{"id":68013,"date":"2021-02-15T10:34:29","date_gmt":"2021-02-15T15:34:29","guid":{"rendered":"https:\/\/mayahtt.com\/?p=68013"},"modified":"2021-03-09T09:20:13","modified_gmt":"2021-03-09T14:20:13","slug":"essais-de-systemes-bases-sur-des-modeles-dengin-spatial-correlation-des-essais-et-des-simulations","status":"publish","type":"post","link":"https:\/\/www.mayahtt.com\/fr\/blog\/essais-de-systemes-bases-sur-des-modeles-dengin-spatial-correlation-des-essais-et-des-simulations\/","title":{"rendered":"Essais de syst\u00e8mes bas\u00e9s sur des mod\u00e8les d\u2019engin spatial \u2014 corr\u00e9lation des essais et des simulations"},"content":{"rendered":"<p>En 2019, la <strong>Mission Constellation Radarsat (MCR) <\/strong>a r\u00e9ussi le lancement en orbite de trois satellites. Ces satellites ont d\u00e9montr\u00e9 les avantages d\u2019une \u00e9troite coordination des simulations et des essais pour les syst\u00e8mes spatiaux complexes.<\/p>\n<p>Sur la base de l\u2019exemple du satellite Falcon 9, <strong>l\u2019article<\/strong> pr\u00e9sent\u00e9 \u00e0 <strong>IMAC XXXIX<\/strong> montre comment les simulations modales sont utilis\u00e9es pour pr\u00e9parer les essais et comment les simulations peuvent rendre les essais plus efficaces et plus r\u00e9alistes. Les corr\u00e9lations entre les essais et les simulations doivent composer avec quatre grandes difficult\u00e9s\u00a0:<\/p>\n<ul>\n<li>Comment \u00eatre s\u00fbr de la pr\u00e9cision du mod\u00e8le d\u2019analyse?<\/li>\n<li>Comment prescrire un essai \u00e0 moindre co\u00fbt?<\/li>\n<li>Comment comparer le mod\u00e8le \u00e0 \u00e9l\u00e9ments finis (MEF) et les essais, qualitativement et quantitativement<\/li>\n<li>Comment mettre \u00e0 jour le MEF pour qu\u2019il corresponde \u00e0 la r\u00e9alit\u00e9?<\/li>\n<\/ul>\n<h3>\u00c0 quel point un mod\u00e8le \u00e0 \u00e9l\u00e9ments finis d\u2019un engin spatial repr\u00e9sente-t-il la r\u00e9alit\u00e9?<\/h3>\n<p>Une m\u00e9thode pour le d\u00e9terminer est d\u2019effectuer des essais modaux et de comparer ou corr\u00e9ler, les r\u00e9sultats des essais et des simulations.<\/p>\n<p>Ceci est particuli\u00e8rement important dans le secteur a\u00e9rospatial, puisque les charges de lancement sont calcul\u00e9es \u00e0 partir de mod\u00e8les valid\u00e9s des fus\u00e9es de lancement et de l\u2019engin spatial. Un mod\u00e8le imparfait signifie des charges ind\u00e9termin\u00e9es et des risques accrus pour le programme.<\/p>\n<p>Avant d\u2019effectuer un essai modal, les exigences et les modes requis doivent \u00eatre clairement d\u00e9finis. Combien faut-il de d\u00e9tecteurs et d\u2019allumeurs? O\u00f9 sont-ils situ\u00e9s et dans quels sens sont-ils orient\u00e9s? Pour que les ing\u00e9nieurs charg\u00e9s des essais visualisent les formes en mode d\u2019essai, un mod\u00e8le \u00e0 maillage filaire doit relier les n\u0153uds de d\u00e9tecteurs et d\u2019allumeurs. Finalement, il faut \u00e9tudier la configuration et les conditions aux limites de l\u2019objet des essais.<\/p>\n<h4>Qu\u2019arrive-t-il lorsque les r\u00e9sultats des essais ne correspondent pas aux simulations?<\/h4>\n<p>Les fonctions de r\u00e9action de fr\u00e9quence (FRF) et les formes modales des essais et simulations sont compar\u00e9es \u00e0 l\u2019aide d\u2019outils quantitatifs et qualitatifs (MAC, MODMAC et orthogonalit\u00e9). D\u00e8s que la corr\u00e9lation \u00e9tablit des diff\u00e9rences entre les deux repr\u00e9sentations, le mod\u00e8le \u00e0 \u00e9l\u00e9ments finis doit \u00eatre actualis\u00e9 pour repr\u00e9senter la r\u00e9alit\u00e9 avec plus d\u2019exactitude.<\/p>\n<p>L\u2019actualisation du mod\u00e8le \u00e0 \u00e9l\u00e9ments finis repose sur un optimiseur, qui peut traiter de grandes quantit\u00e9s de variables (propri\u00e9t\u00e9s physiques et mat\u00e9rielles). Cependant, dans le cas des satellites MCR, l\u2019actualisation est compliqu\u00e9e par les conditions \u00e0 la limite des essais, dans lesquelles l\u2019engin sp\u00e9cial a \u00e9t\u00e9 boulonn\u00e9 \u00e0 un plancher de b\u00e9ton. Nous avons cherch\u00e9 \u00e0 tenir compte de la flexibilit\u00e9 de la plaque d\u2019interface et de l\u2019effet du plancher et du sol sous-jacent dans la proc\u00e9dure d\u2019actualisation.<\/p>\n<p>Des analyses multidisciplinaires sont ensuite effectu\u00e9es sur le mod\u00e8le \u00e0 \u00e9l\u00e9ments finis actualis\u00e9 pour valider la conception en fonction des conditions sp\u00e9cifiques de charge (acoustique, vibroacoustique, dynamique, etc.).<\/p>\n<p>Pour en savoir plus sur les difficult\u00e9s des interactions modales entre les simulations et les essais pour la simulation de syst\u00e8mes spatiaux et comment un processus compl\u00e8tement int\u00e9gr\u00e9 peut r\u00e9duire les boucles d\u2019it\u00e9rations et de conception afin d\u2019am\u00e9liorer les interactions des simulations et des essais, <strong><a href=\"https:\/\/mayahtt.com\/fr\/about-maya-htt\/contact\/\" target=\"_blank\" rel=\"noopener\">consultez un expert de Maya HTT<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Satellites Mission Constellation RADARSAT (MCR) : Essais de syst\u00e8mes bas\u00e9s sur des mod\u00e8les d\u2019engin spatial et corr\u00e9lation des essais et des simulations pour des syst\u00e8mes spatiaux complexes<\/p>\n","protected":false},"author":1,"featured_media":68011,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[302,560,559,303],"tags":[],"class_list":["post-68013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-articles-fr-2","category-articles-fr-fr","category-blogue"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Essais de syst\u00e8mes bas\u00e9s sur des mod\u00e8les 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