{"id":164612,"date":"2021-12-06T12:46:52","date_gmt":"2021-12-06T12:46:52","guid":{"rendered":"\/forum\/forums\/topic\/what-is-cumulative-mass-fraction\/"},"modified":"2022-08-24T11:40:52","modified_gmt":"2022-08-24T11:40:52","slug":"what-is-cumulative-mass-fraction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-is-cumulative-mass-fraction\/","title":{"rendered":"what is cumulative mass fraction ?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p> l am doing modal analysis of a cantilever using ANSYS 19.R2, in the result tables (effective mass &amp; participation factor) there is a column called (cumulative mass fraction) , what is cumulative mass fraction and how to be calculated ? .Also when i tried to find the ratio between effective mass to total mass (by dividing effective mass\/total mass) it didn&#039;t match the mentioned ratio in the last column in the case of ROTATION directions (about x,y&amp;z axis), what is wrong with that ?<\/p>\n","protected":false},"template":"","class_list":["post-164612","topic","type-topic","status-closed","hentry","topic-tag-modal-analysis"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"l am doing modal analysis of a cantilever using ANSYS 19.R2, in the result tables (effective mass &amp; participation factor) there is a column called (cumulative mass fraction) , what is cumulative mass fraction and how to be calculated ? .Also when i tried to find the ratio between effective mass to total mass (by\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-is-cumulative-mass-fraction\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta 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