Engine oil condition monitoring using high temperature integrated ultrasonic transducers

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TypeArticle
Journal titleInternational Journal of Prognostics and Health Management
Volume2
Issue2
Article number010
Physical description7 p.
SubjectEngine oil; Condition monitoring; Ultrasound; High temperature; Integrated ultrasonic transducer
AbstractThe present work contains two parts. In the first part, high temperature integrated ultrasonic transducers (IUTs) made of thick piezoelectric composite films, were coated directly onto lubricant oil supply and sump lines of a modified CF700 turbojet engine. These piezoelectric films were fabricated using a sol-gel spray technology. By operating these IUTs in transmission mode, the amplitude and velocity of transmitted ultrasonic waves across the flow channel of the lubricant oil in supply and sump lines were measured during engine operation. Results have shown that the amplitude of the ultrasonic waves is sensitive to the presence of air bubbles in the oil and that the ultrasound velocity is linearly dependent on oil temperature. In the second part of the work, the sensitivity of ultrasound to engine lubricant oil degradation was investigated by using an ultrasonically equipped and thermally-controlled laboratory testing cell and lubricant oils of different grades. The results have shown that at a given temperature, ultrasound velocity decreases with a decrease in oil viscosity. Based on the results obtained in both parts of the study, ultrasound velocity measurement is proposed for monitoring oil degradation and transient oil temperature variation, whereas ultrasound amplitude measurement is proposed for monitoring air bubble content.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Industrial Materials Institute; NRC Institute for Aerospace Research
Peer reviewedYes
NRC number54263
NPARC number18984875
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Record identifier055d2c7f-478e-4ec8-a2d1-4d423d5c044c
Record created2011-11-26
Record modified2016-05-09
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