Environmental Engineering Reference
In-Depth Information
Hence,
b 1 z
1
b 2 z
1
b 3 z
1
b 4 z
1
z 1
z 1
z 1
z 1
G 1
(
)=
G 2
(
)=
G 3
(
)=
G 4
(
)=
z 1
z 1
z 1
z 1
A
(
)
A
(
)
A
(
)
A
(
)
(4.41)
and
1
z 1
H
(
)=
) .
(4.42)
A
(
z 1
From (4.26), (4.41), and (4.42),
1
1
z 1
T u
y
(
t
|
t
1
)=
G
(
)
(
t
)+[
)
1
]
y
(
t
),
(4.43)
z 1
z 1
A
(
)
A
(
y
(
t
|
t
1
)=−
a 1 y
(
t
1
)−
a 2 y
(
t
2
)−
a 3 y
(
t
3
)+
b 1 u 1
(
t
1
)
(4.44)
+
b 2 u 2
(
t
1
)+
b 3 u 3
(
t
1
)+
b 4 u 4
(
t
1
)
(
|
)=−
(
)−
(
)−
(
)+
(
)
y
t
t
1
a 1 y
t
1
a 2 y
t
2
a 3 y
t
3
b 1 u
t
1
(4.45)
u
(
t
1
)
b 2 u 2
+
(
t
1
)+
b 3
u
+
b 4 l
(
t
).
3
(
t
1
)
Hence,
u
(
t
1
)
u 2
T
u
ϕ
(
t
)=[−
y
(
t
1
) −
y
(
t
2
) −
y
(
t
3
)
u
(
t
1
)
(
t
1
)
l
(
t
)]
3
(
t
1
)
(4.46)
ϕ T
(
|
)=
(
)
and y
t
t
1
t
θ is LIP vector
T
θ
=[
a 1 a 2 a 3 b 1 b 2 b 3 b 4
]
(4.47)
even though it is nonlinear in the plant input u
(
t
)
.
Example 3. Let the assumed plant model be the same as that of Example 2, ex-
cept that parameter b 5 is unknown, and must be estimated along with the other six
parameters. Then
b 2 u 2
y
(
t
)=−
a 1 y
(
t
1
)−
a 2 y
(
t
2
)−
a 3 y
(
t
3
)+
b 1 u
(
t
1
)+
(
t
1
)
u
(
t
1
)
u
+
b 3
) +
b 4 l
(
t
)+
w
(
t
)
(4.48)
b 5
(
t
1
and in view of (4.48)
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