Increased disturbance rejection in magnetic disk drives by acceleration feedforward control and parameter adaptation

White, Matthew; Tomizuka, M.

doi:10.1016/s0967-0661(97)00058-0

Cited by 53 publications

(15 citation statements)

References 4 publications

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“…The order of the FIR filter is 35, and its coefficients are adapted at each sample, using the following equation [29]: (4) where and are the position error signal and the measured acceleration at the th sample, respectively. The compensation signal is (5) With this simple compensation scheme, the rejection to vibrational disturbances is highly increased, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

et al. 2003

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A 2.5-rad/s 2 resolution micro-electro-mechanical system-based rotational accelerometer targeted for hard disk drive (HDD) application is presented. The device is composed by a 0.6m BICMOS electronic interface that implements together with the MEMS sensor one single bit electromechanical 61 conversion loop able to detect capacitive unbalancing as low as 50 aF (50 10 18 F). The produced bitstream is then processed by a digital chain and made available through a standard three-wire digital interface. The device is intended for feedforward compensation of external disturbances acting on computer HDDs to steadily keep the read-write heads on track and to allow greater track densities.

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Section: Resultsmentioning

confidence: 99%

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

et al. 2003

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“…As suggested by many authors [11,12], accelerometers are used to detect acceleration signal for external vibration rejection. Feedforward control schemes are then proposed with the acceleration signal injected as an input, in order to reduce bad influence of external vibrations on positioning accuracy of R/W head.…”

Section: Introductionmentioning

confidence: 99%

H_∞ compensation of external vibration impact on servo performance of hard disk drives in mobile applications

Lewis

2007

Adaptive Control & Signal

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SUMMARYH ∞ compensation for external vibration impact on the positioning accuracy of hard disk drives is considered in this paper. A feedforward controller is designed to attenuate the impact with the aid of a sensor to detect external vibrations. Loop shaping in frequency domain and H ∞ method in state space are used to design the feedforward controller. The linear matrix inequality approach is adopted for solving the H ∞ feedforward control design problem. The application results in a 1.8-in disk drive with an accelerometer to measure acceleration signal show that 97% reduction of the position error signal is achieved with the feedforward control designed by the H ∞ method. The effectiveness of the two methods is also evaluated and compared when external vibration model is subjected to gain variations.

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“…The FXLMS algorithm is widely used for adaptive disturbance rejection because of its simplicity in realization. Particularly in the field of active noise control, the FXLMS algorithm has been extensively applied to cancel unwanted noise at a specified location [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Acceleration feedforward control in active magnetic bearing system subject to base motion by filtered-X LMS algorithm

Kang¹,

Yoon

2006

IEEE Trans. Contr. Syst. Technol.

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This brief addresses the application of an active magnetic bearing (AMB) system to levitate the elevation axis of an electro-optical sight mounted on a moving vehicle. In this type of system, it is desirable to retain the elevation axis in an air-gap between magnetic bearing stators while the vehicle is moving. An optimal acceleration feedforward compensator design technique is proposed to attenuate disturbance responses in an AMB system that is subject to base motion. In consideration of the sensitivity of the disturbance compensation performance to the model accuracy, an experimental feedforward compensator is developed from an adaptive estimation by means of the filtered-least mean square (FXLMS) algorithm. The compensation control is applied to a single degree of freddom (DOF) AMB system subject to base motion. The feasibility of the proposed technique is illustrated, and the results of an experimental demonstration are shown.Index Terms-Acceleration feedforward compensator, active magnetic bearing (AMB), adaptive estimation, base motion, disturbance, electromagnetic forces, feedforward compensation, filteredleast mean square (FXLMS) algorithm, least mean square method.

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Increased disturbance rejection in magnetic disk drives by acceleration feedforward control and parameter adaptation

Cited by 53 publications

References 4 publications

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

H_∞ compensation of external vibration impact on servo performance of hard disk drives in mobile applications

Acceleration feedforward control in active magnetic bearing system subject to base motion by filtered-X LMS algorithm

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Increased disturbance rejection in magnetic disk drives by acceleration feedforward control and parameter adaptation

Cited by 53 publications

References 4 publications

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

A 2.5-rad/s/sup 2/ resolution digital output MEMS-based rotational accelerometer for HDD applications

H∞ compensation of external vibration impact on servo performance of hard disk drives in mobile applications

Acceleration feedforward control in active magnetic bearing system subject to base motion by filtered-X LMS algorithm

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H_∞ compensation of external vibration impact on servo performance of hard disk drives in mobile applications