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Sensitivity function or error rejection function is crucial to determine the disturbance attenuation capability of a closed-loop control system. A nonlinear least-squares optimisation method is applied in sensitivity function shaping to design a feedback controller for a micro-actuator such that its sensitivity function fulfills desired specifications in order to attenuate disturbances at specific frequencies. The micro-actuator is used as a secondary actuator to enhance the positioning accuracy of a servo track writer for hard disk drives. The disturbance attenuation capability of the designed control system is also evaluated for disturbances with varying frequencies. Simulation and experimental results show the effectiveness of this method in designing a controller so that specific conditions imposed on the sensitivity function are satisfied.
References
-
-
1)
-
J. Zheng ,
G. Guo ,
Y. Wang
.
Identification and decentralized control of a dual-actuator hard disk drive system.
IEEE Trans. Magn.
,
2515 -
2521
-
2)
-
Kim, Y.H., Kang, C.I., Tomizuka, M.: `Adaptive and optimal rejection of non-repeatable disturbance in hard disk drives', IEEE/ASME Conf. on Advanced Intelligent Mechatronics Proc., July 2005, Monterey, CA, USA, p. 1–6.
-
3)
-
K. Takaishi ,
Y. Uematsu ,
T. Yamada ,
M. Kamimura ,
M. Fukushi ,
Y. Kuroba
.
Hard disk drive servo technology for media-level servo track writing.
IEEE Trans. Magn.
,
2 ,
851 -
856
-
4)
-
H. Yada ,
H. Ishioka ,
T. Yamakoshi ,
Y. Onuki ,
Y. Shimano ,
M. Uchida ,
H. Kanno ,
N. Hayashi
.
Head positioning servo and data channel for HDDs with multiple spindle speeds.
IEEE Trans. Magn.
,
5 ,
2213 -
2215
-
5)
-
Beghi, A., Oboe, R., Capretta, P., Soldavini, F.C.: `Loop shaping issues in hard disk drive servo system design', IEEE/ASME Conf. on Advanced Intelligent Mechatronics Proc., July 2001, Como, Italy, p. 828–832.
-
6)
-
Fujimoto, H., Kawakami, F., Kondo, S.: `Multirate repetitive control and applications', Proc. American Control, June 2003, Denver, Colorado, USA, p. 2875–2880.
-
7)
-
Kawafuku, M., Iwasaki, M., Hirai, H., Kobayashi, M., Okuyama, A.: `Rejection of repeatable runout for HDDs using adaptive filter', The 8th IEEE Intl. Workshop on Advanced Motion Control, March 2004, Kawasaki, Japan, p. 305–310.
-
8)
-
MicroE PA100 Positioner-Installation Guide and User's Manual, MicroEColorado.
-
9)
-
R. Nagamune ,
A. Blomqvist
.
Sensitivity shaping with degree constraint by nonlinear least-squares optimization.
Automatica
,
1219 -
1227
-
10)
-
Du, C., Xie, L., Guo, G.: `A generalized KYP lemma based control design and application for 425 kTPI servo track writing', Proc. American Control Conf., June 2006, Minneapolis, Minnesota, USA, p. 1303–1308.
-
11)
-
Nagamune, R., Blomqvist, A.: `Sensitivity shaping with degree constraint by nonlinear least-squares optimization', Technical Report, Optimization and Systems Theory, , Royal Institute of Technology. Available at http://www.math.kth.se/~andersb/research/NBTechReport2.pdf.
-
12)
-
A.H. Sacks ,
M. Bodson ,
W. Messner
.
Advanced methods for repeatable runout compensation.
IEEE Trans. Magn.
,
1031 -
1036
-
13)
-
A. Blomqvist ,
R. Nagamune
.
Matlab interface ‘Sshaper’.
-
14)
-
R. Ehrlich ,
D. Curran
.
Major HDD TMR sources and projected scaling with TPI.
IEEE Trans. Magn.
,
885 -
891
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cta_20060359
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