{"id":390222,"date":"2024-10-17T10:49:09","date_gmt":"2024-10-17T10:49:09","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-substructuring-and-extract-stiffness-matrix\/"},"modified":"2024-10-30T13:42:24","modified_gmt":"2024-10-30T13:42:24","slug":"ansys-substructuring-and-extract-stiffness-matrix","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-substructuring-and-extract-stiffness-matrix\/","title":{"rendered":"ANSYS Substructuring and extract Stiffness Matrix"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;Hello,&nbsp;&lt;\/p&gt;&lt;p&gt;my problem is a bit complicated to explain. I try to sketch my workflow below:&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ol>\n<li>I model a shaft in ANSYS Workbench\/Mechanical and mesh it.<\/li>\n<li>Boundary conditions are defined with the ANSYS option cylindrical bearings. The shaft is free in circumferential direction. Other BC are used to get a fully constrained model. The picture below shows them left and right of the gearing:&lt;br&gt;<\/li>\n<li>After meshing, I create a substructuring model and define some points at the gearing as masterpoints.&nbsp;<\/li>\n<li>Forces are defined at a tooth<\/li>\n<li>The substructured stiffness matrix and the Load vector are extracted via the HB-Format (command HBMAT in an APDL script).<\/li>\n<li>Stiffness Matrix and Load vector are imported in Matlab and the System K*u=f is solved.&nbsp;<\/li>\n<\/ol>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;To test my workflow, I did the calculation in Matlab and ANSYS directly. Results for u should be the same in both cases.&nbsp;&lt;\/p&gt;&lt;p&gt;Now to my problem:&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>For the configuration with the cylindrical bearing boundary condition, the deformation u from Matlab (derived with the load vector and stiffness matrix from Ansys) differs from the deformation calculated with ANSYS directly .<\/li>\n<li>Changing the cylindrical bearing boundary condition to fully constrained boundary condition (u = 0 at the cylindrical surfaces in the picture above), the solution from ANSYS directly and Matlab are the same.<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;So it can be assumend, that in my model with the cylindrical bearing boundary conditions, something is wrong with the exported stiffness matrix. Maybe I have some commands missing?&lt;\/p&gt;&lt;p&gt;It would be nice if someone has done something like this before or has an idea of what to look out for to solve the problem.&lt;\/p&gt;&lt;p&gt;Best,&lt;\/p&gt;&lt;p&gt;Jonas&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390222","topic","type-topic","status-publish","hentry","topic-tag-boundary-condition","topic-tag-cylindricaljoint-1","topic-tag-cylindrical-support","topic-tag-mechanical","topic-tag-stiffness-matrix","topic-tag-substructuring-2"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, my problem is a bit complicated to explain. I try to sketch my workflow below:I model a shaft in ANSYS Workbench\/Mechanical and mesh it.Boundary conditions are defined with the ANSYS option cylindrical bearings. The shaft is free in circumferential direction. Other BC are used to get a fully constrained model. 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