{"id":396222,"date":"2024-12-04T09:29:42","date_gmt":"2024-12-04T09:29:42","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/does-ansys-modal-already-count-on-objects-selfweight\/"},"modified":"2024-12-04T09:29:42","modified_gmt":"2024-12-04T09:29:42","slug":"does-ansys-modal-already-count-on-objects-selfweight","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/does-ansys-modal-already-count-on-objects-selfweight\/","title":{"rendered":"Does Ansys Modal already count on object&#8217;s selfweight?"},"content":{"rendered":"<p>&lt;p&gt;Hi all, i wonder if Ansys Modal includes object&#8217;s selfweight in analysis or not.&lt;\/p&gt;&lt;p&gt;I&#8217;m modelling a pipe section (using 3D Solid element) to determine its frequencies respective to the first 4 mode shapes. However, I was afraid that Modal does not count on this aspect, especially weight in vertical direction, so I insert &#8220;Standard Earth Gravity&#8221; via a Static Strutural module, along with fixed support at 1 pipe end as well as displacement constraint at the other end (only free for pipe axial direction). Then, put the results from Static Strutural module into Modal module as pre-stress. However, the program keeps sending error message &#8220;During the multiframe restart process, neither the .RDB file nor the .Rnnn files were found. &nbsp;Both files are required to perform the multiframe restart for the linear perturbation analysis. &nbsp;You must use the RESCONTROL,LINEAR command in the prior base analysis. &nbsp;The ANTYPE, ,RESTART command is ignored.&#8221;&lt;\/p&gt;&lt;p&gt;So I assumed inserting &#8220;Standard Earth Gravity&#8221; via a Static Strutural module is incorrect and not necessary. Please advise my confusion. Thank you all in advance!&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/04-12-2024-1733304555-2.JPG\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396222","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["396222"],"_bbp_subscription":["489091","58821"],"_bbp_author_ip":["183.91.19.26"],"_bbp_last_reply_id":["396236"],"_bbp_last_active_id":["396236"],"_bbp_last_active_time":["2024-12-04 10:12:16"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["489091","58821"],"_btv_view_count":["124"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["489091"]},"test":"98cf9a734b200f800e8dcbfb9b1b43ae564b996b"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396222","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/396222\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=396222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}