{"id":50950,"date":"2020-12-31T11:40:51","date_gmt":"2020-12-31T11:40:51","guid":{"rendered":"\/forum\/forums\/topic\/modal-analysis-non-zero-natural-frequency-result-for-un-constrained-geometry\/"},"modified":"2020-12-31T11:40:51","modified_gmt":"2020-12-31T11:40:51","slug":"modal-analysis-non-zero-natural-frequency-result-for-un-constrained-geometry","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modal-analysis-non-zero-natural-frequency-result-for-un-constrained-geometry\/","title":{"rendered":"Modal analysis non-zero natural frequency result for un-constrained geometry."},"content":{"rendered":"<p>I am trying to perform Modal Analysis on a two-wheeler frame structure assembly. The assembly earlier had penetration and gaps. I have attached different components via bonded type contact and tried to adjust the closure of contact via pinball radius and eliminated penetrations by editing geometry via Spaceclaim. The geometry now only has gaps (which I cannot eliminate). While running the Modal Analysis for un-constrained geometry, I am getting first three natural frequencies as zero but 4th to 6th as non-zero values. Also, the first six mode shapes are normal (first three displacements and the later three as rotation about the three axis). What should I do to make all six natural frequencies as zeron<\/p>\n","protected":false},"template":"","class_list":["post-50950","topic","type-topic","status-closed","hentry","topic-tag-chassis","topic-tag-modal-analysis","topic-tag-natural-frequency","topic-tag-vibration"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["23204"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["g???"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1852"],"_bbp_subscription":["245089"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["50950"],"_bbp_forum_id":["27791"],"_bbp_engagement":["200","166004","170727"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["137792"],"_bbp_last_active_id":["137792"],"_bbp_last_active_time":["2021-01-06 10:37:18"]},"test":"vishalyadav08"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/50950","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\/50950\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=50950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}