{"id":33167,"date":"2019-02-08T20:09:19","date_gmt":"2019-02-08T20:09:19","guid":{"rendered":"\/forum\/forums\/topic\/double-modes-in-modal-analysis-of-simple-circular-membrane-clamped-in-its-boundary\/"},"modified":"2019-02-08T20:09:19","modified_gmt":"2019-02-08T20:09:19","slug":"double-modes-in-modal-analysis-of-simple-circular-membrane-clamped-in-its-boundary","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/double-modes-in-modal-analysis-of-simple-circular-membrane-clamped-in-its-boundary\/","title":{"rendered":"&#8220;Double&#8221; modes in modal analysis of simple circular membrane clamped in its boundary"},"content":{"rendered":"<p>Hello,&nbsp;<\/p>\n<p><\/p>\n<p>i am trying to find normal modes of simple ideal circular membrane.<br \/>I chose strecutral steel as material, and geoemtry is: diamater is 0,391mm, thickness is 0,0035mm.<\/p>\n<p><\/p>\n<p>However, i got &#8220;double&#8221; modes: every two modes are very very similar &#8211; with the almost same value of frequency.<br \/>i got same answer with other commercial program.&nbsp;<br \/>I tried to chcange mesh, i tried do model my geomtry as solid and also as a shell\/surface but i got the same problem.<\/p>\n<p>see pictures: mode 4 and mode 5 is only ONE mode in reality. Why i got this result?<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/b52b263f-1db2-4f6c-a2d6-a92e014c7143\/49a6093b-46b1-41ad-907d-a9ee014bb99b_a1.jpg?width=690&amp;upscale=false\" alt=\"mode_4\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/b52b263f-1db2-4f6c-a2d6-a92e014c7143\/0ce83eb0-0d9e-4c1b-a5d0-a9ee014be1b4_a2.jpg?width=690&amp;upscale=false\" alt=\"mode_5\"><\/p>\n","protected":false},"template":"","class_list":["post-33167","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["5339"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["729"],"_bbp_subscription":["236794"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["33167"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","158123","253025"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["229081"],"_bbp_last_active_id":["229081"],"_bbp_last_active_time":["2022-04-07 14:23:18"]},"test":"kravky"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/33167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/33167\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=33167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}