{"id":78513,"date":"2022-07-20T17:58:51","date_gmt":"2022-07-20T15:58:51","guid":{"rendered":"https:\/\/ivmtech.it\/?page_id=78513"},"modified":"2022-10-26T10:29:07","modified_gmt":"2022-10-26T08:29:07","slug":"monitoraggio-accurato-manutenzione","status":"publish","type":"page","link":"https:\/\/ivmtech.it\/fr\/pillole-tecniche\/monitoraggio-accurato-manutenzione\/","title":{"rendered":"Une surveillance pr\u00e9cise"},"content":{"rendered":"<p>[vc_row][vc_column][vc_text_separator title=&#8221;L&#8217;importance de la mesure statique de la r\u00e9partition des forces verticales \u00e0 la roue \u00e0 des fins de maintenance&#8221; color=&#8221;custom&#8221; border_width=&#8221;2&#8243; accent_color=&#8221;#ffd200&#8243; el_class=&#8221;sticky&#8221;][vc_empty_space height=&#8221;20px&#8221;][vc_column_text css_animation=&#8221;left-to-right&#8221;]Par surveillance d&#8217;un syst\u00e8me \u00e9volutif, on entend le contr\u00f4le de la performance d&#8217;une ou plusieurs grandeurs qui peuvent varier dans le temps. Dans le domaine technico-scientifique, les objectifs de la surveillance peuvent \u00eatre diff\u00e9rents et divis\u00e9s en :<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Analyse des ph\u00e9nom\u00e8nes physiques associ\u00e9s au syst\u00e8me afin d&#8217;identifier la r\u00e9gulation pouvant les d\u00e9crire;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identification des causes ayant d\u00e9termin\u00e9 des situations particuli\u00e8res du syst\u00e8me et identification des actions correctives possibles.<\/span><\/li>\n<\/ul>\n<p>Dans ce second cas, l&#8217;objectif diagnostique est typiquement fonctionnel ou pr\u00e9paratoire aux interventions de maintenance. Dans le domaine ferroviaire, le syst\u00e8me est constitu\u00e9 d&#8217;un bogie reposant sur la voie et on souhaite contr\u00f4ler la r\u00e9partition de la charge exerc\u00e9e par les roues sur le rail.<\/p>\n<p>Cela conduit \u00e0 identifier les conditions dans lesquelles la distribution s&#8217;\u00e9carte des valeurs de conception et\/ou r\u00e9glementaires et, par cons\u00e9quent, une intervention est n\u00e9cessaire. En m\u00eame temps, cela signifie identifier les causes possibles qui ont g\u00e9n\u00e9r\u00e9 les conditions susmentionn\u00e9es. Parmi ceux-ci, par exemple, il peut y avoir une d\u00e9gradation de la rigidit\u00e9 des suspensions et\/ou de la g\u00e9om\u00e9trie du ch\u00e2ssis.<\/p>\n<p>Pour \u00e9tudier le ph\u00e9nom\u00e8ne physique de d\u00e9gradation \u00e9galement avec des outils statistiques afin d&#8217;identifier les normes et les param\u00e8tres qui l&#8217;influencent, la surveillance doit mesurer les param\u00e8tres choisis avec une <strong>pr\u00e9cision<\/strong> et une <strong>fr\u00e9quence temporelle<\/strong> ad\u00e9quates pour d\u00e9crire l&#8217;\u00e9volution et identifier \u00e0 temps une d\u00e9gradation n\u00e9cessitant une intervention de maintenance urgente.<\/p>\n<p>L&#8217;histogramme suivant montre les r\u00e9sultats d&#8217;une surveillance effectu\u00e9e sur un certain nombre de voitures ferroviaires \u00e0 deux bogies en termes de d\u00e9s\u00e9quilibre des essieux associ\u00e9s.<img loading=\"lazy\" class=\"aligncenter wp-image-78515 size-full\" src=\"https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1.png\" alt=\"\" width=\"1545\" height=\"359\" srcset=\"https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1.png 1545w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-300x70.png 300w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-768x178.png 768w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-1536x357.png 1536w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-500x116.png 500w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-800x186.png 800w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img-1-1280x297.png 1280w\" sizes=\"(max-width: 1545px) 100vw, 1545px\" \/><img loading=\"lazy\" class=\"aligncenter wp-image-78516 size-full\" src=\"https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2.png\" alt=\"\" width=\"1543\" height=\"357\" srcset=\"https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2.png 1543w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-300x69.png 300w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-768x178.png 768w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-1536x355.png 1536w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-500x116.png 500w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-800x185.png 800w, https:\/\/ivmtech.it\/wp-content\/uploads\/2022\/07\/pillola-5-img2-1280x296.png 1280w\" sizes=\"(max-width: 1543px) 100vw, 1543px\" \/><\/p>\n<p>Tous les bogies examin\u00e9s pr\u00e9sentent au moins un essieu d\u00e9s\u00e9quilibr\u00e9 de plus de 5% et pr\u00e9sentent en cons\u00e9quence un d\u00e9s\u00e9quilibre des diagonales.<\/p>\n<p>Comme le montre le <strong>Bogie Playground<\/strong>, cette condition est le signe d&#8217;une rigidit\u00e9 non uniforme des suspensions primaires ou d&#8217;un gauche de bogie. Ces deux situations n\u00e9cessitent un entretien.<\/p>\n<p>Ces mesures sont suffisamment pr\u00e9cises pour d\u00e9tecter la pr\u00e9sence du d\u00e9s\u00e9quilibre, mais ne sont pas assez fr\u00e9quentes pour d\u00e9terminer quand ces conditions se sont produites. On sait seulement que ces mesures ont \u00e9t\u00e9 r\u00e9alis\u00e9es dans l&#8217;intervalle entre deux maintenances cycliques successives (2e niveau).<\/p>\n<p>Par cons\u00e9quent, afin de d\u00e9terminer l&#8217;\u00e9volution du ph\u00e9nom\u00e8ne de d\u00e9gradation, il est n\u00e9cessaire de mesurer plusieurs fois pour comprendre quand le ph\u00e9nom\u00e8ne a commenc\u00e9 et surtout s&#8217;il est li\u00e9 \u00e0 un \u00e9v\u00e9nement d\u00e9clencheur. Ces informations pourraient \u00eatre tr\u00e8s utiles aussi bien pour am\u00e9liorer la maintenance que pour r\u00e9duire les causes.<\/p>\n<p>Cependant, nous devons introduire un autre facteur qui peut affecter notre surveillance et qui peut se r\u00e9sumer \u00e0 la <em>complexit\u00e9 de r\u00e9alisation de la mesure<\/em>, associ\u00e9e au co\u00fbt et au temps.<\/p>\n<p>De ce point de vue, POWERVE\u00ae repr\u00e9sente un point de rupture puisqu&#8217;il permet de r\u00e9duire les co\u00fbts et les d\u00e9lais.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_text_separator title=&#8221;L&#8217;importance de la mesure statique de la r\u00e9partition des forces verticales \u00e0 la roue \u00e0 des fins de maintenance&#8221; [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":78476,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.9 - 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