{"id":6076,"date":"2011-04-12T22:04:21","date_gmt":"2011-04-12T20:04:21","guid":{"rendered":"https:\/\/medianbox.fr\/wordpress\/?p=6076"},"modified":"2014-08-13T19:05:56","modified_gmt":"2014-08-13T17:05:56","slug":"mediansports-indice-median","status":"publish","type":"post","link":"https:\/\/medianbox.fr\/wordpress\/?p=6076","title":{"rendered":"MeDiaN@Sports – \u00ab L’Indice de difficult\u00e9e \u00e0 v\u00e9lo \u00bb"},"content":{"rendered":"

Pr\u00e9sentation g\u00e9n\u00e9rale<\/h3>\n

Dans ce pr\u00e9c\u00e9dent article<\/a>, nous avons vu que calculer l’\u00e9nergie consomm\u00e9e par le cycliste lors d’un parcours est int\u00e9ressant pour r\u00e9aliser un classement des diff\u00e9rentes sorties puisqu’il permet de faire intervenir simultan\u00e9ment :
\n– La notion de distance parcourue ;
\n– La notion de topographie du parcours ;
\n– La notion de vitesse et les perte a\u00e9rodynamiques associ\u00e9es ;
\n– Les propri\u00e9t\u00e9s intrins\u00e8ques du syst\u00e8me Cycliste\/V\u00e9lo : Frottements d’une part, masses et donc inertie d’autre part ;
\n– Les propri\u00e9t\u00e9s extrins\u00e8que au syst\u00e8me Cycliste\/V\u00e9lo : R\u00e9sistance au roulement.
\n– La dur\u00e9e de l\u2019effort.<\/p>\n

Les limites<\/h3>\n

Ce mod\u00e8le de calcul reste cependant beaucoup trop simpliste pour que les valeurs obtenues puissent \u00eatre consid\u00e9r\u00e9es comme repr\u00e9sentative de la r\u00e9alit\u00e9 (car nombreuses hypoth\u00e8ses simplificatrice) :
\n– Parcours \u00e0 vitesse&cadence constante ;
\n– Vitesse&direction du vent arbitraire et mod\u00e9lisation sommaire de l’influence de l’aspiration.
\n– Hypoth\u00e8ses sur les param\u00e8tres de la r\u00e9sistance au roulement, sur les param\u00e8tres m\u00e9t\u00e9orologique, sur ceux du v\u00e9lo (frottements),…
\n– …<\/p>\n

Conclusion<\/h3>\n

Bien qu’approximatif, ce mod\u00e8le de calcul n’en est pas moins comparatif. Un indice de difficult\u00e9 pourra ainsi \u00eatre d\u00e9termin\u00e9 pour chaque sortie afin de comparer cette sortie \u00e0 un parcours de r\u00e9f\u00e9rence (parcours ayant mobilis\u00e9 le plus d’\u00e9nergie).<\/p>\n

Cette indice pourra \u00eatre utilis\u00e9 pour caract\u00e9riser une sortie de mani\u00e8re beaucoup plus pr\u00e9cise qu\u2019un classement selon les seuls crit\u00e8res de distance, d\u00e9nivel\u00e9, vitesse ou dur\u00e9e du parcours. Il sera obtenu \u00e0 partir de la relation suivante :<\/p>\n

\n

\u00a0I_{MeDiaN} = 100.\\frac{E_{m_{fournie}}}{E_{max}}<\/p>\n

Ou E_{m_{fournie}} est l’\u00e9nergie m\u00e9canique fournie lors de la sortie
\nEt E_{max} est l’\u00e9nergie de r\u00e9f\u00e9rence, c’est \u00e0 dire la sortie durant laquelle l’\u00e9nergie fournie a \u00e9t\u00e9 maximum.<\/p>\n<\/blockquote>\n

Le d\u00e9tail du calcul de E_{m_{fournie}} est expliqu\u00e9 dans la s\u00e9rie d’articles publi\u00e9e ci-dessous.<\/p>\n

1. MeDiaN@Sports – \u00ab L\u2019\u00c9nergie cin\u00e9tique \u00e0 v\u00e9lo \u00bb (voir<\/a>)
\n2. MeDiaN@Sports – \u00ab L\u2019\u00c9quation de mouvement \u00e0 v\u00e9lo \u00bb (voir<\/a>)
\n3. MeDiaN@Sports – \u00ab L’A\u00e9rodynamisme \u00e0 v\u00e9lo \u00bb (voir<\/a>)
\n4. MeDiaN@Sports – \u00ab La R\u00e9sistance au Roulement \u00e0 v\u00e9lo \u00bb (voir<\/a>)
\n5. MeDiaN@Sports – \u00ab Les Frottements \u00e0 v\u00e9lo \u00bb (voir<\/a>)
\n6. MeDiaN@Sports – \u00ab Puissance et Energie \u00e0 v\u00e9lo \u00bb (voir<\/a>)<\/p>\n

<\/h3>\n","protected":false},"excerpt":{"rendered":"

Pr\u00e9sentation g\u00e9n\u00e9rale Dans ce pr\u00e9c\u00e9dent article, nous avons vu que calculer l’\u00e9nergie consomm\u00e9e par le cycliste lors d’un parcours est int\u00e9ressant pour r\u00e9aliser un classement des diff\u00e9rentes sorties puisqu’il permet de faire intervenir simultan\u00e9ment : – La notion de distance parcourue ; – La notion de topographie du parcours ; – La notion de vitesse […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"ngg_post_thumbnail":0,"footnotes":""},"categories":[60],"tags":[],"class_list":["post-6076","post","type-post","status-publish","format-standard","hentry","category-mediansports"],"yoast_head":"\nMeDiaN@Sports - \u00ab L'Indice de difficult\u00e9e \u00e0 v\u00e9lo \u00bb - MeDiaN@Tour<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/medianbox.fr\/wordpress\/?p=6076\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MeDiaN@Sports - \u00ab L'Indice de difficult\u00e9e \u00e0 v\u00e9lo \u00bb - MeDiaN@Tour\" \/>\n<meta property=\"og:description\" content=\"Pr\u00e9sentation g\u00e9n\u00e9rale Dans ce pr\u00e9c\u00e9dent article, nous avons vu que calculer l’\u00e9nergie consomm\u00e9e par le cycliste lors d’un parcours est int\u00e9ressant pour r\u00e9aliser un classement des diff\u00e9rentes sorties puisqu’il permet de faire intervenir simultan\u00e9ment : – La notion de distance parcourue ; 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