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Old 07-25-2017, 10:11 AM
Xiao Yiba Xiao Yiba is offline
Junior Member
Join Date: Mar 2017
Posts: 3
Smile FDK errors of Kinematic analysis failed in time step 0

Hello guys,
I tried to implement FDK features to the ankle-joint.
Firstly, I chose only one DOF for FDK which is the rotation of Z, like this:
[IMG]C:\Users\Administrator\Desktop\anybody 截图\DOF[/IMG]
And it runs well but the AnkleForceDep is too high. I want know how I can reduce the ankle force.
Secondly, when I choose another DOF which is the rotation of Y, it have many errors like this:
[IMG]C:\Users\Administrator\Desktop\anybody 截图\errors[/IMG]
I want to know what can I do to run the FDK.
Thanks for your effort .
Xiao Yiba
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Old 07-27-2017, 02:35 PM
mkjung9980's Avatar
mkjung9980 mkjung9980 is offline
Senior Member
Join Date: Aug 2009
Posts: 893

Dear Xiao Yiba,

It will be nice if you can let us know your information(organization name, lab name and so on) as well as your working environment( AnyBody version ).

Also if you want to get our advice, then please post on the general forum:

I dont know how you implement some necessary elements near your ankle joint but there are something that we can think of in order to implment the FDK degrees of freedom in the ankle joint.

You need to define prpoer contacts between bone geometries as well as some stiffness around the ankle joint. If you don't prepare these elements, then solving FDK is not easy.

Also at the moment, we don't have any reference (literatures) which are relevant for your research.

If you can upload your model in the forum's debug section, then we may try to have a look at it.


P.S) Please write only one post at a time so that we are not confused with multiple posts.

Moon Ki Jung, Ph.D, Application Engineer, AnyBody Technology A/S.

※ AnyScript™ Reference Manual is the bible.
※ AnyScript™ wiki page is the best supplementary information(
※ When you would upload your models, please write information about your AMS and AMMR versions.
※ If you want to get more intensive support, please update your information(profile, organization and signature).
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