Engine Oil Condition Monitoring Using High Temperature Integrated Ultrasonic Transducers

Kuo-Ting Wu, Makiko Kobayashi, Zhigang Sun, Cheng-Kuei Jen, Pierre Sammut, Jeff Bird, Brian Galeote, and Nezih Mrad
Publication Target: 
IJPHM
Publication Issue: 
2
Submission Type: 
Full Paper
AttachmentSizeTimestamp
ijPHM_11_010.pdf2.37 MBNovember 23, 2011 - 7:44am

The 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 Year: 
2011
Publication Volume: 
2
Publication Control Number: 
010
Page Count: 
7
Submission Keywords: 
Engine oil
condition monitoring
ultrasound
high temperature
integrated ultrasonic transducer
Submission Topic Areas: 
Sensors
Submitted by: 
  
 
 
 

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