{"id":50302,"date":"2020-12-02T21:36:02","date_gmt":"2020-12-02T21:36:02","guid":{"rendered":"\/forum\/forums\/topic\/supercritical-jeffcott-rotor-transient-analysis-workbench\/"},"modified":"2020-12-02T21:36:02","modified_gmt":"2020-12-02T21:36:02","slug":"supercritical-jeffcott-rotor-transient-analysis-workbench","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/supercritical-jeffcott-rotor-transient-analysis-workbench\/","title":{"rendered":"Supercritical Jeffcott Rotor Transient Analysis &#8211; Workbench"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi, I am trying to run an undamped Jeffcott rotor at speeds (1700-2000 rad\/sec) above my critical speed (which is around 1070 rad\/sec), but the support loads are unreasonably high (6000kN) in my transient analysis. Deformations are also unreasonably high. Below or slightly under critical speed they seem reasonable. I have tried modifying the majority of available parameters (ramping up the rotational velocity vs starting at high speed, decreasing the timestep, modifying internal damping, using line vs. solid models). The main reason for running the analysis in transient is to eventually estimate the bearing loads, including damping forces. Which analysis settings are important to include for supercritical rotors? <\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/N3IB2TWL3RCW\/ansys-help-png.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/N3IB2TWL3RCW\/ansys-help-png.png\" alt=\"ansys_help.PNG\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-50302","topic","type-topic","status-closed","hentry","topic-tag-ansys-mechanical","topic-tag-rotor-dynamics","topic-tag-transient-structural","topic-tag-workbench"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["22548"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["CG\u001fr"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1248"],"_bbp_subscription":["231382"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["50302"],"_bbp_forum_id":["27791"],"_bbp_engagement":["20905","183816","184756"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["138258"],"_bbp_last_active_id":["138258"],"_bbp_last_active_time":["2021-01-10 17:42:56"]},"test":"dbruneau"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/50302","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\/50302\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=50302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}