Biomedical Engineering Reference
In-Depth Information
convenience, when simulating the behavior of the system for the pre-acting
control, shift the time scale so that the beginning of the control is zero, that
is, instead of Eq. (8.14), use the expression
−
7
.
0g,
0
≤
t
≤
0.194 s,
u
0
(t)
=
(8.19)
0,
t >
0
.
194 s.
8.3.6
Results
The simulation results are presented in Figs. 8.4, 8.5, and 8.6. Figures 8.4
and 8.5 present the values of the response criteria
J
2
,...,J
14
(there is a
separate diagram for each criterion) defined by the standards as critical (first
bar) and the calculated values for the system with the wheelchair attached to
the vehicle body (second and third bars), for the wheelchair on an isolated
platform controlled without pre-action (fourth bar), and for the wheelchair
J
10
Thorax
J
11
Neck
80
1.2
1
60
0.8
40
0.6
0.4
20
0.2
0
0.0
1
2
3
4
5
1
2
3
4
5
J
12
Neck
J
13
Neck
5
5
4
4
3
3
2
2
1
1
0
0
1
2
3
4
5
1
2
3
4
5
J
14
Tiedown
40
30
20
10
0
1
2
3
4
5
FIGURE 8.5
Response criteria
J
10
-
J
14
for a wheelchair attached to a vehicle body and
a wheelchair attached to an isolated platform.
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