[IEEE 2008 Chinese Control and Decision Conference (CCDC) - Yantai, Shandong, China...
5
1481 978-1-4244-1734-6/08/$25.00 c 2008 IEEE
Transcript of [IEEE 2008 Chinese Control and Decision Conference (CCDC) - Yantai, Shandong, China...
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1481
978-1-4244-1734-6/08/$25.00 c© 2008 IEEE
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′
′ ′ −= =
′ ′ −
′
′ + −
α
=
<
α
α = −
α
ω
ω π
ωω
ωω ω π
=
=
ω λ
λω ω
ω ωω ω ω ω ω
+
=
1482 2008 Chinese Control and Decision Conference (CCDC 2008)
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ω
α α
γ
γλ
α ω α+
= =
=
γ
γ
γ λ
ω α+
=
==
= −
− +
δ
α
δδ +
δα= ω ω ω=
δ= = +
δ +
=
= + =
=
= + − −
=
= + =
=
= +
= =
= −
μ −Δ = +
μ
ω
0 1 2 3 4 5 6 7 8 9 10
-140
-120
-100
-80
-60
-40
-20
Frequency/kHz
Pre
ssur
e ga
in/d
B
Signals of 3 generalized cosine window functions
HammingHanningBlackman
0 5 10-100
-80
-60
-40
-20
0
Pre
ssu
re g
ain/
dB
Hamming
0 5 10-150
-100
-50
0
Frequency/kHz
Hanning
0 5 10-150
-100
-50
0
Blackman
2008 Chinese Control and Decision Conference (CCDC 2008) 1483
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0 5 10 15 20-140
-120
-100
-80
-60
-40
-20
0
Frequency/kHz
Sou
nd p
ress
ure
leve
l/dB
0 2000 4000 6000 80000
0.2
0.4
0.6
0.8
1
1.2
1.4
Frequency/Hzab
sorp
tion
coef
ficie
nt
material samples
equivalent output
α
0 2 4 6 8 10 12 14 16 18 20-100
-90
-80
-70
-60
-50
-40
-30
Frequency/kHz
Son
ud P
ress
ure
Leve
l/dB
Before Exciter
After Exicter
0 2 4 6 8 10 12-100
-90
-80
-70
-60
-50
-40
-30
-20
Frequency/kHz
Son
ud P
ress
ure
Leve
l/dB
Before Equalizer
After Equalizer
0 5 10 15
-100
-80
-60
-40
-20
Local Thrust
Rated & Overload
0 5 10 15
-100
-80
-60
-40
-20
Sou
nd p
ress
ure
leve
l/dB
Rated F spectrum
BP network output
0 5 10 15
-100
-80
-60
-40
-20
Frequency/kHz
Overload F spectrum
BP network output
1 2 3 4 5 6 70
20
40
60
80
100
Octave band/Back
Abs
olut
e pr
essu
re g
ain/
dB
1 2 3 4 5 6 70
20
40
60
80
Octave band/Back
0 5 10 15
-100
-80
-60
-40
-20
4 nerval cells in BP output layer
BP output
Verified dots
0 5 10 15
-100
-80
-60
-40
-20
Frequency/kHz
S
ound
pre
ssur
e le
vel/d
B
6 nerval cells in BP output layer
1484 2008 Chinese Control and Decision Conference (CCDC 2008)
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2008 Chinese Control and Decision Conference (CCDC 2008) 1485
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