{"id":252,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/startup-vibration\/"},"modified":"2026-05-23T22:54:15","modified_gmt":"2026-05-23T22:54:15","slug":"startup-vibration","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ml\/glossary\/startup-vibration\/","title":{"rendered":"What is Startup Vibration? Transient Analysis"},"content":{"rendered":"<h1>Understanding Startup Vibration in Rotating Machinery<\/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\/ml\/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\/ml\/product\/balanset-1\/\" title=\"\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e\">\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\/ml\/product-category\/devices\/\" rel=\"tag\">\u0d09\u0d2a\u0d15\u0d30\u0d23\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/balanset-1\/\" title=\"\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e\">\u0d2a\u0d4b\u0d7c\u0d1f\u0d4d\u0d1f\u0d2c\u0d3f\u0d7e \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d31\u0d41\u0d02 \u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d05\u0d28\u0d32\u0d48\u0d38\u0d7c \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e<\/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 (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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/vibration-sensor\/\" title=\"\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c\">\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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/vibration-sensor\/\" title=\"\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c\">\u0d35\u0d48\u0d2c\u0d4d\u0d30\u0d47\u0d37\u0d7b \u0d38\u0d46\u0d7b\u0d38\u0d7c<\/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 (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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\">\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=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)\">\u0d12\u0d2a\u0d4d\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d\u0d15\u0d7d \u0d38\u0d46\u0d7b\u0d38\u0d7c (\u0d32\u0d47\u0d38\u0d7c \u0d1f\u0d3e\u0d15\u0d4d\u0d15\u0d4b\u0d2e\u0d40\u0d31\u0d4d\u0d31\u0d7c)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>124.00<\/span> + 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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/balanset-4\/\" title=\"\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-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\/ml\/product-category\/devices\/\" rel=\"tag\">\u0d09\u0d2a\u0d15\u0d30\u0d23\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/balanset-4\/\" title=\"\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-4\">\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-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 (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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/magnet-stand\/\" title=\"\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02\">\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=\"\u0d15\u0d3e\u0d28\u0d4d\u0d24\u0d02 \u0d05\u0d1f\u0d3f\u0d38\u0d4d\u0d25\u0d3e\u0d28\u0d02.\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/magnet-stand\/\" title=\"\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02\">\u0d2e\u0d3e\u0d17\u0d4d\u0d28\u0d31\u0d4d\u0d31\u0d3f\u0d15\u0d4d \u0d38\u0d4d\u0d31\u0d4d\u0d31\u0d3e\u0d7b\u0d21\u0d4d \u0d07\u0d7b\u0d38\u0d48\u0d38\u0d4d-60-\u0d15\u0d3f\u0d32\u0d4b\u0d17\u0d4d\u0d30\u0d3e\u0d02<\/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 (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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/reflective-tape\/\" title=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\">\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=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\" 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\/ml\/product-category\/parts\/\" rel=\"tag\">\u0d2d\u0d3e\u0d17\u0d19\u0d4d\u0d19\u0d7e<\/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\/ml\/product\/reflective-tape\/\" title=\"\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d\">\u0d2a\u0d4d\u0d30\u0d24\u0d3f\u0d2b\u0d32\u0d3f\u0d2a\u0d4d\u0d2a\u0d3f\u0d15\u0d4d\u0d15\u0d41\u0d28\u0d4d\u0d28 \u0d1f\u0d47\u0d2a\u0d4d\u0d2a\u0d4d<\/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 (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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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=\"\/ml\/wp-json\/wp\/v2\/glossary\/252?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\/ml\/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\/ml\/product\/dynamic-balancer-balanset-1a\/\" title=\"\u0d21\u0d48\u0d28\u0d3e\u0d2e\u0d3f\u0d15\u0d4d \u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d7c &quot;\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e&quot; \u0d12\u0d07\u0d0e\u0d02\">\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 kit contents with interface unit, sensors, tachometer and accessories\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1024x683.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-1536x1024.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-2048x1366.webp 2048w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-e1732998877834.webp 708w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div 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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>Startup vibration<\/strong> describes the <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/vibration\/\">vibration<\/a> behaviour of rotating machinery during the acceleration from rest up to normal operating speed. It covers both the expected <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/transient-vibration\/\">transient vibration<\/a> as the machine passes through its <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/critical-speed\/\">critical speeds<\/a> and any abnormal phenomena peculiar to the startup phase \u2014 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/thermal-bow\/\">thermal bow<\/a>, bearing instabilities, <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/rotor-rub\/\">rubs<\/a>, or mechanical settling. Monitoring it matters because many vibration problems reveal themselves most clearly during a startup, and the startup transient is frequently the most mechanically stressful moment in a machine&#8217;s whole operating cycle.<\/p>\n<h2>1. Definition: Why the Startup Transient Is Special<\/h2>\n<p>Steady-state monitoring captures a machine running at one fixed speed, but a startup sweeps the rotor through its entire speed range \u2014 exciting every <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/natural-frequency\/\">natural frequency<\/a> that lies below operating speed on the way up. Each pass through a <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/resonance\/\">resonance<\/a> momentarily amplifies the response, and the rotor is simultaneously cold, warming unevenly, and settling onto its bearings. That combination makes the startup a uniquely revealing \u2014 and uniquely demanding \u2014 window into machine health, which is why dedicated <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/run-up-analysis\/\">run-up analysis<\/a> is a standard tool for critical equipment.<\/p>\n<h2>2. Typical Startup Vibration Characteristics<\/h2>\n<h3>Normal Startup Progression<\/h3>\n<p>In a healthy machine the vibration during startup follows a predictable pattern that the analyst can use as a yardstick.<\/p>\n<h4>Initial Phase (0\u201320% Speed)<\/h4>\n<ul>\n<li>Very low vibration from <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/unbalance\/\">unbalance<\/a>, because centrifugal force grows with the square of speed.<\/li>\n<li>Any significant vibration at this point points to a mechanical problem or thermal bow.<\/li>\n<li>The slow-roll reading provides a baseline of the rotor&#8217;s purely mechanical condition (e.g. residual bow or runout).<\/li>\n<\/ul>\n<h4>Acceleration Through Critical Speeds<\/h4>\n<ul>\n<li>Amplitude climbs as each critical speed is approached.<\/li>\n<li>It peaks at the critical speed, where the rotor is in resonance.<\/li>\n<li>It falls away rapidly as speed continues past the critical.<\/li>\n<li>A roughly 180\u00b0 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/phase\/\">phase<\/a> shift accompanies the passage through each critical speed \u2014 a defining signature.<\/li>\n<li>Multiple peaks appear if several critical speeds lie below operating speed.<\/li>\n<\/ul>\n<h4>Approach to Operating Speed<\/h4>\n<ul>\n<li>Vibration settles to a steady-state level.<\/li>\n<li>It is dominated by the 1\u00d7 component from <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/residual-unbalance\/\">residual unbalance<\/a>.<\/li>\n<li>Thermal stabilisation may cause gradual changes over the first 30\u201360 minutes of running.<\/li>\n<\/ul>\n<h2>3. Common Startup Vibration Problems<\/h2>\n<h3>Thermal Bow<\/h3>\n<p>Thermal bow is the most common startup-specific issue:<\/p>\n<ul>\n<li><strong>Symptom:<\/strong> high vibration during initial acceleration that gradually decreases as the machine warms through.<\/li>\n<li><strong>Cause:<\/strong> asymmetric heating creating a temporary curvature of the shaft.<\/li>\n<li><strong>Frequency:<\/strong> 1\u00d7 synchronous.<\/li>\n<li><strong>Behaviour:<\/strong> high even at slow-roll speeds, then decreasing as thermal equilibrium is reached.<\/li>\n<li><strong>\u0d2a\u0d30\u0d3f\u0d39\u0d3e\u0d30\u0d02:<\/strong> extended warm-up procedures and turning-gear operation before start.<\/li>\n<\/ul>\n<h3>Excessive Critical-Speed Vibration<\/h3>\n<ul>\n<li><strong>Symptom:<\/strong> very high peaks when passing through a critical speed.<\/li>\n<li><strong>Causes:<\/strong> poor <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/damping\/\">damping<\/a>, high unbalance, or operating too close to a critical speed.<\/li>\n<li><strong>Risk:<\/strong> potential damage to bearings and seals on every startup.<\/li>\n<li><strong>\u0d2a\u0d30\u0d3f\u0d39\u0d3e\u0d30\u0d02:<\/strong> improve balance, increase the acceleration rate through critical zones, and add damping.<\/li>\n<\/ul>\n<h3>Rub During Acceleration<\/h3>\n<ul>\n<li><strong>Symptom:<\/strong> sudden, erratic vibration and the appearance of <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/sub-synchronous\/\">sub-synchronous<\/a> components.<\/li>\n<li><strong>Cause:<\/strong> insufficient clearances, or excessive critical-speed vibration driving the rotor into contact.<\/li>\n<li><strong>Risk:<\/strong> localised thermal damage and seal destruction.<\/li>\n<li><strong>\u0d2a\u0d30\u0d3f\u0d39\u0d3e\u0d30\u0d02:<\/strong> verify clearances, improve balance, and slow the acceleration.<\/li>\n<\/ul>\n<h3>Bearing Instability During Startup<\/h3>\n<ul>\n<li><strong>Symptom:<\/strong> sub-synchronous vibration developing during acceleration, often near half running speed.<\/li>\n<li><strong>Cause:<\/strong> a <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/journal-bearing\/\">journal bearing<\/a> not yet at operating temperature, so its oil film stiffness and damping are not yet optimal \u2014 a precursor to <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/oil-whirl\/\">oil whirl<\/a>.<\/li>\n<li><strong>Behaviour:<\/strong> may disappear once the bearing warms up.<\/li>\n<li><strong>\u0d2a\u0d30\u0d3f\u0d39\u0d3e\u0d30\u0d02:<\/strong> an extended warm-up at intermediate speed before full acceleration.<\/li>\n<\/ul>\n<h2>4. Designing the Startup Procedure<\/h2>\n<h3>Optimising the Acceleration Rate<\/h3>\n<p>The acceleration profile should be tailored to the machine&#8217;s own dynamics rather than applied uniformly.<\/p>\n<h4>Slow Acceleration Zones<\/h4>\n<ul>\n<li><strong>Initial roll (0\u201310% speed):<\/strong> very slow, to detect thermal bow or mechanical issues.<\/li>\n<li><strong>Below the first critical:<\/strong> a moderate rate to allow thermal warm-up.<\/li>\n<li><strong>Above all criticals:<\/strong> acceleration to operating speed can be brisker.<\/li>\n<\/ul>\n<h4>Rapid Pass-Through Zones<\/h4>\n<ul>\n<li><strong>Critical-speed ranges:<\/strong> accelerate quickly through roughly \u00b115\u201320% around each critical speed.<\/li>\n<li><strong>Typical rate:<\/strong> 2\u20135\u00d7 the normal acceleration rate.<\/li>\n<li><strong>Purpose:<\/strong> minimise dwell time at resonance and limit the build-up of vibration amplitude.<\/li>\n<\/ul>\n<h4>Hold Points<\/h4>\n<ul>\n<li><strong>Thermal-soak speeds:<\/strong> hold at 30%, 50% and 70% for large turbines.<\/li>\n<li><strong>Duration:<\/strong> 10\u201330 minutes at each hold.<\/li>\n<li><strong>Purpose:<\/strong> allow thermal stabilisation and reduce thermal gradients.<\/li>\n<li><strong>Vibration check:<\/strong> confirm vibration is acceptable before proceeding.<\/li>\n<\/ul>\n<h2>5. Monitoring and Acceptance Criteria<\/h2>\n<h3>Real-Time Monitoring<\/h3>\n<p>During a startup, watch:<\/p>\n<ul>\n<li><strong>Overall vibration level:<\/strong> it should not exceed the <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/alarm-level\/\">alarm limit<\/a> at any speed.<\/li>\n<li><strong>Bearing temperatures:<\/strong> a gradual rise is acceptable; a rapid rise signals trouble.<\/li>\n<li><strong>Speed tracking:<\/strong> confirm the machine is accelerating smoothly.<\/li>\n<li><strong>Phase angle:<\/strong> track it for unexpected changes that betray mechanical problems.<\/li>\n<\/ul>\n<h3>Acceptance Criteria<\/h3>\n<ul>\n<li><strong>Critical-speed peaks:<\/strong> should match predictions to within \u00b110\u201315%.<\/li>\n<li><strong>Peak amplitudes:<\/strong> should stay within design limits, typically defined in the equipment specification and benchmarked against <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/iso-20816-1\/\">ISO 20816<\/a> severity guidance.<\/li>\n<li><strong>Steady-state vibration:<\/strong> should settle to acceptable levels after thermal stabilisation.<\/li>\n<li><strong>Repeatability:<\/strong> successive startups should behave consistently.<\/li>\n<\/ul>\n<h2>6. Troubleshooting Abnormal Startup Vibration<\/h2>\n<h3>High Initial Vibration<\/h3>\n<p>Possible causes:<\/p>\n<ul>\n<li>Thermal bow left from a previous run or shutdown.<\/li>\n<li>A mechanical bow or <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/bent-shaft\/\">bent shaft<\/a>.<\/li>\n<li>Bearing problems \u2014 <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/bearing-wear\/\">wear<\/a> \u0d05\u0d25\u0d35\u0d3e <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/misalignment\/\">misalignment<\/a>.<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/looseness\/\">Looseness<\/a> or other mechanical defects.<\/li>\n<\/ul>\n<h3>Vibration Increasing During Warm-Up<\/h3>\n<p>Possible causes:<\/p>\n<ul>\n<li>A developing thermal bow from asymmetric heating.<\/li>\n<li>Thermal growth disturbing alignment.<\/li>\n<li>Bearing clearances changing with temperature.<\/li>\n<li>Thermal expansion closing clearances and leading to rubs.<\/li>\n<\/ul>\n<h3>Erratic Vibration During Acceleration<\/h3>\n<p>Possible causes:<\/p>\n<ul>\n<li>Rubbing or intermittent contact.<\/li>\n<li>Loose components settling or shifting.<\/li>\n<li><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/coupling-defects\/\">Coupling<\/a> problems.<\/li>\n<li>Variable bearing behaviour.<\/li>\n<\/ul>\n<h2>7. Documentation and Baseline Data<\/h2>\n<h3>Initial Commissioning<\/h3>\n<p>Establish a baseline startup signature:<\/p>\n<ul>\n<li>Record the complete run-up data.<\/li>\n<li>Generate <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/bode-plot\/\">Bode plots<\/a> and <a href=\"https:\/\/vibromera.eu\/ml\/glossary\/waterfall-plot\/\">waterfall plots<\/a>.<\/li>\n<li>Document every critical speed and its peak amplitude.<\/li>\n<li>Archive it as the reference for all future comparisons.<\/li>\n<\/ul>\n<h3>Periodic Comparison<\/h3>\n<ul>\n<li>Compare each current startup against the baseline.<\/li>\n<li>Watch for shifts in critical-speed locations, which indicate mechanical changes such as a developing crack or altered support stiffness.<\/li>\n<li>Track changes in peak amplitude, which indicate unbalance or damping changes.<\/li>\n<li>Look for new vibration components absent from the baseline.<\/li>\n<\/ul>\n<p>Capturing a clean run-up means logging amplitude, phase and speed continuously as the rotor accelerates \u2014 exactly the synchronised measurement a portable two-channel analyser is built for. The <a href=\"https:\/\/vibromera.eu\/ml\/product\/balanset-1\/\">\u0d2c\u0d3e\u0d32\u0d7b\u0d38\u0d46\u0d31\u0d4d\u0d31\u0d4d-1\u0d0e<\/a> records 1\u00d7 amplitude and phase against shaft speed during the startup, so a technician can locate critical speeds, confirm the 180\u00b0 phase reversal through each one, and \u2014 when the trouble is a 1\u00d7 unbalance or thermal-bow problem rather than a structural fault \u2014 balance the rotor in its own bearings and re-run to verify the startup peaks have dropped. To anticipate where those peaks should fall, a <a href=\"https:\/\/vibromera.eu\/ml\/calculators\/rotor-critical-speed\/\">rotor critical-speed calculator<\/a> estimates the shaft&#8217;s natural frequency, while a <a href=\"https:\/\/vibromera.eu\/ml\/calculators\/rotor-acceleration-time\/\">rotor acceleration-time calculator<\/a> helps plan how quickly the drive can sweep through a resonance zone.<\/p>\n<p>Startup vibration analysis offers a view of machine health that steady-state monitoring alone cannot provide. Because so many developing faults announce themselves first during acceleration, trending the startup signature over time is one of the most valuable predictive-maintenance tools available for critical rotating equipment.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ml\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about startup vibration, the characteristic vibration behavior during machine acceleration including thermal bow effects, critical speed passages, and transient phenomena.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-252","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/252","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/252\/revisions"}],"predecessor-version":[{"id":101411,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/glossary\/252\/revisions\/101411"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/media?parent=252"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/categories?post=252"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ml\/wp-json\/wp\/v2\/tags?post=252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}