{"id":390927,"date":"2024-10-22T20:44:37","date_gmt":"2024-10-22T20:44:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390927\/"},"modified":"2024-10-22T20:44:37","modified_gmt":"2024-10-22T20:44:37","slug":"390927","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390927\/","title":{"rendered":"Reply To: Generation of constraint equation issues"},"content":{"rendered":"<p>&lt;p&gt;By giving the mass21 a small rotational inertia in all directions, the master node will have all 6 dof.&nbsp; Then CERIG,master node, all,all should write constraint equations for all the selected nodes in terms of the master node ux, uy, uz, rotx, roty, rotz.&nbsp; You should confirm this before leaving APDL with celist.&nbsp; Because the master node dof are retained they can all be used as the master dof of a superelement.&nbsp; I don&#8217;t know what the error message means, but you could avoid the issue by defining the mass in Mechanical use the Rigid behavior.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390927","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"By giving the mass21 a small rotational inertia in all directions, the master node will have all 6 dof. Then CERIG,master node, all,all should write constraint equations for all the selected nodes in terms of the master node ux, uy, uz, rotx, roty, rotz. You should confirm this before leaving APDL with celist. Because the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390927\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Generation of constraint equation issues | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"By giving the mass21 a small rotational inertia in all directions, the master node will have all 6 dof. Then CERIG,master node, all,all should write constraint equations for all the selected nodes in terms of the master node ux, uy, uz, rotx, roty, rotz. You should confirm this before leaving APDL with celist. Because the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/390927\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-22T20:44:37+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-22T20:44:37+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Generation of constraint equation issues | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"By giving the mass21 a small rotational inertia in all directions, the master node will have all 6 dof. Then CERIG,master node, all,all should write constraint equations for all the selected nodes in terms of the master node ux, uy, uz, rotx, roty, rotz. You should confirm this before leaving APDL with celist. 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