{"id":158156,"date":"2022-06-06T09:58:54","date_gmt":"2022-06-06T09:58:54","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/"},"modified":"2022-06-06T10:27:50","modified_gmt":"2022-06-06T10:27:50","slug":"how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/","title":{"rendered":"How can I get the modal contributions to my random vibration (PSD) one sigma values?"},"content":{"rendered":"<p>The square root of the variance can be used as a mode coefficient. The variance can be retrieved using the *GET,,mode,N,mcoef command. See the sample input below. For those commands to work in Mechanical, you need to save the modal results and MAPDL database file (set the &ldquo;Keep Modal Results&rdquo; to Yes under the Analysis Settings and set the &ldquo;Save MAPDL db&rdquo; to Yes).<br \/>resume<br \/>\/post1<br \/>*get,mcoef_3,mode,3,mcoef<br \/>mcoef_3=sqrt(mcoef_3)<br \/>\/post1<br \/>set,1,3,mcoef_3*3 ! contribution of mode 3 to 3 sigma results<br \/>\/show,png<br \/>plns,s,eqv<\/p>\n","protected":false},"template":"","class_list":["post-158156","topic","type-topic","status-publish","hentry","topic-tag-modal","topic-tag-modal-contribution","topic-tag-psd","topic-tag-random-vibration"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["06-06-2022 20:20"],"_bbp_forum_id":["27792"],"_bbp_likes_count":["3"],"_btv_view_count":["1288"],"_edit_lock":["1654511262:1"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/158156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/158156\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=158156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}