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Publication
Featured researches published by John Howard Tripp.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | 2001
Pieter Martin Lugt; R.W.M. Severt; J. Fogelström; John Howard Tripp
Abstract The influence of surface topography on the lubricant film build-up ability and the friction characteristics of potential rolling bearing surfaces has been investigated by experiments on two-disc rigs. Traction-friction torque measurements were made for a variety of surface combinations, together with measurement of the electrical resistance between the discs as an indication of surface separation. For all disc combinations, running-in of the surfaces under load at any slide-roll ratio led eventually to full film separation. Contrary to results reported in the literature, film breakdown did not always increase with slip but depended on certain aspects of the surface structure. Friction torque measurements in the mixed lubrication regime also confirmed that friction is not determined simply by an Ra value. By suitable modification of the surface topography, keeping Ra constant, friction can be varied by as much as 10 per cent.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology | 2000
B.C. Jacod; Pieter Martin Lugt; Marie-Laure Dumont; John Howard Tripp; Cornelis H. Venner
Abstract This paper presents a first extension of the amplitude reduction approach, where the deformation of harmonic components of the roughness is considered, to non-Newtonian elastohydrodynamic lubrication (EHL) line contact. The amplitude reduction of one-sided waviness is computed as a function of the slide-roll ratio. Non-Newtonian effects result in an increase in the deformation for positive slide-roll ratios. This contrasts with published results using a Newtonian fluid where the deformation decreased for such conditions. Moreover, the amplitude reduction varies significantly throughout the contact, requiring an additional parameter for the characterization of the amplitude reduction. An explanation of these differences based on the velocity profile of the lubricant inside the contact concludes the paper.
Archive | 1998
Alexander Jan Carel De Vries; Arimin Herbert Emil August Olschewski; John Howard Tripp; Pieter Martin Lugt
Proceedings of the International Tribology Conference | 2001
J.W. Sloetjes; Dirk J. Schipper; Pieter Martin Lugt; John Howard Tripp; Kazunori Ichimar
Archive | 2001
Pieter Martin Lugt; Eusthatios Ioannides; Ingrid Victoria Wikström; John Howard Tripp; Marie-Laure Dumont; Antonio Gabelli; B.C. Jacod
Archive | 2002
Alexander Jan Carel De Vries; Armin Olschewski; John Howard Tripp; Pieter Martin Lugt
Archive | 2004
Pieter Martin Lugt; John Howard Tripp
Archive | 2001
Pieter Martin Lugt; John Howard Tripp; Rinke Vos; Ralph Cornelis Petrus Meeuwenoord; Armin Olschewski; Antonio Gabelli; John Michael Beswick; Arend Pieter Voskamp; Aidan Michael Kerrigan; Alexander Jan Carel De Vries; Johannes Cornelis Kuijpers; Eustathios Ioannides
STLE/ASME International Joint Tribology Conference | 2001
Marc Arthur Masen; Cornelis H. Venner; Pieter Martin Lugt; John Howard Tripp
Archive | 2001
Pieter Martin Lugt; Eusthatios Ioannides; Ingrid Victoria Wikström; John Howard Tripp; Marie-Laure Dumont; Antonio Gabelli; B.C. Jacod