Hopefully this will reach you. I have no problem downloading the yousendit as a
.zip. Weird.
To: anyscript@yahoogroups.com
From: support@anybodytech.com
Date: Fri, 8 Feb 2008 15:16:26 +0000
Subject: [AnyScript] Re: Driving model with input moments
Hi
There is a problem with the files you uploded: it open as a sit file
and cannot be rename to zip. So it is not possible to look at it.
Can you please try to load it again in .zip so that we can have a
look at it and answer you.
Best regards.
Sylvain, AnyBody support
— In anyscript@yahoogroups.com, “chrisjgatti” <cjgatti@…> wrote:
>
> I think I have an arm model working the way I intend, however I am
> not sure how to ensure that I have done things correctly.
Basically,
> I want to apply local external moments (wrt to the humeral
coordinate
> system) so that the model must apply equal and opposite internal
> moments. For example, if I want the model to perform shoulder
> flexion, the applied external moment should essentially attempt to
> force the model into shoulder extension. For all of the analyses,
the
> model will remain in a static posture.
>
> In order to do this, I did as suggested: (1) changed the mannequin
> file (adding input moments to the local humeral coordinate system
> with AnyForce and AnyKinRotational), (2) changed the
> JointsAndDrivers.any file to that from the FreePostureMove
version,
> and (3) modified the InitialPositions.any file.
>
> I tried to validate the imposed moments by applying a singal
external
> force to the humerus at a known distance from the humerus
coordinate
> system center, and then comparing muscle force predictions.
However,
> as I understand, using AnyForce with AnyKinRotational applies a
> moment between segments…so I don’t think this is the same as
simply
> applying an external force.
>
> Could John or Soren check this out and see if I have done what I
> intend? I have uploaded the files (cjg_ArmModel); they should work
if
> they are just added to a folder inside ARep/Aalborg/. The input
file
> has external moments of shoulder extension and then shoulder
flexion,
> so that the model simulates shoulder flexion and then shoulder
> extension.
>
> Thanks for all your help,
>
> Chris
>
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