{"id":346967,"date":"2024-01-29T09:26:53","date_gmt":"2024-01-29T09:26:53","guid":{"rendered":"\/forum\/forums\/reply\/346967\/"},"modified":"2024-01-29T09:26:53","modified_gmt":"2024-01-29T09:26:53","slug":"346967","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346967\/","title":{"rendered":"Reply To: Response of a system to an excitation on the frame"},"content":{"rendered":"<p>&lt;p&gt;Hello Peter,&lt;\/p&gt;&lt;p&gt;I have a doubt regarding the natural frequencies of the system. Suppose when I am modeling this system analytically, I consider the mass at the center as the first mass and the whole frame as the second mass, making it a 2 degree of freedom system. Corresponsing calulations will give two natural frequencies as well, based on which further calculations can be done. In FE analysis, how is possible to extract which modal frequency corresponds to which part, mass part or the frame.&lt;\/p&gt;&lt;p&gt;Precisely, what does the different modal frequency values in the FE modal analysis tell us. Which of those should be considered and which all should be neglected?&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-346967","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello Peter,I have a doubt regarding the natural frequencies of the system. Suppose when I am modeling this system analytically, I consider the mass at the center as the first mass and the whole frame as the second mass, making it a 2 degree of freedom system. Corresponsing calulations will give two natural frequencies as\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346967\/\" \/>\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 property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Response of a system to an excitation on the frame | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello Peter,I have a doubt regarding the natural frequencies of the system. Suppose when I am modeling this system analytically, I consider the mass at the center as the first mass and the whole frame as the second mass, making it a 2 degree of freedom system. Corresponsing calulations will give two natural frequencies as\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346967\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-01-29T09:26:53+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-01-29T09:26:53+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Response of a system to an excitation on the frame | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello Peter,I have a doubt regarding the natural frequencies of the system. Suppose when I am modeling this system analytically, I consider the mass at the center as the first mass and the whole frame as the second mass, making it a 2 degree of freedom system. Corresponsing calulations will give two natural frequencies as\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/346967\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/346967\\\/#listItem\",\"name\":\"Reply To: Response of a system to an excitation on the frame\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/346967\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Response of a system to an excitation on the frame\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/346967\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/346967\\\/\",\"name\":\"Reply To: Response of a system to an excitation on the frame | Ansys Learning Forum\",\"description\":\"Hello Peter,I have a doubt regarding the natural frequencies of the system. Suppose when I am modeling this system analytically, I consider the mass at the center as the first mass and the whole frame as the second mass, making it a 2 degree of freedom system. 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