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Refinement of Engine In-Cycle Losses of Parasitic and Errant Dynamic Nature

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Encyclopaedic Participation
Members of the Encyclopaedic Team have presented work at the following conferences and peer reviewed scientific journals:

Paper or Presentation 

 IMechE part J, Journal of Engineering Tribology

Mills, R.S., Avan,E.Y., and Dwyer-Joyce, R.S.,  (2012), Piezo-electric sensors to monitor lubricant film thickness at piston-cylinder contacts in a fired engine, Proc of IMechE part J, Journal of Engineering Tribology, Vol. 227, No. 2, pp. 100-111.( DOI: 10.1177/1350650112464833)


 Avan, E.Y., Spencer, A., Dwyer-Joyce, R.S., Almqvist, A., and Larsson, R., (2012), Experimental and Numerical Investigations of a Simulated Piston Ring-Liner Contact Proc of IMechE part J, Journal of Engineering Tribology, Vol. 227, No. 2, pp. 126-140.( DOI: 10.1177/1350650112464706)

 SAE International Journal of Fuels and Lubricants

 Avan, E.Y., Mills, R.S.,  and Dwyer-Joyce, R.S.,  (2010), Ultrasonic Imaging of the Piston Ring Oil Film during operation in a Motored Engine – Towards Oil Film Measurement, SAE paper 2010-01-2179. SAE International Journal of Fuels and Lubricants, Vol. 3, No. 2, pp. 786-793, (doi: 10.4271/2010-01-2179)

 Journal of Physics D: Applied Physics

W.W.F. Chong, M. Teodorescu and H. Rahnejat "Formation of ultra-thin bi-molecular boundary adsorbed films" 45(11):115303, 2012

W.W.F. Chong, M. Teodorescu and H. Rahnejat "Effect of lubricant molecular rheology on formation and shear of ultra-thin surface films.  

Tribology International


W.W.F. Chong, M. Teodorescu and N.D. Vaughan "Cavitation induced starvation for piston ring/liner tribological conjunctions" 44(4): 483-497, 2011, 

 Morris, N., Rahmani, R., Rahnejat, H., King, P., Fitzsimons, B."Tribology of Piston Compression Ring Conjunction under Transient Thermal Mixed Regime of Lubrication"  2011-12

Proceedings of the Institution of Mechanical Engineers, Part J

 Morris, N., Rahmani, R., Rahnejat, H., King, P.D., Fitzsimons, B."The Influence of Piston Ring Geometry and Topography on Friction"  2012

 Rahmani, R., Rahnejat, H., King, P., Fitzsimons, "Transient Elastohydrodynamic Lubrication of Rough New or Worn Piston Compression Ring Conjunction with an Out-of-Round Cylinder Bore" DOI: 10.1177/1350650111431028 hwp:master-id:sppij  ;1350650111431028 Pages: 284-305 , B.Journal of Engineering Tribology, 2012


International Joint Tribology Conference
Date: 8 - 10 October 2012
Location: Denver, Colorado USA 

Miguel De la Cruz, Nick Morris, Mike Gore, Homer Rahnejat, "The Role of Laser Surface Texture Patterns on Friction in Reciprocating Contacts"



Date: 23 - 26 September

Location: Vancouver, Canada

 R. Rahmani, G.Styles, H. Rahnejat "Meniscus Formation in the Piston Compression Ring-Cylinder Liner Inlet Zone"

15th Nordic Symposium on Tribology
Date: 12 - 15 June 2012
Location: Trondheim, Norway

M. Gore, Paul King, H. Rahnejat,  "Direct measurement of friction from piston-bore conjunctions of a high performance engine"  


B. Littlefair, H. Rahnejat, S. Theodossiades, S. Howell-Smith, "Comparison of calculated skirt friction with isolated-driven floating liner force measurements"  


G.Styles, R. Rahmani, Homer Rahnejat, B. Fitzsimons, "Assessment of asperity coefficient of friction for various coating materials used in pistonr ring/liner conjunction using AFM"

ASME 2012
Date: 06 - 09 May 2012
Location: Torino, Italy


Turturro, A., Rahmani, R., Rahnejat, H., Delprete, C., Magro, L,  "Assessment of friction for cam-roller follower valve train system subjected to mixed non-Newtonian regime of lubrication" ICES201281050


N. Morris "Performance evaluation of piston compression ring through accelerated wear in engine tests"  ICES201281201 


Theaker, M., Rahmani, R., Rahnejat, H. "Prediction of ringbore conformance and contact condition and experimental validation" ICES201281021


M Gore "Measurement of In-Cylinder Friction Using the Floating Liner Principle" ICES201281028 


C. Baker "Friction Under Transient Mixed Regime of Lubrication in Conjunction of an Elastic Ring Within a Real Cylinder"  ICES201281045 


 B Littlefair, "Assessment of Thermo-Structural effects on EHL Piston Skirt Lubrication" ICES201281125 

Tribology Faraday Discussion
Date: 2 - 4 April 2012
Event Type: Conference
Location: University of Southampton, UK

W Chong, M Teodorescu and H Rahnejat, "Physio-chemical hydrodynamic mechanism underlying the formation of thin adsorbed boundary films" DOI: 10.1039/C2FD00118G 


 Date: 24 - 26 October 2011

Event Type: Conference
Location: Los Angeles California USA

Morris, N., Rahmani, R., Rahnejat, H., King, P,  “Optimizing Piston Ring Topography to Minimize Running-in Wear in Mixed Regime of Lubrication”  



Chidlow, W.W.F. Chong, M. Teodorescu, N. D. Vaughan, "Adhesive Contacts for Gradedelastic Coatings using Fourier Series Decomposition" Paper no. IJTC2011-61112 pp. 285-287 10.1115/IJTC2011-61112 ISBN: 978-0-7918-5474-7 S.

Location: INSA Lyon - LaMCoS, Villeurbanne France

Morris, N., Rahmani, R., Rahnejat, H., King, P., Fitzsimons, B. "Tribology of Piston Compression Ring Conjunction under Transient Thermal Mixed Regime of Lubrication"



E.Y. Avan, W.W.F. Chong, R. Mills, R.S. Dwyer-Joyce and M. Teodorescu "Experimental and numerical investigations on a simulated piston ring-liner contact, 38th Leeds-Lyon Symposium on Tribology"  



The European Conference on Tribology

Date 7 - 9 June 2011

Location: Vienna, Austria

 B. Littlefair, S. Howell-Smith, S. Theodossiades, P.D. King and H. Rahnejat"Tribology of Piston Skirt Conjunction" 


 N. Morris, R. Rahmani and H. Rahnejat “Tribology of Partial Pad Journal Bearings with Textured Surfaces”



66th Meeting & Exhibition
Date: 15 - 19 May 2011
Location: Atlanta Ga. USA

 M. Gore, G. Styles, P.D. King and H. Rahnejat, "Wear Characteristics of Advanced Honed and Cross-Hatched Coated Cylinder Liners" ISBN: 978-1-61839-105-6 P 214  


C.E. Baker*, R. Rahmani, S. Theodossiades and H. Rahnejat "Analytical Evaluation Of Fitted Piston Compression Ring Modal Behaviour and Frictional Assessment" Technical Paper 2011-01-1535, 2011, doi:10.4271/2011-01-1535.

C.E. Baker, R. Rahmani, S. Theodossiades, H. Rahnejat and B. Fitzsimons“Thermo-Elastohydrodynamics of Rough Piston Compression Ring-To-Cylinder Bore Conjunction” ISBN: 978-1-61839-105-6 P 182

International 2011 World Congress
Date: 12 - 14 April 2011
Location: Detroit, Michigan USA

Avan, E.Y., Mills, R.S.,  and Dwyer-Joyce, R.S.,  (2011), Frictional Characteristics of Ultrasonically Measured Lubricant Films in a Simulated Piston Ring Liner Contact, SAE 11PFL-0608/2011-01-1400. 


International Joint Triblogy Conference

Date: 17 - 20 October 2010

Location: San Francisco California, USA

S. J. Chidlow,  M. Teodorescu, N. D. Vaughan, "A New Solution Method for the Contact Mechanics of Graded Coatings” Paper no. IJTC2010-41131 pp. 317-319 ISBN: 978-0-7918-4419-9  


W.W.F. Chong, M. Teodorescu and H. Rahnejat, "Influence of ultra-thin film tribology on hard disk areal storage" Paper no. IJTC2010-41128 pp. 17-19  ISBN: 978-0-7918-4


W.W.F. Chong, M. Teodorescu, N. D. Vaughan, “Piston Ring Cavitation and Starvation During Entrainment Motion Reversal” Paper no. IJTC2010-41099 pp. 123-125 978-0-7918-4419-9


Date 15 - 18 August 2010

Location: Montreal, Quebec, Canada

W.W.F. Chong,  M. Teodorescu and H. Rahnejat  “Rupture and Reformation of Ultra-Thin Surface Films” Paper no. DETC2010-28427 pp. 401-407  ISBN: 978-0-7918-4412-0