{"id":311,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/windowing\/"},"modified":"2026-05-23T22:40:35","modified_gmt":"2026-05-23T22:40:35","slug":"windowing","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/vi\/glossary\/windowing\/","title":{"rendered":"Windowing trong ph\u00e2n t\u00edch FFT l\u00e0 g\u00ec?"},"content":{"rendered":"<h1>Hi\u1ec3u v\u1ec1 Windowing trong Ph\u00e2n t\u00edch FFT<\/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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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\/311?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>C\u1eeda s\u1ed5<\/strong> l\u00e0 m\u1ed9t b\u01b0\u1edbc x\u1eed l\u00fd t\u00edn hi\u1ec7u trong \u0111\u00f3 m\u1ed9t h\u00e0m tr\u1ecdng s\u1ed1 to\u00e1n h\u1ecdc \u2014 m\u1ed9t \u201cc\u1eeda s\u1ed5\u201d \u2014 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho m\u1ed9t kh\u1ed1i <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/time-waveform\/\">d\u1ea1ng s\u00f3ng theo th\u1eddi gian<\/a> d\u1eef li\u1ec7u tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o ph\u00e9p bi\u1ebfn \u0111\u1ed5i Fourier nhanh (FFT). H\u00ecnh d\u1ea1ng c\u1ee7a c\u1eeda s\u1ed5 l\u00e0m gi\u1ea3m d\u1ea7n bi\u00ean \u0111\u1ed9 c\u1ee7a t\u00edn hi\u1ec7u thu \u0111\u01b0\u1ee3c xu\u1ed1ng m\u1ee9c 0 m\u1ed9t c\u00e1ch m\u01b0\u1ee3t m\u00e0 \u1edf \u0111\u1ea7u v\u00e0 cu\u1ed1i kh\u1ed1i th\u1eddi gian, nh\u1edd \u0111\u00f3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c gh\u00e9p n\u1ed1i v\u1edbi nhau m\u00e0 kh\u00f4ng c\u00f3 nh\u1eefng b\u01b0\u1edbc nh\u1ea3y \u0111\u1ed9t ng\u1ed9t. Ch\u00ednh thao t\u00e1c duy nh\u1ea5t n\u00e0y l\u00e0 y\u1ebfu t\u1ed1 gi\u00fap lo\u1ea1i b\u1ecf m\u1ed9t l\u1ed7i ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectral-leakage\/\">r\u00f2 r\u1ec9 ph\u1ed5<\/a> v\u00e0 do \u0111\u00f3 l\u00e0 y\u1ebfu t\u1ed1 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ec3 t\u1ea1o ra m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/spectrum\/\">ph\u1ed5 rung \u0111\u1ed9ng<\/a>. Tr\u00ean th\u1ef1c t\u1ebf <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/vibration-analysis\/\">Ph\u00e2n t\u00edch rung \u0111\u1ed9ng<\/a>, vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 \u00e1p d\u1ee5ng b\u1ed9 l\u1ecdc m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c ch\u00ednh l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh gi\u1eefa m\u1ed9t quang ph\u1ed5 r\u00f5 n\u00e9t, \u0111\u00e1ng tin c\u1eady v\u00e0 m\u1ed9t quang ph\u1ed5 b\u1ecb nh\u00f2e, g\u00e2y hi\u1ec3u l\u1ea7m.<\/p>\n<h2>1. \u0110\u1ecbnh ngh\u0129a: H\u00e0m c\u1eeda s\u1ed5 l\u00e0 g\u00ec?<\/h2>\n<p>H\u00e0m c\u1eeda s\u1ed5 l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng cong \u2014 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c h\u1ec7 s\u1ed1 nh\u00e2n, m\u1ed7i m\u1eabu m\u1ed9t h\u1ec7 s\u1ed1 \u2014 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng l\u00ean kh\u1ed1i th\u1eddi gian th\u00f4. \u1ede nh\u1eefng \u0111i\u1ec3m m\u00e0 gi\u00e1 tr\u1ecb c\u1eeda s\u1ed5 b\u1eb1ng 1.0, m\u1eabu d\u1eef li\u1ec7u \u0111i qua m\u00e0 kh\u00f4ng b\u1ecb thay \u0111\u1ed5i; \u1edf nh\u1eefng \u0111i\u1ec3m gi\u00e1 tr\u1ecb n\u00e0y gi\u1ea3m xu\u1ed1ng g\u1ea7n 0.0, m\u1eabu d\u1eef li\u1ec7u s\u1ebd b\u1ecb suy gi\u1ea3m. Do h\u1ea7u h\u1ebft c\u00e1c h\u00e0m c\u1eeda s\u1ed5 \u0111\u1ec1u \u0111\u1ea1t \u0111\u1ec9nh \u1edf gi\u1eefa v\u00e0 gi\u1ea3m d\u1ea7n \u1edf c\u1ea3 hai \u0111\u1ea7u, vi\u1ec7c nh\u00e2n b\u1ea3n ghi th\u1eddi gian v\u1edbi h\u00e0m c\u1eeda s\u1ed5 s\u1ebd bu\u1ed9c \u0111o\u1ea1n d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp ph\u1ea3i b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac \u1edf bi\u00ean \u0111\u1ed9 b\u1eb1ng kh\u00f4ng. C\u01a1 s\u1edf to\u00e1n h\u1ecdc c\u1ee7a <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/fft\/\">FFT<\/a> kh\u00f4ng thay \u0111\u1ed5i; vi\u1ec7c chia c\u1eeda s\u1ed5 ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 \u0111i\u1ec1u ki\u1ec7n h\u00f3a d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c gi\u1ea3 \u0111\u1ecbnh c\u00f3 s\u1eb5n c\u1ee7a ph\u00e9p bi\u1ebfn \u0111\u1ed5i. N\u1ebfu kh\u00f4ng c\u00f3 b\u01b0\u1edbc n\u00e0y, ph\u1ed5 m\u00e0 m\u00e1y ph\u00e2n t\u00edch tr\u1ea3 v\u1ec1 c\u00f3 th\u1ec3 sai v\u1ec1 m\u1eb7t \u0111\u1ecbnh l\u01b0\u1ee3ng ngay c\u1ea3 khi c\u1ea3m bi\u1ebfn v\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a chu\u1ed7i \u0111o l\u01b0\u1eddng \u0111\u1ec1u ho\u1ea1t \u0111\u1ed9ng ho\u00e0n h\u1ea3o.<\/p>\n<h2>2. V\u1ea5n \u0111\u1ec1: R\u00f2 r\u1ec9 ph\u1ed5<\/h2>\n<p>Ph\u01b0\u01a1ng ph\u00e1p FFT mang trong m\u00ecnh m\u1ed9t gi\u1ea3 \u0111\u1ecbnh c\u01a1 b\u1ea3n: n\u00f3 coi kh\u1ed1i d\u1eef li\u1ec7u th\u1eddi gian h\u1eefu h\u1ea1n m\u00e0 n\u00f3 ph\u00e2n t\u00edch nh\u01b0 l\u00e0 <em>m\u1ed9t chu k\u1ef3 ho\u00e0n ch\u1ec9nh c\u1ee7a m\u1ed9t t\u00edn hi\u1ec7u tu\u1ea7n ho\u00e0n ho\u00e0n h\u1ea3o, l\u1eb7p l\u1ea1i v\u00f4 t\u1eadn<\/em>. C\u00e1c t\u00edn hi\u1ec7u t\u1eeb m\u00e1y m\u00f3c th\u1ef1c t\u1ebf h\u1ea7u nh\u01b0 kh\u00f4ng bao gi\u1edd tu\u00e2n theo quy lu\u1eadt n\u00e0y. Khi qu\u00e1 tr\u00ecnh thu th\u1eadp d\u1eef li\u1ec7u b\u1eaft \u0111\u1ea7u v\u00e0 d\u1eebng l\u1ea1i v\u00e0o nh\u1eefng th\u1eddi \u0111i\u1ec3m ng\u1eabu nhi\u00ean, ph\u1ea7n cu\u1ed1i c\u1ee7a kh\u1ed1i d\u1eef li\u1ec7u thu \u0111\u01b0\u1ee3c s\u1ebd kh\u00f4ng kh\u1edbp v\u1edbi ph\u1ea7n \u0111\u1ea7u c\u1ee7a n\u00f3; do \u0111\u00f3, khi FFT th\u1ef1c hi\u1ec7n ph\u00e9p g\u1ea5p l\u1ea1i kh\u1ed1i d\u1eef li\u1ec7u, n\u00f3 s\u1ebd ph\u00e1t hi\u1ec7n ra nh\u1eefng \u0111i\u1ec3m gi\u00e1n \u0111o\u1ea1n \u0111\u1ed9t ng\u1ed9t v\u00e0 nh\u00e2n t\u1ea1o t\u1ea1i c\u00e1c ranh gi\u1edbi.<\/p>\n<p>H\u00e0m bi\u1ebfn \u0111\u1ed5i n\u00e0y coi nh\u1eefng b\u01b0\u1edbc nh\u1ea3y \u0111\u1ed9t ng\u1ed9t \u0111\u00f3 l\u00e0 th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao th\u1ef1c s\u1ef1 m\u00e0 m\u00e1y m\u00f3c kh\u00f4ng c\u00f3. N\u0103ng l\u01b0\u1ee3ng th\u1ef1c s\u1ef1 thu\u1ed9c v\u1ec1 m\u1ed9t t\u1ea7n s\u1ed1 ri\u00eang l\u1ebb, r\u1eddi r\u1ea1c <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/frequency\/\">T\u00ednh th\u01b0\u1eddng xuy\u00ean<\/a> \u0111\u1ec9nh b\u1ecb lan r\u1ed9ng \u2014 n\u00f3 \u201cr\u00f2 r\u1ec9\u201d \u2014 sang c\u00e1c \u00f4 t\u1ea7n s\u1ed1 li\u1ec1n k\u1ec1 \u1edf hai b\u00ean. H\u1eadu qu\u1ea3 c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u00f3 ba m\u1eb7t:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 ch\u00ednh x\u00e1c bi\u00ean \u0111\u1ed9 gi\u1ea3m:<\/strong> Chi\u1ec1u cao \u0111o \u0111\u01b0\u1ee3c c\u1ee7a \u0111\u1ec9nh th\u1ea5p h\u01a1n gi\u00e1 tr\u1ecb th\u1ef1c c\u1ee7a n\u00f3 v\u00ec n\u0103ng l\u01b0\u1ee3ng c\u1ee7a \u0111\u1ec9nh \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n ra nhi\u1ec1u \u00f4 thay v\u00ec t\u1eadp trung v\u00e0o m\u1ed9t \u00f4 duy nh\u1ea5t.<\/li>\n<li><strong>C\u00e1c \u0111\u1ec9nh m\u1edf r\u1ed9ng:<\/strong> \u0111\u01b0\u1eddng cong tr\u00f4ng r\u1ed9ng h\u01a1n v\u00e0 kh\u00f4ng r\u00f5 n\u00e9t nh\u01b0 nh\u1eefng g\u00ec l\u00fd thuy\u1ebft v\u1eadt l\u00fd c\u01a1 b\u1ea3n cho ph\u00e9p, khi\u1ebfn \u01b0\u1edbc l\u01b0\u1ee3ng t\u1ea7n s\u1ed1 tr\u1edf n\u00ean m\u1edd nh\u1ea1t.<\/li>\n<li><strong>M\u1ea5t \u0111\u1ed9 ph\u00e2n gi\u1ea3i:<\/strong> N\u0103ng l\u01b0\u1ee3ng tr\u00e0n ra l\u00e0m t\u0103ng m\u1ee9c nhi\u1ec5u n\u1ec1n xung quanh m\u1ed9t \u0111\u1ec9nh l\u1edbn, che l\u1ea5p c\u00e1c \u0111\u1ec9nh nh\u1ecf h\u01a1n li\u1ec1n k\u1ec1 \u2014 ch\u00ednh x\u00e1c l\u00e0 nh\u1eefng \u0111\u1ec9nh nh\u1ecf <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/harmonics\/\">s\u00f3ng h\u00e0i<\/a> v\u00e0 c\u00e1c d\u1ea3i t\u1ea7n ph\u1ee5 th\u01b0\u1eddng ch\u1ee9a th\u00f4ng tin ch\u1ea9n \u0111o\u00e1n.<\/li>\n<\/ul>\n<h2>3. Gi\u1ea3i ph\u00e1p: L\u1eafp \u0111\u1eb7t c\u1eeda s\u1ed5<\/h2>\n<p>Ph\u01b0\u01a1ng ph\u00e1p chia c\u1eeda s\u1ed5 kh\u1eafc ph\u1ee5c hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 b\u1eb1ng c\u00e1ch bu\u1ed9c t\u00edn hi\u1ec7u ph\u1ea3i <em>nh\u00ecn<\/em> theo chu k\u1ef3 trong kh\u1ed1i. Vi\u1ec7c nh\u00e2n d\u1ea1ng s\u00f3ng th\u00f4 v\u1edbi h\u00e0m c\u1eeda s\u1ed5 s\u1ebd l\u00e0m gi\u1ea3m d\u1ea7n bi\u00ean \u0111\u1ed9 \u1edf \u0111\u1ea7u v\u00e0 cu\u1ed1i c\u1ef1c tr\u1ecb xu\u1ed1ng 0, t\u1eeb \u0111\u00f3 lo\u1ea1i b\u1ecf c\u00e1c \u0111i\u1ec3m gi\u00e1n \u0111o\u1ea1n \u1edf ranh gi\u1edbi v\u00e0, tr\u00ean th\u1ef1c t\u1ebf, \u201c\u0111\u00e1nh l\u1eeba\u201d FFT \u0111\u1ec3 n\u00f3 nh\u1eadn di\u1ec7n t\u00edn hi\u1ec7u l\u00e0 li\u00ean t\u1ee5c, kh\u00f4ng c\u00f3 khe h\u1edf. K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c l\u00e0 ph\u1ed5 t\u1ea7n s\u1ed1 r\u00f5 r\u00e0ng h\u01a1n h\u1eb3n:<\/p>\n<ul>\n<li>\u0110\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 bi\u00ean \u0111\u1ed9 \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3, do \u0111\u00f3 c\u00f3 th\u1ec3 tin c\u1eady v\u00e0o \u0111\u1ed9 cao \u0111\u1ec9nh so v\u1edbi <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/vibration-severity\/\">m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a rung \u0111\u1ed9ng<\/a> gi\u1edbi h\u1ea1n.<\/li>\n<li>C\u00e1c \u0111\u1ec9nh t\u1ea7n s\u1ed1 r\u00f5 n\u00e9t v\u00e0 s\u1eafc n\u00e9t h\u01a1n, gi\u00fap x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c l\u1ed7i thu\u1ed9c v\u1ec1 m\u1ed9t b\u1eadc ho\u1eb7c th\u00e0nh ph\u1ea7n c\u1ee5 th\u1ec3.<\/li>\n<li>M\u1ee9c nhi\u1ec5u n\u1ec1n hi\u1ec7u d\u1ee5ng th\u1ea5p h\u01a1n, gi\u00fap c\u00e1c t\u00edn hi\u1ec7u nh\u1ecf n\u1ed5i b\u1eadt h\u01a1n so v\u1edbi c\u00e1c t\u00edn hi\u1ec7u l\u1edbn.<\/li>\n<\/ul>\n<p>\u0110i\u1ec1u n\u00e0y t\u1ea5t nhi\u00ean \u0111i k\u00e8m v\u1edbi m\u1ed9t s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i. Vi\u1ec7c thu h\u1eb9p hai \u0111\u1ea7u s\u1ebd l\u00e0m m\u1ea5t \u0111i m\u1ed9t ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng c\u1ee7a b\u1ea3n ghi v\u00e0 l\u00e0m m\u1edf r\u1ed9ng nh\u1eb9 v\u00f9ng ph\u1ed5 ch\u00ednh, do \u0111\u00f3 vi\u1ec7c \u00e1p d\u1ee5ng h\u00e0m c\u1eeda s\u1ed5 s\u1ebd \u0111\u00e1nh \u0111\u1ed5i m\u1ed9t ch\u00fat \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 \u0111\u1ec3 \u0111\u1ed5i l\u1ea5y vi\u1ec7c gi\u1ea3m \u0111\u00e1ng k\u1ec3 hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9. M\u1ed7i h\u00e0m c\u1eeda s\u1ed5 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111i\u1ec3m kh\u00e1c nhau tr\u00ean \u0111\u01b0\u1eddng cong \u0111\u00e1nh \u0111\u1ed5i \u0111\u00f3, v\u00e0 \u0111\u00f3 ch\u00ednh l\u00e0 l\u00fd do t\u1ea1i sao c\u00f3 nhi\u1ec1u d\u1ea1ng h\u00e0m c\u1eeda s\u1ed5 kh\u00e1c nhau.<\/p>\n<h2>4. C\u00e1c lo\u1ea1i c\u1eeda s\u1ed5 ph\u1ed5 bi\u1ebfn<\/h2>\n<p>H\u00e0ng ch\u1ee5c h\u00e0m chia th\u1eddi gian \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n, m\u1ed7i h\u00e0m l\u1ea1i c\u00f3 c\u00e1ch t\u00ednh tr\u1ecdng s\u1ed1 cho c\u00e1c kho\u1ea3ng th\u1eddi gian h\u01a1i kh\u00e1c nhau. \u0110\u1ed1i v\u1edbi c\u00e1c c\u00f4ng vi\u1ec7c gia c\u00f4ng c\u01a1 kh\u00ed th\u00f4ng th\u01b0\u1eddng, c\u00f3 m\u1ed9t h\u00e0m chi\u1ebfm \u01b0u th\u1ebf.<\/p>\n<h3>C\u1eeda s\u1ed5 Hanning<\/h3>\n<p>The <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/hanning-window\/\">C\u1eeda s\u1ed5 Hanning<\/a> (h\u00e0m gi\u1ea3m d\u1ea7n cosin n\u00e2ng cao) mang l\u1ea1i s\u1ef1 c\u00e2n b\u1eb1ng tuy\u1ec7t v\u1eddi gi\u1eefa \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c bi\u00ean \u0111\u1ed9, v\u00e0 \u0111\u00e2y l\u00e0 c\u00e0i \u0111\u1eb7t m\u1eb7c \u0111\u1ecbnh \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho h\u1ea7u h\u1ebft c\u00e1c ph\u00e9p \u0111o rung \u0111\u1ed9ng c\u1ee7a m\u00e1y m\u00f3c quay ti\u00eau chu\u1ea9n. Tr\u1eeb khi c\u00f3 l\u00fd do c\u1ee5 th\u1ec3 \u0111\u1ec3 l\u00e0m kh\u00e1c \u0111i, c\u1eeda s\u1ed5 Hanning lu\u00f4n n\u00ean \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn. \u0110\u00e2y l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p cho c\u00e1c t\u00edn hi\u1ec7u li\u00ean t\u1ee5c, c\u00f3 t\u00ednh chu k\u1ef3 r\u1ed9ng, v\u1ed1n chi\u1ebfm \u01b0u th\u1ebf <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/condition-monitoring\/\">gi\u00e1m s\u00e1t t\u00ecnh tr\u1ea1ng<\/a>.<\/p>\n<h3>C\u00e1c c\u1eeda s\u1ed5 kh\u00e1c<\/h3>\n<ul>\n<li><strong>C\u1eeda s\u1ed5 h\u00ecnh ch\u1eef nh\u1eadt (c\u00f2n g\u1ecdi l\u00e0 Uniform ho\u1eb7c \u201cNone\u201d):<\/strong> t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi vi\u1ec7c kh\u00f4ng \u00e1p d\u1ee5ng b\u1ea5t k\u1ef3 h\u00e0m c\u1eeda s\u1ed5 n\u00e0o. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 cao nh\u1ea5t nh\u01b0ng hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 ph\u1ed5 l\u1ea1i nghi\u00eam tr\u1ecdng nh\u1ea5t, v\u00e0 ch\u1ec9 ph\u00f9 h\u1ee3p khi bi\u1ebft ch\u1eafc r\u1eb1ng t\u00edn hi\u1ec7u c\u00f3 t\u00ednh tu\u1ea7n ho\u00e0n ho\u00e0n h\u1ea3o trong ph\u1ea1m vi kh\u1ed1i \u2014 ho\u1eb7c khi ghi l\u1ea1i c\u00e1c s\u1ef1 ki\u1ec7n tho\u00e1ng qua r\u1ea5t s\u1eafc n\u00e9t v\u00e0 ho\u00e0n to\u00e0n kh\u00e9p k\u00edn, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ed9t c\u00fa va ch\u1ea1m.<\/li>\n<li><strong>C\u1eeda s\u1ed5 m\u00e1i b\u1eb1ng:<\/strong> cung c\u1ea5p \u0111\u1ed9 ch\u00ednh x\u00e1c cao nh\u1ea5t v\u1ec1 bi\u00ean \u0111\u1ed9 so v\u1edbi b\u1ea5t k\u1ef3 h\u00e0m c\u1eeda s\u1ed5 th\u00f4ng d\u1ee5ng n\u00e0o, nh\u01b0ng \u0111\u1ed5i l\u1ea1i l\u00e0 \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 r\u1ea5t k\u00e9m (c\u00e1c \u0111\u1ec9nh r\u1ea5t r\u1ed9ng). \u0110\u00e2y l\u00e0 h\u00e0m c\u1eeda s\u1ed5 \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng nh\u1ea5t trong c\u00f4ng t\u00e1c hi\u1ec7u chu\u1ea9n v\u00e0 b\u1ea5t k\u1ef3 t\u00e1c v\u1ee5 n\u00e0o y\u00eau c\u1ea7u \u0111\u1ed9 ch\u00ednh x\u00e1c <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/amplitude\/\">bi\u00ean \u0111\u1ed9<\/a> \u0110\u1ed9 l\u1ec7ch c\u1ee7a \u0111\u1ec9nh quan tr\u1ecdng h\u01a1n t\u1ea7n s\u1ed1 ch\u00ednh x\u00e1c c\u1ee7a n\u00f3 \u2014 v\u00ed d\u1ee5 nh\u01b0 vi\u1ec7c so s\u00e1nh c\u1ea3m bi\u1ebfn v\u1edbi m\u1ed9t <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/calibration-certificate\/\">Gi\u1ea5y ch\u1ee9ng nh\u1eadn hi\u1ec7u chu\u1ea9n<\/a> tr\u00ean m\u1ed9t thi\u1ebft b\u1ecb rung chu\u1ea9n \u0111\u00e3 bi\u1ebft.<\/li>\n<li><strong>C\u1eeda s\u1ed5 Hamming:<\/strong> c\u00f3 m\u1ed1i li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd v\u1edbi h\u00e0m Hanning, v\u1edbi m\u1ed9t s\u1ed1 nh\u01b0\u1ee3c \u0111i\u1ec3m nh\u1ecf v\u1ec1 \u0111\u1eb7c t\u00ednh c\u1ee7a c\u00e1c \u0111\u1ec9nh ph\u1ee5; hi\u1ebfm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ch\u1ea9n \u0111o\u00e1n thi\u1ebft b\u1ecb c\u01a1 kh\u00ed th\u00f4ng th\u01b0\u1eddng.<\/li>\n<\/ul>\n<h2>5. Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng c\u1eeda s\u1ed5 \u2014 v\u00e0 c\u00e1ch n\u00f3 t\u01b0\u01a1ng t\u00e1c v\u1edbi \u0111\u1ed9 ph\u00e2n gi\u1ea3i<\/h2>\n<p>\u0110\u1ed1i v\u1edbi vi\u1ec7c gi\u00e1m s\u00e1t t\u00ecnh tr\u1ea1ng m\u00e1y m\u00f3c, nguy\u00ean t\u1eafc r\u1ea5t \u0111\u01a1n gi\u1ea3n: <strong>lu\u00f4n s\u1eed d\u1ee5ng c\u1eeda s\u1ed5 Hanning<\/strong> \u0111\u1ec3 ph\u00e2n t\u00edch ph\u1ed5 t\u1ed5ng qu\u00e1t. Vi\u1ec7c t\u1eaft c\u1eeda s\u1ed5 \u2014 ch\u1ecdn \u201cRectangular\u201d tr\u00ean m\u1ed9t t\u00edn hi\u1ec7u \u0111ang ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng \u2014 s\u1ebd d\u1eabn \u0111\u1ebfn d\u1eef li\u1ec7u kh\u00f4ng ch\u00ednh x\u00e1c v\u00e0 c\u00f3 th\u1ec3 g\u00e2y hi\u1ec3u l\u1ea7m, b\u1edfi v\u00ec hi\u1ec7n t\u01b0\u1ee3ng r\u00f2 r\u1ec9 s\u1ebd l\u00e0m bi\u1ebfn d\u1ea1ng c\u1ea3 \u0111\u1ed9 cao \u0111\u1ec9nh v\u00e0 m\u1ee9c nhi\u1ec5u n\u1ec1n bi\u1ec3u ki\u1ebfn. C\u00e1c thi\u1ebft b\u1ecb hi\u1ec7n \u0111\u1ea1i m\u1eb7c \u0111\u1ecbnh s\u1eed d\u1ee5ng c\u1eeda s\u1ed5 Hanning ch\u00ednh x\u00e1c v\u00ec n\u00f3 l\u00e0 y\u1ebfu t\u1ed1 thi\u1ebft y\u1ebfu \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c ph\u1ed5 \u0111\u00e1ng tin c\u1eady v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n<p>Vi\u1ec7c \u00e1p d\u1ee5ng h\u00e0m c\u1eeda s\u1ed5 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp. Do hi\u1ec7u \u1ee9ng thu h\u1eb9p l\u00e0m m\u1edf r\u1ed9ng t\u1eebng v\u1ea1ch ph\u1ed5, n\u00ean \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ea7n s\u1ed1 th\u1ef1c t\u1ebf m\u00e0 b\u1ea1n \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u00e0 k\u1ebft qu\u1ea3 t\u1ed5ng h\u1ee3p c\u1ee7a vi\u1ec7c l\u1ef1a ch\u1ecdn h\u00e0m c\u1eeda s\u1ed5 v\u00e0 c\u00e1c th\u00f4ng s\u1ed1 ph\u00e2n t\u00edch \u2014 \u0111\u1ed9 d\u00e0i kh\u1ed1i (s\u1ed1 m\u1eabu), t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu v\u00e0 d\u1ea3i t\u1ea7n. Khi c\u00e1c \u0111\u1ec9nh n\u1eb1m r\u1ea5t g\u1ea7n nhau, vi\u1ec7c k\u00e9o d\u00e0i kho\u1ea3ng th\u1eddi gian ghi d\u1eef li\u1ec7u s\u1ebd l\u00e0m ch\u00fang s\u1eafc n\u00e9t h\u01a1n so v\u1edbi vi\u1ec7c thay \u0111\u1ed5i h\u00e0m c\u1eeda s\u1ed5; b\u1ea1n c\u00f3 th\u1ec3 xem tr\u01b0\u1edbc s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i \u0111\u00f3 b\u1eb1ng c\u00e1ch <a href=\"https:\/\/vibromera.eu\/vi\/calculators\/fft-resolution-calculator\/\">C\u00f4ng c\u1ee5 t\u00ednh \u0111\u1ed9 ph\u00e2n gi\u1ea3i FFT<\/a> tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh s\u1eed d\u1ee5ng m\u1ed9t thi\u1ebft l\u1eadp \u0111o l\u01b0\u1eddng. Ph\u01b0\u01a1ng ph\u00e1p chia c\u1eeda s\u1ed5 c\u0169ng kh\u00e1c bi\u1ec7t v\u1edbi, \u0111\u1ed3ng th\u1eddi b\u1ed5 sung cho, <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/signal-filtering\/\">l\u1ecdc t\u00edn hi\u1ec7u<\/a>: B\u1ed9 l\u1ecdc lo\u1ea1i b\u1ecf c\u00e1c d\u1ea3i t\u1ea7n s\u1ed1 kh\u00f4ng mong mu\u1ed1n kh\u1ecfi t\u00edn hi\u1ec7u, trong khi h\u00e0m c\u1eeda s\u1ed5 \u0111i\u1ec1u ch\u1ec9nh c\u00e1c d\u1ea3i t\u1ea7n s\u1ed1 c\u00f2n l\u1ea1i \u0111\u1ec3 ph\u00e9p bi\u1ebfn \u0111\u1ed5i Fourier nhanh (FFT) c\u00f3 th\u1ec3 t\u00e1i hi\u1ec7n ch\u00fang m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n<h2>6. Ph\u00e2n v\u00f9ng trong th\u1ef1c t\u1ebf<\/h2>\n<p>Trong qu\u00e1 tr\u00ecnh ch\u1ea9n \u0111o\u00e1n th\u1ef1c t\u1ebf, c\u1eeda s\u1ed5 hi\u1ec3n th\u1ecb hi\u1ebfm khi l\u00e0 \u0111i\u1ec1u m\u00e0 chuy\u00ean vi\u00ean ph\u00e2n t\u00edch ngh\u0129 \u0111\u1ebfn m\u1ed9t c\u00e1ch c\u00f3 \u00fd th\u1ee9c \u2014 v\u00e0 \u0111\u00f3 l\u00e0 \u0111i\u1ec1u \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf s\u1eb5n. Khi m\u1ed9t k\u1ef9 s\u01b0 thu th\u1eadp ph\u1ed5 ho\u1eb7c th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c c\u00e2n b\u1eb1ng b\u1eb1ng m\u1ed9t thi\u1ebft b\u1ecb c\u1ea7m tay hai k\u00eanh nh\u01b0 <a href=\"https:\/\/vibromera.eu\/vi\/san-pham\/balanset-1\/\">Balanset-1A<\/a>, ph\u1ea7n m\u1ec1m s\u1ebd t\u1ef1 \u0111\u1ed9ng \u00e1p d\u1ee5ng c\u1eeda s\u1ed5 Hanning tr\u01b0\u1edbc khi t\u00ednh to\u00e1n FFT, do \u0111\u00f3 1\u00d7 <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/running-speed\/\">t\u1ed1c \u0111\u1ed9 ch\u1ea1y<\/a> \u0111\u1ec9nh v\u00e0 c\u00e1c s\u00f3ng h\u00e0i c\u1ee7a n\u00f3 xu\u1ea5t hi\u1ec7n v\u1edbi bi\u00ean \u0111\u1ed9 th\u1ef1c v\u00e0 t\u1ea7n s\u1ed1 ch\u00ednh x\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n b\u1ea5t k\u1ef3 b\u01b0\u1edbc x\u1eed l\u00fd b\u1ed5 sung n\u00e0o. Ch\u00ednh ph\u1ed5 \u0111\u00e3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng h\u00e0m c\u1eeda s\u1ed5 \u0111\u00fang c\u00e1ch n\u00e0y m\u1edbi cho ph\u00e9p c\u00f9ng m\u1ed9t thi\u1ebft b\u1ecb ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c m\u1ed9t t\u00edn hi\u1ec7u <a href=\"https:\/\/vibromera.eu\/vi\/glossary\/unbalance\/\">m\u1ea5t c\u00e2n b\u1eb1ng<\/a> lo\u1ea1i b\u1ecf c\u00e1c \u0111\u1ec9nh nhi\u1ec5u l\u00e2n c\u1eadn v\u00e0 ki\u1ec3m tra l\u1ea1i k\u1ebft qu\u1ea3 sau khi hi\u1ec7u ch\u1ec9nh. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng b\u00ean trong c\u1ee7a h\u00e0m c\u1eeda s\u1ed5 s\u1ebd gi\u00fap nh\u00e0 ph\u00e2n t\u00edch nh\u1eadn ra khi n\u00e0o vi\u1ec7c l\u1ef1a ch\u1ecdn c\u00e1c t\u00f9y ch\u1ecdn kh\u00f4ng m\u1eb7c \u0111\u1ecbnh \u2014 nh\u01b0 Flattop \u0111\u1ec3 ki\u1ec3m tra hi\u1ec7u chu\u1ea9n hay Rectangular cho t\u00edn hi\u1ec7u tho\u00e1ng qua s\u1ea1ch \u2014 th\u1ef1c s\u1ef1 l\u00e0 c\u1ea7n thi\u1ebft.<\/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>H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1c h\u00e0m c\u1eeda s\u1ed5 (nh\u01b0 Hanning) trong ph\u00e2n t\u00edch FFT. T\u00ecm hi\u1ec3u l\u00fd do t\u1ea1i sao vi\u1ec7c t\u1ea1o c\u1eeda s\u1ed5 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 gi\u1ea3m thi\u1ec3u r\u00f2 r\u1ec9 ph\u1ed5 v\u00e0 \u0111\u1ea3m b\u1ea3o c\u00e1c ph\u00e9p \u0111o rung \u0111\u1ed9ng ch\u00ednh x\u00e1c.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[114,109],"tags":[],"class_list":["post-311","glossary","type-glossary","status-publish","hentry","category-analysis","category-glossary"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/311","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\/311\/revisions"}],"predecessor-version":[{"id":101322,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/glossary\/311\/revisions\/101322"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/media?parent=311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/categories?post=311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/vi\/wp-json\/wp\/v2\/tags?post=311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}