Xinghui Huang

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This paper proposes a vibration control scheme for an actuated slider dual-stage servo system. The control scheme consists of three components: a basic track-following servo control loop, a feedback vibration damping loop of the voice coil motor (VCM) assembly and a plug-in feedforward vibration compensation loop for the microactuator (MA). A strain sensor(More)
This paper presents the design and analysis of multirate robust track-following controllers for a dual-stage servo system with a MEMS microactuator (MA) and an instrumented suspension. Two major categories of controller design methodologies are considered. The first is based on sequential single-input single-output (SISO) design techniques, and includes the(More)
This paper discusses two mechatronic innovations in magnetic hard disk drive servo systems, which may have to be deployed in the near future, in order to sustain the continuing 60% annual increase in storage density of these devices. The first is the use of high bandwidth dual-stage actuator servo systems to improve the precision and track-following(More)
This paper presents a robust H2 synthesis technique for designing a track-following servo system for a hard disk drive (HDD) product line. The goal is to design a single robust controller that minimizes the worst case H2 performance of an entire disk drive product line, assuming that dynamic variations in the product line (i.e. variations from one unit to(More)
This paper proposes controller design methods, specially for track-following control of the magnetic read/write head in a hard disk drive (HDD). The servo system to be considered is a general dual-stage multisensing system, which encompasses most of the track-following configurations encountered in the HDD industry, including the traditional single-stage(More)
This paper proposes a robust track-following controller design method for a dual-stage servo system in magnetic hard disk drives (HDDs). The method formulates the problem of minimizing track misregistration (TMR) in the presence of plant uncertainty and variation as a multiobjective optimization problem. Tracking error minimization is naturally formulated(More)
This paper proposes a multi-rate design method for robust track-following controllers in hard disk drives (HDDs). The HDDs to be considered are dualstage multi-sensing systems. A track-following problem, which takes into account robust stability, is formulated as a periodically time-varying version of the standard mixed H2/H∞ control problem. This problem(More)
Positioning the read-write head in a hard disk drive over data bits at densities now approaching 1 terabit per square inch will novel servo configurations and controllers. This paper presents a MEMS microactuator for installation in a dual-stage servo system for a hard disk drive and controller designs that utilize the microactuator to suppress vibration of(More)
This paper presents the design and analysis of a track-following controller using a mixed-objective optimization technique for dual-stage servo systems in hard disk drives (HDD). The objective of minimizing tracking error in the presence of plant uncertainties and operational variations is formulated into a framework of multi-objective minimization. The(More)
This paper proposes controller design methods, specially for track-following control of the magnetic read/write head in a hard disk drive (HDD). The servo system to be considered is a general dual-stage multi-sensing system, which encompasses most of the track-following configurations encountered in the HDD industry, including the traditional single-stage(More)