{"id":310915,"date":"2023-10-10T17:35:49","date_gmt":"2023-10-10T17:35:49","guid":{"rendered":"\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/"},"modified":"2023-10-11T00:55:29","modified_gmt":"2023-10-11T00:55:29","slug":"pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/","title":{"rendered":"Pre-stressed modal why changing end time causes natural frequency to change?"},"content":{"rendered":"<p>Hi all,<\/p>\n<p>I&#8217;ve been using pre-stressed modulue to modal analysis. Under &#8220;Static structural&#8221; -&gt; &#8220;Analysis setting&#8221; -&gt; &#8220;step controls&#8221;, I changed the &#8220;step end time&#8221; from 10 sec to 100 sec and the results of natural frequency changed dramaticlly.&nbsp;<\/p>\n<p>Does anyone know why is that and what kind of phenomenon behind it? Which simulation results should I trust?<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959331-2000pa_10sec.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959331-2000pa_10sec.png\" alt=\"\" width=\"1134\" height=\"780\"><\/a><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959339-2000pa_100sec.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959339-2000pa_100sec.png\" alt=\"\"><\/a><\/p>\n","protected":false},"template":"","class_list":["post-310915","topic","type-topic","status-closed","hentry","topic-tag-ansysstructuresolveIssue-1","topic-tag-Modal_Analysis-1","topic-tag-meshing","topic-tag-natural-frequency","topic-tag-pre-stress"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi all,I&#039;ve been using pre-stressed modulue to modal analysis. Under &quot;Static structural&quot; -&gt; &quot;Analysis setting&quot; -&gt; &quot;step controls&quot;, I changed the &quot;step end time&quot; from 10 sec to 100 sec and the results of natural frequency changed dramaticlly. Does anyone know why is that and what kind of phenomenon behind it? Which simulation results should I\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/\" \/>\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=\"Pre-stressed modal why changing end time causes natural frequency to change? | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi all,I&#039;ve been using pre-stressed modulue to modal analysis. Under &quot;Static structural&quot; -&gt; &quot;Analysis setting&quot; -&gt; &quot;step controls&quot;, I changed the &quot;step end time&quot; from 10 sec to 100 sec and the results of natural frequency changed dramaticlly. Does anyone know why is that and what kind of phenomenon behind it? Which simulation results should I\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959331-2000pa_10sec.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959331-2000pa_10sec.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-10-10T17:35:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-10-11T00:55:29+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Pre-stressed modal why changing end time causes natural frequency to change? | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi all,I&#039;ve been using pre-stressed modulue to modal analysis. Under &quot;Static structural&quot; -&gt; &quot;Analysis setting&quot; -&gt; &quot;step controls&quot;, I changed the &quot;step end time&quot; from 10 sec to 100 sec and the results of natural frequency changed dramaticlly. Does anyone know why is that and what kind of phenomenon behind it? Which simulation results should I\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/10-10-2023-1696959331-2000pa_10sec.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\\\/topic\\\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\\\/#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\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/meshing\\\/#listItem\",\"name\":\"meshing\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/meshing\\\/#listItem\",\"position\":3,\"name\":\"meshing\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/meshing\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\\\/#listItem\",\"name\":\"Pre-stressed modal why changing end time causes natural frequency to change?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\\\/#listItem\",\"position\":4,\"name\":\"Pre-stressed modal why changing end time causes natural frequency to change?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/meshing\\\/#listItem\",\"name\":\"meshing\"}}]},{\"@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\\\/topic\\\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/pre-stressed-modal-why-changing-end-time-causes-natural-frequency-to-change-2\\\/\",\"name\":\"Pre-stressed modal why changing end time causes natural frequency to change? | Ansys Learning Forum\",\"description\":\"Hi all,I've been using pre-stressed modulue to modal analysis. 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