Novel Microwave Vibration Monitoring System for Industrial Power Generating Turbines

Wagner, Marcel; Schulze, Andreas; Vossiek, Martin; Stephelbauer, C.; Weigel, Robert; Vortmeyer, N.; Heide, P.

doi:10.1109/arftg.1998.327293

Cited by 7 publications

(4 citation statements)

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“…The first application of this method on a 65-MW gas turbine was reported in 1998. 49 Further researches ware made in the following years, researchers designed a microwave tip-clearance measurement system that could operate at a high temperature of 1900 K, and the measurement accuracy of the system reached 0.05 mm. The experimental results confirmed the possibility of the microwave system to be simultaneously applied to measure the tip clearance, rotor axial displacement and blades extension.…”

Section: Microwave 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: Microwave 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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“…The first application in a gas turbine was reported by Wagner et al in 1998. For pilot tests a 65 MW gas turbine were used [34]. Zhang et al proved experimentally the general feasibility of blade tip timing with microwave sensors [29].…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

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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“…Finally, examples of applications can be found also with microwave probes (Wagner et. al [12]) and pressure sensors (Belsterling [13]). This paper describes a novel sensor for blade vibration and clearance measurements in turbomachines, based on magnetoresistive sensing elements.…”

Section: Introductionmentioning

confidence: 99%

On the development of a magnetoresistive sensor for blade tip timing and blade tip clearance measurement systems

Tomassini

Rossi

Brouckaert

2014

AIP Conference Proceedings

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The accurate control of the gap between static and rotating components is vital to preserve the mechanical integrity and ensure a correct functioning of any rotating machinery. Moreover, tip leakage above the airfoil tip results in relevant aerodynamic losses. One way to measure and to monitor blade tip gaps is by the so-called Blade Tip Clearance (BTC) technique. Another fundamental phenomenon to control in the turbomachines is the vibration of the blades. For more than half a century, this has been performed by installing strain gauges on the blades and using telemetry to transmit the signals. The Blade Tip Timing (BTT) technique, (i.e. measuring the blade time of arrival from the casing at different angular locations with proximity sensors) is currently being adopted by all manufacturers as a replacement for the classical strain gauge technique because of its non-intrusive character.This paper presents a novel magnetoresistive sensor for blade tip timing and blade tip clearance systems, which offers high temporal and high spatial resolution simultaneously. The sensing element adopted is a Wheatstone bridge of Permalloy elements. The principle of the sensor is based on the variation of magnetic field at the passage of ferromagnetic objects. Two different configurations have been realized, a digital and an analogue sensor. Measurements of tip clearance have been performed in an high speed compressor and the calibration curve is reported. Measurements of blade vibration have been carried out in a dedicated calibration bench; results are presented and discussed.The magnetoresistive sensor is characterized by high repeatability, low manufacturing costs and measurement accuracy in line with the main probes used in turbomachinery testing. The novel sensor has great potential and is capable of fulfilling the requirements for a simultaneous BTC and BTT measurement system.

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Novel Microwave Vibration Monitoring System for Industrial Power Generating Turbines

Cited by 7 publications

References 0 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

On the development of a magnetoresistive sensor for blade tip timing and blade tip clearance measurement systems

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