Abstract :In present work kinematic analysis of the human
leg determines the velocities and accelerations of the different
links of the human leg viz. Femur and tibia. In this analysis,
the velocity and acceleration diagrams for the human leg have
been performed. Later by changing the link lengths in equal
and unequal length ration has been performed for running on
a treadmill device during stance phase. The parameters for
the kinematic analysis are obtained for real time running
which can be used for gait analysis of humanoid robots,
selection of athletics etc. We can consider a human leg as a
mechanism since it has relative motion in between the links.
The major joints in a human leg mechanism are hip joint,
knee joint and ankle joint. The hip joint joins’ the femur and
spine, knee joint joins femur and tibia, ankle joint joins’ tibia
and foot. In real life there are ball and socket joints between
all these joints but in practical we can consider them as
turning pairs. The study of velocity analysis involves the
linear velocities of various points on different links of a
mechanism as well as angular velocities of the links. The
velocity analysis is prerequisite for acceleration analysis
which further leads to force analysis of various links of a
mechanism. To facilitate such study, a mechanism is
represented by a skeleton or a line diagram, commonly known
as configuration diagram. Velocities and accelerations in
machines can be determined either analytically or
graphically. Graphical analysis is more direct and is accurate
to an acceptable degree and thus cannot be neglected.