Shock-Response-Spectrum Analysis for Acoustic Noise of a Seeking Control System in a Hard Disk Drive

Okuyama, Atsushi; Hamaguchi, Tetsuya; Watanabe, Keiko; Horiguchi, Takao; Shishida, K.; Nishimura, Yuji

doi:10.1299/jsmeintmovic.6.1.320

Cited by 2 publications

(3 citation statements)

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“…4 ('o's indicate the results obtained by using the real-time calculation, and 'x's indicate the results by using look-up tables). In this case, the seek times using look-up tables are set as faster than those using real-time (1,2,4,8,15,30,60). When the target seek span is in between these seek spans, the feedforward control inputs use the longer side table.…”

Section: Short-span Seek Controlmentioning

confidence: 99%

“…SHOCK-RESPONSE-SPECTRUM ANALYSIS To analyze the settling vibration caused by the acceleration feedforward input, SRS analysis was used in this study. The SRS analysis is suitable for evaluating acoustic noise and settling vibrations in the track-seeking control of hard disk drives [15]. A schematic diagram of SRS analysis is in Fig.…”

Section: Short-span Seek Controlmentioning

confidence: 99%

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Shock-response-spectrum analysis of sampled-data polynomial for track-seeking control in hard disk drives

Atsumi

2008

2008 10th IEEE International Workshop on Advanced Motion Control

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To decrease the seek time of hard disk drives, a feedforward control method was developed by using a sampled-data polynomial to compensate for discretization errors of the zeroorder hold. The sampled-data polynomial satisfies the boundary conditions that include the characteristics of the zero-order hold, and compensates for the discretization error caused by the zero-order hold without the need for complicated calculations. The feedforward control with a polynomial enables real-time calculation without the need for look-up tables, which require a large amount of memory. Moreover, the waveform of the feedforward control input generated by using the polynomial is smooth and decreases the magnitude of the mechanical vibrations by using shock-response-spectrum (SRS) analysis. When the proposed method was applied on a hard disk drive it significantly reduced the amount of tracking error in the seek control and also reduced the seek time.

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Section: Short-span Seek Controlmentioning

confidence: 99%

Section: Short-span Seek Controlmentioning

confidence: 99%

Shock-response-spectrum analysis of sampled-data polynomial for track-seeking control in hard disk drives

Atsumi

2008

2008 10th IEEE International Workshop on Advanced Motion Control

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“…Gain of the spectrum in the area are certainly smaller than before, and moreover its seek time is the same. The SRS (shock response spectrum) analysis based design is defined to search an optimal set of parameters of a given seek trajectory to minimize gain of specified frequency in time response [9]. Figure 9 shows an example of reference trajectory and its six parameters to be optimized.…”

Section: Reference Trajectory Designmentioning

confidence: 99%

A Design Method of a Full Closed Loop Sampled Servo Control for Hard Disk Drive

Yamaguchi

Atsumi

2008

SICE Journal of Control, Measurement, and System Integration

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This paper presents a design methodology for fast and precise positioning using a full closed loop sampled servo control system. A servo control of hard disk drive (HDD) achieves 3-4 ms fast access and nanoscale positioning accuracy. To achieve the nanoscale precise positioning, a full closed loop feedback control is a key structure. From control theory viewpoint, the full closed loop is an ideal method, but it is difficult to take this method in industries due to sensor allocation. In HDD, this full closed loop feedback control has been applied for last 20 years. The full closed loop sometimes brings drawbacks to the servo control design. In HDD case, that is a limited sampling rate selection. In this paper, based on these two features which are the full closed loop and a sampled servo, uniquely developed servo design methods for HDD are presented, which include two-degrees-of-freedom (TDOF) controller with multi-rate sampling, reference trajectory design not to excite higher order mechanical resonances, settling servo to compensate for tracking error near the target, phase stabilized design of feedback control to have better sensitivity, and multi-rate filter design to suppress disturbances above the Nyquist frequency.

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Shock-Response-Spectrum Analysis for Acoustic Noise of a Seeking Control System in a Hard Disk Drive

Cited by 2 publications

References 0 publications

Shock-response-spectrum analysis of sampled-data polynomial for track-seeking control in hard disk drives

Shock-response-spectrum analysis of sampled-data polynomial for track-seeking control in hard disk drives

A Design Method of a Full Closed Loop Sampled Servo Control for Hard Disk Drive

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