{"id":437842,"date":"2025-07-26T10:24:20","date_gmt":"2025-07-26T10:24:20","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-frequancy-of-simple-supported-beam\/"},"modified":"2025-07-26T10:24:20","modified_gmt":"2025-07-26T10:24:20","slug":"natural-frequancy-of-simple-supported-beam","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-frequancy-of-simple-supported-beam\/","title":{"rendered":"Natural frequancy of simple supported beam"},"content":{"rendered":"<p>&lt;p&gt;&lt;span class=&#8221;selected&#8221;&gt;During a recent modal analysis performed on a simple beam, to determine its natural frequency sqrt(&lt;\/span&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;k&lt;\/span&gt;\/&lt;span class=&#8221;mord mathnormal&#8221;&gt;m&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;vlist-s&#8221;&gt;\u200b&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt;).&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span class=&#8221;selected&#8221;&gt;The beam in question has a radius (R) of &lt;\/span&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;12.5&lt;\/span&gt;&lt;span class=&#8221;mord&#8221;&gt;&nbsp;mm&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt; and a length (L) of &lt;\/span&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;500&lt;\/span&gt;&lt;span class=&#8221;mord&#8221;&gt;&nbsp;mm&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt;. Its calculated mass is approximately &lt;\/span&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;1.9266&lt;\/span&gt;&lt;span class=&#8221;mord&#8221;&gt;&nbsp;kg&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt;.&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span class=&#8221;selected&#8221;&gt;During the analysis, I observed significant differences in the natural frequency results when the beam was modeled using different element types compared to a direct theoretical calculation:&lt;\/span&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>&lt;p&gt;<strong>&lt;span class=&#8221;selected&#8221;&gt;Direct Calculation:&lt;\/span&gt;<\/strong>&lt;span class=&#8221;selected&#8221;&gt; The natural frequency was calculated to be approximately &lt;\/span&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;139&lt;\/span&gt;&lt;span class=&#8221;mord&#8221;&gt;&nbsp;Hz&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt;.&lt;br&gt;Beam element :&lt;\/span&gt;&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;&lt;span class=&#8221;selected&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/07\/26-07-2025-1753525361-mceclip0.png\" width=\"1105\" height=\"446\" \/>&lt;\/span&gt;&lt;\/p&gt;<\/li>\n<li>&lt;span class=&#8221;selected&#8221;&gt;Solid parts&lt;\/span&gt;&lt;span class=&#8221;selected&#8221;&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/07\/26-07-2025-1753525415-mceclip1.png\" width=\"1150\" height=\"483\" \/>&lt;\/span&gt;<\/li>\n<li>&lt;span class=&#8221;selected&#8221;&gt;Can anyone explain why?&lt;\/span&gt;<\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-437842","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27796"],"_bbp_topic_id":["437842"],"_bbp_subscription":["1951","58821","578313"],"_bbp_author_ip":["89.237.150.158"],"_bbp_last_reply_id":["438310"],"_bbp_last_active_id":["438310"],"_bbp_last_active_time":["2025-07-31 18:23:14"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["1951","58821","578313"],"_btv_view_count":["132"],"_bbp_topic_status":["unanswered"]},"test":"mahmoud-darwishalexu-edu-eg"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/437842","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\/437842\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=437842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}