{"id":41814,"date":"2020-03-16T09:07:08","date_gmt":"2020-03-16T09:07:08","guid":{"rendered":"\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/"},"modified":"2020-03-16T09:07:08","modified_gmt":"2020-03-16T09:07:08","slug":"finding-damping-ratio-theoretically","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/finding-damping-ratio-theoretically\/","title":{"rendered":"Finding Damping ratio theoretically"},"content":{"rendered":"<p>I am trying<strong> to determine the material damping ratio(hysteretic) of a material using ANSYS<\/strong>. I already know its Young&#8217;s modulus, Poisson&#8217;s ratio, Shear modulus and its density; and the material is isotropic.<\/p>\n<p><\/p>\n<p>I performed modal analysis on the material of a rectangular cross section(40mmx10mm), length 500mm and fixed at one end(cantilever) and found its first natural frequency.<\/p>\n<p><\/p>\n<p>I came across the half power bandwidth method and hence I tried harmonic analysis by applying a force of 1000N at the free end.<\/p>\n<p><\/p>\n<p>The amplitude goes to infinity(like 1000 meters) near and at the first natural frequency.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>How can <strong>I determine the structural damping ratio from these values from this harmonic frequency response curve?<\/strong><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-41814","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["13994"],"_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":["1818"],"_bbp_subscription":["248605"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["41814"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","174385"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["108056"],"_bbp_last_active_id":["108056"],"_bbp_last_active_time":["2020-03-17 14:06:17"]},"test":"newuserdampingratio"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/41814","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\/41814\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=41814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}