Infrared emission spectra of elastohydrodynamic contactsA small diamond disk mounted as a window in a steel plate was covered with test fluid, and a weighted steel ball was rotated over the window so as to form a sliding elastohydrodynamic (EHD) contact region. Some of the radiant energy generated in this region, both in the fluid and at the boundaries, passed through the window into an infrared interferometer, giving rise to an emission spectrum. This spectrum could be separated into contributions from the fluid and from the ball surface, making it possible, by appropriate calibrations, to estimate their temperatures separately under operating conditions. Moreover, the shape of the discrete spectral bands of the fluid permitted some inferences on its state. Two fluids were studied under identical mechanical conditions, a polyester and a naphthenic oil, each containing an equal amount of polymethylstyrene as a spectral indicator. Differences of band intensity, band width, and frequency could, therefore, be attributed to differences in the behavior of the base fluid.
Document ID
19760031897
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lauer, J. L. (Sun Oil Co. Marcus Hook, PA, United States)
Peterkin, M. E. (Sun Oil Co. Marcus Hook, Pa., United States)
Date Acquired
August 8, 2013
Publication Date
October 1, 1975
Subject Category
Mechanical Engineering
Report/Patent Number
ASME PAPER 75-LUB-10
Meeting Information
Meeting: Joint Lubrication Conference
Location: Miami Beach, FL
Start Date: October 21, 1975
End Date: October 23, 1975
Sponsors: American Society of Mechanical Engineers and American Society of Lubrication Engineers