{"id":235295,"date":"2022-09-15T06:47:20","date_gmt":"2022-09-15T06:47:20","guid":{"rendered":"\/forum\/forums\/topic\/verification-of-repeated-eigenfrequencies\/"},"modified":"2022-09-15T06:47:20","modified_gmt":"2022-09-15T06:47:20","slug":"verification-of-repeated-eigenfrequencies","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/verification-of-repeated-eigenfrequencies\/","title":{"rendered":"Verification of repeated eigenfrequencies"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I have a complex truss structure that has the following natural frequencies. Some of them are multiples and some are very close to the multiples. How can I verify mathematically that I really have repeated eigenfrequencies and not some frequencies that are just close to each other?<\/p>\n<p>13252.43697076<br \/>13253.72670625<br \/>13253.72670625<br \/>13319.90610080<br \/>13319.90610080<br \/>13319.90610080<br \/>15125.04970060<br \/>15125.04970060<br \/>15125.05037702<br \/>17822.02177338<br \/>17822.65139503<br \/>17822.65139503<\/p>\n<p>Is it possible to recognize repeated eigenfrequencies from the values alone? If yes, at which decimal place do numerical errors start to falsify the results?<\/p>\n<p>Thank you for your help!<\/p>\n","protected":false},"template":"","class_list":["post-235295","topic","type-topic","status-closed","hentry","topic-tag-ansys-apdl","topic-tag-Eigenfrequencies-1","topic-tag-natural-frequency","topic-tag-verification"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["182889","240"],"_bbp_author_ip":["23.192.164.21"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["487"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["235295"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","182889"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["235657"],"_bbp_last_active_id":["235657"],"_bbp_last_active_time":["2022-09-19 11:54:27"]},"test":"waldmeisterswein"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/235295","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\/235295\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=235295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}