DSP Implementation of a Direct Adaptive Feedforward Control Algorithm for Rejecting Repeatable Runout in Hard Disk Drives

2016 ◽  
Author(s):  
Jinwen Pan ◽  
Prateek Shah ◽  
Roberto Horowitz
Keyword(s):  
Digital Signal Processor ◽  
Control Method ◽  
Feedforward Control ◽  
Hard Disk Drives ◽  
Digital Signal ◽  
Hard Disk ◽  
Disk Drives ◽  
Bit Patterned Media ◽  
Dsp Implementation ◽  
Adaptive Feedforward

A direct adaptive feedforward control method for tracking repeatable runout (RRO) in bit patterned media recording (BPMR) hard disk drives (HDD) is proposed. The technique estimates the system parameters and the residual RRO simultaneously and constructs a feedforward signal based on a known regressor. An improved version of the proposed algorithm to avoid matrix inversion and reduce computation complexity is given. Results for both MATLAB simulation and digital signal processor (DSP) implementation are provided to verify the effectiveness of the proposed algorithm.

Acceleration feedforward control against rotational disturbance in hard disk drives

2001 ◽  
Vol 37 (2) ◽  
pp. 888-893 ◽  
Author(s):  
A. Jinzenji ◽  
T. Sasamoto ◽  
K. Aikawa ◽  
S. Yoshida ◽  
K. Aruga
Keyword(s):  
Feedforward Control ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives

Optimization of adaptive feedforward repeatable run-out cancellation for positioning control system of hard disk drives

2012 ◽  
Vol 18 (9-10) ◽  
pp. 1703-1709 ◽  
Author(s):  
Shota Yabui ◽  
Atushi Okuyama ◽  
Masahito Kobayashi ◽  
Takenori Atsumi
Keyword(s):  
Control System ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Positioning Control ◽  
Adaptive Feedforward

Feedforward control based on neural networks for disturbance rejection in hard disk drives

2009 ◽  
Vol 3 (4) ◽  
pp. 411-418 ◽  
Author(s):  
X. Ren ◽  
S.S. Ge ◽  
F.L. Lewis ◽  
T. Liew ◽  
V. Venkataramanan ◽  
...  
Keyword(s):  
Neural Networks ◽  
Disturbance Rejection ◽  
Feedforward Control ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives

Adaptive Control of Structural Acoustics using Intelligent Structures with Embedded Piezoelectric Patches

2003 ◽  
Vol 9 (11) ◽  
pp. 1285-1302
Author(s):  
Kougen Ma ◽  
J Melcher
Keyword(s):  
Adaptive Control ◽  
Digital Signal Processor ◽  
Feedforward Control ◽  
Low Cost ◽  
Digital Signal ◽  
Structural Acoustics ◽  
Intelligent Structures ◽  
Control Scheme ◽  
Hybrid Adaptive Control ◽  
Adaptive Feedforward

In this paper we focus on the adaptive control of structural acoustics using intelligent structures with embedded piezoelectric (PZT) patches and low cost digital signal processor systems. After a discussion on the adaptive feedforward control scheme, a hybrid adaptive control scheme is proposed, which takes advantage of both feedback control and adaptive feedforward control. The two schemes are realized on a low-cost, small volume, convenient and universal digital signal processing (DSP) board. A carbon fiber reinforced polymer plate with two embedded PZT patches is developed and used in two experiments. The first experiment is adaptive interior noise control using the intelligent plate, in which the adaptive feedforward control scheme is employed. Obvious noise reduction is obtained for constant frequency, swept frequency and varying amplitude harmonic disturbances. The second experiment is adaptive control of sound-induced vibration of the plate, where two embedded PZT patches are used as an actuator and a sensor, respectively, and the hybrid adaptive controller is applied. The full vibration reduction for various harmonic excitations is obtained, verifying the advantage of the hybrid adaptive control. It is demonstrated that active control of structural acoustics can be efficiently achieved by employing intelligent structures, advanced adaptive control schemes and the low-cost DSP board.

Flying Height Control for a 2-DOF Tripad Slider in Hard Disk Drives With Switched Regulator

2005 ◽  
Author(s):  
Zhizheng Wu ◽  
Foued Ben Amara
Keyword(s):  
Control Method ◽  
Hard Disk Drives ◽  
Surface Profile ◽  
Hard Disk ◽  
Disk Surface ◽  
Switched System ◽  
Flying Height ◽  
Disk Drives ◽  
The Stability ◽  
Adaptive Regulator

Maintaining a constant small flying height of the read/write head is an important target in the design of the ultra high storage density hard disk drives. One effective way to achieve this goal is to use a feedback regulator to suppress the flying height variations. For low flying heights, the read/write head enters into intermittent contact with the disk surface, which results in a switched system regulation problem. In this paper a new control method is proposed to maintain the flying height at its desired value based on the switched system models, despite the unknown microwaviness in the disk surface profile and the unpredictability in the switching times. First, a switched system model is constructed. Then, a Q parameterized set of switched regulators is constructed and the stability of the resulting switched closed loop system is analyzed. Online adaptive regulator tuning is then performed by adjusting the Q parameter in the controller to achieve regulation. Simulation results are presented to illustrate the effectiveness of the proposed method.

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