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Proceedings Papers

Self-Excited Vibration Model of Dragonfly’s Wing Based on the Concept of Bionic Design for Small- or Micro-Sized Actuators

Sagiri Ishimoto, Hiromu Hashimoto
Proc. ASME. DETC97, Volume 1D: 16th Biennial Conference on Mechanical Vibration and Noise, V01DT25A008, September 14–17, 1997
Publisher: American Society of Mechanical Engineers
Paper No: DETC97/VIB-4185
https://doi.org/10.1115/DETC97/VIB-4185
View Paper titled, Self-Excited Vibration Model of Dragonfly’s Wing Based on the Concept of Bionic Design for Small- or Micro-Sized Actuators
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Topics: Actuators, Bionics, Design, Vibration, Wings
Proceedings Papers

Vibration Analysis of High Speed Stepped Thrust Gas Film Bearings With Inertia Effects

Masayuki Ochiai, Hiromu Hashimoto
Proc. ASME. DETC97, Volume 1B: 16th Biennial Conference on Mechanical Vibration and Noise, V01BT07A013, September 14–17, 1997
Publisher: American Society of Mechanical Engineers
Paper No: DETC97/VIB-4047
https://doi.org/10.1115/DETC97/VIB-4047
View Paper titled, Vibration Analysis of High Speed Stepped Thrust Gas Film Bearings With Inertia Effects
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Topics: Bearings, Inertia (Mechanics), Thrust, Vibration, Vibration analysis
Proceedings Papers

Optimum Design of Magnetic Head Slider Under Static and Dynamic Operation Conditions of Hard Disk Drive

Yasuhisa Hattori, Hiromu Hashimoto, Masayuki Ochiai
Proc. ASME. DETC99, Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise, 1125-1134, September 12–16, 1999
Publisher: American Society of Mechanical Engineers
Paper No: DETC99/VIB-8283
https://doi.org/10.1115/DETC99/VIB-8283
View Paper titled, Optimum Design of Magnetic Head Slider Under Static and Dynamic Operation Conditions of Hard Disk Drive
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Topics: Design, Disks, Magnetic heads
Proceedings Papers

Compressibility Effects on the Static and Dynamic Characteristics in Stepped Thrust Gas Film Bearings

Hiromu Hashimoto, Masayukl Ochiai
Proc. ASME. DETC99, Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise, 935-943, September 12–16, 1999
Publisher: American Society of Mechanical Engineers
Paper No: DETC99/VIB-8278
https://doi.org/10.1115/DETC99/VIB-8278
View Paper titled, Compressibility Effects on the Static and Dynamic Characteristics in Stepped Thrust Gas Film Bearings
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Topics: Bearings, Compressibility, Thrust
Proceedings Papers

Optimization of Thin-Film Winding Conditions Considering Viscoelastic Property and Thickness Variation and its Experimental Verification

Yuta Sunami, Hiromu Hashimoto
Proc. ASME. ISPS-MIPE2018, ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment, V001T07A005, August 29–30, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ISPS-MIPE2018-8563
https://doi.org/10.1115/ISPS-MIPE2018-8563
View Paper titled, Optimization of Thin-Film Winding Conditions Considering Viscoelastic Property and Thickness Variation and its Experimental Verification
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Topics: Optimization, Thin films, Viscoelasticity, Winding (process), Stress, Plastic films, Diluents, Gages, Tension
Proceedings Papers

Groove Shape Optimization of Thrust Air Bearing for Small Size Spindle Considering the Processing Errors

Masayuki Ochiai, Naoya Kato, Hiromu Hashimoto
Proc. ASME. ISPS-MIPE2018, ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment, V001T02A002, August 29–30, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ISPS-MIPE2018-8549
https://doi.org/10.1115/ISPS-MIPE2018-8549
View Paper titled, Groove Shape Optimization of Thrust Air Bearing for Small Size Spindle Considering the Processing Errors
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Topics: Air bearings, Errors, Shape optimization, Thrust, Lasers, Machining, Thrust bearings, Engines, Microfabrication, Motors
Proceedings Papers

Study on Fabrication of Porous Nanosheets by Roll Nanoimprinting Method

Go Kamimura, Sheng Zhang, Kazuyoshi Tsuchiya, Hiromu Hashimoto, Yuta Sunami
Proc. ASME. ISPS-MIPE2018, ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment, V001T07A007, August 29–30, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ISPS-MIPE2018-8574
https://doi.org/10.1115/ISPS-MIPE2018-8574
View Paper titled, Study on Fabrication of Porous Nanosheets by Roll Nanoimprinting Method
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Topics: Manufacturing, Heating, Ethanol, Film thickness, Plastic films, Polymers, Pressing, Printing, Resins, Rollers
Journal Articles

Robust Optimum Design of Fluid Dynamic Bearing for Hard Disk Drive Spindle Motors

Hiromu Hashimoto, Masayuki Ochiai, Yuta Sunami
Journal: Journal of Tribology
Publisher: ASME
Article Type: Applications
J. Tribol. October 2012, 134(4): 041102.
https://doi.org/10.1115/1.4007246
Published Online: August 23, 2012
View Article titled, Robust Optimum Design of Fluid Dynamic Bearing for Hard Disk Drive Spindle Motors
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Topics: Bearings, Design, Motors, Friction, Torque
Proceedings Papers

Robust Optimum Design of Fluid Dynamic Bearing for 2.5 Inch HDD Using Statistical Method

Hiromu Hashimoto, Masayuki Ochiai, Yuta Sunami
Proc. ASME. IJTC2011, ASME/STLE 2011 Joint Tribology Conference, 123-125, October 24–26, 2011
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2011-61063
https://doi.org/10.1115/IJTC2011-61063
View Paper titled, Robust Optimum Design of Fluid Dynamic Bearing for 2.5 Inch HDD Using Statistical Method
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Topics: Bearings, Design, Fluids, Horizontal directional drilling, Errors, Manufacturing, Motors, Mass production, Optimization
Proceedings Papers

Experimental Study on Preventing Web Defects Under Transportation of High Performance Optical Films With Micro-Groove and Concave Rollers

Hiromu Hashimoto
Proc. ASME. IJTC2011, ASME/STLE 2011 Joint Tribology Conference, 127-129, October 24–26, 2011
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2011-61065
https://doi.org/10.1115/IJTC2011-61065
View Paper titled, Experimental Study on Preventing Web Defects Under Transportation of High Performance Optical Films With Micro-Groove and Concave Rollers
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Topics: Optical films, Rollers, Transportation systems
Proceedings Papers

Optimum Design of Fluid Film Bearing for HDD Spindle Considering the Tolerances

Yuta Sunami, Masayuki Ochiai, Hiromu Hashimoto
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 115-117, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41086
https://doi.org/10.1115/IJTC2010-41086
View Paper titled, Optimum Design of Fluid Film Bearing for HDD Spindle Considering the Tolerances
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Topics: Bearings, Design, Fluid films, Horizontal directional drilling, Mass production, Noise (Sound), Optimization, Sensitivity analysis
Proceedings Papers

Optimum Design of Small Size Fluid Film Thrust Bearing Considering the Productivity

Yuta Sunami, Hiromu Hashimoto
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 119-121, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41087
https://doi.org/10.1115/IJTC2010-41087
View Paper titled, Optimum Design of Small Size Fluid Film Thrust Bearing Considering the Productivity
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Topics: Design, Fluid films, Thrust bearings, Bearings, Stiffness, Errors, Manufacturing, Film thickness, Machining, Optimization
Journal Articles

Theoretical Modeling for Microgrooved Journal Bearings Under Mixed Lubrication

Katsuhiro Ashihara, Hiromu Hashimoto
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2010, 132(4): 042101.
https://doi.org/10.1115/1.4002214
Published Online: October 7, 2010
View Article titled, Theoretical Modeling for Microgrooved Journal Bearings Under Mixed Lubrication
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Topics: Bearings, Friction, Lubrication, Stress, Journal bearings
Journal Articles

Stabilization Method for Small-Bore Journal Bearings Utilizing Starved Lubrication

Hiromu Hashimoto, Masayuki Ochiai
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011703.
https://doi.org/10.1115/1.4000269
Published Online: November 17, 2009
View Article titled, Stabilization Method for Small-Bore Journal Bearings Utilizing Starved Lubrication
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Topics: Bearings, Flow (Dynamics), Journal bearings, Lubrication, Stability, Trajectories (Physics), Theoretical analysis
Journal Articles

Optimization of Wind-Up Tension of Webs Preventing Wrinkles and Slippage

Hiromu Hashimoto
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Technical Briefs
J. Manuf. Sci. Eng. October 2009, 131(5): 054501.
https://doi.org/10.1115/1.4000096
Published Online: September 23, 2009
View Article titled, Optimization of Wind-Up Tension of Webs Preventing Wrinkles and Slippage
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Topics: Optimization, Stress, Tension, Wind, Winding (process)
Journal Articles

Optimization of Groove Geometry for a Thrust Air Bearing According to Various Objective Functions

Hiromu Hashimoto, Tadashi Namba
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2009, 131(4): 041704.
https://doi.org/10.1115/1.3201860
Published Online: September 22, 2009
View Article titled, Optimization of Groove Geometry for a Thrust Air Bearing According to Various Objective Functions
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Topics: Bearings, Design, Geometry, Optimization, Friction, Torque, Stiffness, Thrust
Proceedings Papers

A Performance Prediction of Microgrooved Bearings Under Mixed Lubrication

Katsuhiro Ashihara, Hiromu Hashimoto
Proc. ASME. IJTC2008, STLE/ASME 2008 International Joint Tribology Conference, 315-317, October 20–22, 2008
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2008-71073
https://doi.org/10.1115/IJTC2008-71073
View Paper titled, A Performance Prediction of Microgrooved Bearings Under Mixed Lubrication
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Topics: Bearings, Lubrication, Pressure, Film thickness, Fluids, Stress, Alloys, Automobiles, Deformation, Engines
Proceedings Papers

Optimization of Groove Geometry for Thrust Air Bearing According to Various Objective Functions

Hiromu Hashimoto, Masayuki Ochiai, Tadashi Namba
Proc. ASME. IJTC2008, STLE/ASME 2008 International Joint Tribology Conference, 327-329, October 20–22, 2008
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2008-71093
https://doi.org/10.1115/IJTC2008-71093
View Paper titled, Optimization of Groove Geometry for Thrust Air Bearing According to Various Objective Functions
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Topics: Air bearings, Geometry, Optimization, Thrust, Design, Film thickness, Friction, Stiffness, Torque, Bearings
Proceedings Papers

A Rapid Method of Numerical Calculation for Oil Film Temperature in Engine Bearings

Katsuhiro Ashihara, Hiromu Hashimoto
Proc. ASME. IJTC2007, ASME/STLE 2007 International Joint Tribology Conference, Parts A and B, 257-259, October 22–24, 2007
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2007-44233
https://doi.org/10.1115/IJTC2007-44233
View Paper titled, A Rapid Method of Numerical Calculation for Oil Film Temperature in Engine Bearings
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Topics: Bearings, Engines, Temperature, Film thickness, Automobiles, Deformation, Design, High pressure (Physics), Lubrication, Modeling
Proceedings Papers

Optimization of Groove Geometry for Thrust Air Bearing to Maximize Bearing Stiffness

Hiromu Hashimoto, Masayuki Ochiai, Tadashi Nanba
Proc. ASME. IJTC2007, ASME/STLE 2007 International Joint Tribology Conference, Parts A and B, 225-227, October 22–24, 2007
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2007-44129
https://doi.org/10.1115/IJTC2007-44129
View Paper titled, Optimization of Groove Geometry for Thrust Air Bearing to Maximize Bearing Stiffness
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Topics: Air bearings, Bearings, Geometry, Optimization, Stiffness, Thrust, Thrust bearings, Design, Design methodology, Excitation