{"id":158,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/low-pass-filter\/"},"modified":"2026-05-23T22:43:47","modified_gmt":"2026-05-23T22:43:47","slug":"low-pass-filter","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ro\/glossary\/low-pass-filter\/","title":{"rendered":"Ce este un filtru trece-jos? Anti-aliasing \u0219i netezire"},"content":{"rendered":"<h1>\u00cen\u021belegerea filtrelor trece-jos<\/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\/ro\/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\/ro\/product\/balanset-1\/\" title=\"Echilibrator portabil \u0219i analizor de vibra\u021bii 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=\"Balanset-1A kit complet \u2014 echilibrator portabil \u0219i analizor de vibra\u021bii\" 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\/ro\/product-category\/devices\/\" rel=\"tag\">Dispozitive<\/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\/ro\/product\/balanset-1\/\" title=\"Echilibrator portabil \u0219i analizor de vibra\u021bii Balanset-1A\">Echilibrator portabil \u0219i analizor de vibra\u021bii 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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Portable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201ePortable balancer &amp; Vibration analyzer Balanset-1A\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/product\/vibration-sensor\/\" title=\"Senzor de vibra\u021bii\">\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=\"Prim-plan senzor de vibra\u021bii 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\/ro\/product-category\/parts\/\" rel=\"tag\">Piese<\/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\/ro\/product\/vibration-sensor\/\" title=\"Senzor de vibra\u021bii\">Senzor de vibra\u021bii<\/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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Vibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201eVibration sensor\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Senzor optic (tahometru cu 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=\"Senzor optic (tahometru cu 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\/ro\/product-category\/parts\/\" rel=\"tag\">Piese<\/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\/ro\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Senzor optic (tahometru cu laser)\">Senzor optic (tahometru cu 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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Optical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201eOptical Sensor (Laser Tachometer)\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/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=\"Kit de echilibrare a rotorului Vibromera: geant\u0103 de transport, condi\u021bioner de semnal multicanal, analizor portabil, baz\u0103 magnetic\u0103, senzori de vibra\u021bii \u0219i cabluri spiralate.\" 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\/ro\/product-category\/devices\/\" rel=\"tag\">Dispozitive<\/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\/ro\/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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Balanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201eBalanset-4\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/product\/magnet-stand\/\" title=\"Stand magnetic 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=\"Baza magnetic\u0103.\" 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\/ro\/product-category\/parts\/\" rel=\"tag\">Piese<\/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\/ro\/product\/magnet-stand\/\" title=\"Stand magnetic Insize-60-kgf\">Stand magnetic 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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Magnetic Stand Insize-60-kgf\u201d\" rel=\"nofollow\" data-success_message=\"\u201eMagnetic Stand Insize-60-kgf\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/product\/reflective-tape\/\" title=\"Band\u0103 reflectorizant\u0103\">\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=\"Band\u0103 reflectorizant\u0103\" 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\/ro\/product-category\/parts\/\" rel=\"tag\">Piese<\/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\/ro\/product\/reflective-tape\/\" title=\"Band\u0103 reflectorizant\u0103\">Band\u0103 reflectorizant\u0103<\/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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Reflective tape\u201d\" rel=\"nofollow\" data-success_message=\"\u201eReflective tape\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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\/ro\/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\/ro\/product\/dynamic-balancer-balanset-1a\/\" title=\"Echilibrator dinamic &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=\"Con\u021binutul kitului Balanset-1A cu unitate de interfa\u021b\u0103, senzori, tahometru \u0219i accesorii\" 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\/ro\/product-category\/devices\/\" rel=\"tag\">Dispozitive<\/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\/ro\/product\/dynamic-balancer-balanset-1a\/\" title=\"Echilibrator dinamic &quot;Balanset-1A&quot; OEM\">Echilibrator dinamic \"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> + TVA (dac\u0103 este cazul)<\/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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Adaug\u0103 \u00een co\u0219\" 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=\"\/ro\/wp-json\/wp\/v2\/glossary\/158?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=\"Adaug\u0103 \u00een co\u0219: &amp;lbquo;Dynamic balancer \u201cBalanset-1A\u201d OEM\u201d\" rel=\"nofollow\" data-success_message=\"\u201eDynamic balancer \u201cBalanset-1A\u201d OEM\u201d a fost ad\u0103ugat \u00een co\u0219\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Adaug\u0103 \u00een co\u0219<\/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>A <strong>filtru trece-jos<\/strong> (LPF) este un element de procesare a semnalului cu selectarea frecven\u021bei care permite <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/vibration\/\">vibra\u021bii<\/a> componentele sub o frecven\u021b\u0103 de t\u0103iere aleas\u0103 trec prin ea, atenu\u00e2nd \u00een acela\u0219i timp componentele peste aceasta. \u00cen <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/vibration-analysis\/\">analiza vibra\u021biilor<\/a> acesta \u00eendepline\u0219te trei sarcini de care un analizor nu se poate lipsi: anti-aliasing (\u00eempiedicarea apari\u021biei frecven\u021belor false \u00een datele digitale), reducerea zgomotului \u0219i izolarea regiunii de joas\u0103 frecven\u021b\u0103 pentru un studiu concentrat. Este imaginea \u00een oglind\u0103 a <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/high-pass-filter\/\">filtru trece-sus<\/a>, iar cele dou\u0103 sunt elementele de baz\u0103 ale tuturor celorlalte <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/signal-filtering\/\">filtrarea semnalului<\/a> schem\u0103.<\/p>\n<p>Filtrele trece-jos sunt, f\u0103r\u0103 \u00eendoial\u0103, cele mai utilizate filtre \u00een instrumenta\u021bia pentru vibra\u021bii. Unul se afl\u0103 \u00een fa\u021ba convertorului \u00een fiecare sistem de digitizare ca filtru anti-aliasing obligatoriu, iar aceea\u0219i func\u021bie este oferit\u0103 ca instrument de analiz\u0103 pentru netezirea datelor, eliminarea zgomotului de \u00eenalt\u0103 frecven\u021b\u0103 \u0219i concentrarea asupra fenomenelor de joas\u0103 frecven\u021b\u0103. Prin urmare, \u00een\u021belegerea modului \u00een care acestea modeleaz\u0103 un semnal este esen\u021bial\u0103 pentru a avea \u00eencredere \u00een orice <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/spectrum\/\">spectru<\/a> pe care \u00eel citi\u021bi.<\/p>\n<h2>1. Caracteristicile filtrului<\/h2>\n<h3>Frecven\u021ba de t\u0103iere (f<sub>c<\/sub>)<\/h3>\n<ul>\n<li><strong>Defini\u0163ie:<\/strong> frecven\u021ba la care r\u0103spunsul filtrului a sc\u0103zut la -3 dB, adic\u0103 70,7% din amplitudinea benzii de trecere.<\/li>\n<li><strong>Sub f<sub>c<\/sub> (banda de trecere):<\/strong> frecven\u021bele trec cu atenuare minim\u0103.<\/li>\n<li><strong>Deasupra f<sub>c<\/sub> (band\u0103 de oprire):<\/strong> frecven\u021bele sunt atenuate progresiv.<\/li>\n<li><strong>Band\u0103 de tranzi\u021bie:<\/strong> regiunea din jurul lui f<sub>c<\/sub> unde atenuarea cre\u0219te constant.<\/li>\n<\/ul>\n<h3>Ordinul filtrului \u0219i panta de atenuare<\/h3>\n<p>Ordinul unui filtru stabile\u0219te c\u00e2t de brusc\u0103 este tranzi\u021bia de la banda de trecere la banda de oprire:<\/p>\n<ul>\n<li><strong>Ordinul 1:<\/strong> 6 dB\/octav\u0103 (20 dB\/decad\u0103) - cobor\u00e2re treptat\u0103.<\/li>\n<li><strong>Ordinul 2:<\/strong> 12 dB\/octav\u0103 (40 dB\/decad\u0103) - moderat.<\/li>\n<li><strong>Ordinul 4:<\/strong> 24 dB\/octav\u0103 (80 dB\/decad\u0103) - abrupt.<\/li>\n<li><strong>Ordinul 8:<\/strong> 48 dB\/octav\u0103 (160 dB\/decad\u0103) - foarte abrupt.<\/li>\n<li><strong>Ordin superior:<\/strong> o tranzi\u021bie mai precis\u0103 \u0219i o mai bun\u0103 respingere a benzii de oprire, cu pre\u021bul unei defazaje mai mari \u0219i al unui r\u0103spuns tranzitoriu mai lung.<\/li>\n<\/ul>\n<h3>Tipuri de r\u0103spunsuri de filtrare<\/h3>\n<p>Aceea\u0219i frecven\u021b\u0103 de t\u0103iere \u0219i acela\u0219i ordin pot fi realizate cu diferite forme matematice, fiecare oferind un compromis \u00eentre planeitate, abrupte\u021be \u0219i comportamentul de faz\u0103:<\/p>\n<ul>\n<li><strong>Butterworth:<\/strong> band\u0103 de trecere maxim plat\u0103, f\u0103r\u0103 ondula\u021bie.<\/li>\n<li><strong>Ceb\u00ee\u0219ev:<\/strong> o t\u0103iere mai ascu\u021bit\u0103, accept\u00e2nd ondularea \u00een banda de trecere.<\/li>\n<li><strong>Bessel:<\/strong> faz\u0103 liniar\u0103, ceea ce \u00eenseamn\u0103 distorsiuni minime ale formei de und\u0103 - alegerea potrivit\u0103 atunci c\u00e2nd forma <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/time-waveform\/\">form\u0103 de und\u0103 temporal\u0103<\/a> conteaz\u0103.<\/li>\n<li><strong>Eliptic:<\/strong> cea mai brusc\u0103 tranzi\u021bie posibil\u0103, cu ondula\u021bie at\u00e2t \u00een banda de trecere, c\u00e2t \u0219i \u00een banda de oprire.<\/li>\n<\/ul>\n<h2>2. Aplica\u021bii primare<\/h2>\n<h3>Anti-Aliasing (cel mai important)<\/h3>\n<p>Aceasta este func\u021bia pe care niciun digitizor nu o poate omite. F\u0103r\u0103 ea, frecven\u021bele peste limita Nyquist se pliaz\u0103 \u00eenapoi \u0219i apar ca v\u00e2rfuri false - fenomenul de <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/aliasing\/\">aliasare<\/a>.<\/p>\n<ul>\n<li><strong>Scop:<\/strong> blocheaz\u0103 frecven\u021bele peste frecven\u021ba Nyquist (jum\u0103tate din rata de e\u0219antionare).<\/li>\n<li><strong>Cerin\u0163\u0103:<\/strong> trebuie s\u0103 ac\u021bioneze <em>\u00eenainte<\/em> conversie analog-digital\u0103 - software-ul nu poate elimina un alias dup\u0103 ce a fost realizat.<\/li>\n<li><strong>Frecven\u021b\u0103 de t\u0103iere tipic\u0103:<\/strong> 0,4-0,8 \u00d7 (rata de e\u0219antionare \/ 2).<\/li>\n<li><strong>Abrupte\u021be:<\/strong> De obicei, ordinul 8 sau mai mare pentru o respingere bun\u0103 a aliasingului<\/li>\n<li><strong>Consecin\u021ba neglij\u0103rii:<\/strong> anti-aliasarea inadecvat\u0103 creeaz\u0103 v\u00e2rfuri spectrale false care imit\u0103 defectele reale.<\/li>\n<\/ul>\n<h3>Reducerea zgomotului<\/h3>\n<ul>\n<li>\u00cendep\u0103rteaz\u0103 zgomotul electric de \u00eenalt\u0103 frecven\u021b\u0103.<\/li>\n<li>Filtreaz\u0103 zgomotul cablului senzorului.<\/li>\n<li>Neteze\u0219te datele pentru <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/trending\/\">tendin\u021be<\/a>.<\/li>\n<li>\u00cembun\u0103t\u0103\u021be\u0219te raportul semnal\/zgomot pentru componentele de interes de joas\u0103 frecven\u021b\u0103.<\/li>\n<\/ul>\n<h3>Limitarea gamei de frecven\u021be<\/h3>\n<ul>\n<li>Focalizeaz\u0103 analiza pe gama de frecven\u021be de interes.<\/li>\n<li>Exemplu: o analiz\u0103 0&ndash;100 Hz pentru ma\u0219ini cu vitez\u0103 redus\u0103.<\/li>\n<li>Elimin\u0103 con\u021binutul irelevant de \u00eenalt\u0103 frecven\u021b\u0103.<\/li>\n<li>Reduce cerin\u021bele de procesare \u0219i stocare a datelor.<\/li>\n<\/ul>\n<h3>Preg\u0103tirea integr\u0103rii<\/h3>\n<ul>\n<li>Aplicat \u00eenainte de <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/integration\/\">integrarea<\/a> <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/acceleration\/\">accelera\u021bie<\/a> la <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/velocity\/\">vitez\u0103<\/a>.<\/li>\n<li>Elimin\u0103 frecven\u021bele foarte \u00eenalte - zgomotul pe care integrarea l-ar amplifica altfel.<\/li>\n<li>Frecven\u021b\u0103 de t\u0103iere tipic\u0103: 1000&ndash;5000 Hz, \u00een func\u021bie de aplica\u021bie.<\/li>\n<li>Previne amplificarea zgomotului care afecteaz\u0103 integrarea necontrolat\u0103.<\/li>\n<\/ul>\n<h2>3. Selectarea frecven\u021bei de t\u0103iere<\/h2>\n<h3>Aplica\u021bii anti-aliasing<\/h3>\n<ul>\n<li><strong>Regul\u0103:<\/strong> f<sub>c<\/sub> = 0,4 &times; rata de e\u0219antionare (conservator) p\u00e2n\u0103 la 0,8 &times; rata de e\u0219antionare (agresiv).<\/li>\n<li><strong>Exemplu:<\/strong> o rat\u0103 de e\u0219antionare de 10 kHz d\u0103 f<sub>c<\/sub> = 4000 Hz.<\/li>\n<li><strong>Criteriu:<\/strong> atenuare a benzii de oprire mai mare de 60 dB la frecven\u021ba Nyquist.<\/li>\n<\/ul>\n<h3>Aplica\u021bii analitice<\/h3>\n<ul>\n<li>Seta\u021bi f<sub>c<\/sub> chiar deasupra celei mai \u00eenalte frecven\u021be de interes.<\/li>\n<li>Pentru analiza frecven\u021belor joase (0&ndash;200 Hz): f<sub>c<\/sub> = 200&ndash;300 Hz.<\/li>\n<li>Pentru <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/unbalance\/\">dezechilibru<\/a> numai (componenta 1&times;): f<sub>c<\/sub> = 5&ndash;10&times; <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/running-speed\/\">vitez\u0103 de func\u021bionare<\/a>.<\/li>\n<li>L\u0103sa\u021bi \u00eentotdeauna o marj\u0103 pentru banda de tranzi\u021bie a filtrului.<\/li>\n<\/ul>\n<h3>Reducerea zgomotului<\/h3>\n<ul>\n<li>Identifica\u021bi gama de frecven\u021be a zgomotului din spectru.<\/li>\n<li>Seta\u021bi f<sub>c<\/sub> pentru a transmite frecven\u021bele semnalului, resping\u00e2nd \u00een acela\u0219i timp frecven\u021bele de zgomot.<\/li>\n<li>Echilibra\u021bi eliminarea zgomotului cu conservarea semnalului.<\/li>\n<\/ul>\n<h2>4. Efectele asupra m\u0103sur\u0103torilor<\/h2>\n<h3>Domeniul Amplitudinii<\/h3>\n<ul>\n<li><strong>Band\u0103 de trecere:<\/strong> modificare minim\u0103 a amplitudinii, de obicei mai mic\u0103 de 0,5 dB.<\/li>\n<li><strong>Band\u0103 de oprire:<\/strong> atenuare puternic\u0103, 40&ndash;80 dB sau mai mult.<\/li>\n<li><strong>Nivelul general:<\/strong> filtrul reduce valoarea total\u0103 a vibra\u021biilor dac\u0103 a fost prezent un con\u021binut semnificativ de \u00eenalt\u0103 frecven\u021b\u0103.<\/li>\n<\/ul>\n<h3>Domeniul Timpului<\/h3>\n<ul>\n<li>Forma de und\u0103 este netezit\u0103 pe m\u0103sur\u0103 ce varia\u021biile de \u00eenalt\u0103 frecven\u021b\u0103 sunt eliminate.<\/li>\n<li>Marginile ascu\u021bite \u0219i v\u00e2rfurile sunt rotunjite.<\/li>\n<li>R\u0103spunsul tranzitoriu (sonerie filtru) poate afecta forma formei de und\u0103<\/li>\n<li>Distorsiunea de faz\u0103 poate modifica modul \u00een care este interpretat\u0103 forma de und\u0103.<\/li>\n<\/ul>\n<h3>Domeniul de frecven\u021b\u0103<\/h3>\n<ul>\n<li>Spectrul prezint\u0103 amplitudini reduse deasupra limitei.<\/li>\n<li>V\u00e2rfurile de \u00eenalt\u0103 frecven\u021b\u0103 sunt diminuate sau eliminate.<\/li>\n<li>Nivelul de zgomot este redus dac\u0103 zgomotul a fost de \u00eenalt\u0103 frecven\u021b\u0103.<\/li>\n<\/ul>\n<h2>5. Probleme frecvente \u0219i solu\u021bii<\/h2>\n<h3>Anti-aliasing inadecvat<\/h3>\n<ul>\n<li><strong>Simptom:<\/strong> v\u00e2rfuri false de joas\u0103 frecven\u021b\u0103 \u00een spectru.<\/li>\n<li><strong>Cauza:<\/strong> frecven\u021bele \u00eenalte se pliaz\u0103 \u00eenapoi sub Nyquist.<\/li>\n<li><strong>Solu\u021bie:<\/strong> utiliza\u021bi un filtru mai abrupt, m\u0103ri\u021bi rata de e\u0219antionare \u0219i verifica\u021bi dac\u0103 filtrul func\u021bioneaz\u0103 efectiv.<\/li>\n<\/ul>\n<h3>Frecven\u021b\u0103 de t\u0103iere prea joas\u0103<\/h3>\n<ul>\n<li><strong>Simptom:<\/strong> semnalele valide de \u00eenalt\u0103 frecven\u021b\u0103 sunt atenuate.<\/li>\n<li><strong>Exemplu:<\/strong> <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/bearing-fault-frequencies\/\">frecven\u021bele defectelor rulmen\u021bilor<\/a> redus\u0103 de un LPF prea agresiv.<\/li>\n<li><strong>Solu\u021bie:<\/strong> cre\u0219te\u021bi frecven\u021ba de t\u0103iere sau utiliza\u021bi o pant\u0103 de filtrare mai bl\u00e2nd\u0103.<\/li>\n<\/ul>\n<h3>Artefacte de filtrare<\/h3>\n<ul>\n<li><strong>Oscila\u021bii (ringing):<\/strong> oscila\u021bii \u00een domeniul timpului cauzate de o t\u0103iere brusc\u0103 a filtrului.<\/li>\n<li><strong>Distorsiunea de faz\u0103:<\/strong> modific\u0103ri ale formei de und\u0103 care rezult\u0103 din schimb\u0103rile de faz\u0103.<\/li>\n<li><strong>Solu\u021bie:<\/strong> utiliza\u021bi un filtru Bessel pentru aplica\u021bii cu forme de und\u0103 critice \u00een care liniaritatea de faz\u0103 este important\u0103.<\/li>\n<\/ul>\n<h2>6. Filtre complementare<\/h2>\n<h3>Trece-jos vs. Trece-sus<\/h3>\n<ul>\n<li><strong>Trece-jos:<\/strong> trece frecven\u021bele joase, blocheaz\u0103 frecven\u021bele \u00eenalte.<\/li>\n<li><strong>High-pass:<\/strong> trece frecven\u021bele \u00eenalte, blocheaz\u0103 frecven\u021bele joase.<\/li>\n<li><strong>Complementar:<\/strong> utilizate \u00eempreun\u0103 pentru a forma un filtru trece-band\u0103.<\/li>\n<\/ul>\n<h3>Filtru trece-band\u0103<\/h3>\n<ul>\n<li>O combina\u021bie de trepte trece-sus plus trece-jos.<\/li>\n<li>Rezultatul <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/band-pass-filter\/\">filtru trece-band\u0103<\/a> trece numai frecven\u021bele dintr-o band\u0103 specificat\u0103.<\/li>\n<li>Acesta respinge con\u021binutul at\u00e2t sub, c\u00e2t \u0219i peste aceast\u0103 band\u0103.<\/li>\n<li>Aceasta este partea frontal\u0103 a <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/envelope-analysis\/\">analiza anvelopei<\/a>, \u00een care o band\u0103 din jurul rezonan\u021bei structurale a unui rulment este izolat\u0103 \u00eenainte de demodulare.<\/li>\n<\/ul>\n<h2>7. Locul filtrului trece-jos \u00een domeniu<\/h2>\n<p>La un instrument de teren digital, filtrul trece-jos este aproape invizibil - \u00ee\u0219i desf\u0103\u0219oar\u0103 activitatea de anti-aliasare \u00een mod silen\u021bios \u00een cadrul lan\u021bului de achizi\u021bie - \u0219i totu\u0219i st\u0103 la baza fiabilit\u0103\u021bii fiec\u0103rei citiri. Un analizor portabil cu dou\u0103 canale, cum ar fi <a href=\"https:\/\/vibromera.eu\/ro\/produs\/balanset-1\/\">Balanset-1A<\/a> limiteaz\u0103 banda fiec\u0103rui <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/accelerometer\/\">accelerometru<\/a> \u00eenainte de e\u0219antionare, astfel \u00eenc\u00e2t <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/fft\/\">FFT<\/a> pe care \u00eel calculeaz\u0103 pentru echilibrare \u0219i diagnosticare este lipsit de v\u00e2rfuri aliasate \u00een \u00eentreaga sa gam\u0103 de lucru. Cu spectrul curat, analizorul poate distinge componenta 1&times; <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/phase\/\">amplitudine \u0219i faz\u0103<\/a> necesare pentru a echilibra un rotor \u0219i a raporta o valoare real\u0103 <a href=\"https:\/\/vibromera.eu\/ro\/glossary\/residual-unbalance\/\">dezechilibru rezidual<\/a>, mai degrab\u0103 dec\u00e2t s\u0103 urm\u0103reasc\u0103 o frecven\u021b\u0103 fantom\u0103 creat\u0103 de o filtrare necorespunz\u0103toare.<\/p>\n<p>Filtrele trece-jos sunt componente fundamentale ale sistemelor de m\u0103surare a vibra\u021biilor, \u00eendeplinind func\u021bii esen\u021biale de la protec\u021bia anti-aliasing la reducerea zgomotului \u0219i selectarea gamei de frecven\u021be. \u00cen\u021belegerea func\u021bion\u0103rii lor, alegerea corect\u0103 a frecven\u021bei de t\u0103iere \u0219i aprecierea efectului lor asupra semnalului m\u0103surat sunt esen\u021biale pentru o analiz\u0103 precis\u0103 \u0219i pentru evitarea artefactelor de m\u0103surare \u00een achizi\u021bia digital\u0103 de date.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ro\/glossary\/\">\u2190 \u00cenapoi la indexul principal<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u00cenv\u0103\u021ba\u021bi despre filtrele trece-jos \u00een analiza vibra\u021biilor, instrumente de procesare a semnalului care las\u0103 s\u0103 treac\u0103 frecven\u021bele joase \u00een timp ce blocheaz\u0103 frecven\u021bele \u00eenalte, esen\u021biale pentru anti-aliasing \u0219i reducerea zgomotului.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,110],"tags":[],"class_list":["post-158","glossary","type-glossary","status-publish","hentry","category-glossary","category-vibration-diagnostics"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/glossary\/158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/glossary\/158\/revisions"}],"predecessor-version":[{"id":101341,"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/glossary\/158\/revisions\/101341"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/media?parent=158"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/categories?post=158"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ro\/wp-json\/wp\/v2\/tags?post=158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}