Biomedical Engineering Reference
In-Depth Information
HS
FF
HS
0.08
HO
TO
0.06
Predicted
Literature
0.04
0.02
0.00
0 0 0 0 0 0 0 0 0 0 0
-0.02
% Gait Cycle
-0.04
HS
FF
HO
TO
HS
0.14
0.12
0.10
Predicted
Literature
0.08
0.06
0.04
0.02
0.00
0 0 0 0 0 0 0 0 0 0 0
-0.02
-0.04
% Gait Cycle
-0.06
FIGURE 7.18
Joint torque profiles for a stride.
7.12 Cause and effect
The most important aspect of a human simulator is the ability to study tradeoffs,
cause and effect. One such aspect is the loading of a human model with various
types of loads at various locations. The intent is to see the effect on the human's bio-
mechanics, in this case walking.
Consider the case where humans carry loads on their backs while walking. We
shall assume a walking velocity V
0.6 m. The
load is considered as a point load applied on the back in the downward vertical
direction. Although this load model is relatively simple, it is used to study cause
and effect during the gait cycle. Three cases are simulated with varying load
weights of 20 lbs, 40 lbs, and 80 lbs. 3D stick diagrams of the walking motion are
compared in Figure 7.20 . The walks of Santos s using predictive dynamics for no
1.2 m/s and a step length L
5
5
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