Search found 19 matches
- Thu Mar 06, 2014 1:44 pm
- Forum: OpenSim
- Topic: Setting the system state in a model with constraints
- Replies: 1
- Views: 677
Setting the system state in a model with constraints
Hi, I've been trying to use the API to compute moment arms for my musculoskeletal model for different values of the generalized coordinates. Out of around 15 dofs in the model, only 4 are truly independent and each of the remaining 11 are functions of one of the 4, linked through a 'CoordinateCouple...
- Wed Jun 26, 2013 5:09 am
- Forum: Matlab-Opensim Interfaces
- Topic: Creating wrapping surfaces
- Replies: 1
- Views: 734
Creating wrapping surfaces
I am trying to read an opensim model described in a .osim file into MATLAB, and then add a wrapping ellipsoid to the same. % I first initialize an empty WrapEllipsoid object W = WrapEllipsoid(); However beyond this point, I am not sure how to specify the dimensions, translation and XYZ rotation of t...
- Thu Aug 04, 2011 5:10 pm
- Forum: OpenSim
- Topic: Exporting SIMM files in OpenSIM
- Replies: 3
- Views: 1142
RE: Exporting SIMM files in OpenSIM
I am using version 2.2.1. All earlier versions seem to export the "moving muscle points" as fixed points when converting into the SIMM format. This leads to unreasonably high passive forces the affected muscles due to over-stretching. Thanks!
- Thu Aug 04, 2011 6:43 am
- Forum: OpenSim
- Topic: Exporting SIMM files in OpenSIM
- Replies: 3
- Views: 1142
Exporting SIMM files in OpenSIM
<t>When I export the gait2354.osim model into the corresponding joint and muscle files (Using OpenSIM version 2.2.1), SIMM fails to read in the muscles with "Moving Muscle points" such as the rectus femoris and the vastus. Is there some edit to the muscle file I could manually perform, so that these...
- Fri Apr 22, 2011 12:37 pm
- Forum: OpenSim
- Topic: External loads in CMC
- Replies: 1
- Views: 460
External loads in CMC
<t>Hi,<br/> One of the settings for CMC requires the user to specify a file containing "Kinematics for External Loads". This is by default always the IK motion file. I presume this has something to do with specifying Ground reaction forces during walking, since CMC does not use a ground contact mode...
- Mon Jun 28, 2010 9:10 am
- Forum: OpenSim
- Topic: Reserve actuators in CMC
- Replies: 0
- Views: 276
Reserve actuators in CMC
<t>Hi,<br/> <br/> I was looking at how the reserve actuators work during CMC. It seemed like although their excitations remained constant during a time step (T=<t<T+0.01) the reserve actuator forces took on a different value at the start of the timestep (i.e at t=T). <br/> <br/> My understanding is ...
- Thu Oct 22, 2009 7:18 am
- Forum: OpenSim
- Topic: Inertia matrices reported in OSIM file....
- Replies: 0
- Views: 264
Inertia matrices reported in OSIM file....
Hi,
The moment of inertia tensors for each body segment are reported in the osim file. Are these values taken w.r.t the center of mass of the body segment or the origin of the body frame??
Thanks
Ananth
The moment of inertia tensors for each body segment are reported in the osim file. Are these values taken w.r.t the center of mass of the body segment or the origin of the body frame??
Thanks
Ananth
- Thu Sep 24, 2009 10:45 am
- Forum: OpenSim
- Topic: constraints on CMC cost function....
- Replies: 0
- Views: 324
constraints on CMC cost function....
Hi,
During static optimization in CMC, how many equations are used as constraints on the cost function??
Regards
Ananth
During static optimization in CMC, how many equations are used as constraints on the cost function??
Regards
Ananth
- Wed Sep 16, 2009 8:45 am
- Forum: OpenSim
- Topic: How can I see the joint moment?
- Replies: 12
- Views: 2811
RE: How can I see the joint moment?
Are you referring to the 'joint moment' (Moment required to actuate the joint) or the 'joint reaction moment' (Moment of forces at joint contact, about the joint center)???
For joint reaction moment, you would have to use the 'JointReaction' analysis from the analyze toolbox.
For joint reaction moment, you would have to use the 'JointReaction' analysis from the analyze toolbox.
- Tue Sep 15, 2009 11:29 am
- Forum: OpenSim
- Topic: JointReaction analysis.....
- Replies: 4
- Views: 989
RE: JointReaction analysis.....
<t>Thanks Matt,<br/> <br/> But the RRA states file only contains the joint coordinates and their velocities. So shouldn't we include the RRA controls file so that the values of the residual forces and joint actuators are known?? ..... and these would affect the values of the joint reaction forces. <...