{"id":397181,"date":"2024-12-11T22:18:11","date_gmt":"2024-12-11T22:18:11","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/selecting-of-modes-for-good-mass-participation\/"},"modified":"2024-12-11T22:18:11","modified_gmt":"2024-12-11T22:18:11","slug":"selecting-of-modes-for-good-mass-participation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/selecting-of-modes-for-good-mass-participation\/","title":{"rendered":"Selecting # of Modes for good Mass Participation"},"content":{"rendered":"<p>&lt;p&gt;Hello.&lt;\/p&gt;&lt;p&gt;When performing modal analyses, I have generally tried to make sure that I have enough modes in the analysis to get an effective mass ratio of ~0.9 in each of the important directions of the downstream analyses. However, I generally have to guess how many modes that is. What I&#8217;ve found myself doing is running a modal analysis seeking hundreds of modes, sometimes up to 500, then I will go through the Ratio of Effective Mass to Total Mass table and figure out how many modes I need to hit ~0.9 in each direction. Then I can re-run the modal analysis with that found number.&lt;\/p&gt;&lt;p&gt;I was wondering if there was an easier way to do this? Like, can I tell Ansys Mechanical to just keep solving for modes until it reaches the mass ratio, or perhaps run something to predict the number of modes needed?&lt;\/p&gt;&lt;p&gt;Any assistance in this regard would be greatly appreciated. Thank you.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-397181","topic","type-topic","status-publish","hentry","topic-tag-Modal_Analysis-1","topic-tag-ansys-mechanical"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["397181"],"_bbp_subscription":["65888","431745","20905"],"_bbp_author_ip":["72.43.62.222"],"_bbp_last_reply_id":["397424"],"_bbp_last_active_id":["397424"],"_bbp_last_active_time":["2024-12-13 14:42:22"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["65888","431745","20905"],"_btv_view_count":["652"],"_bbp_topic_status":["unanswered"]},"test":"jbettingergandh-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/397181","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\/397181\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=397181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}