{"id":362871,"date":"2024-04-18T08:02:05","date_gmt":"2024-04-18T08:02:05","guid":{"rendered":"\/forum\/forums\/topic\/is-node-order-in-the-stiffness-matrix-different-from-the-node-order-in-solution\/"},"modified":"2024-04-18T08:02:05","modified_gmt":"2024-04-18T08:02:05","slug":"is-node-order-in-the-stiffness-matrix-different-from-the-node-order-in-solution","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-node-order-in-the-stiffness-matrix-different-from-the-node-order-in-solution\/","title":{"rendered":"Is node order in the stiffness matrix different from the node order in solution?"},"content":{"rendered":"<p>I performed a modal analysis and used APDL SMAT to extract the stiffness matrix. Then, in MATLAB, I applied a force to&nbsp; just one node, but the results are significantly different from what I obtained from a static analysis. In ANSYS, excluding the fixed points, deformation occurred at all nodes. However, when performed in MATLAB, more than half of the nodes showed zero deformation. I used the governing equation F=Kx. 2Why might this be happening?<\/p>\n<p>Size of stiffness matrix is number of nodes*3 (X, Y, and Z directions). So, does this mean the order is node1x, 1y, 1z, &#8230; nx, ny, nz? The analysis was conducted with default settings.&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-362871","topic","type-topic","status-closed","hentry","topic-tag-apdl","topic-tag-matlab","topic-tag-stiffness-matrix"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["80516","18229"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["697"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["362871"],"_bbp_forum_id":["27791"],"_bbp_engagement":["18229","80516"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["364386"],"_bbp_last_active_id":["364386"],"_bbp_last_active_time":["2024-04-26 11:52:38"]},"test":"dhjang4522gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/362871","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\/362871\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=362871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}