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Panagiotis Artemiadis
09-06-2004, 09:02 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 am in the need of the moment of inertia value of the
forearm-hand segment of the human uuper limb.

I have computed this by using the equations provided in the
book of David Winter : Biomechanics and Motor Control of Human Movement.
But the value I have reached up is 0.23 Kgm^2, which I think is
much greater than I have came up in other papers.

I would like to ask you if you can inform me if this value
it's ok , and if you can, send me the right value.

If you can, I would be very gratefull to receive from you
the above papers:

Zatsiorsky, V. and Selujanov V. (1983) The mass and inertia
characteristics of the man segments
of the human body. Biomechanics YIII-B (Eds.=A0 Matsui, H., and Kobayashi K.)
pp. 1151-1159. Human Kinetic Publishers, (Ok, I know its a book, but
do you have it all or this portion (pp 1151-1159) in pdf format?)

Walsh E. G. & Wright G. W. (1987a) 'Inertia, resonant frequency,
stiffness and kinetic energy of the human forearm.' Quarterly Journal
of Experimental Physiology, 72, 161-170.

Finally I would like to ask another question.

As I am building a dynamic model of the human forearm-hand,
I would like to know if I have to add friction on the elbow
joint (flexion-extension is the only degree of freedom I am
interestd in for now). And if I must do it, is it like:
Friction = K * q_dot, where q_dot is the angular velocity
of the moving forearm-hand?
And what is the value of the constant K?

Thanks in advance for your help,


Panagiotis Artemiadis


*****************************************
Panagiotis K. Artemiadis
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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