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Nonlinear least-squares optimisation of sensitivity function for disturbance attenuation on hard disk drives

Nonlinear least-squares optimisation of sensitivity function for disturbance attenuation on hard disk drives

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Published

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 frequencies. The micro-actuator is used as a secondary actuator to enhance the positioning accuracy of a servo track writer for hard disk drives. The disturbance attenuation capability of the designed control system is also evaluated for disturbances with varying frequencies. Simulation and experimental results show the effectiveness of this method in designing a controller so that specific conditions imposed on the sensitivity function are satisfied.

Inspec keywords: hard discs; disc drives; least squares approximations; closed loop systems; control system synthesis; optimisation

Other keywords: servo track writer; sensitivity function; disturbance attenuation; control system design; error rejection function; nonlinear least-squares optimisation; hard disk drives; closed-loop control system

Subjects: Storage on moving magnetic media; Optimisation techniques; Interpolation and function approximation (numerical analysis); Control system analysis and synthesis methods

References

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