{"id":217268,"date":"2022-06-30T04:30:27","date_gmt":"2022-06-30T04:30:27","guid":{"rendered":"\/forum\/forums\/topic\/response-spectrum\/"},"modified":"2022-06-30T04:30:27","modified_gmt":"2022-06-30T04:30:27","slug":"response-spectrum","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/response-spectrum\/","title":{"rendered":"Response spectrum"},"content":{"rendered":"<p>I am doing response spectrum analysis.i did modal analysis,first natural frequency is 457 Hz.i took sufficent modes so that sum of ratio of effective mass to total mass is 0.9. I gave displacement spectrum input as 2.5 mm up 10Hz,10-20Hz 0.68 mm,20-25Hz 0.45 mm,25-30Hz 0.28 mm,30-33Hz 0.23 mm.I kept on missing mass effect and rigid response.In the result i got stresses like 2000Mpa.My first natural freq is 457Hz.is it possible or i did any mistake.<\/p>\n","protected":false},"template":"","class_list":["post-217268","topic","type-topic","status-closed","hentry","topic-tag-structural-analysis"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["182286","240"],"_bbp_author_ip":["66.198.8.115"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["463"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["217268"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","182286"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["217809"],"_bbp_last_active_id":["217809"],"_bbp_last_active_time":["2022-07-06 07:48:17"]},"test":"kamalkrishna"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/217268","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\/217268\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=217268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}