{"id":306733,"date":"2023-09-13T23:02:24","date_gmt":"2023-09-13T23:02:24","guid":{"rendered":"\/forum\/forums\/topic\/modal-analysis-with-viscoelastic-material\/"},"modified":"2023-09-13T23:02:24","modified_gmt":"2023-09-13T23:02:24","slug":"modal-analysis-with-viscoelastic-material","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modal-analysis-with-viscoelastic-material\/","title":{"rendered":"Modal Analysis with Viscoelastic Material"},"content":{"rendered":"<p>Greetings;<\/p>\n<p>I am interested on performing a modal analysis, but I am an issue with the number of mode to be extracted. The geometry is a power module encapsulated with a gel material. I am interested in to understand how it behaves under vibration. It looks like I need to extract a huge number of modes to obtain a significant ratio of effective to total mass, due to the gel material. Currently, I am extracting 600 modes and the ratio of effective to total mass is less than 0.1. How can I perform a modal analysis when I have material that differ greatly in mass and stiffness (gel and metal)? Is there is a way to reduce the number of modes needed to be extracted or reduce the number of modes &#8220;detected&#8221; by ANSYS and just extract the significant ones?<\/p>\n<p>Thanks,<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-306733","topic","type-topic","status-closed","hentry","topic-tag-modal"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Greetings;I am interested on performing a modal analysis, but I am an issue with the number of mode to be extracted. The geometry is a power module encapsulated with a gel material. I am interested in to understand how it behaves under vibration. 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