Dwyer-Joyce.pdf (316.25 kB)
The measurement of liner - piston skirt oil film thickness by an ultrasonic means
journal contribution
posted on 2011-09-06, 08:59 authored by R.S. Dwyer-Joyce, D.A. Green, Sashi Balakrishnan, P. Harper, R. Lewis, S.J. Howell-Smith, Paul KingPaul King, Homer RahnejatThe paper presents a novel method for the
measurement of lubricant film thickness in the
piston-liner contact. Direct measurement of the film
in this conjunction has always posed a problem,
particularly under fired conditions. The principle is
based on capturing and analysing the reflection of
an ultrasonic pulse at the oil film. The proportion of
the wave amplitude reflected can be related to the
thickness of the oil film. A single cylinder 4-stroke
engine on a dyno test platform was used for
evaluation of the method. A piezo-electric
transducer was bonded to the outside of the
cylinder liner and used to emit high frequency short
duration ultrasonic pulses. These pulses were used
to determine the oil film thickness as the piston
skirt passed over the sensor location. Oil films in the
range 2 to 21 μm were recorded varying with
engine speeds. The results have been shown to be
in agreement with detailed numerical predictions.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
DWYER-JOYCE, R.S.....et al., 2006. The measurement of liner - piston skirt oil film thickness by an ultrasonic means. SAE Technical Paper 2006-01-0648Publisher
© 2006 SAE InternationalVersion
- AM (Accepted Manuscript)
Publication date
2006Notes
Copyright © 2006 SAE International. This paper is posted on this site with permission from SAE International, and is for viewing only. Further distribution and use of this paper is not permitted without permission from SAE. This paper was part of 2006 World Congress, Detroit, Michigan, April 3-6, 2006Publisher version
Language
- en