{"id":187813,"date":"2021-08-15T04:02:55","date_gmt":"2021-08-15T04:02:55","guid":{"rendered":"\/forum\/forums\/reply\/187813\/"},"modified":"2021-08-15T04:23:13","modified_gmt":"2021-08-15T04:23:13","slug":"187813","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/","title":{"rendered":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical"},"content":{"rendered":"<p>Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png\" width=\"715\" height=\"411\" \/>Looking at the plot in the paper shown below, I don&#8217;t think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height at the same time that the base is vibrating. This makes the simulation easier, since I had to create a 3 step simulation to first let the mass settle to the equilibrium height, then start the base motion. But experimentally, that is an odd setup. It means the mass must be supported so that the springs are not compressed and the mass is released at the same time that the base motion begins. Don&#8217;t you think that is an odd way to run an experiment?<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/325\/KJ4BFJ0PTAQX.png\" width=\"532\" height=\"499\" \/><\/p>\n","protected":false},"template":"","class_list":["post-187813","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=\"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don&#039;t think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/\" \/>\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: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don&#039;t think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-08-15T04:02:55+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-08-15T04:23:13+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don&#039;t think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png\" \/>\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\\\/187813\\\/#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\\\/187813\\\/#listItem\",\"name\":\"Reply To: How to perform two step dynamic analysis in Ansys Mechanical\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/187813\\\/#listItem\",\"position\":2,\"name\":\"Reply To: How to perform two step dynamic analysis in Ansys Mechanical\",\"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\\\/187813\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/187813\\\/\",\"name\":\"Reply To: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum\",\"description\":\"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don't think the authors in that paper are starting the base excitation after gravity has dropped down the mass. 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I think the mass is falling to the equilibrium height","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/#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\/187813\/#listItem","name":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/#listItem","position":2,"name":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical","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\/187813\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/","name":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum","description":"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don't think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/#breadcrumblist"},"datePublished":"2021-08-15T04:02:55+00:00","dateModified":"2021-08-15T04:23:13+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum","og:description":"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don't think the authors in that paper are starting the base excitation after gravity has dropped down the mass. I think the mass is falling to the equilibrium height","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/187813\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/527\/440FRWFWMY0S.png","article:published_time":"2021-08-15T04:02:55+00:00","article:modified_time":"2021-08-15T04:23:13+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: How to perform two step dynamic analysis in Ansys Mechanical | Ansys Learning Forum","twitter:description":"Here is the linear material, which has an 11.6 Hz natural frequency, delivering the expected isolation: Looking at the plot in the paper shown below, I don't think the authors in that paper are starting the base excitation after gravity has dropped down the mass. 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