{"id":390449,"date":"2024-10-18T16:19:33","date_gmt":"2024-10-18T16:19:33","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/generation-of-constraint-equation-issues\/"},"modified":"2024-10-21T13:13:17","modified_gmt":"2024-10-21T13:13:17","slug":"generation-of-constraint-equation-issues","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/generation-of-constraint-equation-issues\/","title":{"rendered":"Generation of constraint equation issues"},"content":{"rendered":"

<p><p>Hello, <\/p><p>My name is ReddyRamu, I have a problem regarding substructure generation. I´m a student writing a master’s thesis on a journal (EHD) bearings using AVL EXCITE M. For this I need to prepare a substructure file which could be later imported to AVL EXCITE. I could generate an EXB file for bearing wall without any issues. But, for bearing pin\/<span style=”font-size: 14pt;”>journal there is an issue. I could generate the EXB file but with some warnings. I think this is because I defined the interface points of the bearing pin wi<\/span><span style=”font-size: 14pt;”>th MASS21 elements with negligible inertias as recommended. <\/span><\/p><p>After meshing I had to define some interface points (master nodes) in the center of the journal. These interface nodes should be defined with MASS21 elements with KEYOPT(3)=0, negligible mass, and rotational inertias. \"\"<\/p><p>Later I need to generate constraint equation CE\/CERIG to connect these interface nodes to the surrounding slave nodes.<span style=”font-size: 14pt;”> I did all this in Me<\/span><span style=”font-size: 14pt;”>chanicl APDL <\/span>\"\"\"\"<\/p><p><span style=”font-size: 14pt;”>and later imported it to the workbench to generate an <\/span><span style=”font-size: 14pt;”>EXB file using the APDL command.  but When I imported the CDB file (APDL) to Workbench, there was an<\/span><span style=”font-size: 14pt;”> undefined component point mass<\/code>.\"\" <\/span><\/p><p><span style=”font-size: 14pt;”>I wasn´t sure how to fix it so I just suppressed it and ran the script. It created an EXB file but, when I imp<\/span><span style=”font-size: 14pt;”>orted the EXB file in EXCITE, I was missing all the rotational DOFs at interface points. as you can see all this in the below pictures.<\/span><\/p><p><span style=”font-size: 14pt;”>\"\"<\/span><\/p><p>If possible could anyone help me to define the CEs between center and slave nodes correctly?<\/p><p> <\/p><p>Thank you!<\/p><p>Reddyramu Gundlooru<\/p><div> <\/div><\/p><\/p>\n","protected":false},"template":"","class_list":["post-390449","topic","type-topic","status-publish","hentry","topic-tag-dof-contraints-1","topic-tag-substructuring-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t