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08-31-2004, 11:50 PM
Dear Sirs,

I am working on my PhD on the Control System Laboratory
of the Mechanical Engineering Department of the National
Technical Universoty of Athens, Greece.

I would like to ask some questions
about muscle and generation of force.

I would like to use the Hill-model
which constitutes of a Contractile Element
(CE), a Series Elastic Element (SE) and a
parallel element (PE).
First of all I would like to pose those questions:

CE corrresponds to muscle fiber,
SE to tendon and PE to other
passive elements??

Additionally, I have a question about the
lengths of these elements. I have the following
data for biceps (long) muscle:

Lmt (max) = 41.94 cm, max musculotendon length
Lmt (min) = 26.06 cm, min musculotendon length
LoM = 15.36 cm, optimal muscle fiber length
LsT = 22.93 cm, tendon slack length

As I can understand the sum of the muscle fiber
length and the tendon length is the Lmt length.
Is this right?

My question is this:

In the value of LsT = 22.93 is the lenght of
muscle fiber included?

My question is based on the fact that I use
the above equations:

Fse = (Fsemax/(exp(SEsh) -1 ))*(exp(SEsh*dLse/dLsemax) - 1);
Fpe = (FPemax/(exp(PEsh) -1 ))*(exp(PEsh*dLpe/dLpemax) - 1);

and I wonder how can I compute the values of
dLse, dLsemax,dLpe,dLpemax, which are the extensions
of the elements SE and PE, subscript max indicates
corresponding maximal values.

I would be very gratefull if you can answer my question.

*****************************************
PhD Candidate
Control Systems Laboratory
Mechanical Eng. Dept
National Technical University of Athens
9 Heroon Polytechniou Str.,
Zografou Athens 15700, Greece
Phone : ++30 - 210 - 7723656
http://users.ntua.gr/partem/
*****************************************

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