Development of an Optical-Electromagnetic Model of a Microwave Blade Tip Sensor

Holst, Thomas; Billington, Scott A.; Geisheimer, Jonathan L.

doi:10.2514/6.2005-4377

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…However, the manifestation of such observations remains not as straightforward but it underlines or it confirms the presence of some type of defect. Still, further work to confirm this scrutiny is needed 7 .…”

Section: Spin Test Resultsmentioning

confidence: 99%

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Turbine engine disk rotor health monitoring assessment using spin tests data

et al. 2012

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Detecting rotating engine component malfunctions and structural anomalies is increasingly becoming a crucial key feature that will help boost safety and lower maintenance cost. However, achievement of such technology, which can be referred to as a health monitoring remains somewhat challenging to implement. This is mostly due to presence of scattered loading conditions, crack sizes, component geometry and material properties that hinders the simplicity of imposing such application. Different approaches are being considered to assist in developing other means of health monitoring or nondestructive techniques to detect hidden flaws and mini cracks before any catastrophic events occur. These methods extend further to assess material discontinuities and other defects that have matured to the level where a failure is very likely. This paper is focused on presenting data obtained from spin test experiments of a turbine engine like rotor disk and their correlation to the development of a structural health monitoring and fault detection system. The data collected includes blade tip clearance, blade tip timing measurements and shaft displacements. The experimental results are collected at rotational speeds up to 10,000 Rpm and tests are conducted at the NASA Glenn Research Center's Rotordynamics Laboratory via a high precision spin system. Additionally, this study offers a closer glance at a selective online evaluation of a rotating disk using advanced capacitive, microwave and eddy current sensor technology.

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Section: Spin Test Resultsmentioning

confidence: 99%

“…The tip clearance probe is both a transmitting and receiving antenna [4][5][6][7][8] . The sensor emits a continuous microwave signal and measures the signal that is reflected off a passing blade.…”

Section: Micrwowave Sensor Background and Theorymentioning

confidence: 99%

Turbine engine disk rotor health monitoring assessment using spin tests data

et al. 2012

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“…50,51 In 2013, an optical-electromagnetic model based on microwave blade tip sensor was developed; this model could make precise phase measurement for relatively small blades, and it could calculate and analyze remotely without practical tests that are expensive and time-consuming, which greatly saved time and labor. 52 A new 24-GHz microwave sensor system for real-time tip-clearance monitoring of small-size turbines was developed by researchers; the system was verified by software simulations and prototype experiments. 53 The measurement results were similar to the simulation results, and the system was finally used in an actual engine.…”

Section: Blade Tip-clearance Measurement Methodsmentioning

confidence: 99%

A review of blade tip clearance–measuring technologies for gas turbine engines

Shen

et al. 2020

Measurement and Control

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Blade tip clearance is one of the important parameters affecting the performance, safety and stability of a gas turbine engine. However, it is difficult to measure the tip clearance in real time and accurately during the development and test process of an engine. In order to promote the development of tip clearance–measuring technology and the optimal design of the gas turbine engine, some typical measuring methods of tip clearance and a novel measuring method based on AC discharge are introduced. In this article, the significance for measuring tip clearance of an engine is illustrated first. Then, operating principles, characteristics and developments of those typical measurement approaches are introduced. After that, these methods are analyzed, and the particular characteristic of each measuring approach is summarized.

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“…The time interval of when the blade passes through the field is measured to provide blade tip timing. More detailed information on the sensor's theory of operation can be found in [4–6]. The microwave blade tip clearance probes are made of high temperature material and are designed to operate in temperatures up to 900°C.…”

Section: Microwave Blade Tip Clearance/blade Tip Timing Sensorsmentioning

confidence: 99%

New Sensors and Techniques for the Structural Health Monitoring of Propulsion Systems

Woike

Abdul-Aziz

Oza

et al. 2013

The Scientific World Journal

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The 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), through the Aviation Safety Program (AVSP), has taken a lead role in the development of new sensor technologies and techniques for the in situ structural health monitoring of gas turbine engines. This paper presents a summary of key results and findings obtained from three different structural health monitoring approaches that have been investigated. This includes evaluating the performance of a novel microwave blade tip clearance sensor; a vibration based crack detection technique using an externally mounted capacitive blade tip clearance sensor; and lastly the results of using data driven anomaly detection algorithms for detecting cracks in a rotating disk.

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Development of an Optical-Electromagnetic Model of a Microwave Blade Tip Sensor

Cited by 7 publications

References 1 publication

Turbine engine disk rotor health monitoring assessment using spin tests data

Turbine engine disk rotor health monitoring assessment using spin tests data

A review of blade tip clearance–measuring technologies for gas turbine engines

New Sensors and Techniques for the Structural Health Monitoring of Propulsion Systems

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