Hi,
I am trying to make an optomization study where the design variable
(i.e. the one being varied) is the strength of a muscle. I have used
the same approach that the ‘Parameter studies and optimization’
tutorials used to create design variables from the bicycle seat
position parameters. However, when I make muscle force (in the muscle
model) the design variable, the model won’t load. It has something to
do with the moment of evaluation, and the errors say that F0 cannot be
evaluated at moment ‘Const’, and that MuscleStrength will not be ready
for evaluation until moment ‘DesignVar’.
I will be grateful for any advice on how to resolve the moment of
evaluation issue, or another way to set up the study.
Thanks,
Dennis
Hi Dennis
Here is the explanation:
Before version 2 all objects where constants, but in version 2 the system
distinguish between objects which are constants and objects which can be
design variables. It seems that in this transition F0 has not been allowed
to be a design variable, but there appear to be no apparent reason why this
should not be possible.
It is not possible to avoid the problem by for example multiplying a new
design variable on F0, the system will then detect that F0 is not constant
anymore. The only option you have currently is to do the optimization
outside AnyBody by making an include file with your design variables like
F0.
So unfortunately there is not much you can do to about this, we will try to
change this for the next release, we will notify you on the progress on this
shortly.
Best regards
Søren, AnyBody Support
From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of Dennis Anderson
Sent: 4. oktober 2006 20:35
To: anyscript@yahoogroups.com
Subject: [!! SPAM] [anyscript] Muscle Optimization Study
Hi,
I am trying to make an optomization study where the design variable
(i.e. the one being varied) is the strength of a muscle. I have used
the same approach that the ‘Parameter studies and optimization’
tutorials used to create design variables from the bicycle seat
position parameters. However, when I make muscle force (in the muscle
model) the design variable, the model won’t load. It has something to
do with the moment of evaluation, and the errors say that F0 cannot be
evaluated at moment ‘Const’, and that MuscleStrength will not be ready
for evaluation until moment ‘DesignVar’.
I will be grateful for any advice on how to resolve the moment of
evaluation issue, or another way to set up the study.
Thanks,
Dennis
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