{"id":36041,"date":"2023-06-28T16:00:59","date_gmt":"2023-06-28T14:00:59","guid":{"rendered":"https:\/\/www.wwwtest.lsi-lastem.com\/?p=36041"},"modified":"2024-05-27T12:59:19","modified_gmt":"2024-05-27T12:59:19","slug":"delay-distance-e-damping-ratio","status":"publish","type":"post","link":"https:\/\/lsi-lastem.com\/it\/delay-distance-e-damping-ratio\/","title":{"rendered":"Come la Delay Distance e il Damping Ratio influenzano le prestazioni degli anemometri"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"36041\" class=\"elementor elementor-36041\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b8a204 e-flex e-con-boxed e-con e-parent\" data-id=\"6b8a204\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4ec16ae elementor-widget elementor-widget-heading\" data-id=\"4ec16ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Come la Delay Distance e il Damping Ratio influenzano le prestazioni degli anemometri<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c7a595c elementor-widget elementor-widget-image\" data-id=\"c7a595c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1180\" height=\"490\" src=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna.webp\" class=\"attachment-full size-full wp-image-107330\" alt=\"\" srcset=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna.webp 1180w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna-300x125.webp 300w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna-1024x425.webp 1024w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna-768x319.webp 768w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/AnyConv.com__Delay-Distance-e-Damping-Ratio-ITA-Interna-1000x415.webp 1000w\" sizes=\"(max-width: 1180px) 100vw, 1180px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ea93bb5 e-flex e-con-boxed e-con e-parent\" data-id=\"ea93bb5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7014535 elementor-widget elementor-widget-text-editor\" data-id=\"7014535\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Gli\u00a0<a href=\"\/prodotto\/tacogonioanemometri\/\" target=\"_blank\" rel=\"noopener\"><b>anemometri<\/b><\/a><b>\u00a0a coppe e banderuola<\/b>\u00a0sono contraddistinti da diverse\u00a0<b>caratteristiche tecniche<\/b>, che concorrono a determinare la qualit\u00e0 della misura raccolta, sia essa di velocit\u00e0 o di direzione del vento.<\/p><p>In questo articolo ci soffermeremo su quelle caratteristiche che vanno a caratterizzare il comportamento di uno strumento di misura del vento durante le condizioni di regime dinamico, ovvero quando le condizioni ambientali variano repentinamente prima di raggiungere la stabilit\u00e0.<\/p><p>Il parametro utilizzato per la qualificazione della risposta dinamica degli anemometri a coppe \u00e8 la\u00a0<b>Delay Distance<\/b>\u00a0(dR) o\u00a0<b>Distance Constant<\/b>\u00a0(LU), descritta nelle norme VDI 3786-2 2000 e ASTM 5096-96.<\/p><p>La risposta dinamica di un misuratore di direzione del vento a banderuola \u00e8 qualificata invece sia dalla\u00a0<b>Delay Distance<\/b>\u00a0(dR) sia dal\u00a0<b>Damping Ratio<\/b>\u00a0(D) o\u00a0<b>Damping Coefficient<\/b>, come descritti nelle norme di riferimento VDI3786-2 e ASTM 5366-96.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba479a4 elementor-widget elementor-widget-heading\" data-id=\"ba479a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Misura della velocit\u00e0 del vento: cosa considerare?\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e3cd385 elementor-widget elementor-widget-text-editor\" data-id=\"e3cd385\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><div><p>Durante una variazione di velocit\u00e0 del vento, qualsiasi anemometro non rileva immediatamente il cambiamento poich\u00e9, come in qualsiasi processo di misurazione, \u00e8 presente un certo ritardo dovuto all\u2019inerzia.<\/p><p>La\u00a0<b>Delay Distance<\/b>\u00a0\u00e8 un parametro che permette di quantificare l\u2019inerzia dello strumento nel rispondere alla variazione di velocit\u00e0 del vento e indica il tragitto (in metri) percorso da un volume di vento, dopo una variazione repentina di velocit\u00e0, in un tempo pari al 63% (o una costante di tempo \u03c4) del tempo totale necessario dallo strumento per raggiungere la nuova velocit\u00e0.<\/p><p>La Delay Distance viene calcolata moltiplicando la velocit\u00e0 del vento per una costante di tempo specifica, ottenuta considerando l\u2019intervallo di tempo tra il momento in cui si misura il 30% della nuova velocit\u00e0 del vento e il 74% della stessa. Questa procedura \u00e8 rappresentata in dettaglio nella Figura 1.<\/p><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-235251c elementor-widget-mobile__width-initial elementor-widget elementor-widget-image\" data-id=\"235251c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"900\" height=\"490\" src=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-1-interna-1.png\" class=\"attachment-large size-large wp-image-107336\" alt=\"La Delay Distance\" srcset=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-1-interna-1.png 900w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-1-interna-1-300x163.png 300w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-1-interna-1-768x418.png 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8cc67ef elementor-widget elementor-widget-text-editor\" data-id=\"8cc67ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><div><p>Figura 1 \u2013 Andamento della misura della velocit\u00e0 del vento nel tempo (ISO 17713-1 2007 pag. 5).<\/p><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28206e5 elementor-widget elementor-widget-text-editor\" data-id=\"28206e5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>La formula per il calcolo della Delay Distance \u00e8 la seguente:<\/p><p><strong>dR= U *\u00a0\u03c4<\/strong><\/p><p>Con:<br \/>U: velocit\u00e0 del vento;<br \/>\u03c4: costante di tempo.<\/p><p>Minore \u00e8 la Delay Distance, e quindi la costante di tempo, pi\u00f9 veloce sar\u00e0 la risposta dell\u2019anemometro a coppe nel raggiungere la misura della nuova velocit\u00e0.<\/p><p>La norma ASTM 5096-96 richiede che la Delay Distance venga calcolata per i valori di velocit\u00e0 del vento di 5 m\/s e 10 m\/s. Affinch\u00e9 un anemometro possa essere considerato accurato il valore accettabile di Delay Distance dovrebbe essere \u2264 4\u20265 m (VDI3786-2).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e7ac397 elementor-widget elementor-widget-heading\" data-id=\"e7ac397\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Misura della direzione del vento: cosa considerare?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fd24c87 elementor-widget elementor-widget-text-editor\" data-id=\"fd24c87\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><p>In questo caso, la\u00a0<b>Delay Distance<\/b>\u00a0rappresenta la distanza (espressa in metri) che il vento percorre nel tempo in cui la banderuola si sposta dalla sua posizione iniziale al 50% della sua posizione finale, a seguito della variazione di regime anemometrico.<\/p><p>Il valore della Delay Distance dipende dalla densit\u00e0 dell\u2019aria e si ottiene moltiplicando la velocit\u00e0 dell\u2019aria per una costante di tempo, come nel caso precedente. In questo caso, la costante di tempo\u00a0\u03c4\u00a0rappresenta il tempo (in secondi) necessario affinch\u00e9 il sensore a banderuola si sposti dalla sua posizione iniziale al 50% della sua posizione finale.<\/p><p>Per un gonioanemometro con una buona risposta alle variazioni del regime anemologico, la Delay Distance dovrebbe essere inferiore a 5 m.<\/p><p>Un altro parametro importante per la qualificazione dei sensori a banderuola, \u00e8 il\u00a0<b>Damping Coefficient<\/b>.<\/p><p>Durante un improvviso cambio di direzione del vento, la banderuola si allineer\u00e0 lungo la nuova direzione y0. Dopo aver raggiunto la posizione finale, la banderuola osciller\u00e0 intorno a y0 per alcuni secondi prima di stabilizzarsi. Questa oscillazione sar\u00e0 debolmente smorzata dalla pressione dell\u2019aria.<\/p><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad1cae4 elementor-widget elementor-widget-image\" data-id=\"ad1cae4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"900\" height=\"490\" src=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-2-interna.png\" class=\"attachment-large size-large wp-image-107338\" alt=\"valore della Delay Distance\" srcset=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-2-interna.png 900w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-2-interna-300x163.png 300w, https:\/\/lsi-lastem.com\/wp-content\/uploads\/figura-2-interna-768x418.png 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87d5ec9 elementor-widget elementor-widget-text-editor\" data-id=\"87d5ec9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><p>Figura 2 \u2013 Schematizzazione del movimento della banderuola dalla posizione iniziale a quella finale (sinistra); grafico delle oscillazioni della banderuola nel tempo al variare del Damping Ratio (h), con comportamento smorzato, non smorzato e debolmente smorzato (destra).<\/p><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aa96ad6 elementor-widget elementor-widget-text-editor\" data-id=\"aa96ad6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Il Damping Coefficient deve assumere valori D &lt; 0,6 per garantire un debole smorzamento della banderuola. Secondo le indicazioni della norma VDI3786-2, i valori ottimali del coefficiente per mantenere la banderuola in campo debolmente smorzato sono tra 0,2 e 0,3.<\/p><p>Il Damping Ratio \u00e8 dato dalla seguente relazione:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e64331 elementor-widget-mobile__width-initial elementor-widget elementor-widget-image\" data-id=\"7e64331\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"162\" src=\"https:\/\/lsi-lastem.com\/wp-content\/uploads\/formula-300x162-1.png\" class=\"attachment-large size-large wp-image-107340\" alt=\"Damping Ratio\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a4465c elementor-widget elementor-widget-text-editor\" data-id=\"9a4465c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Con:<br \/>a1: ampiezza prima oscillazione<br \/>a3: ampiezza seconda oscillazione<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ff9eb68 e-flex e-con-boxed e-con e-parent\" data-id=\"ff9eb68\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-8f0e907 e-con-full e-flex e-con e-child\" data-id=\"8f0e907\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-562a0c4 elementor-widget elementor-widget-heading\" 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