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Title: Robust H∞ compensation for external vibration on hard disk drives in mobile applications
Authors: Du, C.
Ge, S.S. 
Hong, F.
Zhang, J.
Lewis, F.L.
Issue Date: 2008
Citation: Du, C.,Ge, S.S.,Hong, F.,Zhang, J.,Lewis, F.L. (2008). Robust H∞ compensation for external vibration on hard disk drives in mobile applications. International Workshop on Advanced Motion Control, AMC 1 : 260-265. ScholarBank@NUS Repository.
Abstract: Compensation for external vibration impact on the positioning accuracy of hard disk drives is considered with the presence of actuator uncertainty in this paper. The low-frequency mode change due to actuator pivot nonlinearity of the voice-coil-motor (VCM) actuator is described as frequency and damping uncertainty. A robust feedforward controller is then designed in continuous time domain by using H∞ method to attenuate the impact with the aid of a sensor to detect external vibrations. The linear matrix inequality (LMI) approach is adopted to solve the robust H∞ feedforward control design problem. The application results in a 1.8-inch disk drive with an accelerometer to measure acceleration signal show that 27% to 91% reduction of the position error signal is achieved with the robust feedforward controller when the frequency changes in 70±50 Hz and damping in 0.4±0.3. The effectiveness of the robust feedforward control is also demonstrated to be better than nominal feedforward control. © 2008 IEEE.
Source Title: International Workshop on Advanced Motion Control, AMC
ISBN: 9781424417032
DOI: 10.1109/AMC.2008.4516076
Appears in Collections:Staff Publications

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