MECHANICAL WORK, ENERGY, AND POWER - Biomechanics and Motor Control of Human Movement - page 171

Table A.2 a , hip velocities,

V xh = V yh = 1 . 36 m/s 0 . 27 m/s

Table A.2 b , knee velocities,

V xk = 2 . 61 m/s V yk = 0 . 37 m/s

Table A.2 c , ankle velocities,

V xa = 3 . 02 m/s V ya = 0 . 07 m/s

Table A.3 b , leg angular velocity,

ω lg = 1 . 24 rad/s

Table A.3 c , thigh angular velocity,

ω th = 3 . 98 rad/s

Table A.5 a , leg segment reaction forces and moments,

= =

F xa =− F ya =

F xk 15 . 1N, F yk 14 . 6N, 12 . 3N, 5 . 5N,

M a =− 1 . 1N · m M k = 5 . 8N · m

Table A.5 b , thigh segment reaction forces and moments,

=− =−

F xh =−

=

F xk 15 . 1N, F yk 14 . 6N, 9 . 4N, F yk 102 . 8N,

M k =− 5 . 8N · m, M h = 8 . 5N · m

Table A.6, leg energy,

E lg ( frame 6 ) = 20 . 5J, E lg ( frame 4 ) = 20 . 0 J

Table A.6, thigh energy,

E th ( frame 6 ) = 47 . 4J, E th ( frame 4 ) = 47 . 9 J

1. Leg Power Balance

powers = F xk V xk + F yk V yk + M k ω lg + F xa V xa + F ya V ya + M a ω lg

= 15 . 1 × 2 . 61 + 14 . 6 × 0 . 37 + 5 . 8 × 1 . 24 − 12 . 3

× 3 . 02 + 5 . 5 × 0 . 7 − 1 . 1 × 1 . 24

= 44 . 81 + 7 . 19 − 33 . 3 − 1 . 36
=

17 . 34 W