{"id":407082,"date":"2025-01-26T22:41:50","date_gmt":"2025-01-26T22:41:50","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/eigenfrequencies-issues-for-constraint-equations-and-substructuring-rbe3\/"},"modified":"2025-01-27T11:40:51","modified_gmt":"2025-01-27T11:40:51","slug":"eigenfrequencies-issues-for-constraint-equations-and-substructuring-rbe3","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/eigenfrequencies-issues-for-constraint-equations-and-substructuring-rbe3\/","title":{"rendered":"Eigenfrequencies issues for Constraint equations and substructuring RBE3"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello,&nbsp;&lt;\/p&gt;&lt;p&gt;I&acute;m having trouble generating the substructuring. I used the RBE3 command to define a rigid region center node to surrounding slave nodes for a rotating shaft. for interface points(master nodes) i used MASS21 with negligible mass and inertias.&nbsp; But when i imported my model from APDL to workbench and ran substructuring analysis, I got an unknown error as you can see in the image 3. If possible, Could anyone help me with the issue?&lt;\/p&gt;&lt;p&gt;&nbsp;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/26-01-2025-1737930849-Screenshot (52).png\" alt=\"\" width=\"664\" height=\"374\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/26-01-2025-1737930941-Screenshot (53).png\" alt=\"\" width=\"662\" height=\"372\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/26-01-2025-1737931234-Screenshot (55).png\" alt=\"\" width=\"857\" height=\"482\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thank you and best regards&lt;\/p&gt;&lt;p&gt;Reddyramu Gundlooru&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-407082","topic","type-topic","status-publish","hentry","topic-tag-apdl","topic-tag-mechanical","topic-tag-pivot-error-2","topic-tag-point-mass-1","topic-tag-rigid-2","topic-tag-rotating-shaft-1","topic-tag-substructuring-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["407082"],"_bbp_author_ip":["2a02:2455:722:9300:f430:76eb:c5e:7198"],"_bbp_last_reply_id":["407150"],"_bbp_last_active_id":["407150"],"_bbp_last_active_time":["2025-01-27 11:32:33"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["465704","58821"],"_btv_view_count":["299"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["465704"],"_bbp_subscription":["58821","465704"],"_edit_last":["52629"],"_bbp_revision_log":["a:1:{i:407158;a:2:{s:6:\"author\";i:52629;s:6:\"reason\";s:0:\"\";}}"]},"test":"reddyramu-gundloorustud-hs-flensburg-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/407082","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\/407082\/revisions"}],"predecessor-version":[{"id":407158,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/407082\/revisions\/407158"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=407082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}