{"id":46136,"date":"2020-07-15T10:38:25","date_gmt":"2020-07-15T10:38:25","guid":{"rendered":"\/forum\/forums\/topic\/modal-analysis-mode-shape-data-extraction-problem\/"},"modified":"2020-07-15T10:38:25","modified_gmt":"2020-07-15T10:38:25","slug":"modal-analysis-mode-shape-data-extraction-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modal-analysis-mode-shape-data-extraction-problem\/","title":{"rendered":"Modal analysis (mode shape data extraction problem)"},"content":{"rendered":"<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">Hi All,<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">Hope you are well.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">I am using Ansys Workbench to get the&nbsp;mode shapes for the rail as shown below. The results are used to compare that with experimental result.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">In the experimental test, a hammer is used to generate excitation by tapping on the top surface of the track and LDV is used to get vibration signal. Data was processed with Matlab and I succeeded to get the natural frequency and mode shape(amplitude) for mode 1 to mode 9.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">However, when I use Ansys Workbench to simulate, I could get natural frequency and mode shape images, but I failed to get the specific data of mode shape(amplitude).<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">Could anyone please help me&nbsp;figure&nbsp;out how to extract mode shape(amplitude) data along vertical direction? For example, to get the mode shape((amplitude)) of point 1 in mode&nbsp;2 in order to compare that in the experimental results. My final go is to exact the mode shape(amplitude) of any specific points along the track.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">In addtiton,&nbsp; could anyone please help me to find where the nodes are( zero diplacement position). I also want to extract the nodes position. Thank you very much.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\"><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/140eab89-209a-4482-a063-abf900a594f2\/2adbc676-dcf3-45c0-8c1f-abf900af5381_1.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\"><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/140eab89-209a-4482-a063-abf900a594f2\/ba9d9cc1-0b3c-48d6-9cca-abf900aee8b3_2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-46136","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["18318"],"_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"],"_btv_view_count":["1885"],"_bbp_subscription":["253717"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["46136"],"_bbp_forum_id":["27791"],"_bbp_engagement":["200","179601"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["121564"],"_bbp_last_active_id":["121564"],"_bbp_last_active_time":["2020-07-16 10:48:57"]},"test":"mengtai"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/46136","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\/46136\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=46136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}