NTRS - NASA Technical Reports Server

Back to Results
Structural Health Monitoring on Turbine Engines Using Microwave Blade Tip Clearance SensorsThe ability to monitor the structural health of the rotating components, especially in the hot sections of turbine engines, is of major interest to aero community in improving engine safety and reliability. The use of instrumentation for these applications remains very challenging. It requires sensors and techniques that are highly accurate, are able to operate in a high temperature environment, and can detect minute changes and hidden flaws before catastrophic events occur. The National Aeronautics and Space Administration (NASA) has taken a lead role in the investigation of new sensor technologies and techniques for the in situ structural health monitoring of gas turbine engines. As part of this effort, microwave sensor technology has been investigated as a means of making high temperature non-contact blade tip clearance, blade tip timing, and blade vibration measurements for use in gas turbine engines. This paper presents a summary of key results and findings obtained from the evaluation of two different types of microwave sensors that have been investigated for use possible in structural health monitoring applications. The first is a microwave blade tip clearance sensor that has been evaluated on a large scale Axial Vane Fan, a subscale Turbofan, and more recently on sub-scale turbine engine like disks. The second is a novel microwave based blade vibration sensor that was also used in parallel with the microwave blade tip clearance sensors on the experiments with the sub-scale turbine engine disks.
Document ID
Document Type
Conference Paper
Woike, Mark
(NASA Glenn Research Center Cleveland, OH United States)
Abdul-Aziz, Ali
(Cleveland State Univ. Cleveland, OH, United States)
Clem, Michelle
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
July 15, 2014
Publication Date
March 11, 2014
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Meeting Information
SPIE Smart Structures/NDE 2014 Conference(San Diego, CA)
Funding Number(s)
WBS: WBS 284848.
Distribution Limits
Public Use Permitted.
Gas Turbine Engines
Structural Health Monitoring
Blade Tip Clearance
No Preview Available