{"id":219,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/rotor-instability\/"},"modified":"2026-05-23T22:53:31","modified_gmt":"2026-05-23T22:53:31","slug":"rotor-instability","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/kn\/glossary\/rotor-instability\/","title":{"rendered":"What is Rotor Instability? Self-Excited Vibration"},"content":{"rendered":"<h1>\u0cb0\u0ccb\u0c9f\u0cb0\u0ccd \u0c85\u0cb8\u0ccd\u0ca5\u0cbf\u0cb0\u0ca4\u0cc6\u0caf\u0ca8\u0ccd\u0ca8\u0cc1 \u0c85\u0cb0\u0ccd\u0ca5\u0cae\u0cbe\u0ca1\u0cbf\u0c95\u0cca\u0cb3\u0ccd\u0cb3\u0cc1\u0cb5\u0cc1\u0ca6\u0cc1<\/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\/kn\/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\/kn\/product\/balanset-1\/\" title=\"\u0caa\u0ccb\u0cb0\u0ccd\u0c9f\u0cac\u0cb2\u0ccd \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0c95\u0c82\u0caa\u0ca8 \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0c95 \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-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 \u0cb8\u0c82\u0caa\u0cc2\u0cb0\u0ccd\u0ca3 \u0cb8\u0cc6\u0c9f\u0ccd \u0caa\u0ccb\u0cb0\u0ccd\u0c9f\u0cc7\u0cac\u0cb2\u0ccd \u0cb8\u0cae\u0ca4\u0ccb\u0cb2\u0ca8\u0c95\u0cbe\u0cb0 \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0c95\u0c82\u0caa\u0ca8 \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0c95\" 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\/kn\/product-category\/devices\/\" rel=\"tag\">\u0cb8\u0cbe\u0ca7\u0ca8\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/balanset-1\/\" title=\"\u0caa\u0ccb\u0cb0\u0ccd\u0c9f\u0cac\u0cb2\u0ccd \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0c95\u0c82\u0caa\u0ca8 \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0c95 \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-1A\">\u0caa\u0ccb\u0cb0\u0ccd\u0c9f\u0cac\u0cb2\u0ccd \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0c95\u0c82\u0caa\u0ca8 \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0c95 \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-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> + VAT (\u0c85\u0ca8\u0ccd\u0cb5\u0caf\u0cb5\u0cbe\u0ca6\u0cb0\u0cc6)<\/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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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\/kn\/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\/kn\/product\/vibration-sensor\/\" title=\"\u0c95\u0c82\u0caa\u0ca8 \u0cb8\u0c82\u0cb5\u0cc7\u0ca6\u0c95\">\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 \u0c95\u0c82\u0caa\u0ca8 \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd \u0cac\u0cb3\u0cbf\u0c95\u0cbf\u0c9f\u0ccd\u0c9f\u0cc1 \u0c9a\u0cbf\u0ca4\u0ccd\u0cb0\" 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\/kn\/product-category\/parts\/\" rel=\"tag\">\u0cad\u0cbe\u0c97\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/vibration-sensor\/\" title=\"\u0c95\u0c82\u0caa\u0ca8 \u0cb8\u0c82\u0cb5\u0cc7\u0ca6\u0c95\">\u0c95\u0c82\u0caa\u0ca8 \u0cb8\u0c82\u0cb5\u0cc7\u0ca6\u0c95<\/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> + VAT (\u0c85\u0ca8\u0ccd\u0cb5\u0caf\u0cb5\u0cbe\u0ca6\u0cb0\u0cc6)<\/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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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\" 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class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/kn\/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\/kn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0c86\u0caa\u0ccd\u0c9f\u0cbf\u0c95\u0cb2\u0ccd \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd (\u0cb2\u0cc7\u0cb8\u0cb0\u0ccd \u0c9f\u0ccd\u0caf\u0cbe\u0c95\u0ccb\u0cae\u0cc0\u0c9f\u0cb0\u0ccd)\">\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=\"\u0c86\u0caa\u0ccd\u0c9f\u0cbf\u0c95\u0cb2\u0ccd \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd (\u0cb2\u0cc7\u0cb8\u0cb0\u0ccd 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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\/kn\/product-category\/parts\/\" rel=\"tag\">\u0cad\u0cbe\u0c97\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0c86\u0caa\u0ccd\u0c9f\u0cbf\u0c95\u0cb2\u0ccd \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd (\u0cb2\u0cc7\u0cb8\u0cb0\u0ccd \u0c9f\u0ccd\u0caf\u0cbe\u0c95\u0ccb\u0cae\u0cc0\u0c9f\u0cb0\u0ccd)\">\u0c86\u0caa\u0ccd\u0c9f\u0cbf\u0c95\u0cb2\u0ccd \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd (\u0cb2\u0cc7\u0cb8\u0cb0\u0ccd 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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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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\/kn\/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\/kn\/product\/balanset-4\/\" title=\"\u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-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 \u0cb0\u0ccb\u0c9f\u0cb0\u0ccd \u0cb8\u0cae\u0ca4\u0ccb\u0cb2\u0ca8 \u0c95\u0cbf\u0c9f\u0ccd: \u0cb8\u0cbe\u0c97\u0cbf\u0cb8\u0cc1\u0cb5 \u0caa\u0cc6\u0c9f\u0ccd\u0c9f\u0cbf\u0c97\u0cc6, \u0cac\u0cb9\u0cc1-\u0c9a\u0cbe\u0ca8\u0cc6\u0cb2\u0ccd \u0cb8\u0cbf\u0c97\u0ccd\u0ca8\u0cb2\u0ccd \u0c95\u0c82\u0ca1\u0cbf\u0cb7\u0ca8\u0cb0\u0ccd, \u0cb9\u0ccb\u0cb2\u0ccd\u0ca1\u0ccd \u0c86\u0ca8\u0cbe\u0cb2\u0cc8\u099c\u0cb0\u0ccd, \u0cae\u0ccd\u0caf\u0cbe\u0c97\u0ccd\u0ca8\u0cc6\u0c9f\u0cbf\u0c95\u0ccd \u0cac\u0cc7\u0cb8\u0ccd, \u0c95\u0c82\u0caa\u0ca8 \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd\u200d\u0cb3\u0cc1 \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0cb8\u0cc1\u0cb0\u0cc1\u0cb3\u0cbf\u0caf\u0cbe\u0c95\u0cbe\u0cb0\u0ca6 \u0c95\u0cc7\u0cac\u0cb2\u0ccd\u200d\u0cb3\u0cc1.\" 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\/kn\/product-category\/devices\/\" rel=\"tag\">\u0cb8\u0cbe\u0ca7\u0ca8\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/balanset-4\/\" title=\"\u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-4\">\u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-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> + VAT (\u0c85\u0ca8\u0ccd\u0cb5\u0caf\u0cb5\u0cbe\u0ca6\u0cb0\u0cc6)<\/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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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\/kn\/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\/kn\/product\/magnet-stand\/\" title=\"\u0cae\u0ccd\u0caf\u0cbe\u0c97\u0ccd\u0ca8\u0cc6\u0c9f\u0cbf\u0c95\u0ccd \u0cb8\u0ccd\u0c9f\u0ccd\u0caf\u0cbe\u0c82\u0ca1\u0ccd \u0c97\u0cbe\u0ca4\u0ccd\u0cb0-60-\u0c95\u0cc6\u0c9c\u0cbf\u0c8e\u0cab\u0ccd\">\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=\"\u0cae\u0ccd\u0caf\u0cbe\u0c97\u0ccd\u0ca8\u0cc6\u0c9f\u0ccd \u0cac\u0cc7\u0cb8\u0ccd.\" 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\/kn\/product-category\/parts\/\" rel=\"tag\">\u0cad\u0cbe\u0c97\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/magnet-stand\/\" title=\"\u0cae\u0ccd\u0caf\u0cbe\u0c97\u0ccd\u0ca8\u0cc6\u0c9f\u0cbf\u0c95\u0ccd \u0cb8\u0ccd\u0c9f\u0ccd\u0caf\u0cbe\u0c82\u0ca1\u0ccd \u0c97\u0cbe\u0ca4\u0ccd\u0cb0-60-\u0c95\u0cc6\u0c9c\u0cbf\u0c8e\u0cab\u0ccd\">\u0cae\u0ccd\u0caf\u0cbe\u0c97\u0ccd\u0ca8\u0cc6\u0c9f\u0cbf\u0c95\u0ccd \u0cb8\u0ccd\u0c9f\u0ccd\u0caf\u0cbe\u0c82\u0ca1\u0ccd \u0c97\u0cbe\u0ca4\u0ccd\u0cb0-60-\u0c95\u0cc6\u0c9c\u0cbf\u0c8e\u0cab\u0ccd<\/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> + VAT (\u0c85\u0ca8\u0ccd\u0cb5\u0caf\u0cb5\u0cbe\u0ca6\u0cb0\u0cc6)<\/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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"Add to cart: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\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_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\/kn\/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\/kn\/product\/reflective-tape\/\" title=\"\u0caa\u0ccd\u0cb0\u0ca4\u0cbf\u0cab\u0cb2\u0cbf\u0ca4 \u0c9f\u0cc7\u0caa\u0ccd\">\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=\"\u0caa\u0ccd\u0cb0\u0ca4\u0cbf\u0cab\u0cb2\u0cbf\u0ca4 \u0c9f\u0cc7\u0caa\u0ccd\" 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\/kn\/product-category\/parts\/\" rel=\"tag\">\u0cad\u0cbe\u0c97\u0c97\u0cb3\u0cc1<\/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\/kn\/product\/reflective-tape\/\" title=\"\u0caa\u0ccd\u0cb0\u0ca4\u0cbf\u0cab\u0cb2\u0cbf\u0ca4 \u0c9f\u0cc7\u0caa\u0ccd\">\u0caa\u0ccd\u0cb0\u0ca4\u0cbf\u0cab\u0cb2\u0cbf\u0ca4 \u0c9f\u0cc7\u0caa\u0ccd<\/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> + VAT (\u0c85\u0ca8\u0ccd\u0cb5\u0caf\u0cb5\u0cbe\u0ca6\u0cb0\u0cc6)<\/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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"Add to cart: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\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_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\/kn\/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\/kn\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0ca1\u0cc8\u0ca8\u0cbe\u0cae\u0cbf\u0c95\u0ccd \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd &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 \u0c95\u0cbf\u0c9f\u0ccd \u0cb8\u0cbe\u0cae\u0c97\u0ccd\u0cb0\u0cbf \u0c87\u0c82\u0c9f\u0cb0\u0ccd\u200c\u0cab\u0cc7\u0cb8\u0ccd \u0caf\u0cc2\u0ca8\u0cbf\u0c9f\u0ccd, \u0cb8\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd\u200d\u0cb3\u0cc1, \u0c9f\u0ccd\u0caf\u0cbe\u0c95\u0ccb\u0cae\u0cc0\u0c9f\u0cb0\u0ccd \u0cae\u0ca4\u0ccd\u0ca4\u0cc1 \u0cac\u0cc8\u0ca4\u0ccb \u0cb8\u0cbe\u0cae\u0c97\u0ccd\u0cb0\u0cbf \u0cb8\u0cca\u0cb9\u0cbf\u0ca4\" 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, 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class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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=\"\/kn\/wp-json\/wp\/v2\/glossary\/219?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>\u0cb0\u0ccb\u0c9f\u0cb0\u0ccd \u0c85\u0cb8\u0ccd\u0ca5\u0cbf\u0cb0\u0ca4\u0cc6<\/strong> is a condition in rotating machinery in which <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/self-excited-vibration\/\">\u0cb8\u0ccd\u0cb5\u0caf\u0c82-\u0caa\u0ccd\u0cb0\u0cc7\u0cb0\u0cbf\u0ca4 \u0c95\u0c82\u0caa\u0ca8<\/a> develops and grows without bound, limited only by non-linear effects or outright failure. Unlike vibration from <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/unbalance\/\">unbalance<\/a> \u0c85\u0ca5\u0cb5\u0cbe <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/misalignment\/\">misalignment<\/a> \u2014 which are <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/forced-vibration\/\">\u0cac\u0cb2\u0caa\u0ccd\u0cb0\u0ca6 \u0c95\u0c82\u0caa\u0ca8\u0c97\u0cb3\u0cc1<\/a> driven by external forces \u2014 instability is a self-sustaining oscillation that continuously draws energy from the shaft&#8217;s steady rotation and pumps it into the vibratory motion. It is one of the most dangerous phenomena in <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/rotor-dynamics\/\">rotor dynamics<\/a>: it can appear suddenly, grow to destructive amplitudes within seconds, and \u2014 crucially \u2014 it cannot be cured by <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/balancing\/\">\u0cb8\u0cae\u0ca4\u0ccb\u0cb2\u0ca8<\/a> or alignment. It demands immediate shutdown and correction of the underlying destabilising mechanism.<\/p>\n<h2>1. Forced vs. Self-Excited Vibration<\/h2>\n<p>The single most important concept in understanding instability is the distinction between vibration that is driven and vibration that drives itself.<\/p>\n<h3>Forced vibration (stable)<\/h3>\n<p>Most machinery vibration is forced. An external force \u2014 unbalance, misalignment, a bent shaft \u2014 drives the motion, and the system simply responds:<\/p>\n<ul>\n<li>The amplitude is proportional to the magnitude of the forcing.<\/li>\n<li>The frequency matches the forcing frequency (1\u00d7, 2\u00d7, and so on).<\/li>\n<li>Remove the force and the vibration disappears.<\/li>\n<li>The system is stable; the vibration never grows without bound.<\/li>\n<\/ul>\n<h3>Self-excited vibration (unstable)<\/h3>\n<p>Instability is fundamentally different. Energy is extracted from the rotation itself rather than supplied by an external force:<\/p>\n<ul>\n<li>The amplitude grows exponentially once a threshold speed is exceeded.<\/li>\n<li>The frequency typically sits at or near a <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/natural-frequency\/\">\u0ca8\u0cc8\u0cb8\u0cb0\u0ccd\u0c97\u0cbf\u0c95 \u0c86\u0cb5\u0cc3\u0ca4\u0ccd\u0ca4\u0cbf<\/a>, and is usually <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/sub-synchronous\/\">\u0cb8\u0cac\u0ccd-\u0cb8\u0cbf\u0c82\u0c95\u0ccd\u0cb0\u0ccb\u0ca8\u0cb8\u0ccd<\/a>.<\/li>\n<li>It continues and grows even when the unbalance has been perfectly corrected.<\/li>\n<li>The system is unstable; only shutdown or a physical change can stop it.<\/li>\n<\/ul>\n<h2>2. Common Types of Rotor Instability<\/h2>\n<h3>\u0c86\u0caf\u0cbf\u0cb2\u0ccd \u0cb5\u0cb0\u0ccd\u0cb2\u0ccd<\/h3>\n<p><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/oil-whirl\/\">\u0c86\u0caf\u0cbf\u0cb2\u0ccd \u0cb5\u0cb0\u0ccd\u0cb2\u0ccd<\/a> is the most common instability in fluid-film <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/journal-bearing\/\">\u0c9c\u0cb0\u0ccd\u0ca8\u0cb2\u0ccd \u0cac\u0cc7\u0cb0\u0cbf\u0c82\u0c97\u0ccd<\/a> systems. The oil wedge that supports the shaft develops a tangential force that pushes the journal around the bearing clearance. It appears at roughly 0.42\u20130.48\u00d7 running speed (sub-synchronous), typically once speed exceeds about twice the first <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/critical-speed\/\">critical speed<\/a>, and shows as high-amplitude sub-synchronous vibration that worsens with speed. Bearing design changes, added <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/preload\/\">\u0caa\u0ccd\u0cb0\u0cc0\u0cb2\u0ccb\u0ca1\u0ccd<\/a>, or offset configurations are the usual remedies.<\/p>\n<h3>Oil whip (severe instability)<\/h3>\n<p>Oil whip is the dangerous mature form of oil whirl. As the rotor accelerates, the whirl frequency rises until it locks onto the first natural frequency and then stays there, regardless of further speed increases. The result is very high amplitude at a constant frequency, capable of destroying bearings and shaft within minutes. The transition from a manageable whirl to a destructive whip is the reason instability is never to be tolerated.<\/p>\n<h3>Steam whirl and aerodynamic instabilities<\/h3>\n<p><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/steam-whirl\/\">\u0cb8\u0ccd\u0c9f\u0cc0\u0cae\u0ccd \u0cb5\u0cb0\u0ccd\u0cb2\u0ccd<\/a> arises in steam turbines fitted with labyrinth seals, where aerodynamic cross-coupling forces in the seal clearances drive a sub-synchronous oscillation near a natural frequency under high pressure differentials. Swirl brakes, anti-swirl devices, and revised seal geometry are the typical fixes.<\/p>\n<h3>\u0cb6\u0cbe\u0cab\u0ccd\u0c9f\u0ccd \u0cb5\u0cbf\u0caa\u0ccd<\/h3>\n<p><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/shaft-whip\/\">\u0cb6\u0cbe\u0cab\u0ccd\u0c9f\u0ccd \u0cb5\u0cbf\u0caa\u0ccd<\/a> is a general label for several self-excited mechanisms, including internal (hysteretic) damping in the shaft material, dry-friction whip generated at seals or rubs, and aerodynamic or hydrodynamic cross-coupling forces. The broader family of <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/whirl\/\">whirl and whip<\/a> phenomena all share the same self-sustaining energy transfer.<\/p>\n<h2>3. Characteristics and Symptoms<\/h2>\n<h3>\u0cb5\u0cbf\u0cac\u0ccd\u0cb0\u0cc7\u0cb6\u0ca8\u0ccd \u0cb8\u0cb9\u0cbf<\/h3>\n<p>Instability produces a distinctive set of fingerprints in the data:<\/p>\n<ul>\n<li><strong>Sub-synchronous frequency:<\/strong> a dominant component below 1\u00d7 running speed, typically around 0.4\u20130.5\u00d7.<\/li>\n<li><strong>\u0cb5\u0cc7\u0c97 \u0cb8\u0ccd\u0cb5\u0cbe\u0ca4\u0c82\u0ca4\u0ccd\u0cb0\u0ccd\u0caf:<\/strong> once the instability locks on, the frequency stays put even as speed changes.<\/li>\n<li><strong>Rapid growth:<\/strong> amplitude rises exponentially the moment the threshold speed is crossed.<\/li>\n<li><strong>\u0cb9\u0cc6\u0c9a\u0ccd\u0c9a\u0cbf\u0ca8 \u0cb5\u0cc8\u0cb6\u0cbe\u0cb2\u0ccd\u0caf:<\/strong> can reach 2\u201310 times the amplitude of ordinary unbalance vibration.<\/li>\n<li><strong>\u0cae\u0cc1\u0c82\u0c9a\u0cbe\u0c9a\u0cbf \u0caa\u0cc2\u0cb0\u0ccd\u0cb5\u0cbe\u0cad\u0cbf\u0cae\u0cc1\u0c96:<\/strong> \u0c86 <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/orbit\/\">\u0cb6\u0cbe\u0cab\u0ccd\u0c9f\u0ccd \u0c95\u0c95\u0ccd\u0cb7\u0cc6<\/a> rotates in the same direction as the shaft itself.<\/li>\n<\/ul>\n<h3>Onset behaviour<\/h3>\n<p>Instability is governed by a threshold speed. Below it the system is stable and only forced vibration is present; at the threshold a small disturbance is enough to trigger the onset; and above it the instability develops rapidly. Early in the machine&#8217;s life it may flicker in and out intermittently before settling into a continuous, growing oscillation.<\/p>\n<h2>4. \u0ca8\u0cbf\u0cb0\u0ccd\u0ca3\u0cbe\u0caf\u0c95 \u0c97\u0cc1\u0cb0\u0cc1\u0ca4\u0cbf\u0c95\u0cc6<\/h2>\n<p>The key to diagnosis is separating self-excited instability from ordinary forced vibration. The contrast is stark:<\/p>\n<table border=\"1\" style=\"width:100%; border-collapse:collapse;\">\n<tr>\n<th>\u0cb2\u0c95\u0ccd\u0cb7\u0ca3<\/th>\n<th>Unbalance (forced)<\/th>\n<th>Instability (self-excited)<\/th>\n<\/tr>\n<tr>\n<td>\u0c86\u0cb5\u0cc3\u0ca4\u0ccd\u0ca4\u0cbf<\/td>\n<td>1\u00d7 \u0cb0\u0ca8\u0ccd \u0cb5\u0cc7\u0c97<\/td>\n<td>\u0c89\u0caa-\u0cb8\u0cbf\u0c82\u0c95\u0ccd\u0cb0\u0ccb\u0ca8\u0cb8\u0ccd (\u0cac\u0cb9\u0cc1\u0cae\u0c9f\u0ccd\u0c9f\u0cbf\u0c97\u0cc6 ~0.45\u00d7)<\/td>\n<\/tr>\n<tr>\n<td>Amplitude vs. speed<\/td>\n<td>\u0cb5\u0cc7\u0c97\u00b2 \u0c9c\u0cca\u0ca4\u0cc6 \u0cae\u0cc3\u0ca6\u0cc1\u0cb5\u0cbe\u0c97\u0cbf \u0cb9\u0cc6\u0c9a\u0ccd\u0c9a\u0cc1\u0ca4\u0ccd\u0ca4\u0ca6\u0cc6<\/td>\n<td>Sudden onset above a threshold<\/td>\n<\/tr>\n<tr>\n<td>\u0cb8\u0cae\u0ca4\u0ccb\u0cb2\u0ca8\u0c95\u0ccd\u0c95\u0cc6 \u0caa\u0ccd\u0cb0\u0ca4\u0cbf\u0c95\u0ccd\u0cb0\u0cbf\u0caf\u0cc6<\/td>\n<td>\u0c95\u0c82\u0caa\u0ca8 \u0c95\u0ca1\u0cbf\u0cae\u0cc6\u0caf\u0cbe\u0c97\u0cbf\u0ca6\u0cc6<\/td>\n<td>No improvement at all<\/td>\n<\/tr>\n<tr>\n<td>\u0c86\u0cb5\u0cb0\u0ccd\u0ca4\u0ca8 \u0cac\u0cbe\u0c82 \u0c97\u0ca4\u0cbf<\/td>\n<td>Tracks speed (constant order)<\/td>\n<td>Constant frequency (changing order)<\/td>\n<\/tr>\n<tr>\n<td>Shutdown behaviour<\/td>\n<td>\u0cb5\u0cc7\u0c97\u0ca6\u0cca\u0c82\u0ca6\u0cbf\u0c97\u0cc6 \u0c95\u0ca1\u0cbf\u0cae\u0cc6\u0caf\u0cbe\u0c97\u0cc1\u0ca4\u0ccd\u0ca4\u0ca6\u0cc6<\/td>\n<td>\u0cb5\u0cc7\u0c97 \u0c95\u0cc1\u0cb8\u0cbf\u0ca6 \u0ca8\u0c82\u0ca4\u0cb0\u0cb5\u0cc2 \u0cb8\u0ccd\u0cb5\u0cb2\u0ccd\u0caa \u0c95\u0cbe\u0cb2 \u0cae\u0cc1\u0c82\u0ca6\u0cc1\u0cb5\u0cb0\u0cbf\u0caf\u0cac\u0cb9\u0cc1\u0ca6\u0cc1<\/td>\n<\/tr>\n<\/table>\n<h3>Confirming instability<\/h3>\n<p>Several techniques settle the question decisively. <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/order-analysis\/\">\u0c86\u0cb0\u0ccd\u0ca1\u0cb0\u0ccd \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0ca3\u0cc6<\/a> shows the component holding a constant frequency while its order changes; a <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/waterfall-plot\/\">\u0cb5\u0cbe\u0c9f\u0cb0\u0ccd\u0cab\u0cbe\u0cb2\u0ccd \u0caa\u0ccd\u0cb2\u0cbe\u0c9f\u0ccd<\/a> reveals a frequency line that refuses to track speed; balancing has no effect on the sub-synchronous peak; and <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/orbit\/\">\u0c95\u0c95\u0ccd\u0cb7\u0cbe \u0cb5\u0cbf\u0cb6\u0ccd\u0cb2\u0cc7\u0cb7\u0ca3\u0cc6<\/a> shows forward precession at a natural frequency. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/kn\/%e0%b2%89%e0%b2%a4%e0%b3%8d%e0%b2%aa%e0%b2%a8%e0%b3%8d%e0%b2%a8\/balanset-1\/\">\u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cc6\u0c9f\u0ccd-1\u0c8e<\/a> is well suited to capturing this evidence in the field \u2014 recording the sub-synchronous component, its amplitude growth with speed, and the 1\u00d7 line side by side \u2014 so an engineer can distinguish a true instability from a simple unbalance before deciding whether balancing is even worth attempting. Confirming the fault is self-excited prevents the costly mistake of trying to balance a problem that balancing cannot solve.<\/p>\n<h2>5. Prevention and Mitigation<\/h2>\n<h3>\u0cb5\u0cbf\u0ca8\u0ccd\u0caf\u0cbe\u0cb8 \u0caa\u0cb0\u0cbf\u0c97\u0ca3\u0ca8\u0cc6\u0c97\u0cb3\u0cc1<\/h3>\n<ul>\n<li><strong>Adequate damping:<\/strong> bearing systems must provide enough <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/damping\/\">damping<\/a> to suppress the onset of instability.<\/li>\n<li><strong>\u0cac\u0cc6\u0cb0\u0cbf\u0c82\u0c97\u0ccd \u0c86\u0caf\u0ccd\u0c95\u0cc6:<\/strong> choose types and configurations with good inherent damping, such as tilting-pad or preloaded bearings.<\/li>\n<li><strong>\u0c95\u0ca0\u0cbf\u0ca8\u0ca4\u0cc6 \u0c85\u0ca8\u0cc1\u0c95\u0cc2\u0cb2\u0ca8:<\/strong> set sensible shaft-to-bearing <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/stiffness\/\">\u0c95\u0ca0\u0cbf\u0ca3\u0ca4\u0cc6<\/a> ratios.<\/li>\n<li><strong>Operating-speed margin:<\/strong> design the machine to run below its instability threshold speeds.<\/li>\n<\/ul>\n<h3>Bearing design solutions<\/h3>\n<ul>\n<li><strong>Tilting-pad bearings:<\/strong> inherently stable, the standard choice for high-speed service.<\/li>\n<li><strong>Pressure-dam bearings:<\/strong> modified geometry that raises effective damping.<\/li>\n<li><strong>Bearing preload:<\/strong> increases stiffness and damping and lifts the threshold speed.<\/li>\n<li><strong><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/squeeze-film-damper\/\">Squeeze-film dampers<\/a>:<\/strong> external damping elements fitted around the bearings.<\/li>\n<\/ul>\n<h3>Operational solutions<\/h3>\n<ul>\n<li><strong>\u0cb5\u0cc7\u0c97 \u0cae\u0cbf\u0ca4\u0cbf:<\/strong> cap the maximum speed below the threshold.<\/li>\n<li><strong>Load increase:<\/strong> heavier bearing loads can widen the stability margin.<\/li>\n<li><strong>Temperature control:<\/strong> oil temperature sets viscosity, and viscosity sets damping.<\/li>\n<li><strong>\u0ca8\u0cbf\u0cb0\u0c82\u0ca4\u0cb0 \u0ca8\u0cbf\u0c97\u0cbe\u0cb5\u0cb9\u0cbf\u0c95\u0cc6:<\/strong> early detection buys time to shut down before damage occurs.<\/li>\n<\/ul>\n<h2>6. Emergency Response and Stability Analysis<\/h2>\n<p>If instability appears during operation, the response sequence is unambiguous:<\/p>\n<ol>\n<li><strong>Act immediately:<\/strong> reduce speed or shut down at once.<\/li>\n<li><strong>Do not attempt balancing:<\/strong> it cannot correct instability and only wastes critical time.<\/li>\n<li><strong>Document the conditions:<\/strong> record the speed at onset, the frequency, and the amplitude progression.<\/li>\n<li><strong>Investigate the root cause:<\/strong> identify which mechanism \u2014 oil whirl, whip, steam whirl, or friction-driven whip \u2014 is at work.<\/li>\n<li><strong>Implement the correction:<\/strong> modify bearings, seals, or operating conditions accordingly.<\/li>\n<li><strong>Verify the fix:<\/strong> return to service cautiously, under close monitoring.<\/li>\n<\/ol>\n<p>Engineers predict and design out instability through formal stability analysis. This involves calculating the eigenvalues of the <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/rotor-bearing-system\/\">\u0cb0\u0ccb\u0c9f\u0cb0\u0ccd\u200c-\u0cac\u0cc7\u0cb0\u0cbf\u0c82\u0c97\u0ccd\u200c \u0cb5\u0ccd\u0caf\u0cb5\u0cb8\u0ccd\u0ca5\u0cc6\u0caf<\/a>: the real part of each eigenvalue signals stability \u2014 negative is stable, positive is unstable \u2014 while the calculation locates the threshold speeds at which stability changes. The work usually relies on specialised rotor-dynamics software and feeds back into design choices that guarantee adequate stability margins. Though far less common than unbalance or misalignment, rotor instability is among the most serious vibration conditions in rotating machinery, and recognising its mechanisms and symptoms is an essential skill for anyone working with high-speed equipment.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/\">\u2190 \u0cae\u0cc1\u0c96\u0ccd\u0caf \u0cb8\u0cc2\u0c9a\u0ccd\u0caf\u0cbe\u0c82\u0c95\u0c95\u0ccd\u0c95\u0cc6 \u0cb9\u0cbf\u0c82\u0ca4\u0cbf\u0cb0\u0cc1\u0c97\u0cbf<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about rotor instability, a dangerous self-excited vibration condition where energy from rotation sustains or amplifies oscillations, leading to potential catastrophic failure.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,111],"tags":[],"class_list":["post-219","glossary","type-glossary","status-publish","hentry","category-glossary","category-rotor-balancing"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary\/219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary\/219\/revisions"}],"predecessor-version":[{"id":101404,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary\/219\/revisions\/101404"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/media?parent=219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/categories?post=219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/tags?post=219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}