{"id":166892,"date":"2022-03-02T09:32:46","date_gmt":"2022-03-02T09:32:46","guid":{"rendered":"\/forum\/forums\/topic\/why-is-there-a-huge-difference-in-hand-calculations-and-ansys-mechanical-results\/"},"modified":"2022-03-07T06:41:57","modified_gmt":"2022-03-07T06:41:57","slug":"why-is-there-a-huge-difference-in-hand-calculations-and-ansys-mechanical-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-is-there-a-huge-difference-in-hand-calculations-and-ansys-mechanical-results\/","title":{"rendered":"Why is there a huge difference in Hand calculations and Ansys Mechanical results?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello!<\/p>\n<p>I have been doing modal analysis of a fixed beam with a point load acting at its centre. The natural frequency of the beam which i have calculated is aroung 23Hz and in ansys modal analysis it is 112Hz in bending mode. (2nd mode in modal analysis)<\/p>\n<p>I am using a 170*80*4mm Rect Hollow beam of lenght 2m with both the ends fixed and a central load of 1000N acting on it. The mass of the beam per lenght is 5.45. the material is structural steel, E=210 GPA, Density=7405 kg\/m^3, I=420565mm^4, y=35mm.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/317\/0OH8BG92HN2X.jpg\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/317\/0OH8BG92HN2X.jpg\" alt=\"boundry conditions.JPG\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166892","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["2055"],"_bbp_likes_count":["0"],"_bbp_subscription":["250289"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["166892"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","32680","250289"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["207125"],"_bbp_last_active_id":["207125"],"_bbp_last_active_time":["2022-03-07 06:41:57"]},"test":"mohammedzabeeullahkhangmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/166892","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\/166892\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=166892"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}