Suppose I am given a motion data file (say AMC) that is without the translation/rotation of the overall skeleton. If I only know the joint angles, how do I compute the overall translation and orientations of the figure? I have some idea. To calculate walking distance for example, I would need to calculate the stride length (how to determine a stride?) and the number of strides per unit time. To calculate the body orientation, I should compute the length and orientation of the leg limb at the point of foot-ground contact, and to calculate the body position during the flight phase (in running), I will need the velocity of the feet upon take-off and compute the force. But I'm interested to know if there's certain subtlety or if there is is some explanation or example calculations anywhere. Thanks.
Hello Nordin,
Seems a complex problem.
Some years ago, we looked at a simpler one elbow flexor force and angle, and force development etc. See paper below if interested.
EXPERIMENTAL NEUROLOGY 62, 595-604 (1978)
Isometric Tension Development in a Human Skeletal Muscle in Relation to Its Working Range of Movement: The Length-Tension Relation of Biceps Brachii Muscle
H. M. ISMAIL AND K. W. RANATUNGA
It should refer to an old one as well (Wilkie, 1950?).
Not sure all this is helpful.
KW
Hi Nordin,
You may refer to the following paper linked below.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1616075
The method in this project used gyrometers to measure lower limbs joint angles and calculated the temporal-spatial parameter of gait cycles.
Hope it helps!
Man
The Book by David Tittertoin "Strapdown Inertial Navigation Technology" is a very usful reference for that kind of work also.
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