Hi, <\/p>\n
So, I’m working on a problem involving the human elbow joint – specifically modeling the flexion\/extension motion of the elbow joint using a revolute joint. <\/p>\n
<\/p>\n
To take advantage of the faster computational time, I’ve modeled the bones and cartilage as rigid bodies. I’ve provided body-body joint supports between cartilage and bones as fixed joints, constrained the upper arm bone as a fixed joint to the ground, and modeled the flexion\/extension joint as a revolute joint without any stiffness. <\/p>\n
I’ve modeled joint behavior as rigid.<\/p>\n
Then, I added springs with certain stiffness values to model ligaments and muscles. <\/p>\n
<\/p>\n
When I add a moment load and solve, I get an unconstrained motion. However, I’m expecting motion that is constrained by the springs. <\/p>\n
I tried changing the following but to no avail:<\/p>\n
<\/p>\n
1. Weak Springs on and off<\/p>\n
<\/p>\n
2. Large Deflection on<\/p>\n
<\/p>\n
3. Switched spring behavior from tension and compression to just tension.<\/p>\n
I also checked the solution information graphics tab after the solution was reached and noticed only the constraint equation lines show up. No springs were denoted in the solution information. <\/p>\n
I’m not sure what I’m missing but the springs are not constraining the revolute joint motion at all. Can someone please help?<\/p>\n","protected":false},"template":"","class_list":["post-35001","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["7173"],"_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"],"_btv_view_count":["1808"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["35001"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","164888"],"_bbp_voice_count":["2"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["84039"],"_bbp_last_active_id":["84039"],"_bbp_last_active_time":["2019-04-29 10:54:27"]},"test":"abhisheky"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/35001","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\/35001\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=35001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}