A New Approach to Validading Sliding Bearing Concepts 2019-01-0733
As emission standards become stricter, the potential to increase the efficiency of drive/propulsion engines by combustion concept development alone is reduced. As a consequence, there is growing interest in tribological analysis, which offers the potential for an even greater reduction in fuel consumption.
This paper deals with new concepts for measuring physical quantities that are characteristic of sliding bearings, one of which is the measurement of moving components using a wireless transmission system. The concept for the telemetry system includes a demarcation of performance, the measurements made possible by it and a description of its use for commercial purposes.
The measurements were carried out in different test environments along with sliding bearing test rig and tests on a heavy-duty engine from MAN SE set up on a multicylinder engine test bed at LEC GmbH.
Thermocouple measurements in the high stress zone included individual temperature measurements as well as measurements at several measuring points to determine the temperature distribution. Measurements of the temperature on the back of the bearings serve to verify the measurement results and allow a comparison to be made with the state-of-the-art technology. These measurements also provide reference values so that new measurement methods that use specially developed thin film sensors in the bearing setup can be evaluated. This paper provides insight into the manufacture and implementation of these sensors as well as an interpretation of the initial measurement results.
Conclusions are drawn about whether the research results from bearing tests on the bearing test bed are transferable to real operation in a production engine. In addition, the bearing temperatures with different lubricant viscosities are compared. The effects of oil viscosity are demonstrated on the current Euro 6c engine.
The findings from this research serve as the basis for model development as well as the boundary conditions for ElastoHydroDynamic simulation.