{"id":247,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/spectral-leakage\/"},"modified":"2026-05-23T22:15:32","modified_gmt":"2026-05-23T22:15:32","slug":"spectral-leakage","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/vi\/glossary\/spectral-leakage\/","title":{"rendered":"R\u00f2 r\u1ec9 quang ph\u1ed5 trong ph\u00e2n t\u00edch FFT l\u00e0 g\u00ec?"},"content":{"rendered":"<h1>T\u00ecm hi\u1ec3u v\u1ec1 r\u00f2 r\u1ec9 ph\u1ed5<\/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\/vi\/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\/vi\/product\/balanset-1\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"B\u1ed9 \u0111\u1ea7y \u0111\u1ee7 m\u00e1y c\u00e2n b\u1eb1ng v\u00e0 ph\u00e2n t\u00edch rung \u0111\u1ed9ng c\u1ea7m tay Balanset-1A\" 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\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/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\/vi\/product\/balanset-1\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A\">M\u00e1y c\u00e2n b\u1eb1ng di \u0111\u1ed9ng &amp; M\u00e1y ph\u00e2n t\u00edch rung \u0111\u1ed9ng Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>1,975.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/vibration-sensor\/\" title=\"C\u1ea3m bi\u1ebfn rung\">\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=\"C\u1eadn c\u1ea3nh c\u1ea3m bi\u1ebfn rung Balanset-1A\" 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\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/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\/vi\/product\/vibration-sensor\/\" title=\"C\u1ea3m bi\u1ebfn rung\">C\u1ea3m bi\u1ebfn rung<\/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> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\">\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=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\" 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\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/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\/vi\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)\">C\u1ea3m bi\u1ebfn quang h\u1ecdc (M\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 laser)<\/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> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"B\u1ed9 d\u1ee5ng c\u1ee5 c\u00e2n b\u1eb1ng r\u00f4to Vibromera: h\u1ed9p \u0111\u1ef1ng, b\u1ed9 \u0111i\u1ec1u ch\u1ec9nh t\u00edn hi\u1ec7u \u0111a k\u00eanh, m\u00e1y ph\u00e2n t\u00edch c\u1ea7m tay, \u0111\u1ebf t\u1eeb, c\u1ea3m bi\u1ebfn rung v\u00e0 d\u00e2y c\u00e1p xo\u1eafn.\" 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\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/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\/vi\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>6,803.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/magnet-stand\/\" title=\"\u0110\u1ebf t\u1eeb Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\u0110\u1ebf nam ch\u00e2m.\" 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\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/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\/vi\/product\/magnet-stand\/\" title=\"\u0110\u1ebf t\u1eeb Insize-60-kgf\">\u0110\u1ebf t\u1eeb Insize-60-kgf<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">\u20ac<\/span>46.00<\/span> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/reflective-tape\/\" title=\"B\u0103ng ph\u1ea3n quang\">\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=\"B\u0103ng ph\u1ea3n quang\" 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\/vi\/product-category\/parts\/\" rel=\"tag\">Ph\u1ee5 t\u00f9ng<\/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\/vi\/product\/reflective-tape\/\" title=\"B\u0103ng ph\u1ea3n quang\">B\u0103ng ph\u1ea3n quang<\/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> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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\/vi\/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\/vi\/product\/dynamic-balancer-balanset-1a\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d 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=\"N\u1ed9i dung b\u1ed9 s\u1ea3n ph\u1ea9m Balanset-1A bao g\u1ed3m thi\u1ebft b\u1ecb giao di\u1ec7n, c\u1ea3m bi\u1ebfn, m\u00e1y \u0111o t\u1ed1c \u0111\u1ed9 v\u00e0 c\u00e1c ph\u1ee5 ki\u1ec7n\" 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 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\/vi\/product-category\/devices\/\" rel=\"tag\">Thi\u1ebft b\u1ecb<\/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\/vi\/product\/dynamic-balancer-balanset-1a\/\" title=\"M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d OEM\">M\u00e1y c\u00e2n b\u1eb1ng \u0111\u1ed9ng \u201cBalanset-1A\u201d 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> + Thu\u1ebf GTGT (n\u1ebfu c\u00f3)<\/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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng\" 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=\"\/vi\/wp-json\/wp\/v2\/glossary\/247?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=\"Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d \u0111\u00e3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a b\u1ea1n\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Th\u00eam v\u00e0o gi\u1ecf h\u00e0ng<\/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>R\u00f2 r\u1ec9 ph\u1ed5<\/strong> l\u00e0 m\u1ed9t d\u1ea1ng sai s\u1ed1 \u0111o l\u01b0\u1eddng ph\u00e1t sinh trong qu\u00e1 tr\u00ecnh <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/fft\/\">Bi\u1ebfn \u0111\u1ed5i Fourier nhanh (FFT)<\/a> ph\u00e2n t\u00edch t\u00edn hi\u1ec7u. \u0110\u00f3 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng \u201cph\u00e2n t\u00e1n\u201d, hay s\u1ef1 lan t\u1ecfa, n\u0103ng l\u01b0\u1ee3ng t\u1eeb m\u1ed9t \u0111\u1ec9nh t\u1ea7n s\u1ed1 ri\u00eang l\u1ebb th\u00e0nh <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectrum\/\">c\u1ee7a Spectrum<\/a> c\u00e1c \u00f4 t\u1ea7n s\u1ed1 li\u1ec1n k\u1ec1. Hi\u1ec7n t\u01b0\u1ee3ng lan t\u1ecfa n\u00e0y l\u00e0m bi\u1ebfn d\u1ea1ng c\u1ea3 bi\u00ean \u0111\u1ed9 l\u1eabn t\u1ea7n s\u1ed1 bi\u1ec3u ki\u1ebfn c\u1ee7a th\u00e0nh ph\u1ea7n dao \u0111\u1ed9ng th\u1ef1c, v\u00e0 c\u00f3 th\u1ec3 che l\u1ea5p c\u00e1c t\u00edn hi\u1ec7u y\u1ebfu h\u01a1n ho\u1eb7c d\u1eabn \u0111\u1ebfn ch\u1ea9n \u0111o\u00e1n kh\u00f4ng ch\u00ednh x\u00e1c. Vi\u1ec7c hi\u1ec3u r\u00f5 hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 tin t\u01b0\u1edfng v\u00e0o b\u1ea5t k\u1ef3 k\u1ebft qu\u1ea3 FFT n\u00e0o.<\/p>\n<h2>1. \u0110\u1ecbnh ngh\u0129a: R\u00f2 r\u1ec9 ph\u1ed5 l\u00e0 g\u00ec?<\/h2>\n<p>Trong m\u1ed9t th\u1ebf gi\u1edbi l\u00fd t\u01b0\u1edfng, m\u1ed9t s\u00f3ng sin thu\u1ea7n t\u00fay \u1edf m\u1ed9t t\u1ea7n s\u1ed1 s\u1ebd xu\u1ea5t hi\u1ec7n tr\u00ean ph\u1ed5 d\u01b0\u1edbi d\u1ea1ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng duy nh\u1ea5t, m\u1ecfng v\u00f4 h\u1ea1n. Thay v\u00e0o \u0111\u00f3, hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 ph\u1ed5 l\u1ea1i x\u1ea3y ra trong th\u1ebf gi\u1edbi th\u1ef1c: n\u0103ng l\u01b0\u1ee3ng l\u1ebd ra ph\u1ea3i n\u1eb1m trong m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/fft\/\">FFT<\/a> D\u1eef li\u1ec7u t\u1eeb th\u00f9ng \u201cr\u00f2 r\u1ec9\u201d sang c\u00e1c th\u00f9ng l\u00e2n c\u1eadn, t\u1ea1o ra m\u1ed9t \u0111\u1ec9nh c\u00f3 ph\u1ea7n ch\u00e2n r\u1ed9ng thay v\u00ec m\u1ed9t \u0111\u1ec9nh nh\u1ecdn. K\u1ebft qu\u1ea3 l\u00e0 ph\u1ed5 t\u00edn hi\u1ec7u tr\u00f4ng m\u1edd nh\u1ea1t v\u00e0 nhi\u1ec5u h\u01a1n so v\u1edbi nh\u1eefng g\u00ec l\u00fd thuy\u1ebft v\u1eadt l\u00fd c\u01a1 b\u1ea3n cho ph\u00e9p, \u0111i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng khi b\u1ea1n c\u1ed1 g\u1eafng t\u00e1ch m\u1ed9t t\u00edn hi\u1ec7u l\u1ed7i nh\u1ecf kh\u1ecfi m\u1ed9t \u0111\u1ec9nh l\u1edbn g\u1ea7n \u0111\u00f3.<\/p>\n<h2>2. Nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5: S\u1ef1 gi\u00e1n \u0111o\u1ea1n<\/h2>\n<p>S\u1ef1 r\u00f2 r\u1ec9 ph\u1ed5 xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c vi ph\u1ea1m gi\u1ea3 \u0111\u1ecbnh c\u01a1 b\u1ea3n c\u1ee7a FFT. Thu\u1eadt to\u00e1n gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng kh\u1ed1i h\u1eefu h\u1ea1n c\u1ee7a <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/time-waveform\/\">d\u1ea1ng s\u00f3ng theo th\u1eddi gian<\/a> D\u1eef li\u1ec7u m\u00e0 n\u00f3 ph\u00e2n t\u00edch l\u00e0 m\u1ed9t chu k\u1ef3 l\u1eb7p l\u1ea1i ho\u00e0n h\u1ea3o c\u1ee7a m\u1ed9t t\u00edn hi\u1ec7u tu\u1ea7n ho\u00e0n. \u0110\u1ec3 \u0111i\u1ec1u n\u00e0y \u0111\u00fang, gi\u00e1 tr\u1ecb c\u1ee7a t\u00edn hi\u1ec7u \u1edf \u0111i\u1ec3m cu\u1ed1i c\u00f9ng c\u1ee7a kh\u1ed1i ph\u1ea3i ho\u00e0n to\u00e0n tr\u00f9ng kh\u1edbp v\u1edbi gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 \u1edf \u0111i\u1ec3m \u0111\u1ea7u ti\u00ean, nh\u1edd \u0111\u00f3 kh\u1ed1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i li\u00ean t\u1ee5c t\u1eeb \u0111\u1ea7u \u0111\u1ebfn cu\u1ed1i m\u1ed9t c\u00e1ch li\u1ec1n m\u1ea1ch.<\/p>\n<p>Tr\u00ean th\u1ef1c t\u1ebf, khi \u0111o m\u1ed9t t\u00edn hi\u1ec7u dao \u0111\u1ed9ng th\u1ef1c t\u1ebf, vi\u1ec7c thu \u0111\u01b0\u1ee3c m\u1ed9t \u0111o\u1ea1n t\u00edn hi\u1ec7u ch\u1ee9a ch\u00ednh x\u00e1c m\u1ed9t s\u1ed1 nguy\u00ean chu k\u1ef3 l\u00e0 \u0111i\u1ec1u g\u1ea7n nh\u01b0 kh\u00f4ng th\u1ec3 <em>m\u1ed7i<\/em> c\u00f3 th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1. K\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t <strong>s\u1ef1 gi\u00e1n \u0111o\u1ea1n<\/strong>: ph\u1ea7n cu\u1ed1i c\u1ee7a t\u00edn hi\u1ec7u thu \u0111\u01b0\u1ee3c kh\u00f4ng kh\u1edbp v\u1edbi ph\u1ea7n \u0111\u1ea7u. FFT gi\u1ea3i th\u00edch s\u1ef1 nh\u1ea3y v\u1ecdt \u0111\u1ed9t ng\u1ed9t n\u00e0y nh\u01b0 m\u1ed9t dao \u0111\u1ed9ng tho\u00e1ng qua t\u1ea7n s\u1ed1 cao \u2014 gi\u1ed1ng nh\u01b0 m\u1ed9t c\u00fa va ch\u1ea1m \u2014 v\u00e0 dao \u0111\u1ed9ng tho\u00e1ng qua nh\u00e2n t\u1ea1o \u0111\u00f3 mang theo n\u0103ng l\u01b0\u1ee3ng v\u1ed1n kh\u00f4ng t\u1ed3n t\u1ea1i trong t\u00edn hi\u1ec7u ban \u0111\u1ea7u. Ch\u00ednh n\u0103ng l\u01b0\u1ee3ng gi\u1ea3 n\u00e0y l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra s\u1ef1 r\u00f2 r\u1ec9 tr\u00ean m\u1ed9t d\u1ea3i t\u1ea7n s\u1ed1 r\u1ed9ng trong ph\u1ed5 thu \u0111\u01b0\u1ee3c.<\/p>\n<blockquote><p>Kh\u1ed1i d\u1eef li\u1ec7u c\u00e0ng ng\u1eafn v\u00e0 hai \u0111\u1ec9nh th\u1ef1c c\u00e0ng g\u1ea7n nhau, hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 c\u00e0ng g\u00e2y h\u1ea1i \u2014 \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9, \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 v\u00e0 \u0111\u1ed9 d\u00e0i kh\u1ed1i lu\u00f4n \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp c\u00f9ng nhau.<\/p><\/blockquote>\n<h2>3. \u1ea2nh h\u01b0\u1edfng c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 ph\u1ed5<\/h2>\n<p>Vi\u1ec7c l\u00e3ng ph\u00ed n\u0103ng l\u01b0\u1ee3ng g\u00e2y ra hai t\u00e1c \u0111\u1ed9ng ti\u00eau c\u1ef1c ch\u00ednh:<\/p>\n<ol>\n<li><strong>\u0110\u1ed9 ch\u00ednh x\u00e1c bi\u00ean \u0111\u1ed9 gi\u1ea3m:<\/strong> N\u0103ng l\u01b0\u1ee3ng l\u1ebd ra ph\u1ea3i \u0111\u01b0\u1ee3c t\u1eadp trung v\u00e0o m\u1ed9t \u00f4 duy nh\u1ea5t nay l\u1ea1i ph\u00e2n t\u00e1n ra nhi\u1ec1u \u00f4. Do \u0111\u00f3, gi\u00e1 tr\u1ecb \u0111\u1ec9nh ch\u00ednh l\u00e0 <em>th\u1ea5p h\u01a1n<\/em> so v\u1edbi bi\u00ean \u0111\u1ed9 th\u1ef1c c\u1ee7a n\u00f3, trong khi c\u00e1c \u00f4 \u201csidelobe\u201d li\u1ec1n k\u1ec1 \u0111\u01b0\u1ee3c n\u00e2ng l\u00ean m\u1ed9t c\u00e1ch nh\u00e2n t\u1ea1o. M\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/amplitude\/\">bi\u00ean \u0111\u1ed9<\/a> Vi\u1ec7c ch\u1ec9 d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 \u0111o t\u1eeb \u0111\u1ec9nh r\u00f2 r\u1ec9 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn \u0111\u00e1nh gi\u00e1 sai m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng.<\/li>\n<li><strong>\u0110\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 gi\u1ea3m:<\/strong> S\u1ef1 r\u00f2 r\u1ec9 c\u00f3 th\u1ec3 nghi\u00eam tr\u1ecdng \u0111\u1ebfn m\u1ee9c che l\u1ea5p ho\u00e0n to\u00e0n c\u00e1c \u0111\u1ec9nh nh\u1ecf h\u01a1n \u1edf g\u1ea7n \u0111\u00f3. M\u1ed9t t\u00edn hi\u1ec7u y\u1ebfu t\u1eeb giai \u0111o\u1ea1n \u0111\u1ea7u <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/bearing-defects\/\">l\u1ed7i \u1ed5 tr\u1ee5c<\/a>, v\u00ed d\u1ee5, c\u00f3 th\u1ec3 b\u1ecb m\u1ea5t ho\u00e0n to\u00e0n trong v\u00f9ng r\u00f2 r\u1ec9 r\u1ed9ng t\u1eeb m\u1ed9t thi\u1ebft b\u1ecb l\u1edbn 1\u00d7 <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/unbalance\/\">m\u1ea5t c\u00e2n b\u1eb1ng<\/a> \u0111\u1ec9nh.<\/li>\n<\/ol>\n<p>C\u1ea3 hai y\u1ebfu t\u1ed1 n\u00e0y \u0111\u1ec1u \u0111i ng\u01b0\u1ee3c l\u1ea1i tr\u1ef1c ti\u1ebfp v\u1edbi m\u1ee5c ti\u00eau c\u1ee7a nh\u00e0 ph\u00e2n t\u00edch: x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c bi\u00ean \u0111\u1ed9 \u0111\u1ec3 ph\u00e2n t\u00edch xu h\u01b0\u1edbng v\u00e0 m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng, c\u0169ng nh\u01b0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i r\u00f5 r\u00e0ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 s\u1edbm.<\/p>\n<h2>4. Gi\u1ea3i ph\u00e1p: Ph\u00e2n v\u00f9ng<\/h2>\n<p>Hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 ph\u1ed5 \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t b\u1eb1ng <strong><a href=\"https:\/\/vibromera.eu\/vi\/glossary\/windowing\/\">c\u1eeda s\u1ed5<\/a><\/strong> h\u00e0m. M\u1ed9t c\u1eeda s\u1ed5 l\u00e0 m\u1ed9t h\u00e0m tr\u1ecdng s\u1ed1 to\u00e1n h\u1ecdc \u0111\u01b0\u1ee3c nh\u00e2n v\u1edbi d\u1eef li\u1ec7u d\u1ea1ng s\u00f3ng theo th\u1eddi gian <em>tr\u01b0\u1edbc<\/em> n\u00f3 \u0111\u01b0\u1ee3c truy\u1ec1n v\u00e0o h\u00e0m FFT.<\/p>\n<p>L\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn nh\u1ea5t cho c\u00e1c c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn m\u00e1y m\u00f3c quay n\u00f3i chung l\u00e0 <strong><a href=\"https:\/\/vibromera.eu\/vi\/glossary\/hanning-window\/\">C\u1eeda s\u1ed5 Hanning<\/a><\/strong>. N\u00f3 c\u00f3 d\u1ea1ng \u0111\u01b0\u1eddng cong m\u01b0\u1ee3t m\u00e0, h\u00ecnh chu\u00f4ng, l\u00e0m gi\u1ea3m d\u1ea7n c\u01b0\u1eddng \u0111\u1ed9 t\u00edn hi\u1ec7u xu\u1ed1ng m\u1ee9c 0 \u1edf c\u1ea3 \u0111\u1ea7u v\u00e0 cu\u1ed1i kh\u1ed1i. S\u1ef1 gi\u1ea3m d\u1ea7n n\u00e0y bu\u1ed9c hai \u0111\u1ea7u t\u00edn hi\u1ec7u ph\u1ea3i kh\u1edbp v\u1edbi nhau, t\u1eeb \u0111\u00f3 lo\u1ea1i b\u1ecf hi\u1ec7u qu\u1ea3 s\u1ef1 gi\u00e1n \u0111o\u1ea1n nh\u00e2n t\u1ea1o v\u1ed1n l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9. B\u1eb1ng c\u00e1ch cung c\u1ea5p cho ph\u00e9p bi\u1ebfn \u0111\u1ed5i Fourier nhanh (FFT) m\u1ed9t t\u00edn hi\u1ec7u tu\u1ea7n ho\u00e0n m\u01b0\u1ee3t m\u00e0, vi\u1ec7c \u00e1p d\u1ee5ng h\u00e0m c\u1eeda s\u1ed5 gi\u00fap gi\u1ea3m \u0111\u00e1ng k\u1ec3 hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 \u2014 mang l\u1ea1i c\u00e1c \u0111\u1ec9nh s\u1eafc n\u00e9t h\u01a1n, m\u1ee9c nhi\u1ec5u n\u1ec1n th\u1ea5p h\u01a1n v\u00e0 ph\u00e2n t\u00edch nh\u1ea1y c\u1ea3m h\u01a1n.<\/p>\n<p>Ph\u01b0\u01a1ng ph\u00e1p c\u1eeda s\u1ed5 l\u00e0 m\u1ed9t s\u1ef1 c\u00e2n b\u1eb1ng thay v\u00ec m\u1ed9t gi\u1ea3i ph\u00e1p tri\u1ec7t \u0111\u1ec3. Ch\u00ednh qu\u00e1 tr\u00ecnh l\u00e0m m\u1ecfng t\u00edn hi\u1ec7u gi\u00fap gi\u1ea3m thi\u1ec3u hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 c\u0169ng \u0111\u1ed3ng th\u1eddi l\u00e0m m\u1edf r\u1ed9ng nh\u1eb9 \u0111\u1ec9nh ch\u00ednh v\u00e0 l\u00e0m gi\u1ea3m bi\u00ean \u0111\u1ed9 \u0111o \u0111\u01b0\u1ee3c c\u1ee7a n\u00f3; \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao c\u00e1c thi\u1ebft b\u1ecb \u0111o l\u01b0\u1eddng \u00e1p d\u1ee5ng h\u1ec7 s\u1ed1 hi\u1ec7u ch\u1ec9nh bi\u00ean \u0111\u1ed9. C\u00e1c lo\u1ea1i c\u1eeda s\u1ed5 kh\u00e1c nhau s\u1ebd c\u00e2n b\u1eb1ng c\u00e1c \u0111\u1eb7c t\u00ednh n\u00e0y theo nh\u1eefng c\u00e1ch kh\u00e1c nhau: c\u1eeda s\u1ed5 d\u1ea1ng \u0111\u1ec9nh ph\u1eb3ng (flat-top) th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean khi c\u1ea7n \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a bi\u00ean \u0111\u1ed9 m\u1ed9t t\u1ea7n s\u1ed1 \u0111\u01a1n l\u1ebb (v\u00ed d\u1ee5 nh\u01b0 trong qu\u00e1 tr\u00ecnh <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/calibration\/\">s\u1ef1 \u0111\u1ecbnh c\u1ee1<\/a>), m\u1ed9t c\u1eeda s\u1ed5 \u0111\u1ed3ng nh\u1ea5t (h\u00ecnh ch\u1eef nh\u1eadt) ph\u00f9 h\u1ee3p \u0111\u1ec3 ghi l\u1ea1i c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng tho\u00e1ng qua trong m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/bump-test\/\">ki\u1ec3m tra va ch\u1ea1m<\/a>, trong khi Hanning v\u1eabn l\u00e0 l\u1ef1a ch\u1ecdn m\u1eb7c \u0111\u1ecbnh h\u00e0ng ng\u00e0y.<\/p>\n<h2>5. T\u1ea1i sao \u0111i\u1ec1u n\u00e0y l\u1ea1i quan tr\u1ecdng trong th\u1ef1c ti\u1ec5n<\/h2>\n<p>\u0110\u1ed1i v\u1edbi k\u1ef9 s\u01b0 hi\u1ec7n tr\u01b0\u1eddng, b\u00e0i h\u1ecdc r\u1ea5t \u0111\u01a1n gi\u1ea3n: ph\u1ed5 t\u00edn hi\u1ec7u s\u1ea1ch l\u00e0 \u0111i\u1ec1u ki\u1ec7n ti\u00ean quy\u1ebft \u0111\u1ec3 ch\u1ea9n \u0111o\u00e1n ch\u00ednh x\u00e1c. Hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 che l\u1ea5p ti\u1ebfng \u1ed3n nh\u1ecf t\u1eeb \u1ed5 tr\u1ee5c ho\u1eb7c l\u00e0m gi\u1ea3m bi\u00ean \u0111\u1ed9 c\u1ee7a \u0111\u1ec9nh t\u00edn hi\u1ec7u, t\u1eeb \u0111\u00f3 d\u1eabn \u0111\u1ebfn vi\u1ec7c \u0111i\u1ec1u tra \u0111i sai h\u01b0\u1edbng. Khi \u0111o bi\u00ean \u0111\u1ed9 1\u00d7 v\u00e0 <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/phase\/\">pha<\/a> \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c c\u00e2n ch\u1ec9nh \u2014 c\u00f4ng vi\u1ec7c th\u01b0\u1eddng xuy\u00ean m\u00e0 m\u1ed9t thi\u1ebft b\u1ecb c\u1ea7m tay nh\u01b0 <a href=\"https:\/\/vibromera.eu\/vi\/san-pham\/balanset-1\/\">Balanset-1A<\/a> x\u1ea3y ra ngay t\u1ea1i c\u00e1c \u1ed5 tr\u1ee5c c\u1ee7a m\u00e1y \u2014 vi\u1ec7c chia c\u1eeda s\u1ed5 ph\u00f9 h\u1ee3p gi\u00fap \u0111\u1ec9nh \u0111\u1ed3ng b\u1ed9 n\u00e0y lu\u00f4n r\u00f5 n\u00e9t v\u00e0 bi\u00ean \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh, do \u0111\u00f3, gi\u00e1 tr\u1ecb hi\u1ec7u ch\u1ec9nh \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u1ef1a tr\u00ean dao \u0111\u1ed9ng th\u1ef1c t\u1ebf ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng nhi\u1ec5u b\u1ecb m\u1edd nh\u00f2e.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/vi\/glossary\/\">\u2190 Quay l\u1ea1i M\u1ee5c l\u1ee5c ch\u00ednh<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u v\u1ec1 r\u00f2 r\u1ec9 ph\u1ed5, l\u1ed7i trong ph\u00e2n t\u00edch FFT do s\u1ef1 gi\u00e1n \u0111o\u1ea1n trong t\u00edn hi\u1ec7u th\u1eddi gian v\u00e0 c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c h\u00e0m t\u1ea1o c\u1eeda s\u1ed5 nh\u01b0 Hanning \u0111\u1ec3 ng\u0103n ch\u1eb7n l\u1ed7i n\u00e0y.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-247","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/247\/revisions"}],"predecessor-version":[{"id":101206,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/247\/revisions\/101206"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/media?parent=247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/categories?post=247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/tags?post=247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}