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Most servo control algorithm implementations have been realized using digital signal processors (DSPs) due to large amount of digital signal processing. Nowadays, parallel programmable logic devices, such as the field programmable gate array (FPGA), have become powerful hardware options, offering low cost, high execution speed, reconfigurability and parallelism. This work intends to exploit the current...
An integrative servo analysis platform is used to carry out simulations for a commercial drive using patterned media technology. Servo performance is compared between the conventional linear control and some advanced servo control algorithms. In addition, the effects on the PES quality due to the timing jitter on the sampling time, quantization of PES signal, and quantization of control signal are...
This paper takes into consideration the rejection of narrow-band disturbances at two frequencies higher than servo bandwidth in order to obtain good positioning accuracy for a micro-actuator. A phase stabilized feedback controller combined with a disturbance observer structure is applied to achieve the rejection of the two disturbances. A high frequency bandpass filter is adopted in the disturbance...
Sensitivity function or error rejection function is crucial to determine the disturbance attenuation capability of a closed-loop control system. A nonlinear least-squares optimisation method is applied in sensitivity function shaping to design a feedback controller for a micro-actuator such that its sensitivity function fulfills desired specifications in order to attenuate disturbances at specific...
This paper deals with the read/write (R/W) gap delay measurement and estimation problem in self-servo track writing. Kalman filtering approach is applied in the estimation of the RAV gap delay. The technique presented in this paper is expected to save the process time for capturing the R/W gap delay during self-servo track writing. The simulation result demonstrates the effectiveness of the presented...
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