CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
research
Auto-calibration of ultrasonic lubricant-film thickness measurements
Authors
Astridge D G
B W Drinkwater
+8 more
El-Sisi S I
Haines N F
J Zhang
R S Dwyer-Joyce
Richardson D A Borman G L
T Reddyhoff
Tattersall H G
Zhang J
Publication date
1 January 2007
Publisher
'IOP Publishing'
Doi
Cite
Abstract
The measurement of oil film thickness in a lubricated component is essential information for performance monitoring and design. It is well established that such measurements can be made ultrasonically if the lubricant film is modelled as a collection of small springs. The ultrasonic method requires that component faces are separated and a reference reflection recorded in order to obtain a reflection coefficient value from which film thickness is calculated. The novel and practically useful approach put forward in this paper and validated experimentally allows reflection coefficient measurement without the requirement for a reference. This involves simultaneously measuring the amplitude and phase of an ultrasonic pulse reflected from a layer. Provided that the acoustic properties of the substrate are known, the theoretical relationship between the two can be fitted to the data in order to yield reflection coefficient amplitude and phase for an infinitely thick layer. This is equivalent to measuring a reference signal directly, but importantly does not require the materials to be separated. The further valuable aspect of this approach, which is demonstrated experimentally, is its ability to be used as a self-calibrating routine, inherently compensating for temperature effects. This is due to the relationship between the amplitude and phase being unaffected by changes in temperature which cause unwanted changes to the incident pulse. Finally, error analysis is performed showing how the accuracy of the results can be optimized. A finding of particular significance is the strong dependence of the accuracy of the technique on the amplitude of reflection coefficient input data used. This places some limitations on the applicability of the technique. © 2008 IOP Publishing Ltd
Similar works
Full text
Open in the Core reader
Download PDF
Available Versions
White Rose Research Online
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:eprints.whiterose.ac.uk:91...
Last time updated on 28/06/2012
Supporting member
Explore Bristol Research
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:research-information.bris....
Last time updated on 10/08/2019
Crossref
See this paper in CORE
Go to the repository landing page
Download from data provider
Last time updated on 03/01/2020