Development of an Ultrasonic Sensing Technique to Measure Lubricant Viscosity in Engine Journal Bearing In-Situ

  • MicheleĀ Schirru

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Michele Schirru
    Pages 1-6
  3. Michele Schirru
    Pages 7-35
  4. Michele Schirru
    Pages 37-58
  5. Michele Schirru
    Pages 59-76
  6. Michele Schirru
    Pages 101-133
  7. Michele Schirru
    Pages 135-162
  8. Michele Schirru
    Pages 163-167

About this book


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. 


Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Engineering Acoustics Automotive Engineering

Authors and affiliations

  • MicheleĀ Schirru
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of Sheffield SheffieldUnited Kingdom

Bibliographic information

  • DOI
  • Copyright Information Springer International Publishing AG 2017
  • Publisher Name Springer, Cham
  • eBook Packages Engineering Engineering (R0)
  • Print ISBN 978-3-319-53407-7
  • Online ISBN 978-3-319-53408-4
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
  • Buy this book on publisher's site
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