A disturbance observer approach to detecting and rejecting narrow-band disturbances in hard disk drives

2008 ◽  
Author(s):  
Qixing Zheng ◽  
Masayoshi Tomizuka
Keyword(s):  
Disturbance Observer ◽  
Narrow Band ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives

Direct Adaptive Disturbance Observer Design for Rejecting the Narrow-Band Disturbance With Unknown Frequency in Hard Disk Drives

2009 ◽  
Author(s):  
Qixing Zheng ◽  
Masayoshi Tomizuka
Keyword(s):  
Disturbance Observer ◽  
Narrow Band ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Observer Design ◽  
Disk Drives ◽  
Optimal Value ◽  
Band Pass ◽  
Servo Controller

This paper presents an adaptive add-on compensator to handle a single narrow-band disturbance with unknown frequency in hard disk drives (HDDs). A disturbance observer (DOB) loop with a narrow band pass Q filter is built around the baseline servo controller to reject the narrow-band disturbance. The frequency parameter of the Q filter is directly adapted to the optimal value in the sense of minimizing the track following track mis-registration (TMR). The performance of the proposed compensator is demonstrated by simulation on an open-source realistic hard disk drive system.

A Peak Filtering Method with Improved Transient Response for Narrow-Band Disturbance Rejection in Hard Disk Drives

2010 ◽  
Vol 43 (18) ◽  
pp. 71-75 ◽  
Author(s):  
Fan Hong ◽  
Chee Khiang Pang ◽  
Wai Ee Wong ◽  
Tong Heng Lee
Keyword(s):  
Transient Response ◽  
Disturbance Rejection ◽  
Narrow Band ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Filtering Method

Unknown Multiple Narrow-Band Disturbance Rejection in Hard Disk Drives: An Adaptive Notch Filter and Perfect Disturbance Observer Approach

2010 ◽  
Author(s):  
Xu Chen ◽  
Masayoshi Tomizuka
Keyword(s):  
Disturbance Observer ◽  
Narrow Band ◽  
Hard Disk Drives ◽  
Notch Filter ◽  
Hard Disk ◽  
Disk Drive ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Adaptive Notch Filter ◽  
Control Scheme

In this paper, an adaptive control scheme is developed to reject unknown multiple narrow-band disturbances in a hard disk drive. An adaptive notch filter is developed to efficiently estimate the frequencies of the disturbance. Based on the correctly estimated parameters, a disturbance observer with a newly designed multiple band-pass filter is constructed to achieve asymptotic perfect rejection of the disturbance. Evaluation of the control scheme is performed on a benchmark problem for HDD track following.

Pivot friction compensation using an accelerometer and a disturbance observer for hard disk drives

1998 ◽  
Vol 3 (3) ◽  
pp. 194-201 ◽  
Author(s):  
J. Ishikawa ◽  
M. Tomizuka
Keyword(s):  
Disturbance Observer ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Friction Compensation ◽  
Disk Drives

scholarly journals An Indirect Adaptive Approach to Reject Multiple Narrow-Band Disturbances in Hard Disk Drives

2010 ◽  
Vol 43 (18) ◽  
pp. 44-49 ◽  
Author(s):  
Xu Chen ◽  
Masayoshi Tomizuka
Keyword(s):  
Narrow Band ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Adaptive Approach

H∞ disturbance observer design for high precision track following in hard disk drives

2009 ◽  
Vol 3 (12) ◽  
pp. 1591-1598 ◽  
Author(s):  
C.K. Thum ◽  
C. Du ◽  
E.H. Ong ◽  
B.M. Chen ◽  
F.L. Lewis
Keyword(s):  
High Precision ◽  
Disturbance Observer ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Observer Design ◽  
Disk Drives
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