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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2021-65058
https://doi.org/10.1115/ISPS2021-65058
View Paper titled, Evaluation of Mechanical Reliability of Micro Bump in Semiconductors Through a Shear Test
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2017-5427
https://doi.org/10.1115/ISPS2017-5427
View Paper titled, Prediction and Experimental Verification of the Heights of Air-Oil Interfaces in the FDBs in a Tied Shaft of HDDs During Non-Operating Conditions
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2017-5470
https://doi.org/10.1115/ISPS2017-5470
View Paper titled, Effects of the Friction Coefficient of a Barrel on Grinding Performances in Planetary Ball Mill
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2017-5453
https://doi.org/10.1115/ISPS2017-5453
View Paper titled, Sensitivity Analysis on Solder Joint Fatigue Life of Solid State Drives by Finite Element Method and Monte Carlo Simulation
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Topics: Fatigue life, Finite element methods, Sensitivity analysis, Simulation, Solder joints, Solders, Excitation, Corners (Structural elements), Design, Fatigue
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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6950
https://doi.org/10.1115/ISPS2014-6950
View Paper titled, Monte Carlo Simulation of the Manufacturing Tolerance of FDBs to Identify the Sensitive Design Variables Affecting the Performance of a Disk-Spindle System
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6993
https://doi.org/10.1115/ISPS2014-6993
View Paper titled, 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
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Topics: Design, Disks, Horizontal directional drilling, Thrust, Deflection, Dimensions, Mechanical structures
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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6913
https://doi.org/10.1115/ISPS2014-6913
View Paper titled, Effect of Additional Harmonics of Driving Current on Torque Ripple and Unbalanced Magnetic Force of the BLDC Motors With Stator and Rotor Eccentricities
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6932
https://doi.org/10.1115/ISPS2014-6932
View Paper titled, Stability Analysis of a Whirling Rigid Rotor Supported by FDBs Considering Five Degrees of Freedom of a General Rotor-Bearing System
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6933
https://doi.org/10.1115/ISPS2014-6933
View Paper titled, Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors
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Topics: Bubbles, Horizontal directional drilling, Motors, Shapes, Lubricants, Flow (Dynamics), Ball bearings, Bearings, Computers, Design
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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2863
https://doi.org/10.1115/ISPS2013-2863
View Paper titled, Behavior of Micron-Sized Air Bubble in Operating FDBs by Using the Discrete Phase Modeling Method
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2870
https://doi.org/10.1115/ISPS2013-2870
View Paper titled, Effect of an Hourglass-Shape Tapered Sleeve on the Performance of the Fluid Dynamic Bearings of a HDD Spindle Motor
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2854
https://doi.org/10.1115/ISPS2013-2854
View Paper titled, Development of a Linear Vibration Motor With Fast Response Time for Mobile Phones
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2856
https://doi.org/10.1115/ISPS2013-2856
View Paper titled, Magnetic Equilibrium Posture of a Multibody Magnetic Microrobot Composed of Spherical Magnets Manipulated by External Magnetic Field
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2946
https://doi.org/10.1115/ISPS2013-2946
View Paper titled, Noise and Vibration Originated From UMF due to Rotor Eccentricity of the HDD Spindle System
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2850
https://doi.org/10.1115/ISPS2013-2850
View Paper titled, Robust Optimal Design of the Magnetizer for a HDD Spindle Motor to Reduce the Harmonic Components of the Cogging Torque
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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
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2007-44223
https://doi.org/10.1115/IJTC2007-44223
View Paper titled, Dynamic Coefficients of the Coupled Journal and Thrust Bearings Considering Five Degrees of Freedom for a General Rotor-Bearing System
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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
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. April 2006, 128(2): 335–340.
https://doi.org/10.1115/1.2162918
Published Online: October 17, 2005
View Article titled, Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive
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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
Journal: Journal of Tribology
Publisher: ASME
Article Type: Technical Papers
J. Tribol. April 2004, 126(2): 353–359.
https://doi.org/10.1115/1.1611500
Published Online: April 19, 2004
View Article titled, Analysis of a Hydrodynamic Bearing of a HDD Spindle Motor at Elevated Temperature
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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
Journal: Journal of Tribology
Publisher: ASME
Article Type: Technical Papers
J. Tribol. July 2003, 125(3): 487–498.
https://doi.org/10.1115/1.1538618
Published Online: June 19, 2003
View Article titled, Analysis of a Ball Bearing With Waviness Considering the Centrifugal Force and Gyroscopic Moment of the Ball
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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
Journal: Journal of Tribology
Publisher: ASME
Article Type: Technical Papers
J. Tribol. April 2003, 125(2): 291–300.
https://doi.org/10.1115/1.1506326
Published Online: March 19, 2003
View Article titled, Stability Analysis of a Hydrodynamic Journal Bearing With Rotating Herringbone Grooves
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Topics: Journal bearings, Stability, Stiffness, Damping, Equations of motion, Whirls