Stability analysis of a disk-spindle supported by a plain journal bearing and pivot bearing

Ono, Kyosuke; Murashita, Seiji; Yamaura, Hiroshi

doi:10.1007/s00542-005-0574-9

Cited by 9 publications

(3 citation statements)

References 6 publications

(6 reference statements)

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“…As for stability characteristics, whirl instability does not occur for the designed bearings over all eccentricity ratios. Ono et al [2] analyzed the stability of a disk-spindle supported by a plain journal bearing, and pivot bearing increases quadratically as rotational speed increases. Zhou et al [3] studied the oil-film dynamic coefficients of a journal bearing using an experimental method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Stability Study on Herringbone-Microgrooved Journal Bearing in an Impeller-Spindle

2012

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The reliability of the impeller-spindle with respect to the effects of abnormal vibrations and noises is relative to the whirl rotation in notebook (NB) computers, all-in-one (AIO) desktop systems, and tablet PCs. This study experimentally investigates the stability of a herringbone-microgrooved journal bearing in an impeller-spindle under static radial forces. The experimental device operated at 2700, 3600, 4200, and 4900rpm, with a static load ranging from 0.4, 0.8, and 1.6N. The experiment obtained the stiffness and damping coefficients, and the study involved analyzing the stability. Results show that the dimensionless threshold speed of rotation decreased as the Sommerfeld number increased. The proposed impeller-spindle is stable when the Sommerfeld number is less than 59, indicating that the impeller-spindle should not operate at an eccentricity ratio below 0.18.

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Section: Introductionmentioning

confidence: 99%

Experimental Stability Study on Herringbone-Microgrooved Journal Bearing in an Impeller-Spindle

2012

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“…Yoon and Shen (2005) presented a numerical model predicting the shock response of rotating-shaft spindle motor with nonlinear FDBs. Ono et al (2005) have studied the stability of journal bearings only corresponding to translation motion. They analyzed the stability of a disk-spindle assembly supported by hydrodynamic plain journal bearings and a pivot bearing at the bottom of the flexible shaft.…”

Section: Introductionmentioning

confidence: 99%

Robust optimal design of the FDBs in a HDD to reduce NRRO and RRO

Lee

Jang

2012

Microsyst Technol

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This research proposes a robust optimal design methodology of the FDBs in a HDD to reduce RRO and NRRO. The critical mass, which determines the dynamic behavior of rotor-bearing system, was selected as an objective function, and the constraint equations were the friction torque of the FDBs, and the stiffness and damping coefficients related with under-damped vibration modes. Ten major design variables of the FDBs were chosen in this optimization problem. The steady-state whirl radius and the shock response at half-speed whirl of the rotating rigid spindle-bearing system were evaluated as RRO and NRRO, respectively. RRO and NRRO of the optimal design were compared with those of conventional one, and it showed that the proposed method could effectively reduce RRO and NRRO.

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“…However, previous research has been restricted to the stability of journal bearings only for the translation motion. Ono et al (2005) analyzed the stability of a disk-spindle assembly supported by hydrodynamic plain journal bearings and a pivot bearing at the bottom of the shaft, and they showed that the gyro effect could stabilize the half-frequency whirl of the disk-spindle assembly. However, their study was restricted to the translation and tilting motion of the rotor with the journal bearings in four degrees of freedom, i.e., x, y, h x and h y .…”

Section: Introductionmentioning

confidence: 99%

Robust design of a HDD spindle system supported by fluid dynamic bearings utilizing the stability analysis of five degrees of freedom of a general rotor-bearing system

2010

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This paper proposes a method to improve the robustness of a hard disk drive (HDD) spindle supported by fluid dynamic bearings (FDBs) by utilizing the stability analysis of the five degrees of freedom of a general rotorbearing system. The Reynolds equations and the perturbed equations of the coupled journal and thrust bearings were solved by FEM to calculate the dynamic coefficients. The paper introduces the radius of gyration to the equations of motion in order to consistently define the stability problem with respect to a single variable, i.e., the mass. The critical mass, which is the threshold between the stability and instability of the HDD spindle, is determined by solving the linear equations of motion. The proposed method was applied to improve the robustness of a HDD spindle supported by FDBs by varying the groove parameters. It shows that the optimized groove design obtained using the proposed method increases both the stability and the modal damping ratio of the half-speed whirl mode. This research also determines the motions of the rotating disk-spindle system by solving its nonlinear equations of motion with the Runge-Kutta method. It shows that the groove design optimized using the proposed method has a small whirl radius in the steady state. It also shows that it has very little displacement due to the shock excitation, and that it quickly recovers to the equilibrium state.

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Stability analysis of a disk-spindle supported by a plain journal bearing and pivot bearing

Cited by 9 publications

References 6 publications

Experimental Stability Study on Herringbone-Microgrooved Journal Bearing in an Impeller-Spindle

Experimental Stability Study on Herringbone-Microgrooved Journal Bearing in an Impeller-Spindle

Robust optimal design of the FDBs in a HDD to reduce NRRO and RRO

Robust design of a HDD spindle system supported by fluid dynamic bearings utilizing the stability analysis of five degrees of freedom of a general rotor-bearing system

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