Jianbin Nie

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This paper discusses the design and implementation of two track-following controllers for dual-stage hard disk drive servo systems. The first controller is designed by combining an outer loop sensitivity-decoupling (SD) controller with an inner loop disturbance observer (DOB). The second is designed by combining mixed H2/H∞ synthesis techniques with an(More)
This paper discusses optimal H∞ control synthesis via discrete Riccati equations for discrete linear periodically timevarying (LPTV) systems. Based on the results presented in [1], an explicit minimum entropy H∞ controller for general time-varying systems is obtained. The control synthesis technique is subsequently applied to LPTV systems and it is shown(More)
This paper summarizes work that has been completed to evaluate the use of high-resolution thin-film strain sensors for vibration suppression in hard disk drives (HDDs). In particular, we demonstrate the viability and necessity of symmetrical sensors for cancellation of common non-off-track modes in the measurement. Thin-film ZnO strain sensors have been(More)
This paper discusses the optimal H∞ control synthesis via discrete Riccati equations for hard disk drives (HDDs) with an irregular sampling rate. A HDD servo system with an irregular sampling rate, caused by missing position error signal sampling data, is modeled as a linear periodically timevarying (LPTV) system. An optimal H∞ track-following control(More)
Missing position error signal sampling data in hard disk drives (HDDs) results in their servo systems having irregular sampling rates (ISRs).With the natural periodicity ofHDDs, which is related to the disk rotation, HDD servo systems with ISRs can be modeled as linear periodically time-varying systems. Based on our previous results, an explicit minimum(More)
This paper describes the integration of thin film ZnO strain sensors onto hard disk drive suspensions for improved vibration suppression for tracking control. Sensor location was designed using an efficient optimization methodology based on linear quadratic gaussian (LQG) control. Sensors were fabricated directly onto steel wafers that were subsequently(More)
This chapter presents two new control synthesis approaches for dual-stage track-following servo systems. Both approaches are based on H2 guaranteed cost analysis, in which an upper bound on the worst-case H2 performance of a discretetime system with gain-bounded unstructured causal LTI uncertainty is determined by solving either a semi-definite program(More)
This paper discusses the design and implementation of H2 guaranteed cost control for dual-stage hard disk drive trackfollowing servo systems. The proposed approach is based on H2 guaranteed cost analysis, in which an upper bound on the worst-case H2 performance of a discrete-time system with gainbounded unstructured uncertainty is determined via several(More)
PID control is widely used in air conditioning system. The algorithm is simple but has a long response time, and the adjustment is not flexible. In this paper, we propose a method of optimizing PID controller parameters based on adaptive genetic algorithm. Specifically, the fitness function with penalty terms is added to the classical genetic algorithm and(More)