li>\n<li><strong>Lesson:<\/strong> always consider the mode shapes when designing a monitoring system.<\/li>\n<\/ul>\n<h2>8. Advanced Considerations<\/h2>\n<h3>Moving Nodes<\/h3>\n<p>In some systems the nodal points shift with operating conditions:<\/p>\n<ul>\n<li>speed-dependent bearing stiffness moves the node locations;<\/li>\n<li>temperature affects shaft stiffness;<\/li>\n<li>the response can be load-dependent; and<\/li>\n<li>asymmetric systems may have different nodes for horizontal and vertical motion.<\/li>\n<\/ul>\n<h3>Approximate vs. True Nodes<\/h3>\n<ul>\n<li><strong>True nodes:<\/strong> exact zero-deflection points in an idealised system.<\/li>\n<li><strong>Approximate nodes:<\/strong> locations of very low \u2014 but not exactly zero \u2014 deflection in a real system with <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/damping\/\">damping<\/a> and other non-ideal effects.<\/li>\n<li><strong>Practical consequence:<\/strong> a real node is a <em>region<\/em> of low deflection rather than an exact mathematical point.<\/li>\n<\/ul>\n<h2>9. Putting It to Work in the Field<\/h2>\n<p>For the rigid rotors that make up most industrial machinery \u2014 pumps, fans, motors, and the like \u2014 the working rule is reassuringly simple: stay below the first critical speed and the troublesome bending nodes never appear, so two correction planes near the rotor ends do the job. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/ht\/product\/balanset-1\/\">Balanset-1A<\/a> performs exactly that single- or two-plane <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/field-balancing\/\">field balancing<\/a> in the machine&#8217;s own bearings, measuring amplitude and <a href=\"https:\/\/vibromera.eu\/ht\/glossary\/phase\/\">phase<\/a> to compute the weights. When a rotor must run through or above a critical speed, the same amplitude-and-phase data taken at several axial points lets the analyst map the mode shape and confirm which plane is an antinode before any weight is committed \u2014 the difference between an 85% improvement and a wasted attempt. Understanding nodal points, in short, is what turns vibration data into a correct balancing decision.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ht\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about nodal points, locations on a vibrating shaft where deflection remains zero, critical for understanding mode shapes, balancing, and sensor placement in rotating machinery.<\/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\/ht\/wp-json\/wp\/v2\/glossary\/173","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/glossary\/173\/revisions"}],"predecessor-version":[{"id":102180,"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/glossary\/173\/revisions\/102180"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/media?parent=173"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/categories?post=173"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ht\/wp-json\/wp\/v2\/tags?post=173"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}