{"id":20635,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/blade-passing-frequency\/"},"modified":"2026-05-23T22:30:55","modified_gmt":"2026-05-23T22:30:55","slug":"blade-passing-frequency","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/kn\/glossary\/blade-passing-frequency\/","title":{"rendered":"Blade Pass Frequency (BPF) in Vibration Analysis"},"content":{"rendered":"<h1>Blade Pass Frequency (BPF) in Vibration Analysis<\/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 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\/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 (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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/20635?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 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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 (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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/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 \u0c9f\u0ccd\u0caf\u0cbe\u0c95\u0ccb\u0cae\u0cc0\u0c9f\u0cb0\u0ccd)\" 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\/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 \u0c9f\u0ccd\u0caf\u0cbe\u0c95\u0ccb\u0cae\u0cc0\u0c9f\u0cb0\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>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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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 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\/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 (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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/20635?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 (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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/20635?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 (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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/20635?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.jpg\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A kit contents with interface unit, sensors, tachometer and accessories\" srcset=\"\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" data-srcset=\"\" \/>\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\/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\">\u0ca1\u0cc8\u0ca8\u0cbe\u0cae\u0cbf\u0c95\u0ccd \u0cac\u0ccd\u0caf\u0cbe\u0cb2\u0cc6\u0ca8\u0ccd\u0cb8\u0cb0\u0ccd &quot;Balanset-1A&quot; OEM<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,735.00<\/span> + 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=\"\/kn\/wp-json\/wp\/v2\/glossary\/20635?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\/20635?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>Blade Pass Frequency (BPF)<\/strong> is a prominent frequency component found in the vibration signature of aerodynamic and hydrodynamic machines such as <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/fan-defects\/\">fans<\/a>, <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/pump-defects\/\">pumps<\/a>, blowers, and compressors. It represents the rate at which the rotating blades or vanes of an impeller pass a fixed point \u2014 a cutoff (or cutwater) vane, a diffuser, or the sensor location. Each blade passage drives a discrete pressure pulsation, and the sum of those pulses produces a clean, predictable vibration peak that an analyst can calculate in advance and watch over time. Because BPF is tied directly to <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/running-speed\/\">running speed<\/a> and blade count, it is one of the most diagnostically useful features in the <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/spectrum\/\">vibration spectrum<\/a> of any bladed machine.<\/p>\n<h2>1. Definition: What is Blade Pass Frequency?<\/h2>\n<p>BPF arises from a fundamentally aerodynamic or hydraulic interaction, not a mechanical defect. As each blade sweeps past a stationary obstruction \u2014 most often the volute cutwater of a pump or the housing tongue of a fan \u2014 it momentarily compresses and then releases the fluid, sending a pressure pulse into the casing and the surrounding structure. Repeat that for every blade, every revolution, and the result is a steady tone at a frequency set purely by how many blades there are and how fast they turn. This is why BPF is sometimes called vane pass frequency on pumps: the physics is identical whether the bladed element is a fan rotor or a pump impeller. It belongs to the family of <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/aerodynamic-forces\/\">aerodynamic forces<\/a> and <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/hydraulic-forces\/\">hydraulic forces<\/a> that excite a machine in normal service.<\/p>\n<h2>2. How to Calculate Blade Pass Frequency<\/h2>\n<p>BPF is straightforward to calculate; it is simply the product of the machine&#8217;s rotational speed and the number of blades or vanes on its impeller:<\/p>\n<blockquote><p><strong>BPF = Number of Blades \u00d7 Rotational Speed<\/strong><\/p><\/blockquote>\n<p>For example, a fan with 7 blades rotating at 1,800 RPM has a BPF of:<\/p>\n<p>BPF = 7 blades \u00d7 1,800 RPM = 12,600 CPM (cycles per minute)<\/p>\n<p>To convert this to hertz (Hz), divide by 60:<\/p>\n<p>BPF = 12,600 CPM \u00f7 60 = 210 Hz<\/p>\n<p>One subtlety worth remembering: when the blade count and the number of stationary obstructions share a common factor, the effective pulsation pattern changes, and some designs deliberately use a prime number of vanes against a single cutwater to keep BPF a clean, isolated peak. If you would rather not do the arithmetic by hand for every machine on a route, our free <a href=\"https:\/\/vibromera.eu\/kn\/calculators\/blade-pass-frequency\/\">Blade Pass Frequency Calculator<\/a> converts blade count and speed straight into BPF, and the <a href=\"https:\/\/vibromera.eu\/kn\/calculators\/harmonic-frequency-calculator\/\">Harmonic Frequency Calculator<\/a> lays out the running-speed orders so you can spot where BPF and its <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/harmonics\/\">harmonics<\/a> will land relative to other components.<\/p>\n<h2>3. Why is BPF Important in Machine Diagnostics?<\/h2>\n<p>Vibration at the blade pass frequency is a normal and expected characteristic of any machine that moves air or fluid with blades \u2014 its mere presence is not a fault. What matters diagnostically is the <em>amplitude<\/em> at that frequency, which is a sensitive indicator of the machine&#8217;s mechanical and aerodynamic condition. A significant rise in BPF amplitude, or the sudden appearance of strong harmonics, frequently signals a developing problem long before it becomes a failure. This is why BPF amplitude is a prime candidate for routine <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/trending\/\">trending<\/a> in a <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/condition-monitoring\/\">condition monitoring<\/a> programme.<\/p>\n<h2>4. Common Problems Indicated by High BPF Amplitude<\/h2>\n<p>Elevated vibration at 1\u00d7BPF or its multiples (2\u00d7BPF, 3\u00d7BPF, and so on) can be a symptom of several distinct issues:<\/p>\n<ul>\n<li><strong>Aerodynamic or hydraulic issues:<\/strong> uneven or turbulent flow at the inlet or outlet is a primary cause, arising from blockages, poor ducting, or running the machine far from its Best Efficiency Point (BEP). In pumps this can shade into <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/cavitation\/\">cavitation<\/a> \u0c85\u0ca5\u0cb5\u0cbe <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/recirculation\/\">recirculation<\/a> when the operating point drifts too far.<\/li>\n<li><strong>Rotor or impeller imbalance:<\/strong> although <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/unbalance\/\">unbalance<\/a> shows up chiefly at 1\u00d7 running speed, a non-uniform mass distribution can also produce uneven blade loading that raises BPF.<\/li>\n<li><strong>Blade damage or wear:<\/strong> a cracked, bent, chipped, or eroded blade disrupts the uniform pressure pulsations, causing a marked rise in BPF vibration \u2014 a common consequence of <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/impeller-defects\/\">impeller defects<\/a>.<\/li>\n<li><strong>Improper clearances:<\/strong> an eccentric rotor position within the housing, or incorrect clearance between the blade tips and the casing, produces large pressure pulses as the blades sweep past the tightest point. This links closely to <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/eccentricity\/\">eccentricity<\/a> in the rotor-housing geometry.<\/li>\n<li><strong>Structural resonance:<\/strong> if BPF or one of its harmonics coincides with a <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/natural-frequency\/\">natural frequency<\/a> of the machine, its piping, or its foundation, the vibration is dramatically amplified through <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/structural-resonance\/\">structural resonance<\/a>.<\/li>\n<\/ul>\n<h2>5. Harmonics of Blade Pass Frequency (2\u00d7BPF, 3\u00d7BPF)<\/h2>\n<p>The presence of strong BPF harmonics usually points to a more severe problem, or to a sharper, less sinusoidal pressure pulse in the flow. A severely bent blade, or a significant obstruction sitting close to the impeller, produces a pulse that departs from a clean sine wave; in the frequency domain that translates into multiple harmonics rising above the noise. Reading the relative heights of 1\u00d7BPF, 2\u00d7BPF, and 3\u00d7BPF therefore gives the analyst a feel for how &#8220;peaky&#8221; and how serious the underlying disturbance has become.<\/p>\n<h2>6. Analysis Techniques<\/h2>\n<p>Diagnosing BPF-related issues follows a clear sequence:<\/p>\n<ol>\n<li><strong>Calculate BPF:<\/strong> first determine the theoretical value from the known blade count and speed, so you know exactly where to look.<\/li>\n<li><strong>Spectrum analysis:<\/strong> examine the <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/fft\/\">FFT<\/a> spectrum to identify peaks at 1\u00d7BPF and its harmonics, and to gauge how they stand out against the broadband noise floor.<\/li>\n<li><strong>Trending:<\/strong> compare the current BPF amplitude against historical <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/baseline\/\">baseline<\/a> data; a sudden or gradual rise is a clear sign of deterioration.<\/li>\n<li><strong>Phase analysis:<\/strong> with a dual-channel analyser, <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/phase\/\">phase<\/a> readings help separate a problem rooted in rotor motion from one rooted in the structure.<\/li>\n<\/ol>\n<p>That last step is where a true two-channel instrument earns its keep in the field. A portable analyser and balancer 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> captures amplitude and phase simultaneously on two channels at operating speed, letting an engineer confirm whether an elevated peak near BPF is genuinely aerodynamic or is in fact a 1\u00d7 <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/imbalance\/\">imbalance<\/a> that can be corrected by <a href=\"https:\/\/vibromera.eu\/kn\/glossary\/balancing\/\">\u0cb8\u0cae\u0ca4\u0ccb\u0cb2\u0ca8<\/a> the rotor in place. By monitoring the blade pass frequency systematically, maintenance teams gain valuable insight into the health of their critical rotating equipment and can identify potential failures well before they occur.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/kn\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about Blade Pass Frequency (BPF) and its importance in diagnosing issues in fans, pumps, and compressors. Understand the BPF formula and what high BPF vibration indicates.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-20635","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary\/20635","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\/20635\/revisions"}],"predecessor-version":[{"id":101254,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/glossary\/20635\/revisions\/101254"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/media?parent=20635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/categories?post=20635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/kn\/wp-json\/wp\/v2\/tags?post=20635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}