{"id":158156,"date":"2022-06-06T09:58:54","date_gmt":"2022-06-06T09:58:54","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/"},"modified":"2022-06-06T10:27:50","modified_gmt":"2022-06-06T10:27:50","slug":"how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/","title":{"rendered":"How can I get the modal contributions to my random vibration (PSD) one sigma values?"},"content":{"rendered":"<p>The square root of the variance can be used as a mode coefficient. The variance can be retrieved using the *GET,,mode,N,mcoef command. See the sample input below. For those commands to work in Mechanical, you need to save the modal results and MAPDL database file (set the &ldquo;Keep Modal Results&rdquo; to Yes under the Analysis Settings and set the &ldquo;Save MAPDL db&rdquo; to Yes).<br \/>resume<br \/>\/post1<br \/>*get,mcoef_3,mode,3,mcoef<br \/>mcoef_3=sqrt(mcoef_3)<br \/>\/post1<br \/>set,1,3,mcoef_3*3 ! contribution of mode 3 to 3 sigma results<br \/>\/show,png<br \/>plns,s,eqv<\/p>\n","protected":false},"template":"","class_list":["post-158156","topic","type-topic","status-publish","hentry","topic-tag-modal","topic-tag-modal-contribution","topic-tag-psd","topic-tag-random-vibration"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The square root of the variance can be used as a mode coefficient. The variance can be retrieved using the *GET,,mode,N,mcoef command. See the sample input below. For those commands to work in Mechanical, you need to save the modal results and MAPDL database file (set the \u201cKeep Modal Results\u201d to Yes under the Analysis\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/\" \/>\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 Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"How can I get the modal contributions to my random vibration (PSD) one sigma values? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"The square root of the variance can be used as a mode coefficient. The variance can be retrieved using the *GET,,mode,N,mcoef command. See the sample input below. For those commands to work in Mechanical, you need to save the modal results and MAPDL database file (set the \u201cKeep Modal Results\u201d to Yes under the Analysis\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-06-06T09:58:54+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-06-06T10:27:50+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How can I get the modal contributions to my random vibration (PSD) one sigma values? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The square root of the variance can be used as a mode coefficient. The variance can be retrieved using the *GET,,mode,N,mcoef command. See the sample input below. For those commands to work in Mechanical, you need to save the modal results and MAPDL database file (set the \u201cKeep Modal Results\u201d to Yes under the Analysis\" \/>\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\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/random-vibration\\\/#listItem\",\"name\":\"random-vibration\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/random-vibration\\\/#listItem\",\"position\":3,\"name\":\"random-vibration\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/random-vibration\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\\\/#listItem\",\"name\":\"How can I get the modal contributions to my random vibration (PSD) one sigma values?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\\\/#listItem\",\"position\":4,\"name\":\"How can I get the modal contributions to my random vibration (PSD) one sigma values?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/random-vibration\\\/#listItem\",\"name\":\"random-vibration\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-can-i-get-the-modal-contributions-to-my-random-vibration-psd-one-sigma-values\\\/\",\"name\":\"How can I get the modal contributions to my random vibration (PSD) one sigma values? | Ansys Knowledge\",\"description\":\"The square root of the variance can be used as a mode coefficient. 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