{"id":158154,"date":"2022-06-06T09:58:49","date_gmt":"2022-06-06T09:58:49","guid":{"rendered":"\/knowledge\/forums\/topic\/can-you-limit-the-expansion-of-modes-to-only-those-modes-with-a-high-participation-factors-by-using-the-mxpand-01modm-command-to-ignore-modes-below-a-certain-modal-mass-fraction\/"},"modified":"2022-06-06T09:58:49","modified_gmt":"2022-06-06T09:58:49","slug":"can-you-limit-the-expansion-of-modes-to-only-those-modes-with-a-high-participation-factors-by-using-the-mxpand-01modm-command-to-ignore-modes-below-a-certain-modal-mass-fraction","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/can-you-limit-the-expansion-of-modes-to-only-those-modes-with-a-high-participation-factors-by-using-the-mxpand-01modm-command-to-ignore-modes-below-a-certain-modal-mass-fraction\/","title":{"rendered":"Can you limit the expansion of modes to only those modes with a high participation factors by using the MXPAND,,,,,,.01,,MODM command to ignore modes below a certain modal mass fraction?"},"content":{"rendered":"<p>Yes, but you have to do the modal expansion is a separate solution pass as shown in the following input.<\/p>\n<p>\/prep7<br \/>et,1,185,,2<br \/>mp,ex,1,1e7<br \/>mp,nuxy,1,.3<br \/>mp,dens,1,.0003<\/p>\n<p>block,,20,,2,,1<br \/>esize,1<br \/>vmesh,1<br \/>nsel,s,loc,x,0<br \/>d,all,all<br \/>nsel,all<br \/>fini<br \/>! Obtain the Modal Solution<br \/>\/solu<br \/>antype, MODAL<br \/>modopt, LANB,12             ! Block Lanczos<br \/>solve<br \/>finish<\/p>\n<p>! Perform the modal selection and expansion<br \/>\/solu<br \/>antype, MODAL, RESTART<br \/>mxpand,,,, yes,,, MODM ! Mode selection is based on the modal effective mass, and element<br \/>      ! results are requested<br \/>modseloption,no, no,0.90, no,no,no     ! Only direction X is selected, a minimum of 90% of the total <br \/>   ! mass is requested in this direction<br \/>solve<br \/>finish<\/p>\n","protected":false},"template":"","class_list":["post-158154","topic","type-topic","status-publish","hentry","topic-tag-modm","topic-tag-mxpand"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["06-06-2022 20:20"],"_bbp_forum_id":["27792"],"_btv_view_count":["1680"],"_bbp_likes_count":["0"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/158154","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\/158154\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=158154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}