Defining the "BallJoint" crashing the OpenSim

[pavan guled]

Hi all,
Actually, issue is when i define "BallJoint" between 2 bodies (link and end-effector of a manipulator) the opensim is getting crash. can anyone help me with solving this issue. And one more is ,can i find the IK of the manipulator which is imported?

Thanks and regards,
Pavan G

[Thomas Uchida]

Actually, issue is when i define "BallJoint" between 2 bodies (link and end-effector of a manipulator) the opensim is getting crash. can anyone help me with solving this issue.

Please provide more information: what model are you using, how are you adding the joint, what's the error, etc.

[pavan guled]

NCapture.JPG (48.73 KiB) Viewed 384 times

Referring to the figure above,i'm trying to define Ball joint at "B" ,but when i load the model, software getting crash. And both the rigid bodies are simple bodies with mass, inertia . But i defined "CustomJoint" ,it's okay now.

[pavan guled]

Hi Thomas,
And one more, is it possible to find the IK of that manipulator or in other way ,moving that manipulator finding reaction forces on the hand muscles (where, end-effector and hand are PointConstrained).

Thanking You,
Pavan G

[Thomas Uchida]

is it possible to find the IK of that manipulator or in other way ,moving that manipulator finding reaction forces on the hand muscles (where, end-effector and hand are PointConstrained).

It sounds like the problem you have described would be indeterminate. Prescribing only the motion of the robot would be insufficient to compute muscle forces in the model because the model could be pushing against the robot with any arbitrary force.

[pavan guled]

Hi Thomas,
Thanks for that, could you please tell me how can i go forward to do that task. Sorry for all small questions.

Thanking you