{"id":32293,"date":"2018-12-23T15:52:51","date_gmt":"2018-12-23T15:52:51","guid":{"rendered":"\/forum\/forums\/topic\/rigid-body-dynamics-simulation-with-non-linear-stiffness-and-friciton\/"},"modified":"2018-12-23T15:52:51","modified_gmt":"2018-12-23T15:52:51","slug":"rigid-body-dynamics-simulation-with-non-linear-stiffness-and-friciton","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rigid-body-dynamics-simulation-with-non-linear-stiffness-and-friciton\/","title":{"rendered":"Rigid body dynamics simulation with non-linear stiffness and friciton"},"content":{"rendered":"

Hi everyone!<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

I need to simulate a two-link structure connected by hinges which allow rotation in Z-direction in the Rigid Body Dynamics module with all the bodies considered rigid. I want to prescribe an input rotation to the revolute joint connected to the ground and observe the resulting moments and behaviour of the structure.<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

In order to make the simulation more realistic, I want to include nonlinear stiffness characteristic of the joints and I also want to include the friction in joints. Revolute joint supports friction, but only a single value for joint stiffness.<\/p>\n

<\/p>\n

So far, I have managed to implement the nonlinear stiffness characteristic by using the general joint with all DOFs but rotZ fixed between a dummy rigid body and the actual link scoped by remote point. I will then apply the input rotation condition to the rigid cylinder and the rotation will transfer to the actual link as a moment including the nonlinear stiffness. Problem is, that if I use the general joint instead of a revolute joint, I lose the option of specifying a friction to the joint.<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

I also tried to use a torsional spring instead of a general joint which would allow me to input friction in the revolute joint, but the torsional spring does allow only a single value for stiffness.<\/p>\n

<\/p>\n

Do you have any idea how to implement the friction and nonlinear stiffness characteristics together?<\/p>\n","protected":false},"template":"","class_list":["post-32293","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["4465"],"_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":["1344"],"_bbp_subscription":["238239"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["32293"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","161366"],"_bbp_voice_count":["2"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["75090"],"_bbp_last_active_id":["75090"],"_bbp_last_active_time":["2019-01-16 14:08:30"]},"test":"mordrag"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/32293","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\/32293\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=32293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}