The Measurement of Liner - Piston Skirt Oil Film Thickness by an Ultrasonic Means
The Measurement of Liner - Piston Skirt Oil Film Thickness by an Ultrasonic Means
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超声波测量缸套-活塞裙油膜厚度
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Howell
中科院分区：
文献类型：
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作者：
R. Dwyer;D. Green;P. Harper;R. Lewis;S. Balakrishnan;P. King;H. Rahnejat;S. Howell
本文提出了一种新的方法
The 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.