{"id":359831,"date":"2024-04-01T14:38:19","date_gmt":"2024-04-01T14:38:19","guid":{"rendered":"\/forum\/forums\/reply\/359831\/"},"modified":"2024-04-01T14:38:19","modified_gmt":"2024-04-01T14:38:19","slug":"359831","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/359831\/","title":{"rendered":"Reply To: Probem with modal Analysis"},"content":{"rendered":"<p>&lt;p&gt;Make sure all your elements are connected &#8211; for a large ship frequencies of global modes (say 1st bending mode) should be below the local panel modes.&lt;\/p&gt;&lt;p&gt;Acoustic elements are way to complicated and comp. intensive for a global analysis of ships (vibration).&lt;\/p&gt;&lt;p&gt;There used to be a Guyan reduction to do as you mentioned, but since the mass (matrix &#8211; depends of choice of masters which is tricky) is approximate I do not think it is supported anymore.&lt;\/p&gt;&lt;p&gt;All the best&lt;\/p&gt;&lt;p&gt;Erik&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-359831","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/359831","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/359831\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=359831"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}