Measuring Surface Temperatures between Rolling Steel Cylinders Using Double-Layer Transducers

Abstract

The signals of the thin-jilm transducers previously used .for the measurement of temperature distributions in elastohydrodynamic contacts have been influenced by the high pressures occurring. At pure rolling conditions when the temperature increase is small, the error caused by pressure reaches nearly the order of magnitude of the temperature signal to be recorded. Using double-layer transducers of a novel type, a reduction of this error of over 90 per cent can be achieved. In this paper temperature measurements at pure rolling conditions are described. It has been shown that a distinct temperature spike occurs at the constriction at the trailing edge of the elastohydrodynamic contact.

Development of a Thin-Film Sensor for In Situ Measurement of the Temperature Rise in Rolling Contacts with Fluid Film and Mixed Lubrication

“…It was also assumed that the pressure distribution of the slip-free preliminary test corresponds to tests with slip and that shear stress due to friction only has minor influence. A second sensor with a different material and consequently with a deviating pressure and temperature dependency should improve the measurements [ 2 , 3 , 4 , 9 , 10 , 11 , 15 , 17 , 18 , 21 ].…”

“…His film thickness measurements with contact pressure up to 1300 MPa showed accordance with a calculation tool of Oster [ 7 ]. Baumann then compensated pressure measurement errors with a double layered sensor by varying the layer thicknesses of manganin and titanium [ 8 , 9 ]. The following pressure and temperature measurements were carried out in a concentrated elastohydrodynamic lubrication (EHL) contact under fluid friction while using silicon oxide as insulating layer.…”

“…Within his tribological investigations on ceramic steel disks Sperrfechter developed an iterative algorithm for an error compensation of combined pressure and temperature sensors [ 17 ]. This algorithm represented an alternative to double-layer transducers from Baumann and later from Kühl [ 8 , 9 , 15 ] . The lubrication gap height was measured capacitively between a thin-film electrode and a metallized ceramic disk.…”