{"id":4602,"date":"2026-08-12T14:46:57","date_gmt":"2026-08-12T12:46:57","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4602"},"modified":"2026-08-12T14:46:57","modified_gmt":"2026-08-12T12:46:57","slug":"calcul-de-fiabilite","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/es\/guide-dutilisateur\/calcul-de-fiabilite\/","title":{"rendered":"C\u00e1lculo de fiabilidad"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Ces calculatrices r\u00e9pondent \u00e0 la question du contrat :&nbsp;<strong>combien d&rsquo;unit\u00e9s, combien de temps, pour prouver la fiabilit\u00e9 annonc\u00e9e ?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se rellena el&nbsp;<strong>fiabilit\u00e9 \u00e0 d\u00e9montrer<\/strong>&nbsp;o el&nbsp;<strong>MTTF \u00e0 d\u00e9montrer<\/strong>el&nbsp;<strong>niveau de confiance<\/strong>, y la&nbsp;<strong>loi de fiabilit\u00e9 th\u00e9orique \u00e0 consid\u00e9rer<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conception plan de test<\/strong>\u00a0: d\u00e9montrer une valeur de fiabilit\u00e9 ;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Permet de calculer un r\u00e9sultat (l\u00e0 o\u00f9 on place le cadenas) en fonction des autres param\u00e8tres. Ex on calcule que pour d\u00e9montrer 90% de fiabilit\u00e9 \u00e0 1000 cycles avec une confiance de 95% Il faut 0 d\u00e9faillance sur 16 produits pendant 2000 cycles<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"964\" height=\"450\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite.png\" alt=\"\" class=\"wp-image-4604\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite.png 964w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite-300x140.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite-768x359.png 768w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite-18x8.png 18w\" sizes=\"auto, (max-width: 964px) 100vw, 964px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Conception plan Chi2<\/strong>\u00a0: d\u00e9montrer une fiabilit\u00e9 en cumulant les heures de fonctionnement. Fond\u00e9 sur la loi du Chi2, il d\u00e9termine le cumul de test n\u00e9cessaire ;<\/li>\n\n\n\n<li><strong>Conception plan MTTF<\/strong>\u00a0: d\u00e9montrer une valeur de MTTF ;<\/li>\n\n\n\n<li>\u00a0<strong>Temps d\u00e9faillance<\/strong>\u00a0: le temps de test n\u00e9cessaire pour obtenir la d\u00e9faillance de k produits. Par exemple si un produit suit une loi de Weibull avec beta = 1 et que l\u2019on esp\u00e8re un taux de fiabilit\u00e9 de 90% \u00e0 t = 100, Ellistat calcule de eta correspondant 968 (le cadenas = r\u00e9sultat) et la courbe donne le temps n\u00e9cessaire pour avoir les d\u00e9faillances en fonction du nombre de produits en test (ici 29)\u00a0<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"964\" height=\"540\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite2.png\" alt=\"\" class=\"wp-image-4605\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite2.png 964w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite2-300x168.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite2-768x430.png 768w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite2-18x10.png 18w\" sizes=\"auto, (max-width: 964px) 100vw, 964px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Le plan Chi2\u00a0<strong>suppose une loi exponentielle<\/strong>, c&rsquo;est-\u00e0-dire\u00a0\u03b2\u00a0= 1 donc un taux de d\u00e9faillance constant. C&rsquo;est une hypoth\u00e8se forte : si votre produit s&rsquo;use (\u03b2\u00a0> 1), le plan est optimiste. L&rsquo;application le signale explicitement. Ne l&rsquo;utiliser qu&rsquo;en r\u00e9gime de d\u00e9faillances al\u00e9atoires, ou en connaissance du biais.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\ud83d\udca1\u00a0La le\u00e7on habituelle de ces calculatrices est s\u00e9v\u00e8re : d\u00e9montrer une fiabilit\u00e9 \u00e9lev\u00e9e avec une forte confiance demande\u00a0<strong>beaucoup<\/strong>\u00a0d&rsquo;unit\u00e9s-heures. C&rsquo;est le bon argument pour n\u00e9gocier soit un essai acc\u00e9l\u00e9r\u00e9, soit un engagement plus r\u00e9aliste  et le bon moment pour le faire est avant la signature.<\/p>\n<\/blockquote>","protected":false},"featured_media":0,"menu_order":30,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[36],"class_list":["post-4602","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-9-fiabilite"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Calcul de fiabilit\u00e9 - Ellistat<\/title>\n<meta name=\"description\" content=\"Calculez le nombre d&#039;unit\u00e9s et la dur\u00e9e d&#039;essai pour d\u00e9montrer une fiabilit\u00e9 ou un MTTF cible, avec les plans Chi2, MTTF et temps de d\u00e9faillance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ellistat.com\/es\/guia-del-usuario\/calcul-de-fiabilite\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Calcul de fiabilit\u00e9 - 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