{"id":435021,"date":"2025-06-23T00:19:49","date_gmt":"2025-06-23T00:19:49","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-response-understanding-frequency-response-of-directional-deformation\/"},"modified":"2025-06-23T00:21:03","modified_gmt":"2025-06-23T00:21:03","slug":"harmonic-response-understanding-frequency-response-of-directional-deformation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/harmonic-response-understanding-frequency-response-of-directional-deformation\/","title":{"rendered":"Harmonic Response: Understanding Frequency Response of Directional Deformation"},"content":{"rendered":"

<p><p>Hello,<br><br>I am learning Ansys Mechanical. I have been doing a very simple simulation to learn about Harmonic Response MSUP. The geometry is the following:<br><br><br><br>The load is a harmonic torsional moment applied in the X direction:<br><br><br><br>The following surface is fixed:<br><br><br><br>The natural frequencies and modes found in Modal Analysis are:<br><br>1 and 2: 13305 Hz, bending mode<br>3: 22755 Hz, torsion mode<br>4: 34697 Hz, tension-compresion mode<br>5 and 6: 38814 Hz, another bending mode<br><br>The average directional deformation in Y axis of frequency response is the following:<br><br><br><br>The average directional deformation in Z axis of frequency response is the following:<br><br><br><br>The resonance happens at the torsional mode, which makes sense, since I applied a harmonic torsional moment in the X axis. But why is the directional deformation in Z axis about twice the one in the Y axis when there is polar symmetry?<br><br>The direction deformation in Z and Y axis seems to be the same when plotting the distribution in the object:<br><br><br><br><br>What is causing this? The mesh has around 500.000 nodes, which I think is overkill for this simple model, so poor mesh shouldn’t be the problem. Also tried a coarser mesh, same result, so fine mesh isn’t the problem neither.<br><br>Thanks.<br><br>Regards,<\/p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-435021","topic","type-topic","status-publish","hentry","topic-tag-mechanicalworkbench-1","topic-tag-ansys-mechanical","topic-tag-harmonic-forced-response-1","topic-tag-mechanical","topic-tag-modal-harmonic-response"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["435021"],"_bbp_subscription":["515105","20905"],"_bbp_author_ip":["138.100.147.180"],"_bbp_last_reply_id":["435287"],"_bbp_last_active_id":["435287"],"_bbp_last_active_time":["2025-06-24 15:51:38"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["515105","20905"],"_btv_view_count":["482"],"_bbp_topic_status":["unanswered"],"_edit_last":["515105"],"_bbp_revision_log":["a:1:{i:435022;a:2:{s:6:\"author\";i:515105;s:6:\"reason\";s:4:\"typo\";}}"],"_edit_lock":["1750638215:515105"],"_bbp_notification_enabled":["480261"]},"test":"cunyi-jialumnos-upm-es"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/435021","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/435021\/revisions"}],"predecessor-version":[{"id":435022,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/435021\/revisions\/435022"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=435021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}