{"id":304614,"date":"2023-09-01T20:07:48","date_gmt":"2023-09-01T20:07:48","guid":{"rendered":"\/forum\/forums\/topic\/question-about-the-definition-of-rigid-part-rotating-around-certain-location-and\/"},"modified":"2023-09-01T20:07:48","modified_gmt":"2023-09-01T20:07:48","slug":"question-about-the-definition-of-rigid-part-rotating-around-certain-location-and","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/question-about-the-definition-of-rigid-part-rotating-around-certain-location-and\/","title":{"rendered":"Question about the definition of rigid part rotating around certain location and"},"content":{"rendered":"<p class=\"MsoNormal\"><span style=\"font-size: 11.5pt;line-height: 107%;font-family: 'Open Sans',sans-serif;color: #494954;background: white\">Hello, I am writing to seek your assistance regarding to definition of rigid part rotating around certain location and axis in LS-DYNA.<\/span><span style=\"font-size: 11.5pt;line-height: 107%;font-family: 'Open Sans',sans-serif;color: #494954\"><br style=\"text-align: start\"><br style=\"text-align: start\"><span style=\"background: white\"><span style=\"text-align: start;float: none\">My task is to load an angular acceleration curve in Y axis into model and compare the results in 2 methods, the rotation center point is CG (red dot) for method 1, the rotation center point is OC (black dot) for method 2 in the below picture, the pulses are same for 2 methods.<\/span><\/span><br style=\"text-align: start\"><br style=\"text-align: start\"><span style=\"background: white\"><span style=\"text-align: start;float: none\">I created a rigid part, used *Boundary_Prescirbed_Motion_Rigid to load the curve, then Constraint_extra_nodes was added to the rigid part, the nodes are in brain.<\/span><\/span><br style=\"text-align: start\"><br style=\"text-align: start\"><span style=\"background: white\"><span style=\"text-align: start;float: none\">My problem is the method2, I created a local coordinate and VID 99, changed DOF to 8 and VID 99 in the below picture, but the output animation shows the brain rotate center point is still CG, not change to OC. No difference between method 1 and 2.<\/span><\/span><br style=\"text-align: start\"><br style=\"text-align: start\"><span style=\"background: white\"><span style=\"text-align: start;float: none\">Later, I tried to use *Part_Interia to define the mass center of the rigid part, but the result from method 2 is still the same as method 1.<\/span><\/span><br style=\"text-align: start\"><br style=\"text-align: start\"><span style=\"background: white\"><span style=\"text-align: start;float: none\">Can you please give some advice about the issue? Thanks for your help!<\/span><\/span><\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 11.5pt;line-height: 107%;font-family: 'Open Sans',sans-serif;color: #494954\"><span style=\"background: white\"><span style=\"text-align: start;float: none\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/01-09-2023-1693598835-1.png\" alt=\"\"><\/span><\/span><\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 11.5pt;line-height: 107%;font-family: 'Open Sans',sans-serif;color: #494954\"><span style=\"background: white\"><span style=\"text-align: start;float: none\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/01-09-2023-1693598850-2.png\" alt=\"\"><\/span><\/span><\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 11.5pt;line-height: 107%;font-family: 'Open Sans',sans-serif;color: #494954\"><span style=\"background: white\"><span style=\"text-align: start;float: none\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/01-09-2023-1693598860-3.png\" alt=\"\"><\/span><\/span><\/span><\/p>\n","protected":false},"template":"","class_list":["post-304614","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["292659","13694"],"_bbp_author_ip":["104.102.248.196"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1246"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["304614"],"_bbp_forum_id":["27814"],"_bbp_engagement":["13694","292659"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["307363"],"_bbp_last_active_id":["307363"],"_bbp_last_active_time":["2023-09-18 22:52:49"]},"test":"yingtaowayne-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/304614","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\/304614\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=304614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}