Problem with edited GearStick Model

Main Forum
1

Hi

I edited the GearStick Model a little bit:confused:. I like to drive the left lower arm in a given plane (transversal plane @ glenohumeral joint). It’s more or less the same challenge like the GearStick, but the bone limiting elements (point @ elbow and point @ hand) are in the transversal plane.

I tried to adapt the model, but I got a problem with the kinematic study. I got always the same error:

Failed to resolve kinematic constraints (final kin. error = 2.416803E-006)
Constraint no. 68 above error tolerance 0.000001, error = 0.000001. - constr. #3 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Jnt.FE.Constraints’
Constraint no. 69 above error tolerance 0.000001, error = 0.000002. - constr. #4 …

I tried the controll of the driver over a separat segment and over a spherical joint and a direct driver at the Node Glove.WristContactNode.

Can you help me with that problem?

2

Please report always which Version of the AMMR and the AMS you are using. Also please prepare the model in a way that it fits to the standard given in the AMMR, so the Application is in the right folder level.
Best regards,
Sebastian

3

Okay, i changed the structure of the folders, that it fits to the application folder. I am using the AMMR 1.2 and the Anybody version 4. 2. 0

4

Hi,
thanks, that makes it way easierer to have a quick look at the model.
Basically the shoulder model is quite sensitive in 90 degree and more flexion. You could try to stay slightly below. A quick and dirty fix is to increase the kinematic tolerance. this is especially for debugging quite useful. e.g. include
Kinematics.KinematicTol = 0.0001;
in the study folder.
Gruss,
Sebastian

5

Hi Sebastian
Thanks for this tip. I changed the kinematic tolerance to 0.0001 and it works very well. Its very important for me to work with GH-flexion angles above 90 degree, because my project deals with such angles.
Thanks for your fast assistance.

Gruss Christoph

6