Dynamic Head-Disk Interface Modeling and Adaptive Control of a Hybrid Actuator for Optical Data Storage Systems

Abstract

In the near-field recording (NFR) system, the gap between the lens and disk will drop down to 100 nm. However, the disk vibration and force disturbance make it difficult to maintain the desired flying height during disk operation, and the lens-disk collision can easily occur. It is proposed in this article to design a hybrid actuator system which combines both advantages of the flying slider used in hard disk drives and the voice coil actuator used in optical disk drives. The dynamic head-disk interface model of the hybrid actuator is first developed, then an adaptive regulation approach is proposed to control the flying height at its desired value despite the unknown disturbances. Simulation and experimental results are presented to illustrate the effectiveness of the proposed flying height control approach.

Robust H-Inf Phase Control for Flexible System With Weak Damping

“…W ITH the constant seeking of precision and efficiency, a large number of flexible systems have been put into industrial production, ranging from the read/write heads of computer hard disks to all kinds of spacecraft, such as Space telescopes with Solar array or high-gain antennas [1], [2], [3], [4], large truss structure satellites [5], etc. The uncertainties of flexible systems include structural uncertainties and nonstructural uncertainties.…”

Micromirror-based real image laser automotive head-up display

“…The HUD technology currently dominating the market is based on LCD's virtual image type, which has not been widely used in general cars due to its high cost ($1000-1500) and bulky size (4 L). Microsystem technology and MEMS (microelectromechanical systems) micromirrors have been intensively developed in the past 2 decades and have found various applications due to its high integration, small size, and suitability for low-cost batch production [6][7][8][9][10][11][12] . Micromirror-based laser vector scanning automotive HUDs were previously developed [13][14][15][16] with the core component to be an electrostatic repulsiveforce-driven micromirror [17][18][19][20][21][22] .…”