{"id":44812,"date":"2020-06-06T18:19:25","date_gmt":"2020-06-06T18:19:25","guid":{"rendered":"\/forum\/forums\/topic\/natural-frequency-too-low\/"},"modified":"2020-06-06T18:19:25","modified_gmt":"2020-06-06T18:19:25","slug":"natural-frequency-too-low","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-frequency-too-low\/","title":{"rendered":"Natural frequency too low"},"content":{"rendered":"<p>I have run modal analysis on bridge deck. I get results for the first mode shape at around 1&#215;10^-2 Hz. When comparing this to data on the same deck with the same material properties, the results are 3 Hz. For the sake of updating the model, I have altered the densities and Young&#8217;s Modulus of the materials, and no change to the frequency occurs.<\/p>\n<p><\/p>\n<p>Are there any suggestions on what else I can do to increase the natural frequency results?<\/p>\n<p><\/p>\n<p>(The mode shape of the image is exaggerated via the scale factor, just to show the shape).<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"blob:https:\/\/studentcommunity.ansys.com\/e61213d8-38b5-41ba-98db-2faf3485a445\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"blob:https:\/\/studentcommunity.ansys.com\/0cd420bd-3b4e-409e-94cf-0a4020be9031\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-44812","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16993"],"_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":["2476"],"_bbp_subscription":["250274"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44812"],"_bbp_forum_id":["27791"],"_bbp_engagement":["79","176103"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["117091"],"_bbp_last_active_id":["117091"],"_bbp_last_active_time":["2020-06-08 22:37:30"]},"test":"aaronpap01"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44812","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\/44812\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}