{"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\/cs\/glossary\/windowing\/","title":{"rendered":"Co je to okenov\u00e1n\u00ed v FFT anal\u00fdze?"},"content":{"rendered":"<h1>Pou\u017eit\u00ed okenn\u00ed funkce v anal\u00fdze 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\/cs\/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\/cs\/product\/balanset-1\/\" title=\"P\u0159enosn\u00fd vyva\u017eova\u010d a analyz\u00e1tor vibrac\u00ed 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=\"Kompletn\u00ed sada p\u0159enosn\u00e9ho vyva\u017eova\u010de a analyz\u00e1toru vibrac\u00ed 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\/cs\/product-category\/devices\/\" rel=\"tag\">Za\u0159\u00edzen\u00ed<\/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\/cs\/product\/balanset-1\/\" title=\"P\u0159enosn\u00fd vyva\u017eova\u010d a analyz\u00e1tor vibrac\u00ed Balanset-1A\">P\u0159enosn\u00fd vyva\u017eova\u010d a analyz\u00e1tor vibrac\u00ed 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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/product\/vibration-sensor\/\" title=\"Sn\u00edma\u010d vibrac\u00ed\">\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=\"Sn\u00edma\u010d vibrac\u00ed Balanset-1A zbl\u00edzka\" 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\/cs\/product-category\/parts\/\" rel=\"tag\">D\u00edly<\/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\/cs\/product\/vibration-sensor\/\" title=\"Sn\u00edma\u010d vibrac\u00ed\">Sn\u00edma\u010d vibrac\u00ed<\/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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optick\u00fd senzor (laserov\u00fd ot\u00e1\u010dkom\u011br)\">\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=\"Optick\u00fd senzor (laserov\u00fd ot\u00e1\u010dkom\u011br)\" 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\/cs\/product-category\/parts\/\" rel=\"tag\">D\u00edly<\/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\/cs\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optick\u00fd senzor (laserov\u00fd ot\u00e1\u010dkom\u011br)\">Optick\u00fd senzor (laserov\u00fd ot\u00e1\u010dkom\u011br)<\/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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/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=\"Sada pro vyva\u017eov\u00e1n\u00ed rotor\u016f Vibromera: p\u0159epravn\u00ed kuf\u0159\u00edk, v\u00edcekan\u00e1lov\u00fd zesilova\u010d sign\u00e1lu, ru\u010dn\u00ed analyz\u00e1tor, magnetick\u00e1 z\u00e1kladna, vibra\u010dn\u00ed senzory a spir\u00e1lov\u00e9 kabely.\" 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\/cs\/product-category\/devices\/\" rel=\"tag\">Za\u0159\u00edzen\u00ed<\/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\/cs\/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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/product\/magnet-stand\/\" title=\"Magnetick\u00fd stojan 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=\"Magnetick\u00e1 z\u00e1kladna.\" 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\/cs\/product-category\/parts\/\" rel=\"tag\">D\u00edly<\/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\/cs\/product\/magnet-stand\/\" title=\"Magnetick\u00fd stojan Insize-60 kgf\">Magnetick\u00fd stojan 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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cMagnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201cMagnetic Stand Insize-60-kgf\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/product\/reflective-tape\/\" title=\"Reflexn\u00ed p\u00e1ska\">\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=\"Reflexn\u00ed p\u00e1ska\" 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\/cs\/product-category\/parts\/\" rel=\"tag\">D\u00edly<\/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\/cs\/product\/reflective-tape\/\" title=\"Reflexn\u00ed p\u00e1ska\">Reflexn\u00ed p\u00e1ska<\/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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cReflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201cReflective tape\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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\/cs\/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\/cs\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamick\u00fd vyva\u017eova\u010d &quot;Balanset-1A&quot; OEM\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2021\/11\/\u0411\u0430\u043b\u043a\u043e\u043c\u041a\u0438\u0442-scaled-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Obsah sady Balanset-1A s jednotkou rozhran\u00ed, senzory, ot\u00e1\u010dkom\u011brem a p\u0159\u00edslu\u0161enstv\u00edm\" 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\/cs\/product-category\/devices\/\" rel=\"tag\">Za\u0159\u00edzen\u00ed<\/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\/cs\/product\/dynamic-balancer-balanset-1a\/\" title=\"Dynamick\u00fd vyva\u017eova\u010d &quot;Balanset-1A&quot; OEM\">Dynamick\u00fd vyva\u017eova\u010d \"Balanset-1A\" 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> + DPH (pokud se uplat\u0148uje)<\/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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"P\u0159idat do ko\u0161\u00edku\" 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=\"\/cs\/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=\"P\u0159idat do ko\u0161\u00edku: \u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201cDynamic balancer \u201cBalanset-1A\u201d OEM\u201d byl p\u0159id\u00e1n do ko\u0161\u00edku\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">P\u0159idat do ko\u0161\u00edku<\/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>Oknov\u00e1n\u00ed<\/strong> je krok zpracov\u00e1n\u00ed sign\u00e1lu, p\u0159i kter\u00e9m se na blok dat aplikuje matematick\u00e1 v\u00e1hov\u00e1 funkce \u2014 &#8220;okno&#8221; \u2014 <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/time-waveform\/\">\u010dasov\u00fd pr\u016fb\u011bh<\/a> data p\u0159edt\u00edm, ne\u017e jsou p\u0159ed\u00e1na do rychl\u00e9 Fourierovy transformace. Tvar okna plynule sni\u017euje amplitudu zaznamenan\u00e9ho sign\u00e1lu a\u017e na nulu na za\u010d\u00e1tku a na konci \u010dasov\u00e9ho bloku, tak\u017ee se data spoj\u00ed bez n\u00e1hl\u00fdch skok\u016f. Pr\u00e1v\u011b tato jedin\u00e1 operace potla\u010duje \u010dastou chybu zvanou <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/spectral-leakage\/\">spektr\u00e1ln\u00ed \u00fanik<\/a> a je proto nezbytn\u00e9 pro vytvo\u0159en\u00ed p\u0159esn\u00e9ho <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/spectrum\/\">vibra\u010dn\u00ed spektrum<\/a>. V praxi <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/vibration-analysis\/\">anal\u00fdza vibrac\u00ed<\/a>Spr\u00e1vn\u00fd v\u00fdb\u011br a pou\u017eit\u00ed okenn\u00ed funkce rozhoduje o tom, zda bude spektrum \u010dist\u00e9 a spolehliv\u00e9, nebo rozmazan\u00e9 a zav\u00e1d\u011bj\u00edc\u00ed.<\/p>\n<h2>1. Definice: Co je to okenn\u00ed funkce?<\/h2>\n<p>Okenn\u00ed funkce je profil \u2013 soubor multiplika\u010dn\u00edch koeficient\u016f, jeden pro ka\u017ed\u00fd vzorek \u2013, kter\u00fd se aplikuje na surov\u00fd \u010dasov\u00fd blok. Tam, kde je hodnota okna 1,0, vzorek projde beze zm\u011bny; tam, kde se bl\u00ed\u017e\u00ed k 0,0, je vzorek zeslaben. Jeliko\u017e t\u00e9m\u011b\u0159 ka\u017ed\u00e9 okno dosahuje maxima uprost\u0159ed a na obou konc\u00edch se zu\u017euje, vyn\u00e1soben\u00ed \u010dasov\u00e9ho z\u00e1znamu touto funkc\u00ed zajist\u00ed, \u017ee zachycen\u00fd \u00fasek za\u010d\u00edn\u00e1 a kon\u010d\u00ed s nulovou amplitudou. Matematika t\u00e9to <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/fft\/\">Rychl\u00e1 Fourierova transformace (FFT)<\/a> z\u016fst\u00e1vaj\u00ed nezm\u011bn\u011bny; pou\u017eit\u00ed okenn\u00ed funkce pouze upravuje vstupn\u00ed data tak, aby byly spln\u011bny vestav\u011bn\u00e9 p\u0159edpoklady transformace. Bez n\u011bj m\u016f\u017ee b\u00fdt spektrum, kter\u00e9 analyz\u00e1tor vygeneruje, kvantitativn\u011b nespr\u00e1vn\u00e9, i kdy\u017e jsou senzor a zbytek m\u011b\u0159ic\u00edho \u0159et\u011bzce bezchybn\u00e9.<\/p>\n<h2>2. Probl\u00e9m: spektr\u00e1ln\u00ed \u00fanik<\/h2>\n<p>FFT vych\u00e1z\u00ed z n\u00e1sleduj\u00edc\u00edho p\u0159edpokladu: analyzovan\u00fd kone\u010dn\u00fd blok \u010dasov\u00fdch dat pova\u017euje za <em>jeden cel\u00fd cyklus dokonale periodick\u00e9ho sign\u00e1lu, kter\u00fd se opakuje donekone\u010dna<\/em>. Sign\u00e1ly z re\u00e1ln\u00fdch stroj\u016f se t\u00e9m\u011b\u0159 nikdy nechovaj\u00ed podle o\u010dek\u00e1v\u00e1n\u00ed. Kdy\u017e se sb\u011br dat spou\u0161t\u00ed a zastavuje v libovoln\u00fdch okam\u017eic\u00edch, konec zaznamenan\u00e9ho bloku nesed\u00ed s jeho za\u010d\u00e1tkem, tak\u017ee kdy\u017e FFT tento blok v ment\u00e1ln\u00edm smyslu \u201ezavine\u201c zp\u011bt na sebe, zaznamen\u00e1 na hranic\u00edch ostr\u00e9, um\u011bl\u00e9 nespojitosti.<\/p>\n<p>Tato transformace interpretuje tyto n\u00e1hl\u00e9 skoky jako skute\u010dn\u00fd vysokofrekven\u010dn\u00ed obsah, kter\u00fd ve stroji neexistuje. Energie, kter\u00e1 skute\u010dn\u011b pat\u0159\u00ed k jedin\u00e9mu, diskr\u00e9tn\u00edmu <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/frequency\/\">frekvence<\/a> \u0161pi\u010dka se rozpl\u00fdv\u00e1 \u2013 &#8220;p\u0159esahuje&#8221; \u2013 do sousedn\u00edch frekven\u010dn\u00edch p\u00e1sem na obou stran\u00e1ch. To m\u00e1 t\u0159i d\u016fsledky:<\/p>\n<ul>\n<li><strong>Sn\u00ed\u017een\u00e1 p\u0159esnost amplitudy:<\/strong> nam\u011b\u0159en\u00e1 v\u00fd\u0161ka vrcholu je ni\u017e\u0161\u00ed ne\u017e jeho skute\u010dn\u00e1 hodnota, proto\u017ee jeho energie se rozlo\u017eila do mnoha bin\u016f, m\u00edsto aby se soust\u0159edila do jednoho.<\/li>\n<li><strong>Roz\u0161\u00ed\u0159en\u00e9 vrcholy:<\/strong> \u010d\u00e1ra se jev\u00ed \u0161ir\u0161\u00ed a m\u00e9n\u011b ost\u0159e ohrani\u010den\u00e1, ne\u017e by odpov\u00eddalo fyzik\u00e1ln\u00edm z\u00e1konitostem, co\u017e vede k nep\u0159esn\u00e9mu odhadu frekvence.<\/li>\n<li><strong>Ztr\u00e1ta rozli\u0161en\u00ed:<\/strong> rozpt\u00fdlen\u00e1 energie zved\u00e1 \u0161umovou hladinu kolem velk\u00e9ho vrcholu a zakr\u00fdv\u00e1 men\u0161\u00ed sousedn\u00ed vrcholy \u2013 p\u0159esn\u011b ty mal\u00e9 <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/harmonics\/\">harmonick\u00e9<\/a> a postrann\u00ed p\u00e1sma, kter\u00e1 \u010dasto obsahuj\u00ed diagnostick\u00e9 informace.<\/li>\n<\/ul>\n<h2>3. \u0158e\u0161en\u00ed: Pou\u017eit\u00ed okna<\/h2>\n<p>Okenn\u00ed funkce eliminuj\u00ed \u00faniky t\u00edm, \u017ee sign\u00e1l plynule p\u0159esm\u011bruj\u00ed do <em>look<\/em> v r\u00e1mci bloku. Vyn\u00e1soben\u00edm surov\u00e9ho sign\u00e1lu o okno se amplitudy na sam\u00e9m za\u010d\u00e1tku a konci z\u00fa\u017e\u00ed na nulu, \u010d\u00edm\u017e se odstran\u00ed okrajov\u00e9 nespojitosti a v podstat\u011b se tak FFT \u201evym\u00e1m\u00ed\u201c, aby vn\u00edmala sign\u00e1l jako souvisl\u00fd a bez mezer. V\u00fdsledkem je v\u00fdrazn\u011b \u010dist\u0161\u00ed spektrum:<\/p>\n<ul>\n<li>V\u00fdrazn\u011b se zv\u00fd\u0161ila p\u0159esnost m\u011b\u0159en\u00ed amplitudy, tak\u017ee v\u00fd\u0161k\u00e1m \u0161pi\u010dek lze d\u016fv\u011b\u0159ovat <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/vibration-severity\/\">intenzita vibrac\u00ed<\/a> limits.<\/li>\n<li>Ostr\u00e9 a jasn\u011bji vymezen\u00e9 frekven\u010dn\u00ed \u0161pi\u010dky, kter\u00e9 umo\u017e\u0148uj\u00ed p\u0159i\u0159adit poruchu ke konkr\u00e9tn\u00edmu \u0159\u00e1du nebo sou\u010d\u00e1sti.<\/li>\n<li>Ni\u017e\u0161\u00ed efektivn\u00ed \u0161umov\u00e1 hladina, d\u00edky n\u00ed\u017e vyniknou i slab\u00e9 sign\u00e1ly vedle t\u011bch siln\u00fdch.<\/li>\n<\/ul>\n<p>Je to nevyhnuteln\u011b kompromis. Z\u00fa\u017een\u00ed konc\u016f vede ke ztr\u00e1t\u011b \u010d\u00e1sti energie z\u00e1znamu a k m\u00edrn\u00e9mu roz\u0161\u00ed\u0159en\u00ed hlavn\u00edho spektr\u00e1ln\u00edho laloku, tak\u017ee pou\u017eit\u00ed okenn\u00edho filtru znamen\u00e1 v\u00fdm\u011bnu mal\u00e9ho zhor\u0161en\u00ed frekven\u010dn\u00edho rozli\u0161en\u00ed za v\u00fdrazn\u00e9 sn\u00ed\u017een\u00ed p\u0159esahu. Ka\u017ed\u00e9 okno p\u0159edstavuje jin\u00fd bod na t\u00e9to kompromisn\u00ed k\u0159ivce, a proto existuje n\u011bkolik r\u016fzn\u00fdch tvar\u016f.<\/p>\n<h2>4. B\u011b\u017en\u00e9 typy oken<\/h2>\n<p>Byly vyvinuty des\u00edtky okenn\u00edch funkc\u00ed, z nich\u017e ka\u017ed\u00e1 v\u00e1\u017e\u00ed \u010dasov\u00fd blok trochu jinak. Pro b\u011b\u017en\u00e9 strojn\u00ed pr\u00e1ce p\u0159evl\u00e1d\u00e1 jedna z nich.<\/p>\n<h3>Hanningovo okno<\/h3>\n<p>Na str\u00e1nk\u00e1ch <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/hanning-window\/\">Hanningovo okno<\/a> (vyv\u00fd\u0161en\u00e1 kosinov\u00e1 charakteristika) p\u0159edstavuje vynikaj\u00edc\u00ed kompromis mezi frekven\u010dn\u00edm rozli\u0161en\u00edm a p\u0159esnost\u00ed amplitudy a je doporu\u010dovan\u00fdm v\u00fdchoz\u00edm nastaven\u00edm pro prakticky v\u0161echna standardn\u00ed m\u011b\u0159en\u00ed vibrac\u00ed rotuj\u00edc\u00edch stroj\u016f. Pokud neexistuje konkr\u00e9tn\u00ed d\u016fvod pro volbu jin\u00e9ho \u0159e\u0161en\u00ed, m\u011blo by se v\u017edy zvolit Hanningovo okno. Je to spr\u00e1vn\u00e1 volba pro spojit\u00e9, \u0161iroce periodick\u00e9 sign\u00e1ly, kter\u00e9 p\u0159evl\u00e1daj\u00ed <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/condition-monitoring\/\">monitorov\u00e1n\u00ed stavu<\/a>.<\/p>\n<h3>Ostatn\u00ed okna<\/h3>\n<ul>\n<li><strong>Obd\u00e9ln\u00edkov\u00e9 okno (naz\u00fdvan\u00e9 tak\u00e9 &#8220;Uniform&#8221; nebo &#8220;None&#8221;):<\/strong> co\u017e je ekvivalentn\u00ed tomu, jako by se nepou\u017e\u00edvalo \u017e\u00e1dn\u00e9 okno. Nab\u00edz\u00ed nejlep\u0161\u00ed frekven\u010dn\u00ed rozli\u0161en\u00ed, ale nejhor\u0161\u00ed spektr\u00e1ln\u00ed \u00fanik, a je vhodn\u00e9 pouze v p\u0159\u00edpad\u011b, \u017ee je zn\u00e1mo, \u017ee sign\u00e1l je v r\u00e1mci bloku dokonale periodick\u00fd \u2013 nebo p\u0159i sn\u00edm\u00e1n\u00ed velmi ostr\u00fdch, zcela ohrani\u010den\u00fdch p\u0159echodov\u00fdch jev\u016f, jako je nap\u0159\u00edklad n\u00e1raz.<\/li>\n<li><strong>Okno Flattop:<\/strong> poskytuje nejp\u0159esn\u011bj\u0161\u00ed m\u011b\u0159en\u00ed amplitudy ze v\u0161ech b\u011b\u017en\u00fdch oken, av\u0161ak za cenu velmi n\u00edzk\u00e9ho frekven\u010dn\u00edho rozli\u0161en\u00ed (velmi \u0161irok\u00e9 \u0161pi\u010dky). Jedn\u00e1 se o okno prvn\u00ed volby pro kalibra\u010dn\u00ed pr\u00e1ce a pro v\u0161echny \u00fakoly, kde je vy\u017eadov\u00e1na p\u0159esn\u00e1 <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/amplitude\/\">amplituda<\/a> d\u016fle\u017eit\u011bj\u0161\u00ed je tvar sign\u00e1lu ne\u017e jeho p\u0159esn\u00e1 frekvence \u2013 nap\u0159\u00edklad p\u0159i ov\u011b\u0159ov\u00e1n\u00ed senzoru proti <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/calibration-certificate\/\">kalibra\u010dn\u00ed certifik\u00e1t<\/a> na zn\u00e1m\u00e9m referen\u010dn\u00edm vibra\u010dn\u00edm za\u0159\u00edzen\u00ed.<\/li>\n<li><strong>Hammingovo okno:<\/strong> \u00fazce souvis\u00ed s Hanningov\u00fdm oknem, s nepatrn\u00fdmi kompromisy v chov\u00e1n\u00ed postrann\u00edch lalok\u016f; p\u0159i b\u011b\u017en\u00e9 diagnostice stroj\u016f se pou\u017e\u00edv\u00e1 jen z\u0159\u00eddka.<\/li>\n<\/ul>\n<h2>5. Kdy pou\u017e\u00edt okno \u2013 a jak to souvis\u00ed s rozli\u0161en\u00edm<\/h2>\n<p>Pro monitorov\u00e1n\u00ed stavu stroj\u016f plat\u00ed jednoduch\u00e9 pravidlo: <strong>v\u017edy pou\u017e\u00edvejte Hanningovo okno<\/strong> pro obecnou spektr\u00e1ln\u00ed anal\u00fdzu. Vypnut\u00ed okna \u2013 v\u00fdb\u011br mo\u017enosti \u201eRectangular\u201c u b\u011b\u017en\u00e9ho sign\u00e1lu \u2013 vede k nep\u0159esn\u00fdm a potenci\u00e1ln\u011b zav\u00e1d\u011bj\u00edc\u00edm \u00fadaj\u016fm, proto\u017ee \u00faniky sign\u00e1lu zkresl\u00ed jak v\u00fd\u0161ky \u0161pi\u010dek, tak zd\u00e1nlivou \u00farove\u0148 \u0161umu. Modern\u00ed p\u0159\u00edstroje ve v\u00fdchoz\u00edm nastaven\u00ed pou\u017e\u00edvaj\u00ed Hanningovo okno pr\u00e1v\u011b proto, \u017ee je nezbytn\u00e9 pro spolehliv\u00e9 a p\u0159esn\u00e9 spektrum.<\/p>\n<p>Ok\u00e9nkov\u00e1n\u00ed nep\u016fsob\u00ed samostatn\u011b. Proto\u017ee okno z\u00fa\u017euj\u00edc\u00ed se na okraj\u00edch roz\u0161i\u0159uje jednotliv\u00e9 spektr\u00e1ln\u00ed \u010d\u00e1ry, je v\u00fdsledn\u00e9 frekven\u010dn\u00ed rozli\u0161en\u00ed kombinovan\u00fdm v\u00fdsledkem volby ok\u00e9nka a parametr\u016f anal\u00fdzy \u2013 d\u00e9lky bloku (po\u010dtu vzork\u016f), vzorkovac\u00ed frekvence a rozsahu. Pokud jsou p\u00edky velmi bl\u00edzko u sebe, zv\u00fd\u0161en\u00ed d\u00e9lky \u010dasov\u00e9ho z\u00e1znamu zlep\u0161uje rozli\u0161en\u00ed rychleji ne\u017e zm\u011bna ok\u00e9nka; tento kompromis si m\u016f\u017eete p\u0159edem prohl\u00e9dnout pomoc\u00ed <a href=\"https:\/\/vibromera.eu\/cs\/calculators\/fft-resolution-calculator\/\">Kalkul\u00e1tor rozli\u0161en\u00ed FFT<\/a> ne\u017e se rozhodnete pro konkr\u00e9tn\u00ed m\u011b\u0159ic\u00ed uspo\u0159\u00e1d\u00e1n\u00ed. Metoda oken je tak\u00e9 odli\u0161n\u00e1 od a z\u00e1rove\u0148 dopl\u0148uje <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/signal-filtering\/\">filtrov\u00e1n\u00ed sign\u00e1lu<\/a>: filtr odstra\u0148uje ze sign\u00e1lu ne\u017e\u00e1douc\u00ed frekven\u010dn\u00ed p\u00e1sma, zat\u00edmco okno upravuje zb\u00fdvaj\u00edc\u00ed p\u00e1smo tak, aby jej FFT mohla v\u011brn\u011b zobrazit.<\/p>\n<h2>6. Ok\u00e9nkov\u00e1n\u00ed v ter\u00e9nu<\/h2>\n<p>P\u0159i praktick\u00e9 diagnostice analytik na okno m\u00e1lokdy v\u011bdom\u011b mysl\u00ed \u2013 a to je z\u00e1m\u011br. Kdy\u017e technik zaznamen\u00e1v\u00e1 spektrum nebo prov\u00e1d\u00ed vyva\u017eov\u00e1n\u00ed pomoc\u00ed p\u0159enosn\u00e9ho dvoukan\u00e1lov\u00e9ho p\u0159\u00edstroje, jako je nap\u0159\u00edklad <a href=\"https:\/\/vibromera.eu\/cs\/produkt\/balanset-1\/\">Balanset-1A<\/a>, software p\u0159ed v\u00fdpo\u010dtem FFT automaticky pou\u017eije Hanningovo okno, tak\u017ee 1\u00d7 <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/running-speed\/\">provozn\u00ed ot\u00e1\u010dky<\/a> \u0161pi\u010dka a jej\u00ed harmonick\u00e9 se zobrazuj\u00ed se skute\u010dnou amplitudou a spr\u00e1vnou frekvenc\u00ed bez jak\u00fdchkoli dal\u0161\u00edch krok\u016f. Pr\u00e1v\u011b toto spr\u00e1vn\u011b okenovan\u00e9 spektrum umo\u017e\u0148uje stejn\u00e9mu p\u0159\u00edstroji odli\u0161it skute\u010dn\u00fd <a href=\"https:\/\/vibromera.eu\/cs\/glossary\/unbalance\/\">nevyv\u00e1\u017eenost<\/a> od bl\u00edzk\u00e9ho \u0161umu a po korekci v\u00fdsledek ov\u011b\u0159it. Pochopen\u00ed toho, jak okno ve skute\u010dnosti funguje, pom\u00e1h\u00e1 analytikovi rozpoznat, kdy je skute\u010dn\u011b na m\u00edst\u011b pou\u017e\u00edt jin\u00e9 ne\u017e v\u00fdchoz\u00ed nastaven\u00ed \u2013 nap\u0159\u00edklad \u201eFlattop\u201c pro kontrolu kalibrace nebo \u201eRectangular\u201c pro \u010dist\u00fd p\u0159echodov\u00fd sign\u00e1l.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/cs\/glossary\/\">\u2190 Zp\u011bt na hlavn\u00ed index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Pr\u016fvodce okenovac\u00edmi funkcemi (jako je Hanning) v FFT anal\u00fdze. Zjist\u011bte, pro\u010d je okenov\u00e1n\u00ed nezbytn\u00e9 pro minimalizaci spektr\u00e1ln\u00edho \u00faniku a zaji\u0161t\u011bn\u00ed p\u0159esn\u00fdch m\u011b\u0159en\u00ed vibrac\u00ed.<\/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\/cs\/wp-json\/wp\/v2\/glossary\/311","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/glossary\/311\/revisions"}],"predecessor-version":[{"id":101322,"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/glossary\/311\/revisions\/101322"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/media?parent=311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/categories?post=311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/cs\/wp-json\/wp\/v2\/tags?post=311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}