Inverse dynamics
Posted: Mon Aug 27, 2012 6:21 am
Hi,
My group and I are working on a musculoskeletal model of the spine in opensim. We are all fairly beginner here and have been running through the tutorials, looking at the confluence web-site etc.
We have a generalized model developed from the literature, and as a result we do not have external load data, such as force plates, etc.
In fact the model does not go to the feet, but stops at the pelvis.
We are attempting to solve an inverse dynamics problem and determing the internal loads/torques at the joints of the spine. We are able to do so, but have left "unchecked" the external load tab, because we do not have external loads.
Is our output of internal forces/torques just junk because we do not have applied forces? Without applied forces how is it even able to solve at all? The only thing I can think of, is that gravity is incorporated through the center of mass and is the applied force.
Any help is appreciated.
Thanks
My group and I are working on a musculoskeletal model of the spine in opensim. We are all fairly beginner here and have been running through the tutorials, looking at the confluence web-site etc.
We have a generalized model developed from the literature, and as a result we do not have external load data, such as force plates, etc.
In fact the model does not go to the feet, but stops at the pelvis.
We are attempting to solve an inverse dynamics problem and determing the internal loads/torques at the joints of the spine. We are able to do so, but have left "unchecked" the external load tab, because we do not have external loads.
Is our output of internal forces/torques just junk because we do not have applied forces? Without applied forces how is it even able to solve at all? The only thing I can think of, is that gravity is incorporated through the center of mass and is the applied force.
Any help is appreciated.
Thanks