Inductive sensors for blade tip-timing in gas turbines

Przysowa, Radosław; Rokicki, Edward

doi:10.1515/jok-2015-0064

Cited by 15 publications

(21 citation statements)

References 8 publications

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“…Based on the aforementioned advantages and disadvantages, a conclusion can be drawn out that in low-temperature environment, such as the compressor stages, they have broad application prospects. When it comes to the high-temperature environment, such as the turbine stages, though some researches had been done, 20,21 some works still needs to be carried out.…”

Section: Inductive 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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Section: Inductive 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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“…Recent studies have shown that optical fibre probes are suitable for development testing [40]. However, outside the laboratory, debris and low tolerances make their application difficult [17,38,41].…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

“…Higher temperatures decrease the magnetisation of the permanent magnet and increase the impedance of the winding. They are characterised by long life, high reliability and resistance to contamination [40]. Another advantage is their simple construction.…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

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A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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The need for non-destructive testing/structural health monitoring (SHM) is becoming increasingly important for gas turbine manufacturers. Incipient cracks have to be detected before catastrophic events occur. With respect to condition-based maintenance, the complex and expensive parts should be used as long as their performance or integrity is not compromised. In this study, the main failure modes of turbines are reported. In particular, we focus on the turbine blades, turbine vanes and the transition ducts of the combustion chambers. The existing monitoring techniques for these components, with their own particular advantages and disadvantages, are summarised in this review. In addition to the vibrational approach, tip timing technology is the most used technique for blade monitoring. Several sensor types are appropriate for the extreme conditions in a gas turbine, but besides tip timing, other technologies are also very promising for future NDT/SHM applications. For static parts, like turbine vanes and the transition ducts of the combustion chambers, different monitoring possibilities are identified and discussed.

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“…e contactless inductive sensor designed at Air Force Institute of Technology [26,42] and mounted at the engine chassis has been used to measure blades displacements. Its principle of operation is based on electrodynamical interaction and therefore it may be referred as a passive eddycurrent sensor.…”

Section: Experimental Test Standmentioning

confidence: 99%

Rotor Blades Diagnosis Method Based on Differences in Phase Shifts

Grądzki

Lindstedt

Kulesza

et al. 2018

Shock and Vibration

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In this work, an innovative diagnosis method of rotor blades is presented. A measurement signal of blade tip displacement is divided into two observation zones, in which two peaks of an additional template signal are introduced. Cross-correlation and power spectral density functions of the measurement and template signals in these two distinct zones are calculated. Next, the phase shift between the two cross-correlation functions is obtained by calculating the ratio of the two power spectral density functions. The changes in parameters of an analytical description of this phase shift are used to determine a distinct and easy-to-analyze image of the technical condition of the tested blade. A graphical portrait indicating the technical condition of all blades in the annulus is developed. Although not directly measured, environmental signals (e.g., external disturbances and sensor’s noise) affecting the diagnostic process are included in the method. It is demonstrated that, by using the proposed signal processing technique, a negative influence of these disturbances is eliminated and the reliability of the machine technical condition indications is improved. The approach is demonstrated using experimental results of turbine engine blade displacements. High effectiveness of the method and measurement equipment has been confirmed in a wide range of analyzed tip-timing results obtained in different periods of the measurement process.

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Inductive sensors for blade tip-timing in gas turbines

Cited by 15 publications

References 8 publications

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

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

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Rotor Blades Diagnosis Method Based on Differences in Phase Shifts

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