{"id":34143,"date":"2026-09-03T14:23:09","date_gmt":"2026-09-03T12:23:09","guid":{"rendered":"https:\/\/cedrat-technologies.com\/?post_type=product&#038;p=34143"},"modified":"2026-09-03T14:38:38","modified_gmt":"2026-09-03T12:38:38","slug":"mecanisme-de-pointage-dantenne-a-fort-gain-a-actionnement-piezoelectrique-pour-la-mission-lisa","status":"publish","type":"product","link":"https:\/\/cedrat-technologies.com\/fr\/produit\/mecanisme-de-pointage-dantenne-a-fort-gain-a-actionnement-piezoelectrique-pour-la-mission-lisa\/","title":{"rendered":"M\u00e9canisme de pointage d\u2019antenne \u00e0 fort gain \u00e0 actionnement pi\u00e9zo\u00e9lectrique pour la mission LISA"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p class=\"isSelectedEnd\">Cet article pr\u00e9sente la conception, la caract\u00e9risation exp\u00e9rimentale des microvibrations, la corr\u00e9lation du mod\u00e8le et la pr\u00e9diction des perturbations au niveau de l\u2019antenne du m\u00e9canisme de pointage d\u2019antenne \u00e0 fort gain destin\u00e9 \u00e0 la mission <strong>Laser Interferometer Space Antenna (LISA)<\/strong>.<\/p>\n<p class=\"isSelectedEnd\">Le m\u00e9canisme propos\u00e9 repose sur deux moteurs pi\u00e9zo\u00e9lectriques de type <strong>inchworm<\/strong>, dispos\u00e9s selon une configuration <strong>\u00e9l\u00e9vation-sur-azimut<\/strong>. L\u2019actionnement pi\u00e9zo\u00e9lectrique a \u00e9t\u00e9 retenu afin de r\u00e9pondre aux exigences particuli\u00e8rement strictes de la mission LISA en mati\u00e8re de <strong>faibles microvibrations transmises \u00e0 la structure, de tr\u00e8s faible vitesse de fonctionnement et de compatibilit\u00e9 magn\u00e9tique<\/strong>.<\/p>\n<p class=\"isSelectedEnd\">Un prototype repr\u00e9sentatif d\u2019un \u00e9tage d\u2019actionnement a \u00e9t\u00e9 con\u00e7u, fabriqu\u00e9 et test\u00e9. Les forces et moments transmis ont \u00e9t\u00e9 mesur\u00e9s selon les <strong>six degr\u00e9s de libert\u00e9<\/strong> au cours d\u2019une campagne d\u00e9di\u00e9e de caract\u00e9risation des microvibrations.<\/p>\n<p class=\"isSelectedEnd\">Les r\u00e9sultats exp\u00e9rimentaux ont ensuite \u00e9t\u00e9 utilis\u00e9s pour corr\u00e9ler un mod\u00e8le par \u00e9l\u00e9ments finis destin\u00e9 \u00e0 effectuer des pr\u00e9dictions \u00e0 l\u2019\u00e9chelle de l\u2019antenne. Comme le m\u00e9canisme inchworm complet n\u2019est pas strictement <strong>lin\u00e9aire et invariant dans le temps<\/strong>, la corr\u00e9lation a \u00e9t\u00e9 r\u00e9alis\u00e9e \u00e0 l\u2019aide d\u2019une repr\u00e9sentation lin\u00e9aire \u00e9quivalente locale de la principale source de perturbations, \u00e0 savoir <strong>le rel\u00e2chement des brides sous charge lors de la s\u00e9quence de d\u00e9placement pas \u00e0 pas<\/strong>.<\/p>\n<p class=\"isSelectedEnd\">Les r\u00e9sultats montrent une tr\u00e8s bonne concordance dans le degr\u00e9 de libert\u00e9 d\u2019actionnement, avec une <strong>erreur relative inf\u00e9rieure \u00e0 8 % sur le couple RMS transmis<\/strong>, qui constitue la principale composante des perturbations, ainsi qu\u2019une concordance satisfaisante dans les directions coupl\u00e9es.<\/p>\n<p>Le mod\u00e8le corr\u00e9l\u00e9 a ensuite \u00e9t\u00e9 utilis\u00e9 pour estimer les performances en mati\u00e8re de microvibrations transmises de l\u2019antenne compl\u00e8te, en \u00e9valuant ind\u00e9pendamment les \u00e9tages d\u2019entra\u00eenement en <strong>azimut et en \u00e9l\u00e9vation<\/strong>, et en d\u00e9montrant leur <strong>compatibilit\u00e9 avec les exigences de la mission<\/strong>.<\/p>\n","protected":false},"featured_media":30608,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":""},"product_brand":[],"product_cat":[1413,1391,1392,1519,1404,1464,2390],"product_tag":[],"class_list":{"0":"post-34143","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-controle-actif-de-vibration","7":"product_cat-degres-de-libertes-multiples","8":"product_cat-fsm-plateformes-tip-tilt","9":"product_cat-moteurs-piezo-actionneurs-lineaires-publications-fr","10":"product_cat-pilotage-controle","11":"product_cat-publications-fr","12":"product_cat-space-fr","14":"first","15":"instock","16":"downloadable","17":"shipping-taxable","18":"purchasable","19":"product-type-simple"},"acf":[],"_links":{"self":[{"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product\/34143","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/comments?post=34143"}],"version-history":[{"count":1,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product\/34143\/revisions"}],"predecessor-version":[{"id":34148,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product\/34143\/revisions\/34148"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/media\/30608"}],"wp:attachment":[{"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/media?parent=34143"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product_brand?post=34143"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product_cat?post=34143"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/cedrat-technologies.com\/fr\/wp-json\/wp\/v2\/product_tag?post=34143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}