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Proceedings Papers

Evaluation of Mechanical Reliability of Micro Bump in Semiconductors Through a Shear Test

Y. J. Cho, M. B. Han, J. S. Bae, I. J. Choi, D. S. Choi, H. G. Noh, S. J. Yoo, G. H. Jang

Proc. ASME. ISPS2021, ASME 2021 30th Conference on Information Storage and Processing Systems, V001T01A002, June 2–3, 2021

Paper No: ISPS2021-65058

DOI: https://doi.org/10.1115/ISPS2021-65058

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Topics: Finite element analysis, Reliability, Semiconductors (Materials), Shear (Mechanics)

Proceedings Papers

Prediction and Experimental Verification of the Heights of Air-Oil Interfaces in the FDBs in a Tied Shaft of HDDs During Non-Operating Conditions

M. H. Lee, J. H. Lee, K. B. Kim, G. H. Jang

Proc. ASME. ISPS2017, ASME 2017 Conference on Information Storage and Processing Systems, V001T05A003, August 29–30, 2017

Paper No: ISPS2017-5427

DOI: https://doi.org/10.1115/ISPS2017-5427

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Topics: Atmospheric pressure, Bearings, Clearances (Engineering), Disks, Fluids, Hydrostatic pressure, Pressure

Proceedings Papers

Effects of the Friction Coefficient of a Barrel on Grinding Performances in Planetary Ball Mill

B. C. Kim, G. H. Jang

Proc. ASME. ISPS2017, ASME 2017 Conference on Information Storage and Processing Systems, V001T01A016, August 29–30, 2017

Paper No: ISPS2017-5470

DOI: https://doi.org/10.1115/ISPS2017-5470

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Topics: Ball mills, Friction, Grinding, Shear (Mechanics), Discrete element methods

Proceedings Papers

Sensitivity Analysis on Solder Joint Fatigue Life of Solid State Drives by Finite Element Method and Monte Carlo Simulation

Y. J. Cho, J. W. Jang, G. H. Jang

Proc. ASME. ISPS2017, ASME 2017 Conference on Information Storage and Processing Systems, V001T11A001, August 29–30, 2017

Paper No: ISPS2017-5453

DOI: https://doi.org/10.1115/ISPS2017-5453

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Topics: Fatigue life, Finite element methods, Sensitivity analysis, Simulation, Solder joints, Solders, Excitation, Corners (Structural elements), Design, Fatigue

Proceedings Papers

Effect of Additional Harmonics of Driving Current on Torque Ripple and Unbalanced Magnetic Force of the BLDC Motors With Stator and Rotor Eccentricities

S. J. Sung, G. H. Jang, K. J. Kang, J. Y. Song

Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T05A002, June 23–24, 2014

Paper No: ISPS2014-6913

DOI: https://doi.org/10.1115/ISPS2014-6913

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Topics: Magnetic fields, Motors, Rotors, Stators, Torque, Poles (Building), Winding (process)

Proceedings Papers

Stability Analysis of a Whirling Rigid Rotor Supported by FDBs Considering Five Degrees of Freedom of a General Rotor-Bearing System

M. H. Lee, J. H. Lee, G. H. Jang

Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T05A003, June 23–24, 2014

Paper No: ISPS2014-6932

DOI: https://doi.org/10.1115/ISPS2014-6932

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Topics: Bearings, Degrees of freedom, Rotors, Stability, Whirls, Equations of motion, Algebra, Centrifugal force, Finite element methods, Fluids

Proceedings Papers

Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors

Y. H. Jung, G. H. Jang, C. H. Kang, H. H. Shin, J. Y. Jeong

Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T05A004, June 23–24, 2014

Paper No: ISPS2014-6933

DOI: https://doi.org/10.1115/ISPS2014-6933

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Topics: Bubbles, Horizontal directional drilling, Motors, Shapes, Lubricants, Flow (Dynamics), Ball bearings, Bearings, Computers, Design

Proceedings Papers

Monte Carlo Simulation of the Manufacturing Tolerance of FDBs to Identify the Sensitive Design Variables Affecting the Performance of a Disk-Spindle System

J. H. Lee, M. H. Lee, H. K. Jang, G. H. Jang

Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T05A005, June 23–24, 2014

Paper No: ISPS2014-6950

DOI: https://doi.org/10.1115/ISPS2014-6950

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Topics: Design, Disks, Manufacturing, Simulation, Friction, Torque, Journal bearings, Bearings, Clearances (Engineering), Fluids

Proceedings Papers

Robust Hub Design to Prevent Mechanical Contact Between Hub and Sleeve of the FDBs in a 2.5″ HDD With 5mm-Height due to Disc Clamping Force

B. C. Kim, G. H. Jang

Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T05A006, June 23–24, 2014

Paper No: ISPS2014-6993

DOI: https://doi.org/10.1115/ISPS2014-6993

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Topics: Design, Disks, Horizontal directional drilling, Thrust, Deflection, Dimensions, Mechanical structures

Proceedings Papers

Behavior of Micron-Sized Air Bubble in Operating FDBs by Using the Discrete Phase Modeling Method

Y. H. Jung, G. H. Jang, K. M. Jung, C. H. Kang, H. H. Shin

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T05A003, June 24–25, 2013

Paper No: ISPS2013-2863

DOI: https://doi.org/10.1115/ISPS2013-2863

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Topics: Bubbles, Modeling, Lubricants, Bearings, Ball bearings, Computers, Damping, Design, Disks, Engines

Proceedings Papers

Effect of an Hourglass-Shape Tapered Sleeve on the Performance of the Fluid Dynamic Bearings of a HDD Spindle Motor

J. H. Lee, M. H. Lee, G. H. Jang

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T05A005, June 24–25, 2013

Paper No: ISPS2013-2870

DOI: https://doi.org/10.1115/ISPS2013-2870

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Topics: Bearings, Engines, Fluids, Horizontal directional drilling, Motors, Shapes, Pressure, Surface roughness, Disks, Lubricants

Proceedings Papers

Development of a Linear Vibration Motor With Fast Response Time for Mobile Phones

J. H. Nam, T. H. Yeon, G. H. Jang

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T07A003, June 24–25, 2013

Paper No: ISPS2013-2854

DOI: https://doi.org/10.1115/ISPS2013-2854

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Topics: Linear vibration, Motors, Vibration, Actuators, Magnetic fields, Springs, Ampère's law, Computer software, Electricity (Physics), Electromagnetic force

Proceedings Papers

Magnetic Equilibrium Posture of a Multibody Magnetic Microrobot Composed of Spherical Magnets Manipulated by External Magnetic Field

S. M. Jeon, G. H. Jang

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T07A004, June 24–25, 2013

Paper No: ISPS2013-2856

DOI: https://doi.org/10.1115/ISPS2013-2856

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Topics: Equilibrium (Physics), Magnetic fields, Magnets, Surgery, Blood vessels, Cardiovascular system

Proceedings Papers

Noise and Vibration Originated From UMF due to Rotor Eccentricity of the HDD Spindle System

S. J. Sung, G. H. Jang, K. J. Kang

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T05A007, June 24–25, 2013

Paper No: ISPS2013-2946

DOI: https://doi.org/10.1115/ISPS2013-2946

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Topics: Horizontal directional drilling, Noise (Sound), Rotors, Vibration, Torque, Motors, Acoustics, Disks, Analytical methods, Bearings

Proceedings Papers

Robust Optimal Design of the Magnetizer for a HDD Spindle Motor to Reduce the Harmonic Components of the Cogging Torque

C. J. Lee, G. H. Jang, K. B. Kang, D. H. Choi

Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T05A001, June 24–25, 2013

Paper No: ISPS2013-2850

DOI: https://doi.org/10.1115/ISPS2013-2850

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Topics: Design, Horizontal directional drilling, Motors, Torque, Errors, Magnetization, Manufacturing, Disks, Excitation, Noise (Sound)

Proceedings Papers

Dynamic Coefficients of the Coupled Journal and Thrust Bearings Considering Five Degrees of Freedom for a General Rotor-Bearing System

G. H. Jang, S. H. Lee, H. W. Kim

Proc. ASME. IJTC2007, ASME/STLE 2007 International Joint Tribology Conference, Parts A and B, 249-251, October 22–24, 2007

Paper No: IJTC2007-44223

DOI: https://doi.org/10.1115/IJTC2007-44223

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Topics: Bearings, Degrees of freedom, Rotors, Thrust bearings, Damping, Displacement, Perturbation theory, Stiffness, Boundary-value problems, Cavitation

Journal Articles

Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive

G. H. Jang, S. H. Lee, H. W. Kim

J. Tribol. April 2006, 128(2): 335–340.

DOI: https://doi.org/10.1115/1.2162918

Published Online: October 17, 2005

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Topics: Bearings, Boundary-value problems, Disks, Finite element analysis, Pressure, Thrust bearings, Horizontal directional drilling, Stress, Journal bearings, Friction

Journal Articles

Analysis of a Hydrodynamic Bearing of a HDD Spindle Motor at Elevated Temperature

G. H. Jang, K. S. Kim, H. S. Lee, C. S. Kim, Senior Researchers

J. Tribol. April 2004, 126(2): 353–359.

DOI: https://doi.org/10.1115/1.1611500

Published Online: April 19, 2004

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Topics: Bearings, Clearances (Engineering), Engines, Heat conduction, Horizontal directional drilling, Motors, Temperature, Viscosity, Journal bearings, Thermal deformation

Journal Articles

Analysis of a Ball Bearing With Waviness Considering the Centrifugal Force and Gyroscopic Moment of the Ball

G. H. Jang, S. W. Jeong

J. Tribol. July 2003, 125(3): 487–498.

DOI: https://doi.org/10.1115/1.1538618

Published Online: June 19, 2003

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Topics: Ball bearings, Centrifugal force, Oscillating frequencies, Stiffness, Bearings, Stress, Equilibrium (Physics), Vibration, Deflection

Journal Articles

Stability Analysis of a Hydrodynamic Journal Bearing With Rotating Herringbone Grooves

G. H. Jang, J. W. Yoon

J. Tribol. April 2003, 125(2): 291–300.

DOI: https://doi.org/10.1115/1.1506326

Published Online: March 19, 2003

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Topics: Journal bearings, Stability, Stiffness, Damping, Equations of motion, Whirls

Journal citation

NARROW

Evaluation of Mechanical Reliability of Micro Bump in Semiconductors Through a Shear Test

Prediction and Experimental Verification of the Heights of Air-Oil Interfaces in the FDBs in a Tied Shaft of HDDs During Non-Operating Conditions

Effects of the Friction Coefficient of a Barrel on Grinding Performances in Planetary Ball Mill

Sensitivity Analysis on Solder Joint Fatigue Life of Solid State Drives by Finite Element Method and Monte Carlo Simulation

Effect of Additional Harmonics of Driving Current on Torque Ripple and Unbalanced Magnetic Force of the BLDC Motors With Stator and Rotor Eccentricities

Stability Analysis of a Whirling Rigid Rotor Supported by FDBs Considering Five Degrees of Freedom of a General Rotor-Bearing System

Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors

Monte Carlo Simulation of the Manufacturing Tolerance of FDBs to Identify the Sensitive Design Variables Affecting the Performance of a Disk-Spindle System

Robust Hub Design to Prevent Mechanical Contact Between Hub and Sleeve of the FDBs in a 2.5″ HDD With 5mm-Height due to Disc Clamping Force

Behavior of Micron-Sized Air Bubble in Operating FDBs by Using the Discrete Phase Modeling Method

Effect of an Hourglass-Shape Tapered Sleeve on the Performance of the Fluid Dynamic Bearings of a HDD Spindle Motor

Development of a Linear Vibration Motor With Fast Response Time for Mobile Phones

Magnetic Equilibrium Posture of a Multibody Magnetic Microrobot Composed of Spherical Magnets Manipulated by External Magnetic Field

Noise and Vibration Originated From UMF due to Rotor Eccentricity of the HDD Spindle System

Robust Optimal Design of the Magnetizer for a HDD Spindle Motor to Reduce the Harmonic Components of the Cogging Torque

Dynamic Coefficients of the Coupled Journal and Thrust Bearings Considering Five Degrees of Freedom for a General Rotor-Bearing System

Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive

Analysis of a Hydrodynamic Bearing of a HDD Spindle Motor at Elevated Temperature

Analysis of a Ball Bearing With Waviness Considering the Centrifugal Force and Gyroscopic Moment of the Ball

Stability Analysis of a Hydrodynamic Journal Bearing With Rotating Herringbone Grooves

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