{"id":45188,"date":"2020-06-17T08:31:42","date_gmt":"2020-06-17T08:31:42","guid":{"rendered":"\/forum\/forums\/topic\/lumped-mass-matrix-export\/"},"modified":"2020-06-17T08:31:42","modified_gmt":"2020-06-17T08:31:42","slug":"lumped-mass-matrix-export","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lumped-mass-matrix-export\/","title":{"rendered":"Lumped Mass Matrix export"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>In a modal analysis I want to create a lumped mass matrix for a cube and the corresponding stiffness matrix. The cube should initially only have nodes at the corners.&nbsp;<\/p>\n<p><\/p>\n<p>My APDL command is:<\/p>\n<p><\/p>\n<p>\/aux2&nbsp;<\/p>\n<p><\/p>\n<p>file,file,full&nbsp;<\/p>\n<p><\/p>\n<p>LUMPM,on,&#8211;,0<\/p>\n<p><\/p>\n<p>hbmat,massenmatrix,txt,,ascii,mass,no,yes&nbsp;<\/p>\n<p><\/p>\n<p>hbmat,steifigkeitsmatrix,txt,,ascii,stiff,no,yes&nbsp;<\/p>\n<p><\/p>\n<p>finish<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Unfortunately I get 108 mass entries with 8 nodes, which is a consistent mass matrix, but should only get 24 entries (8 nodes x 3 degrees of freedom per node)&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>I&#8217;m hoping someone can help me.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Regards<\/p>\n<p><\/p>\n<p>Zemos<\/p>\n","protected":false},"template":"","class_list":["post-45188","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["17369"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["3303"],"_bbp_subscription":["246686"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["45188"],"_bbp_forum_id":["27791"],"_bbp_engagement":["22","172395"],"_bbp_voice_count":["2"],"_bbp_reply_count":["18"],"_bbp_last_reply_id":["118821"],"_bbp_last_active_id":["118821"],"_bbp_last_active_time":["2020-06-24 17:18:56"]},"test":"zemos"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45188","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45188\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=45188"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}