A Microwave Blade Tip Clearance Sensor for Active Clearance Control Applications

Geisheimer, Jonathan L.; Billington, Scott A.; Burgess, David W.

doi:10.2514/6.2004-3720

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Additionally, the purpose of the unbalance test is to check the capability of the sensors technology not in only crack detection but also in predicting other major malfunctions in the rotor system such as unbalance provision. This further supports the theory which relates to rotor design where as the rotational velocity of any rotating object increases, its level of vibration often passes through a maximum at what is called a critical speed 9 . This is commonly excited by unbalance of the rotating structure.…”

Section: Unbalance Test Resultssupporting

confidence: 58%

“…This behavior offers a hint that a difference in the vibration response for the two structures is present signifying the existence of some type of irregularity. Such observation has been reported in Reference [9][10][11][12][13][14][15] , where a crack in the rotor disk is documented via the presence of distorted trace of the vibration vector distribution and a rise in the phase and amplitude response upon surpassing the 1st critical speed, see Figure 8 for notation and units.…”

Section: Spin Test Resultsmentioning

confidence: 83%

“…The controlled speed applied during the current testing was made with an acceleration-deceleration rate of 60 rpm/second. This insured passing the critical speed of 2,610 rpm and leading to post critical state 9 . Figure 6 shows samples of two mission profiles that were used to test the rotors.…”

Section: 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: Unbalance Test Resultssupporting

confidence: 58%

Section: Spin Test Resultsmentioning

confidence: 83%

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Turbine engine disk rotor health monitoring assessment using spin tests data

et al. 2012

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“…The microwave displacement measurement system used by the authors was originally developed and patented at Georgia Tech in 2001 [2]. It is based on a continuous-wave microwave signal that is generated by the electronics, transmitted by the probe and reflected back from the blade tip to the electronics.…”

Section: Microwave Tip Clearance Sensor Overviewmentioning

confidence: 99%

Novel sensors to enable closed-loop active clearance control in gas turbine engines

Geisheimer

Holst

2014

Micro- And Nanotechnology Sensors, Systems, and Applications VI

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Active clearance control within the turbine section of gas turbine engines presents and opportunity within aerospace and industrial applications to improve operating efficiencies and the life of downstream components. Open loop clearance control is currently employed during the development of all new large core aerospace engines; however, the ability to measure the gap between the blades and the case and close down the clearance further presents as opportunity to gain even greater efficiencies. The turbine area is one of the harshest environments for long term placement of a sensor in addition to the extreme accuracy requirements required to enable closed loop clearance control. This paper gives an overview of the challenges of clearance measurements within the turbine as well as discusses the latest developments of a microwave sensor designed for this application.

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A novel resonator cavity microwave sensor for high-temperature blade tip clearance measurement

Niu,

Li,

et al. 2024

Measurement

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A Microwave Blade Tip Clearance Sensor for Active Clearance Control Applications

Cited by 9 publications

References 2 publications

Turbine engine disk rotor health monitoring assessment using spin tests data

Turbine engine disk rotor health monitoring assessment using spin tests data

Novel sensors to enable closed-loop active clearance control in gas turbine engines

A novel resonator cavity microwave sensor for high-temperature blade tip clearance measurement

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