{"id":36635,"date":"2019-07-18T18:10:20","date_gmt":"2019-07-18T18:10:20","guid":{"rendered":"\/forum\/forums\/topic\/optimization-of-frf-to-matching-the-test-results\/"},"modified":"2019-07-18T18:10:20","modified_gmt":"2019-07-18T18:10:20","slug":"optimization-of-frf-to-matching-the-test-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/optimization-of-frf-to-matching-the-test-results\/","title":{"rendered":"optimization of FRF to matching the test results"},"content":{"rendered":"<p>Hi&nbsp;eveybody<\/p>\n<p><\/p>\n<p>I&#8217;m working on vertebral&nbsp; and disc of an animal<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/1f356dee-449c-4ce8-a47e-aa8e0115d344\/f0a9dec4-be5d-44d9-b176-aa8e012ac85f_ansys-disk.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>two whites part are disk and others are vertebral&nbsp;&nbsp;<\/p>\n<p><\/p>\n<p>I have the Frequency response function(FRF) from experimental test and the goal is to optimize the 3D cad model in ansys to reach the same FRF as test . I&nbsp;approximately optimized the natural frequencies which defines the horizontal position of two first peaks in FRF plot by placing the young&#8217;s module (E) and poisson&#8217;s ratio(v) as input parameter and natural frequencies as objective function to achieve the same frequencies as test.&nbsp;for optimizing the vertical position of peaks in FRF plot, i consider the constant damping ratio for each of vertebral and disk in engineering data and set these values as input parameters and set maximum amplitude of FRF as objective function to approaching test FRF and the i obtain these plots :&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/1f356dee-449c-4ce8-a47e-aa8e0115d344\/edf1a672-0b2c-47db-b634-aa8e0128ed4d_modalfrfoptimze.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>as you see the maximum amplitudes are approximately equal but the overall shape of optimization data near the two first peaks are not same.so how i can solve this problem to obtain closest ansys frf to test frf ? is my considered input parameters for this purpose true ? if not,which parameters should i consider as inputs ?<\/p>\n","protected":false},"template":"","class_list":["post-36635","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["8807"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["657"],"_bbp_subscription":["241513"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["36635"],"_bbp_forum_id":["27791"],"_bbp_engagement":["160648","166865","167687"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["92369"],"_bbp_last_active_id":["92369"],"_bbp_last_active_time":["2019-08-17 17:06:34"]},"test":"shayan23"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/36635","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\/36635\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=36635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}