Biomedical Engineering Reference
In-Depth Information
1
1
0
0
II
0
500
1000
1500
2000
0
500
1000
1500
2000
-1
-1
I
II
I
-2
-2
-3
-3
-4
-4
Time (ms)
(a) Measured voltage and fitted curve
at F o = 150 N and t o = 250 ms
Time (ms)
(b) Measured voltage and fitted curve
at F o = 150 N and t o = 500 ms
1
1
0
0
0
500
1000
1500
2000
0
500
1000
1500
2000
II
II
-1
-1
I
I
-2
-2
-3
-3
-4
-4
Time (ms)
(c) Measured voltage and fitted curve
at F o = 150 N and t o = 1000 ms
Time (ms)
(d) Measured voltage and fitted curve
at F o = 100 N and t o = 250 ms
1
II
0
0
500
1000
1500
2000
I
-1
-2
-3
-4
Time (ms)
(e) Measured voltage and fitted curve
at F o = 50 N and t o = 250 ms
FIGURE 9.12
Fitting functions with different F o and t o for sample no. 1 (I: fitting results; II: measured results).
relaxation) during load holding. Equation (9.1) represents the fitting function
for the measured piezovoltage V ( t ):
β
t
d
()
()
τ
(9.1)
Vt
=
KF te
where
t is time
F ( t ) is the load function
K is a proportional coefficient between load F ( t ) and piezovoltage
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