{"id":311600,"date":"2023-10-16T09:35:07","date_gmt":"2023-10-16T09:35:07","guid":{"rendered":"\/forum\/forums\/topic\/trace-mapping-modal-analysis-results-not-matching-with-vibration-test-results\/"},"modified":"2023-10-16T09:35:07","modified_gmt":"2023-10-16T09:35:07","slug":"trace-mapping-modal-analysis-results-not-matching-with-vibration-test-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/trace-mapping-modal-analysis-results-not-matching-with-vibration-test-results\/","title":{"rendered":"TRACE MAPPING MODAL ANALYSIS RESULTS NOT MATCHING WITH VIBRATION TEST RESULTS!!!"},"content":{"rendered":"<p>I have made a 12 layers PCB which has uniform layer copper content (20%) and pattern from top to bottom layers.<\/p>\n<p>I used trace mapping technique for PCB modelling followed by modal analysis.<\/p>\n<p>The result of modal analysis and actual vibration test results are as follows:<\/p>\n<ul>\n<li>modal analysis first mode frequency : 447 Hz<\/li>\n<li>actual vibration test frequency observed : 345.6 Hz<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/mail.google.com\/mail\/u\/0?ui=2&amp;ik=b05573ed29&amp;attid=0.1&amp;permmsgid=msg-f:1779903504051549438&amp;th=18b37cce7d7734fe&amp;view=fimg&amp;fur=ip&amp;sz=s0-l75-ft&amp;attbid=ANGjdJ_lT3YdOcdlQWpKjKpI4dfMYPfZORw6yM0yXnwCiua0KDnl48vQncrfTR_KLJpvELnOt5n3M5wrLUK0RD8xl29rEr9ibIJoBS9tJECY6roHkjzV79pFpm2CahE&amp;disp=emb\"><\/p>\n<p>&nbsp;<\/p>\n<p>Layers thickness details are as follows:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/mail.google.com\/mail\/u\/0?ui=2&amp;ik=b05573ed29&amp;attid=0.2&amp;permmsgid=msg-f:1779903504051549438&amp;th=18b37cce7d7734fe&amp;view=fimg&amp;fur=ip&amp;sz=s0-l75-ft&amp;attbid=ANGjdJ--p7yEDDt64ADiUDYc-i57KUAJlUq6kgw8-m_uFfHo-MXgPj_Ws9jLnIp2kjiHb3dFUz3dhdcOpriKoAoIX1ORBDqyeP8CLhD9AViMx5JZgx-QTGw0Plq-WMY&amp;disp=emb\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/mail.google.com\/mail\/u\/0?ui=2&amp;ik=b05573ed29&amp;attid=0.0.1&amp;permmsgid=msg-f:1779901170021189374&amp;th=18b37aaf0e6a46fe&amp;view=fimg&amp;fur=ip&amp;sz=s0-l75-ft&amp;attbid=ANGjdJ_8N-blLqrrgFdanXv2vHt2eSzHhN0oLEZ2emC3IbcSBq8wJtB06dYFPzILS6z97E62YnJt2zQ1IN6F2Bs_hvZn9loutTnaTBV7ouqJwJOE61fJ5YzmzbT51I0&amp;disp=emb\"><\/p>\n<p>PCB dimensions: 125x100x2.3773 (all are in mm).&nbsp; Bare PCB Mass: 55gm<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/13-10-2023-1697184974-TEST-SETUP.PNG\"><\/p>\n<p>&nbsp;<\/p>\n<p>I can share the PCB file if required.<\/p>\n<p>&nbsp;<\/p>\n<p>Please help which boundary conditions will leads to simulation results close to vibration test results.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-311600","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have made a 12 layers PCB which has uniform layer copper content (20%) and pattern from top to bottom layers.I used trace mapping technique for PCB modelling followed by modal analysis.The result of modal analysis and actual vibration test results are as follows:modal analysis first mode frequency : 447 Hzactual vibration test frequency observed\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/trace-mapping-modal-analysis-results-not-matching-with-vibration-test-results\/\" \/>\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=\"TRACE MAPPING MODAL ANALYSIS RESULTS NOT MATCHING WITH VIBRATION TEST RESULTS!!! 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