{"id":310,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/whirl\/"},"modified":"2026-05-23T22:40:29","modified_gmt":"2026-05-23T22:40:29","slug":"whirl","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ga\/glossary\/whirl\/","title":{"rendered":"What is Whirl and Whip in Rotor Dynamics?"},"content":{"rendered":"<h1>Understanding Rotor Whirl and Whip Instabilities<\/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\/ga\/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\/ga\/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\/ga\/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\/ga\/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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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\/ga\/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\/ga\/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\/ga\/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\/ga\/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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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\/ga\/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\/ga\/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\/ga\/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\/ga\/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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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\/ga\/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\/ga\/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\/ga\/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\/ga\/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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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 href=\"https:\/\/vibromera.eu\/ga\/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\/ga\/product\/magnet-stand\/\" title=\"Magnetic Stand 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=\"Magnet 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\/ga\/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\/ga\/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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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=\"\/ga\/wp-json\/wp\/v2\/glossary\/310?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><strong>Whirl<\/strong> and <strong>whip<\/strong> \u2014 most often encountered as <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/oil-whirl\/\">oil whirl<\/a> and oil whip \u2014 are two related and highly dangerous forms of self-excited, <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/sub-synchronous\/\">sub-synchronous<\/a> <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/vibration\/\">vibration<\/a> that occur in high-speed rotating machinery running in fluid-film (<a href=\"https:\/\/vibromera.eu\/ga\/glossary\/journal-bearing\/\">journal<\/a>) bearings. They are not <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/forced-vibration\/\">forced vibrations<\/a> driven by faults such as <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/unbalance\/\">unbalance<\/a> or <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/misalignment\/\">misalignment<\/a>; instead they are <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/rotor-instability\/\">rotor instabilities<\/a> in which the motion of the rotor itself generates the very forces that sustain and amplify the vibration. In both cases the shaft &#8220;whirls&#8221; \u2014 it precesses forward in a large orbit within its bearing clearance, tracing a path quite separate from its own spin.<\/p>\n<h2>1. Definition: What Are Whirl and Whip?<\/h2>\n<p>It is worth separating two ideas that the everyday term &#8220;whirl&#8221; blurs together. <em>Spin<\/em> is the rotor turning about its own geometric axis. <em>Whirl<\/em> (or precession) is the orbiting of that axis as a whole around a larger circle inside the bearing \u2014 picture a spinning coin whose centre also loops around the table. All rotors whirl a little; the trouble starts when the whirl stops being a benign response to <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/residual-unbalance\/\">residual unbalance<\/a> and becomes <strong>self-excited<\/strong>, drawing its energy from the steady rotation rather than from any external forcing. Oil whirl is the self-excited precession driven by the bearing oil film; oil whip is the violent resonance it can mature into. Because the energy source is the rotation itself, these instabilities cannot be balanced out \u2014 a defining contrast with synchronous problems.<\/p>\n<h2>2. The Mechanism: How Does It Happen?<\/h2>\n<p>In a fluid-film bearing the rotating shaft is supported not by metal-to-metal contact but by a high-pressure wedge of oil. The shaft does not sit in the centre of the bearing; it rides up one side, displaced by the load it carries. As the journal surface drags oil around the annular gap, the lubricant circulates at an <strong>average speed of slightly less than half the shaft&#8217;s surface speed<\/strong> \u2014 the fluid touching the shaft moves at shaft speed, the fluid against the stationary bearing wall is nearly still, and the bulk average lands just under 0.5\u00d7.<\/p>\n<p>Oil whirl occurs when this circulating film begins to &#8220;push&#8221; the lightly loaded shaft ahead of itself, sweeping it into a large forward orbit around the bearing. The frequency of the whirl is set by the average velocity of the oil film, which falls typically between <strong>42% and 48% of running speed (0.42\u00d7 to 0.48\u00d7)<\/strong>. That distinctive sub-synchronous signature \u2014 close to, but never exactly, half of <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/running-speed\/\">running speed<\/a> \u2014 is the fingerprint analysts look for. (The &#8220;slightly less than half&#8221; figure is also why oil whirl is sometimes loosely called &#8220;half-speed whirl,&#8221; though the true value never quite reaches 0.5\u00d7.)<\/p>\n<h2>3. Oil Whirl: The Precursor<\/h2>\n<p>Oil whirl is usually the opening stage of the instability \u2014 a warning, not yet a catastrophe. Its characteristics are:<\/p>\n<ul>\n<li><strong>Frequency:<\/strong> appears as a distinct peak in the <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/fft\/\">FFT<\/a> <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/spectrum\/\">spectrum<\/a> between 0.42\u00d7 and 0.48\u00d7 of RPM.<\/li>\n<li><strong>Behaviour:<\/strong> the whirl frequency <em>increases<\/em> as the machine speeds up, always tracking that ~45% proportion of running speed. On a run-up it climbs as a sub-synchronous shadow beneath the 1\u00d7 line.<\/li>\n<li><strong>Severity:<\/strong> it can produce high but sometimes stable vibration, and it may appear or vanish as load, speed, or oil temperature change. Undesirable, certainly \u2014 but not always immediately destructive.<\/li>\n<li><strong>Sensitivity:<\/strong> lightly loaded, oversized, or worn bearings are the usual culprits, because a low specific load lets the oil wedge dominate the shaft&#8217;s position.<\/li>\n<\/ul>\n<h2>4. Oil Whip: The Critical Danger<\/h2>\n<p>Oil whip is a far more severe condition that grows directly out of oil whirl. It strikes when the machine accelerates to the point where the oil-whirl frequency (at roughly 45% of running speed) climbs up to meet the rotor&#8217;s <strong>first <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/natural-frequency\/\">natural frequency<\/a><\/strong> \u2014 its first <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/critical-speed\/\">critical speed<\/a>. At that moment the whirl &#8220;locks onto&#8221; the natural frequency and excites a full-blown <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/resonance\/\">resonance<\/a>. Its characteristics are:<\/p>\n<ul>\n<li><strong>Frequency:<\/strong> the vibration locks at the rotor&#8217;s first natural frequency and <em>does not rise any further<\/em>, even as the machine keeps speeding up \u2014 so the sub-synchronous peak &#8220;flatlines&#8221; while the 1\u00d7 peak marches on.<\/li>\n<li><strong>Amplitude:<\/strong> the vibration grows very large, becoming violent and unstable.<\/li>\n<li><strong>Behaviour:<\/strong> oil whip is extremely destructive and will <em>not<\/em> clear by speeding up further. It can wreck bearings, seals, and the rotor itself within a very short time, sometimes through severe <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/rotor-rub\/\">rotor rub<\/a> as the orbit fills the clearance.<\/li>\n<\/ul>\n<p>The speed at which whip sets in is typically just over <strong>twice the rotor&#8217;s first critical speed<\/strong> \u2014 the point where the ~0.5\u00d7 whirl line crosses the first natural frequency. A machine in the grip of oil whip needs an immediate <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/shutdown\/\">shutdown<\/a>; this is precisely the scenario that <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/machinery-protection\/\">machinery-protection<\/a> systems are built to trip on.<\/p>\n<h2>5. How to Identify Whirl and Whip<\/h2>\n<ul>\n<li><strong>Spectrum analysis:<\/strong> hunt for a strong sub-synchronous peak. During a run-up, if that peak&#8217;s frequency rises with speed it is whirl; if it &#8220;flatlines&#8221; at a fixed value while the 1\u00d7 peak keeps climbing, it has transitioned to whip.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/ga\/glossary\/orbit\/\">Orbit plot<\/a>:<\/strong> the shaft orbit is a large, forward-precessing circle or ellipse, frequently with the 1\u00d7 component superimposed to give a characteristic &#8220;loop-the-loop&#8221; pattern.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/ga\/glossary\/waterfall-plot\/\">Waterfall plot<\/a>:<\/strong> a waterfall (or <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/cascade-plot\/\">cascade<\/a>) plot from a start-up gives the clearest possible picture, showing the whirl frequency rising with speed until it intersects the first natural frequency and locks into whip. Mapping those crossings is exactly what a <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/campbell-diagram\/\">Campbell diagram<\/a> is for.<\/li>\n<\/ul>\n<p>Because whirl and whip live below 1\u00d7, the analyser must reach well under running speed and resolve phase accurately. A portable two-channel instrument such as the <a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-1\/\">Balanset-1A<\/a> captures the synchronised <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/amplitude\/\">amplitude<\/a> and <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/phase\/\">phase<\/a> of the running-speed component during a run-up or coast-down, which lets an engineer confirm on site that a stubborn low-frequency peak is a true bearing instability rather than ordinary unbalance \u2014 and, just as usefully, rule out a balancing problem before chasing a fix that was never going to work.<\/p>\n<h2>6. Causes and Solutions<\/h2>\n<p>These instabilities are governed by bearing design, rotor geometry, oil viscosity, temperature, and load \u2014 a tangled set of interactions captured formally in <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/rotor-dynamics\/\">rotor dynamics<\/a>. They are not caused by unbalance and cannot be cured by <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/balancing\/\">balancing<\/a>; the remedies are design-level changes:<\/p>\n<ul>\n<li>Switch to a more stable bearing geometry, such as a tilting-pad journal bearing.<\/li>\n<li>Alter the oil viscosity or operating temperature to shift the film&#8217;s behaviour.<\/li>\n<li>Increase the specific bearing load so the shaft seats firmly and the oil wedge can no longer dominate.<\/li>\n<li>Add grooves, axial dams, or lemon-bore profiles that break up the circumferential oil flow which feeds the whirl.<\/li>\n<\/ul>\n<p>A closely related instability, <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/steam-whirl\/\">steam whirl<\/a>, arises from aerodynamic rather than oil-film forces in turbines but produces a similar self-excited sub-synchronous picture \u2014 a reminder that &#8220;whirl&#8221; is a family of phenomena united by one trait: the rotor feeding energy into its own orbit.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ga\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>A guide to oil whirl and oil whip, two dangerous sub-synchronous instabilities in high-speed machinery with fluid-film bearings. Learn their causes, characteristics, and why they are so destructive.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,111],"tags":[],"class_list":["post-310","glossary","type-glossary","status-publish","hentry","category-glossary","category-rotor-balancing"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/310","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/310\/revisions"}],"predecessor-version":[{"id":101321,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/310\/revisions\/101321"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/media?parent=310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/categories?post=310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/tags?post=310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}