This thesis presents a novel ultrasonic instrument for non-invasive
and in-situ characterization of journal bearing lubricant
viscosity. In particular, the application to journal bearings is
described by non-invasively measuring the viscosity and localized
power losses throughout operation. This ultrasonic viscometer is
based on the reflection of polarized shear waves from a thin
resonating coating layer to increase the measurement sensitivity,
in comparison to conventional ultrasonic methods. This instrument
allows for a full engine oil viscoelastic characterization in-situ.
The book investigates the effects of temperature, pressure and
shear rate, and describes in detail the ultrasonic setup and
method. Further, it demonstrates that the same technique can be
applied similarly to monitor the lubrication of other engine
components. As such, it offers a unique instrument that can drive
the research of oil formulations to improve engine performance and
fulfill the requirements of international fuel economy regulations.
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