{"id":371525,"date":"2024-07-11T20:57:12","date_gmt":"2024-07-11T20:57:12","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-analysis-and-resonance\/"},"modified":"2024-07-11T20:57:12","modified_gmt":"2024-07-11T20:57:12","slug":"harmonic-analysis-and-resonance","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-analysis-and-resonance\/","title":{"rendered":"Harmonic analysis and resonance"},"content":{"rendered":"<p>Harmonic analysis and resonance<\/p>\n<p>Hi all.<br \/>I&#8217;m doing a modal + harmonic calculation for a lamp post.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/11-07-2024-1720731376-mceclip0.png\"><br \/>The column consists of two parts, a vertical 6 meters long from a 500&#215;500 mm pipe, and a horizontal top 2 meters long from a 250&#215;500 pipe, the thickness of the pipe sheet is 6 mm.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/11-07-2024-1720731388-mceclip1.png\"><br \/>In modal analysis, I see that the first modes are below 20Hz, which prompts me to conduct a harmonic analysis with prestress from the modal to check if there are responses at natural frequencies to exclude resonance.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/11-07-2024-1720731396-mceclip2.png\"><br \/>After conducting a harmonic analysis, even at the smallest loads, I always see responses at at least the first two natural frequencies.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/11-07-2024-1720731405-mceclip3.png\"><\/p>\n<p>I believe that the resonance is confirmed. <strong>Is my reasoning correct?<\/strong> Moreover, if we carry out a dynamic analysis of the structure, it will withstand with a large margin.<\/p>\n","protected":false},"template":"","class_list":["post-371525","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["257647","20905"],"_bbp_author_ip":["50.7.93.28"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["165"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["257647","257647","257647","257647","257647","257647","257647","257647"],"_bbp_topic_id":["371525"],"_bbp_forum_id":["27791"],"_bbp_engagement":["20905","257647"],"_bbp_voice_count":["2"],"_bbp_reply_count":["15"],"_bbp_last_reply_id":["372632"],"_bbp_last_active_id":["372632"],"_bbp_last_active_time":["2024-07-18 17:43:26"]},"test":"javat33489gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/371525","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\/371525\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=371525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}