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H. Rahnejat
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Proceedings Papers

Constrained Multi-Body Dynamic Analysis of Shaft and Bearing Systems

F. Hoffmann, H. Rahnejat
Proc. ASME. IMECE2001, Vibration and Control of Mechanical Systems, 77-85, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/DE-23210
https://doi.org/10.1115/IMECE2001/DE-23210
View Paper titled, Constrained Multi-Body Dynamic Analysis of Shaft and Bearing Systems
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Topics: Bearings, Dynamic analysis, Dynamics (Mechanics), Spectra (Spectroscopy), Vacuum pumps, Vibration
Proceedings Papers

Elasto-Multi-Body Dynamics of Multi-Cylinder Internal Combustion Engine

S. Gupta, P. Kelly, H. Rahnejat
Proc. ASME. IMECE2001, Vibration and Control of Mechanical Systems, 273-281, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/DE-23234
https://doi.org/10.1115/IMECE2001/DE-23234
View Paper titled, Elasto-Multi-Body Dynamics of Multi-Cylinder Internal Combustion Engine
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Topics: Cylinders, Dynamics (Mechanics), Internal combustion engines, Vibration, Engines, Flywheels, Combustion, Cycles, Deflection, Diesel engines
Journal Articles

Effect of Dispersant Concentration With Friction Modifiers and Anti-Wear Additives on the Tribofilm Composition and Boundary Friction

J. Umer, N. J. Morris, R. Rahmani, H. Rahnejat, S. Howell-Smith, S. Balakrishnan
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. November 2021, 143(11): 111901.
Paper No: TRIB-20-1476
https://doi.org/10.1115/1.4050017
Published Online: February 23, 2021
View Article titled, Effect of Dispersant Concentration With Friction Modifiers and Anti-Wear Additives on the Tribofilm Composition and Boundary Friction
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Topics: Friction, Lubricants, Plasticizers, Temperature, Tribological films, Wear, Strips
Journal Articles

Hydrodynamic Lubricant Film Separation During Codirectional and Counter-Directional Rotations of Disengaged Wet Clutch Packs

N. J. Morris, R. Patel, H. Rahnejat
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. January 2020, 142(1): 011104.
Paper No: FE-19-1196
https://doi.org/10.1115/1.4044443
Published Online: October 4, 2019
View Article titled, Hydrodynamic Lubricant Film Separation During Codirectional and Counter-Directional Rotations of Disengaged Wet Clutch Packs
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Topics: Boundary-value problems, Disks, Drag (Fluid dynamics), Flow (Dynamics), Friction, Lubricants, Rupture, Separation (Technology), Rotation, Torque
Journal Articles

In-Plane and Out-of-Plane Elastodynamics of Thin Rings and Seals

R. Turnbull, R. Rahmani, H. Rahnejat
Journal: Journal of Computational and Nonlinear Dynamics
Publisher: ASME
Article Type: Research-Article
J. Comput. Nonlinear Dynam. August 2019, 14(8): 081006.
Paper No: CND-19-1010
https://doi.org/10.1115/1.4043526
Published Online: May 13, 2019
View Article titled, In-Plane and Out-of-Plane Elastodynamics of Thin Rings and Seals
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Topics: Compression, Dynamics (Mechanics), Elastodynamics, Pistons, Stiffness, Vibration, Frequency response, Friction, Internal combustion engines
Journal Articles

On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring

C. Baker, S. Theodossiades, R. Rahmani, H. Rahnejat, B. Fitzsimons
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2017, 139(6): 062801.
Paper No: GTP-16-1220
https://doi.org/10.1115/1.4035282
Published Online: January 24, 2017
View Article titled, On the Transient Three-Dimensional Tribodynamics of Internal Combustion Engine Top Compression Ring
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Topics: Compression, Cylinders, Dynamics (Mechanics), Engines, Friction, Lubricants, Pistons, Pressure, Transients (Dynamics), Temperature
Journal Articles

A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact

N. Morris, R. Rahmani, H. Rahnejat, P. D. King, S. Howell-Smith
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. April 2016, 138(2): 021703.
Paper No: TRIB-15-1087
https://doi.org/10.1115/1.4031780
Published Online: November 4, 2015
View Article titled, A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact
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Topics: Compression, Cylinders, Engines, Friction, Lubricants, Pistons, Pressure, Lubrication, Piston rings, Surface texture
Journal Articles

On the Effect of Transient In-Plane Dynamics of the Compression Ring Upon Its Tribological Performance

C. Baker, R. Rahmani, S. Theodossiades, H. Rahnejat, B. Fitzsimons
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2015, 137(3): 032512.
Paper No: GTP-14-1296
https://doi.org/10.1115/1.4028496
Published Online: October 14, 2014
View Article titled, On the Effect of Transient In-Plane Dynamics of the Compression Ring Upon Its Tribological Performance
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Topics: Compression, Cylinders, Dynamics (Mechanics), Engines, Friction, Lubricants, Pressure, Temperature, Transients (Dynamics), Tribology
Journal Articles

Multiphysics Investigations on the Dynamics of Differential Hypoid Gears

M. Mohammadpour, S. Theodossiades, H. Rahnejat
Journal: Journal of Vibration and Acoustics
Publisher: ASME
Article Type: Research-Article
J. Vib. Acoust. August 2014, 136(4): 041007.
Paper No: VIB-13-1420
https://doi.org/10.1115/1.4027403
Published Online: April 30, 2014
View Article titled, Multiphysics Investigations on the Dynamics of Differential Hypoid Gears
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Topics: Bearings, Damping, Dynamics (Mechanics), Friction, Gears, Spiral bevel gears, Stiffness, Stress, Torque, Vehicles
Proceedings Papers

Prediction of Load and Shear of Ultra-Thin Multi-Species Surface Films

W. W. F. Chong, M. Teodorescu, H. Rahnejat
Proc. ASME. IDETC-CIE2012, Volume 5: 6th International Conference on Micro- and Nanosystems; 17th Design for Manufacturing and the Life Cycle Conference, 241-246, August 12–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: DETC2012-71317
https://doi.org/10.1115/DETC2012-71317
View Paper titled, Prediction of Load and Shear of Ultra-Thin Multi-Species Surface Films
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Topics: Shear (Mechanics), Stress, Thin films, Adhesion, Friction, Intermolecular forces, Microscale devices, Contact mechanics, Fluids, Liquid films
Proceedings Papers

The Role of Laser Surface Textured Patterns on Friction in Reciprocating Contacts

M. De la Cruz, M. Gore, N. Morris, H. Rahnejat
Proc. ASME. IJTC2012, ASME/STLE 2012 International Joint Tribology Conference, 71-73, October 7–10, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2012-61149
https://doi.org/10.1115/IJTC2012-61149
View Paper titled, The Role of Laser Surface Textured Patterns on Friction in Reciprocating Contacts
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Topics: Friction, Lasers
Proceedings Papers

Prediction of Ring-Bore Conformance and Contact Condition and Experimental Validation

M. Theaker, R. Rahmani, H. Rahnejat
Proc. ASME. ICES2012, ASME 2012 Internal Combustion Engine Division Spring Technical Conference, 885-892, May 6–9, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICES2012-81021
https://doi.org/10.1115/ICES2012-81021
View Paper titled, Prediction of Ring-Bore Conformance and Contact Condition and Experimental Validation
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Topics: Combustion, Combustion chambers, Compression, Cylinders, Flow (Dynamics), Friction, Gas flow, Gaussian distribution, Heat, Internal combustion engines
Proceedings Papers

Measurement of In-Cylinder Friction Using the Floating Liner Principle

M. Gore, S. J. Howell-Smith, P. D. King, H. Rahnejat
Proc. ASME. ICES2012, ASME 2012 Internal Combustion Engine Division Spring Technical Conference, 901-906, May 6–9, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICES2012-81028
https://doi.org/10.1115/ICES2012-81028
View Paper titled, Measurement of In-Cylinder Friction Using the Floating Liner Principle
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Topics: Cylinders, Friction, Engines, Lubrication, Pressure, Transients (Dynamics), Accelerometers, Bearings, Combustion, Design
Proceedings Papers

Assessment of Friction for Cam-Roller Follower Valve Train System Subjected to Mixed Non-Newtonian Regime of Lubrication

A. Turturro, R. Rahmani, H. Rahnejat, C. Delprete, L. Magro
Proc. ASME. ICES2012, ASME 2012 Internal Combustion Engine Division Spring Technical Conference, 917-923, May 6–9, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICES2012-81050
https://doi.org/10.1115/ICES2012-81050
View Paper titled, Assessment of Friction for Cam-Roller Follower Valve Train System Subjected to Mixed Non-Newtonian Regime of Lubrication
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Topics: Dynamics (Mechanics), Friction, Lubrication, Rollers, Trains, Valves
Proceedings Papers

Friction Under Transient Mixed Regime of Lubrication in Conjunction of an Elastic Ring Within a Real Cylinder

C. E. Baker, S. Theodossiades, H. Rahnejat
Proc. ASME. ICES2012, ASME 2012 Internal Combustion Engine Division Spring Technical Conference, 667-672, May 6–9, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICES2012-81045
https://doi.org/10.1115/ICES2012-81045
View Paper titled, Friction Under Transient Mixed Regime of Lubrication in Conjunction of an Elastic Ring Within a Real Cylinder
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Topics: Cylinders, Friction, Lubrication, Transients (Dynamics), Compression, Engines, Manufacturing, Tribology, Arches, Circular cylinders
Proceedings Papers

Assessment of Thermo-Structural Effects on EHL Piston Skirt Lubrication

B. Littlefair, S. Howell-Smith, H. Rahnejat, S. Theodossiades
Proc. ASME. ICES2012, ASME 2012 Internal Combustion Engine Division Spring Technical Conference, 973-978, May 6–9, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICES2012-81125
https://doi.org/10.1115/ICES2012-81125
View Paper titled, Assessment of Thermo-Structural Effects on EHL Piston Skirt Lubrication
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Topics: Lubrication, Pistons, Lubricants, Shapes, Stress, Cylinders, Deformation, Friction, Fuel efficiency, Operating temperature
Journal Articles

Influence of In-Plane Dynamics of Thin Compression Rings on Friction in Internal Combustion Engines

C. E. Baker, S. Theodossiades, H. Rahnejat, B. Fitzsimons
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Internal Combustion Engines
J. Eng. Gas Turbines Power. September 2012, 134(9): 092801.
https://doi.org/10.1115/1.4006690
Published Online: July 18, 2012
View Article titled, Influence of In-Plane Dynamics of Thin Compression Rings on Friction in Internal Combustion Engines
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Topics: Compression, Dynamics (Mechanics), Friction, Tribology, Lubrication, Pressure, Transients (Dynamics), Mode shapes, Engines
Proceedings Papers

Influence of Ultra-Thin Film Tribology on Hard Disk Areal Storage Capacity

W. W. F. Chong, M. Teodorescu, H. Rahnejat
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 17-19, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41128
https://doi.org/10.1115/IJTC2010-41128
View Paper titled, Influence of Ultra-Thin Film Tribology on Hard Disk Areal Storage Capacity
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Topics: Disks, Storage, Tribology, Lubricants, Data storage systems, Density, Load bearing capacity, Cavitation, Fluids, Pressure
Proceedings Papers

Post-Angioplastic Contact Mechanics With Different Levels of Artherosclerotic Plaque

M. Teodorescu, H. Rahnejat, Moshe Brand, Jacob Rosen
Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 41-43, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41145
https://doi.org/10.1115/IJTC2010-41145
View Paper titled, Post-Angioplastic Contact Mechanics With Different Levels of Artherosclerotic Plaque
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Topics: Contact mechanics, Geometry, Stents, Stress, Surgery
Proceedings Papers

Harmonic Analysis to Determine Contact Characteristics of Concentrated Counterformal Contacts

M. Teodorescu, H. Rahnejat, R. Gohar
Proc. ASME. ESDA2004, Volume 1, 663-668, July 19–22, 2004
Publisher: American Society of Mechanical Engineers
Paper No: ESDA2004-58544
https://doi.org/10.1115/ESDA2004-58544
View Paper titled, Harmonic Analysis to Determine Contact Characteristics of Concentrated Counterformal Contacts
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Topics: Approximation, Bearings, Contact mechanics, Deformation, Elastic moduli, Elasticity, Elastohydrodynamic lubrication, Fatigue, Friction, Geometry