{"id":32146,"date":"2018-12-14T09:48:25","date_gmt":"2018-12-14T09:48:25","guid":{"rendered":"\/forum\/forums\/topic\/constant-damping-ratio-for-full-transient-analysis\/"},"modified":"2018-12-14T09:48:25","modified_gmt":"2018-12-14T09:48:25","slug":"constant-damping-ratio-for-full-transient-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/constant-damping-ratio-for-full-transient-analysis\/","title":{"rendered":"Constant damping ratio for Full Transient Analysis"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p><\/p>\n<p>I would like to run a Full Transient simulation with a constant damping ratio.<\/p>\n<p><\/p>\n<p>In the analysis settings, only Rayleigh damping is offered in terms of [Betad] and [Alphad]&nbsp;commands, which are computed from two (main) frequencies of the system. This damping declaration is not useful for my study case, as it originates underdamped and overdamped regions.<\/p>\n<p><\/p>\n<p>Structural damping [DMPSTR] (or [DMPS] for multiple materials), as well as the Damping coefficient ratio [DMPR], can also be considered by the solver by specifying the [DMPRFreq] command. However, once again these are&nbsp;depending on the dominant frequency of the system.<\/p>\n<p><\/p>\n<p>Could anyone make the implementation&nbsp;of this constant damping ratio clear to me? I&nbsp;think I am missing something here, I would expect this declaration to be straightforward, such as the&nbsp;case of the Transient Analysis with Modal Superposition, where a constant damping coefficient [DMPRAT] can be chosen&nbsp;directly in the damping controls.<\/p>\n<p><\/p>\n<p>Thank you in advance. I would appreciate any input regarding this matter.<br \/>Best,<\/p>\n","protected":false},"template":"","class_list":["post-32146","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["4318"],"_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","0","0","0"],"_btv_view_count":["1993"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["32146"],"_bbp_forum_id":["27791"],"_bbp_engagement":["4","156586","161160"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["72453"],"_bbp_last_active_id":["72453"],"_bbp_last_active_time":["2018-12-14 23:40:32"]},"test":"ga83sas"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/32146","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\/32146\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=32146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}