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where
W
i
C.
Then, the derivative of the Lyapunov function is negative if
P
¼
ð
P
þ
SC
Þ
A
i
T
T
2
I
þ e
1
P
þ P þ ec
ð
P
þ
SC
Þð
P
þ
SC
Þ
0
ð
51
Þ
\
By using the Schur complement on inequality (
51
), we get (
38
).
Taking into account (
9
) and (
30
), equality (
41
) is derived from (
13
).
Similarly, using the following variable change
R
i
¼
PJ
i
ð
52
Þ
V
i
¼
PM
i
ð
53
Þ
we get equalities (
39
) and (
40
) from (
12
) and (
11
) respectively. Which ends the
proof.
3.3 Illustrative Example
In this subsection, we apply the proposed method to design a fuzzy bilinear
observer for a continuous fuzzy bilinear models subjects to unknown inputs and
unmeasurable premise variables. Consider FBM (
2
) with the following data:
2
4
3
5
;
2
4
3
5
6
10
40
1
A
1
¼
A
2
¼
5
10
01
2
5
20
00
1
2
4
3
5
;
2
4
3
5
1
0
0
0
:
6
B
1
¼
B
2
0
1
2
4
3
5
0
:
500
N
1
¼
N
2
¼
0
0
0
:
0
0
0
5
2
4
3
5
0
0
F
1
¼
F
2
¼
:
5
0
0
:
2
10
C
¼
0
0
:
11
The case study is envisaged for fuzzy bilinear models subjects to unknown
inputs where the decision variable is unmeasurable. Let consider the weighting
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