Wheelchair inverse dynamics

Hi Sarah

I have looked through the lastest version i have of the model. In
the JointsAndDriver.any file there is an issue that could cause the

In the SeatHeight driver the Reaction.Type is set to zero’s meaning
that this driver do not provide any force. They should all be one
unless you have something else to support the pelvis?

The next thing i would check is the environment ie. the wheelchair,
it should be checked that the reation.type settings on the chairs
are the same on all drivers.

In the Environment.any file i can see that in my version there is no
forces acting between the rims and the hands, since this part has
been outcommented. Naturally this needs to be swithed in again,
otherwise there is no forces acting there.

I hope some of it can be used…

Best regards
Soeren AnyBody support

— In anyscript@yahoogroups.com, “Sarah R. Sullivan”
<sarsulli@e…> wrote:
> Hi,
> Right now I have two working models of an individual propelling a
> wheelchair (well, actually only one push stroke - the hand-on/hand-
> time within the pushstroke). One model is driven kinetically, one
> driven kinematically. Ultimately, I want to combine the two models
> into one model. So I started small and have taken my
> kinematically-driven model and added a dummy segment to the right
> palm, on which I apply three-dimensional forces. I can load the
> and SetInitialConditions, and I can run a KinematicAnalysis
> through, however when I try to run an InverseDynamicsAnalysis, I
> the error message,
> “Wheelchair.Main.any(80) : Study : Muscle recruitment
> failed, simplex solver reports that solution does not satisfy all
> constraints.”
> Any suggestions as where to start and what might possibly be the
> problem? As I said, the two models I started with are not exactly
> same model, however both are working when I try them individually.
> Thanks,
> Sarah