{"id":308368,"date":"2023-09-25T11:40:29","date_gmt":"2023-09-25T11:40:29","guid":{"rendered":"\/forum\/forums\/reply\/308368\/"},"modified":"2023-09-25T11:40:29","modified_gmt":"2023-09-25T11:40:29","slug":"308368","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/308368\/","title":{"rendered":"Reply To: PCB trace mapping issue"},"content":{"rendered":"<p>&lt;p&gt;Hello All&lt;\/p&gt;&lt;p&gt;My PCB (made of FR4 having 12 layer with total thickness of 2.4 mm) geometry has 4 nos. of diameter 3.5 mm from 5 mm inside from edges and assembled using M3.5 socket head screws. PCB is mounted on vibration plate through Diameter 7 aluminium spaces at 4 mounting location which also have diameter 3.5 through holes. Each screw is given torque of 58 N-cm.&lt;\/p&gt;&lt;p&gt;&nbsp;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/25-09-2023-1695641259-PCB_detail.JPG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;I am facing issue after trace mapping on 2d shell geometry. When i am not considering the hole in FE analysis and fixed support is taken at center node at hole location , my simulation first mode frequency is matching with that of actual vibration result but when i am considering the hole and hole edge is given as fixed boundary condition , my simulation first mode frequency is higher than the vibration result.&lt;\/p&gt;&lt;p&gt;&lt;br data-mce-bogus=&#8221;1&#8243;&gt;&lt;\/p&gt;&lt;p&gt;Anyone can help in this regards , i am not able to understand why such a thing is happening.&lt;\/p&gt;&lt;p&gt;&lt;br data-mce-bogus=&#8221;1&#8243;&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-308368","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/308368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/308368\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=308368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}