Special Issue in Elastohydrodynamics: Remembering Ramsey Gohar
A special issue of Lubricants (ISSN 2075-4442).
Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 50864
Special Issue Editors
Interests: tribology; elastohydrodynamics; contact mechanics
Special Issues, Collections and Topics in MDPI journals
Interests: elastohydrodynamic lubrication; computational mechanics; biomechanics; constitutive relations
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
It is with great sadness that we note the passing of Dr. Ramsey Gohar of Imperial College London on 12th March 2021. Ramsey was one of the pioneering contributors to the fields of contact mechanics and elastohydrodynamic lubrication (EHL). He furthered the fundamental understanding of EHL through the development of state-of-the-art experimental methods and numerical analysis techniques. His innovative works were published in Nature [1], Proceedings of the Royal Society of London [2] and New Scientist [3], as well as in other renowned scientific journals, for example [4–9].
Ramsey’s key research interests encompassed all aspects of EHL and its many applications, including mechanics of concentrated contacts, impact dynamics, ball and rolling element bearings, cam–follower pairs, and journal, thrust, and externally pressurised bearings, to name but a few. His contributions to the fundamentals of EHL and its theoretical formulation, as well as to microscale contact mechanics, were particularly outstanding [1,2,5–11]. In addition, he authored highly regarded books [12,13] for a broad range of audience: from undergraduates, postgraduates and practising engineers to highly accomplished researchers.
With his development of optical interferometric study of EHL [1,14] and use of ultra-thin film micro-miniature transducers under both contacting [15–17] and impacting [18] EHL conditions, Ramsey carved a special place for himself in the history of EHL and bearings.
He was an approachable, helpful, unassuming educator who aided the career of many professionals in both academia and industry, and whose many papers and books will continue to do so well into the future.
As two of his ex-researchers, we invite contributions to this special issue commemorating the many works of an outstanding scientist, Dr. Ramsey Gohar.
Submissions (in the form of original papers, technical notes, and reviews of specific aspects of EHL and contact mechanics) in the following fields are welcome:
- Fundamentals of elastohydrodynamic lubrication (EHL): theoretical developments, measurement techniques including interferometry, spectrometry, thin film technology and its applications in tribology;
- Contact mechanics of semi-infinite and bonded layered elastic solids with particular application to bearings;
- Shaft and bearing systems: rotor dynamics, tribodynamics.
References:
[1] Gohar, R. and Cameron, A., “Optical measurement of oil film thickness under elasto-hydrodynamic lubrication”, Nature, 1963, 200(4905), pp. 458–459.
[2] Cameron, A. and Gohar, R., “Theoretical and experimental studies of the oil film in lubricated point contact”, Proceedings of the Royal Society of London, Series A: Mathematical and Physical Sciences, 1966, 291(1427), pp. 520–536.
[3] Gohar, R. and Thorp, N., “Keeping the bearings rolling (ball and roller bearing fabrication and performance)”, New Scientist, 1977, 74, pp. 124–126.
[4] Gohar, R. and Cameron, A., “The mapping of elastohydrodynamic contacts”, ASLE Transactions, 1967, 10(3), pp. 215–225.
[5] Thorp, N. and Gohar, R., “Oil film thickness and shape for a ball sliding in a grooved raceway”, Trans. ASME, Journal of Tribology, 1972, 94, pp. 199–208
[6] Jalali-Vahid, D., Rahnejat, H., Gohar, R. and Jin, Z.M., “Comparison between experiments and numerical solutions for isothermal elastohydrodynamic point contacts”, Journal of Physics, D: Applied Physics, 1998, 31(20):2725.
[7] Mostofi, A. and Gohar, R., “Oil film thickness and pressure distribution in elastohydrodynamic point contacts”, Proceedings of the Institution of Mechanical Engineers, Journal of Mechanical Engineering Science, 1982, 24(4), pp. 173–182.
[8] Mostofi, A. and Gohar, R., "Elastohydrodynamic lubrication of finite line contacts", Trans. ASME, Journal of Lubrication Technology, 1983, 105(4), pp. 598–604.
[9] Kushwaha, M., Rahnejat, H. and Gohar, R., “Aligned and misaligned contacts of rollers to races in elastohydrodynamic finite line conjunctions”, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2002, 216(11), pp. 1051–1070.
[10] Johns, P.M. and Gohar, R., “Roller bearings under radial and eccentric loads”, Tribology International, 14(3), pp.131–136.
[11] Teodorescu, M., Rahnejat, H., Gohar, R. and Dowson, D., “Harmonic decomposition analysis of contact mechanics of bonded layered elastic solids”, Applied Mathematical Modelling, 2009, 33(1), pp. 467–485.
[12] Gohar, R., “Elastohydrodynamics”, 2nd Edition, World Scientific, Singapore, 2001
[13] Gohar, R. and Rahnejat, H., “Fundamentals of Tribology”, 3rd Edition, World Scientific, London, 2018.
[14] Bahadoran, H. and Gohar, R., “Research note: end closure in elastohydrodynamic line contact”, Proceedings of Institution of Mechanical Engineers, Journal of Mechanical Engineering Science. 1974, 16(4), pp. 276–278.
[15] Johns‐Rahnejat, P.M. and Gohar, R., “Measuring contact pressure distributions under elastohydrodynamic point contacts”, Tribotest, 1994, 1(1), pp. 33–53.
[16] Gohar, R. and Safa, M.M.A., “Measurement of contact pressure under elastohydrodynamic lubrication conditions”, In Tribology and Dynamics of Engine and Powertrain, Woodhead Publishing, 2010, pp. 222–245.
[17] Mohammadpour, M., Johns-Rahnejat, P.M., Rahnejat, H. and Gohar, R., “Boundary conditions for elastohydrodynamics of circular point contacts”, Tribology Letters, 2014, 53(1), pp. 107–118.
[18] Safa, M. M. A. and Gohar, R., "Pressure distribution under a ball impacting a thin lubricant layer", Trans. ASME, Journal of Tribology, 1986, 108(3), pp. 372–376.
Dr. Patricia Johns-Rahnejat
Prof. Dr. Ghodrat Karami
Guest Editors
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Keywords
- elastohydrodynamics
- interferometry and thin film tribotronics
- contact mechanics and contact fatigue
- elastostatics
- tribodynamics
- bearings
- gears
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