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Final slop is 20 (db/dec),
the difference of orders (Den.Num.) is 1.
Phase angles: +90
±
0
±
90. We have 1 “zeros” 2 “ploes”.
Besides, the starting
angle is +90, therefore, the “zeros” has “0” real part.
From the peak and the arrow, we know the damping ratio is less than 0.707 and it
is actually
1
.
0
2245
x
(by comparing the arrow to the given reference plot).
From 0 degree crossing (“+90” + “90” crossing), we know
7
2245
n
w
(rad/sec).
The Transfer Function should have the form as:
+
+
1
2
2
2
2
n
n
n
S
S
S
K
w
x
w
w
.
For
n
w
w
<<
=
1
.
0
,
2
2
2
2
7
2
.
0
7
1
log
20
)
log(
20
)
7
log(
20
log
20
+


+
≡
w
w
w
K
FRF
)
(
34
20
)
7
log(
20
)
1
log(
20
)
1
.
0
log(
20
)
7
log(
20
2
2
db
K
K

2245

≡

+
2245
8
.
9
),
(
14
)
7
log(
20
2
2245
⇒

=
K
db
K
.
49
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This document was uploaded on 07/08/2011.
 Spring '09

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