{"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>Hello.<\/p><p>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’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.<\/p><p>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?<\/p><p>Any assistance in this regard would be greatly appreciated. Thank you.<\/p><\/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":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t