Sorry to both you again, but just when you thought you were done with me…
I thought of another question! 
When I get joint force outputs from the path I mentioned below (or similarly for
the elbow), what coordinate frame are the Fx, Fy, and Fz in? For example if my
wrist joint outputs are:
{-109.9579, -33.0558, 9.893213, 0.3731783},
Are the forces in reference to the hand or radius? And likewise for the elbow
joint, are the resulting forces in reference to the humerus or ulna reference
frame?
I feel like this should be inherent, but I am a bit confused…
As always, thanks for your help,
Sarah
-----Original Message-----
> Date: Mon Jul 16 06:45:00 EDT 2007
> From: “AnyBody Support” <support@anybodytech.com>
> Subject: [AnyScript] Re: Wrist Muscle Question
> To: anyscript@yahoogroups.com
>
> Hi Sarah
>
> To me it sounds all right:)
>
> Best regards
> Christian, AnyBody Support
>
> — In anyscript@yahoogroups.com, “Sarah R. Sullivan” <sarsulli@…>
> wrote:
> >
> >
> > Thanks for your help, I really appreciate it. I think I understand
> where to now find joint forces and moments. Just to clarify though,
> when I go to the model tree and follow the following path and
> double-click on Fout:
> >
> > Main --> MyArm --> HumanModel --> Right --> ShoulderArm --> Jnt -->
> WristJoint --> Constraints --> Reaction --> Fout
> >
> > I get an output of: {-109.9579, -33.0558, 9.893213, 0.3731783};
> >
> > So the first three numbers are the Fx, Fy, and Fz at the wrist
> joint, and the fourth number is the moment. If this is the case, I am
> assuming that these outputs are in local coordinates, correct? To
> view these outputs in global coordinates, I can just change the Ref in
> the BRep Jnt file, right?
> >
> > Thanks again for your help,
> > Sarah
> >
> >
> >
> >
> > -----Original Message-----
> >
> > > Date: Wed Jul 11 04:42:26 EDT 2007
> > > From: “AnyBody Support” <support@…>
> > > Subject: [AnyScript] Re: Wrist Muscle Question
> > > To: anyscript@yahoogroups.com
> > >
> > > Hi Sarah
> > >
> > > It is a good question.
> > >
> > > The muscle forces you get is the wrist moments not forces, so the
> > > numbers you have listed are the moments generated by AnyGeneral
> > > muscles attached to the wrist joint.
> > >
> > > The wrist joint has been equipped with moment generating
> > > AnyGeneralMuscles because there are currently no ordinary muscles
> > > spanning this joint in the model, in the file “WristMuscle.any” you
> > > can see how it was implemented. It is done using AnyGeneralMuscles
> > > if these are applied to a linear measure they supply force and if
> > > applied to a rotational measure they supply moment. These moment
> > > generating muscles is determined as a part of the normal muscle
> > > recruiment problem.
> > >
> > > In the joint folder you can find the wrist joint and her you will
> > > find a universal joint with three reactions forces and one moment
> > > reaction available.
> > >
> > > If you have supplied your force directly to the hand segment you do
> > > not need to think about the glove segment since it will be unloaded
> > > and could essentially be removed from your model i guess.
> > >
> > > I hope this made things more clear, otherwise please ask again
> > >
> > > Best regards
> > > S�ren, AnyBody Support
> > >
> > > — In anyscript@yahoogroups.com, “Sarah R. Sullivan” <sarsulli@>
> > > wrote:
> > > >
> > > > Could someone just refresh my memory as to how the wrist muscle
> > > file works exactly? I am currently applying a force to the palm
> > > joint of: (-82.3, 82.14, 21.2) Newtons. If I have a scenario where,
> > > after running the inverse dynamics analysis, my outputs at a
> > > particular time are as follows (obviously when I change my force
> > > input, the resulting muscle forces changes):
> > > >
> > > > WristFlexionMuscle = 2.16509
> > > > WristExtensionMuscle = 0.0
> > > > WristAdductionMuscle = 1.317015
> > > > WristAbductionMuscle = 0.0
> > > >
> > > > Does this mean that at the wrist joint there is an x-direction
> > > force of 2.16509, and a y-direction force of 1.317015? Is this in
> > > global or local? Where is the z-direction force - there is a z-
> > > force input? What I am trying to do is calculate the joint forces
> > > (by hand) according to the muscle outputs, and compare these results
> > > to the joint reaction forces calculated by AnyBody. However, I get
> > > stuck right at the beginning because I can?t quite figure out how
> > > the wrist muscle is ?attached? or how the wrist joint force is being
> > > calculated. And does the glove folder have anything to do with what
> > > I?m looking at? I?m not really ?gripping? anything so I haven?t
> > > even investigated the glove folders?
> > > >
> > > > I hope this isn?t a dumb question, I?m just a little confused?
> > > >
> > > > Thank you for all your help,
> > > > Sarah
> > > >
> > >
> > >
> >
>
>