{"id":302397,"date":"2023-08-21T09:08:19","date_gmt":"2023-08-21T09:08:19","guid":{"rendered":"\/forum\/forums\/reply\/302397\/"},"modified":"2023-08-21T09:08:19","modified_gmt":"2023-08-21T09:08:19","slug":"302397","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/302397\/","title":{"rendered":"Reply To: degrees of freedom"},"content":{"rendered":"<p>&lt;p&gt;I&#8217;m doing a modal analysis on a free-free steel plate in order to extract stiffness matrix, mass matrix and the vectors corresponding to the vibration modes for each natural frequency. in order to reduce the values \u200b\u200bof the matrices so I intend to restrict some degrees of freedom all nodes since the matrix is \u200b\u200bformed by the multiplication between numbers of nodes and the degrees of freedom (in this case they are 6)..&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/17-08-2023-1692303545-mceclip0.png\" 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