Tribology and Dowson

This paper commemorates Ramsey Gohar by acknowledging his contributions to the fields of contact mechanics and elastohydrodynamic lubrication (EHL) within the context of the developments of these subjects. A historical discourse is provided on elastohydrodynamics, from its inception in the 1940s to present. We demonstrate that Ramsey Gohar was not only a pioneer in the discoveries and fundamentals of the subject, but also led or contributed significantly to continual advances in the understanding of EHL and its diverse applications.

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“…Other early solutions include [14,15]. Brief historical accounts of these solutions are provided in [16,17].…”

Section: Observation and Measurements Of Elastohydrodynamic Conditionsmentioning

confidence: 99%

Fundamentals and Advances in Elastohydrodynamics: The Role of Ramsey Gohar

Johns-Rahnejat

Karami

Aini³

et al. 2021

Lubricants

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“…This was an area where there was significant interaction between academia and industry (in this case, medical professionals). As detailed in Morris et al, 27 it was not initially clear what mode of lubrication the hip joints operated in. Some medical practitioners believed the hip joint was boundary lubricated, 28 others believed it was hydrodynamic, 29 while others believed it was there was a 'weeping' lubrication mechanism.…”

Section: Application Of Elastohydrodynamic Lubrication Theorymentioning

confidence: 99%

Duncan Dowson’s impact on industrial tribology

Taylor

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Professor Duncan Dowson had close connections with industry throughout his academic career, and viewed industrial tribological challenges as problems to be solved and as a source of new ideas. Professor Dowson’s famous work on a numerical solution for the lubrication of an elastohydrodynamic line contact, with professor Higginson, was motivated by the need to better understand gear lubrication. These first calculations took 18 months to complete(!), and simpler correlation functions fitted to numerical simulations were developed to enable tribologists in academia and industry to apply elastohydrodynamic lubrication theory without the need for full scale models. Industrial partners such as Shell supplied high-pressure fluid properties required for the elastohydrodynamic calculations (such as the pressure coefficient of viscosity and the way in which lubricant density varies with pressure). Professor Dowson also famously served on the Jost Committee, which quantified, for the first time, the financial impact of tribology, and highlighted that investments in good tribological practices would pay for themselves many times over. It should be remembered that in setting up the Jost Committee, the UK Government specifically asked the committee ‘ to investigate the state of lubrication education and research and to establish the requirements of industry in this regard’. Personal memories of the significant collaborations that I was involved with, as an industrial research scientist, with Leeds University from the mid-1990s to around 2013, which predominantly focused on piston ring tribology are also included as is a brief discussion of the Leeds-Lyon Symposia on Tribology.

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“…He brought a unique foundation in this field, vastly inspiring research and development. In this short review, which extends existing ones, 1,2 we would like to retrace some of the EHL milestones from Professor Dowson and the Leeds Tribology Research Group. As we look at the past, it is fascinating to see the full picture unravelling and the vast amount of knowledge and understanding that has been built over the years.…”

Section: Introductionmentioning

confidence: 99%