PatentPDF Available

Disk drive filtering disturbance signal and error signal for adaptive feed-forward compensation

Authors:
USOO8922938B1
(12)
United
States
Patent
(10)
Patent
N6.=
US
8,922,938
B1
Chen
et
al.
(45)
Date
of
Patent:
Dec.
30,
2014
(54)
DISK
DRIVE
FILTERING
DISTURBANCE
6,067,206
A
5/2000
Hull
et
a1.
SIGNAL
AND
ERROR
SIGNAL
FOR
2
22511110
at
$11
, ,
o
1an e
a
.
ADAPTIVE
FEED-FORWARD
6,094,020
A
7/2000
GoretZki
et
a1.
COMPENSATION
6,101,065
A
8/2000
Alfred
et
al.
6,104,153
A
8/2000
Codilian
et
a1.
(71)
Applicant:
Western
Digital
Technologies,
Inc.,
6,122,133
A
9/2000
Nazarian
et
a1.
Irvine,
CA
(Us)
6,122,135
A
9/2000
Stich
6,141,175
A
10/2000
Nazarianet
a1.
(72)
Inventors:
Xu
Chen,
San
Diego,
CA
(US);
Jianguo
6’160’368
A
12/2000
_P1utOWSkl
Zhou,
FOOIhill
Ranch,
CA
(US);
Wei
Xi,
(Con?rmed)
Mission
V1ejo,
CA
(US);
Kuang-Yang
Tu,
Irvine,
CA
(US);
Guoxiao
Guo,
OTHER
PUBLICATIONS
Irvine,
CA
S
(U
)
Widrow,
B.,
Glover,
J.,
McCool,
J.,
KaunitZ,
J.,
Williams,
C.,
Hearn,
(73)
Assignee:
Western
Digital
Technologies,
Inc"
R.,
Zeidler,
1.,
Eugene
Dong,
J
.,
Goodlin,
R..
“Adaptive
noise
can
Irvine,
CA
(US)
celling:
Principles
and
applications,”
Proceedings
of
the
IEEE
63
(12),
1692-1716,
1975.
(
*
)
Notice:
Subject
to
any
disclaimer,
the
term
of
this
_
patent
is
extended
or adjusted
under
35
(commued)
U.S.C.
154(b)
by
130
days.
(21)
APPL
NO;
13/668,142
Primary
Examiner
*
Antony
M
Paul
(22)
F11ed:
Nov.
2,
2012
(57)
ABSTRACT
(51)
1/02
2006
01
A
disk
drive
is
disclosed
comprising
a
servo
control
system
(
'
)
operable
to
actuate
a
head
over
a
disk.
A
disturbance
signal
is
(52)
U‘s‘
Cl“
generated
in
response
to
a
vibration,
and
the
disturbance
USPC
.......
..
360/75;
360/9716; 360/9719;
700/29;
Signal
is
?ltered
With
a
?rst ?lter
comprising
a
frequency
_ _ _
700/44;
700/45
response
to
generate
a
?ltered
disturbance
signal.
The
?ltered
(58)
Fleld
0f
ClaSSI?catlon
seardl
disturbance
signal
is
?ltered
With
a
model
of
the
servo
control
CPC
-----------
--
GUB
5/
54;
G11B
5/56;
GOSB
17/02
system
to
generate
a
compensated
disturbance
signal.
An
USPC
~~~~~~~~~~
--
318/56822,
571, 592, 593, 632,
114,
error
signal
of
the
servo
control
system
is
?ltered
With
a
318/1
15,
139;
360/75,
97-19,
97~16;
second
?lter
comprising
the
frequency
response
to
generate
a
700/29,
44’ 45s
54s
64s
71,
173:
254:
?ltered
error
signa1.An
adaptation
control
signal
is
generated
_ _
790/280,
302
in
response
to
the
compensated
disturbance
signal
and
the
see
apphcanon
?le
for
complete
searCh
hlstOI'Y-
?ltered
error
signal,
and
an
adaptive
?lter
is
adapted
in
_
response
to
the
adaptation
control
signal,
Wherein
the
adap
(56)
References
Clted
tive
?lter
?lters
the
disturbance
signal
to
generate
feed-for
U.S.
PATENT
DOCUMENTS
6,014,283
A
1/2000
Codilian
et
al.
6,052,076
A
4/2000
Patton,
III
et
al.
6,052,250
A
4/2000
Golowka
et
al.
VCM
CONTROL
20
3
626
CONTROL
Cl
RCU
ITRY
ward
compensation
values
applied
to
the
servo
control
system
to
compensate
for
the
vibration.
20
Claims,
3
Drawing
Sheets
US
8,922,938
B1
Page
2
(56)
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Wang
etal~
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7,679,854
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8,634,154
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1/2014
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7,688,534
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7,688,538
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8,643,976
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7,688,539
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7,697,233
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8,665,551
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3/2014
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6/2010
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8,670,206
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8,687,312
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7,746,594
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6131.
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4/2014
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7,777,982
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8/2010
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8,717,696
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6131.
8,717,699
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7,800,856
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5/2014
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a1.
7,852,588
B1
12/2010
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6/2014
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7,852,592
B1
12/2010
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8,743,503
B1
6/2014
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7,864,481
B1
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8,743,504
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7,864,482
B1
1/2011
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B1
1/2011
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8,760,796
B1
6/2014
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@1211.
7,876,522
B1
1/2011
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8,767,332
B1
7/2014
Chahwan
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7,876,523
B1
1/2011
Panyavoravaj
et
a1.
8,767,343
B1
7/2014
Helmick
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a1.
US
8,922,938
B1
Page
4
(56)
8,767,354
8,773,787
8,779,574
8,780,473
8,780,477
8,780,479
8,780,489
8,792,202
8,797,664
8,797,673
8,804,267
2002/0153451
2004/0213100
2010/0035085
2010/0284546
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