A method and an apparatus detect and compensate for a mechanical resonance frequency occurring in a system. The apparatus includes an excitation unit that increases a gain of a predetermined frequency band of a driving signal, a resonance frequency detector frequency-transforming a response signal, and detecting the resonance frequency in a frequency domain, an excitation signal generator separately generating a first excitation signal and a second excitation signal, a mixer mixing one of the first excitation signal or the second excitation signal with a driving signal that does not pass through the excitation unit, and inputting a result of the combination to the system, a resonance determination unit determining whether resonance occurs in the system, and a system controller determining a frequency of one of the first excitation signal or the second excitation signal input when resonance occurs in the system, as the resonance frequency.

Apparatus and method for detecting and compensating for resonance frequency in data storage system

An apparatus and method for removing mechanical resonance in a disc drive using an adaptive notch filter. Mechanical resonance harmful to a system is removed by a notch filter that adaptively varies the frequency characteristics of the filter with respect to the mechanical resonance frequency existing in the system. The mechanical resonance removing apparatus using an adaptive notch filter comprises an excitation signal generator, which in a predetermined notch filter adjusting mode generates an excitation signal exciting the system and provides the signal to the system, a resonance frequency estimator detecting a resonance frequency component from a responding signal from the system corresponding to the excitation signal, a notch filter coefficient generator determining coefficients of a notch filter corresponding to the resonance frequency component detected by the resonance detection unit and the notch filter applying the coefficients determined by the notch filter coefficient generator, to remove the resonance frequency of the system.

Apparatus and method for removing mechanical resonance using adaptive notch filter

A job management apparatus includes a detection section that detects the number of unused licenses, a determination section that determines whether or not the number of unused licenses is sufficient to cover the number of licenses necessary for execution of a first job to be executed, and a job control section that sets a used license that is used by a second job into an unused state, in which a priority rank assigned to the second job is lower than a priority rank assigned to the first job, when the determination section determines that the number of unused licenses is not sufficient to cover the number of licenses necessary for execution of the first job, and allocates the used license set into the unused state to the first job.

Apparatus for setting used license of executing job into unused license state and allocating the set unused license to a to be executed job based on priority

The resonance of a hard disk drive using a notch filter is suppressed by detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is disabled, and storing the detected resonance frequency as a start frequency, determining a coefficient of the notch filter to correspond to the start frequency and enabling the notch filter, detecting a resonance frequency after a far distance search is conducted, in a state in which the notch filter is enabled, and storing the detected resonance frequency as a target frequency, and changing the coefficient of the notch filter to correspond to the target frequency.

Method and apparatus for suppressing resonance of hard disk drive using notch filter

A system and method of implementing servomechanism control without rate feedback is provided. A position feedback signal is filtered using a non-linear lead-lag filter that has a variable frequency response to thereby generate a compensated position feedback signal. A position error signal is generated from a position command signal and a sensed position signal, and the frequency response of the non-linear lead-lag filter is varied in response to the position error signal. A compensated position error signal is generated from the commanded position signal and the compensated position feedback signal. The compensated position error signal is at least selectively filtered using a non-linear integral filter that has a variable gain to thereby at least selectively supply a filtered position error signal. The gain of the non-linear integral filter is varied in response to the compensated position error signal.

Adaptive servo control system and method

A disc drive includes a base and a disc rotatably attached to the base. The disc drive also includes an actuator assembly rotatably attached to said base and a device for moving the actuator assembly. The actuator assembly includes an actuator arm and a transducer head in a transducing relationship with respect to the disc. The transducer is attached to the actuator arm. A method for screening disc drives for resonant frequencies associated with the actuator arm includes the steps of following a track within the disc drive, and selectively boosting the servo control signal. The method further includes a step of monitoring a position error signal from a transducer attached to an actuator arm of a disc drive. The position error signal is monitored by filtering the position error signal using a bandpass filter. Boosting the servo control loop includes tuning the magnitude of the booster signal gain.

Resonance screen with varying frequency and controllable gain booster

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Resonance screen with varying frequency and controllable gain booster