Contactless Diagnostics of Turbine Blade Vibration and Damage

Procházka, Pavel; Vaněk, František

doi:10.1088/1742-6596/305/1/012116

Cited by 24 publications

(18 citation statements)

References 4 publications

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“…The time differences of the blade impulses are measured in a precise counter of the system with the resolution of 10 ns. Parameters of blade vibrations and other dynamic and static characteristics are evaluated from these time differences [8], [9].…”

Section: Magnetoresistive Sensorsmentioning

confidence: 99%

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New Methods of Noncontact Sensing of Blade Vibrations and Deflections in Turbomachinery

Procházka

Vaněk

2014

IEEE Trans. Instrum. Meas.

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This paper is focused on new methods of noncontact sensing vibrations and deflections of rotating machine parts, especially blades of steam turbines. Special attention is paid to the induction and magnetoresistive (MR) sensors developed in the Institute of Thermomechanics for noncontact measurements of characteristics of rotating blades inside steam turbines under operation. Different principles of noncontact sensors based on measuring deflections or velocity components are described and compared, including new types of MR sensors. Hitherto unpublished principles of sensors intended for shrouded blades are described and discussed.

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Section: Magnetoresistive Sensorsmentioning

confidence: 99%

“…Torsional vibrations of a blade can be calculated as the dynamic component of (14). The necessary equations were published in [8].…”

Section: Novel Sensors For Shrouded Bladesmentioning

confidence: 99%

New Methods of Noncontact Sensing of Blade Vibrations and Deflections in Turbomachinery

Procházka

Vaněk

2014

IEEE Trans. Instrum. Meas.

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show abstract

Section: Magnetoresistive Sensorsmentioning

confidence: 99%

“…Torsional vibrations of a blade can be calculated as the dynamic component of (14). The necessary equations were published in [10].…”

Section: Novel Sensors For Shrouded Bladesmentioning

confidence: 99%

New methods of non-contact sensing of blade vibrations and deflections in turbomachinery

Procházka

Vaněk

2013

2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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The paper is focused on new methods of non-contact sensing vibrations and deflections of rotating machine parts, especially blades of steam turbines. Special attention is paid to the induction and magnetoresistive sensors developed in the Institute of Thermomechanics for non-contact measurements of characteristics of rotating blades inside steam turbines under operation. Different principles of non-contact sensors based on measuring deflections or velocity components are described and compared, including new types of magnetoresistive sensors. Hitherto unpublished principles of sensors intended for shrouded blades are described and discussed.

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“…This paper describes a novel sensor for blade vibration and clearance measurements in turbomachines, based on magnetoresistive sensing elements. The same technology has been tested also by Prochazka [14] in a steam turbine. This paper reports the developments and the performance achieved so far.…”

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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Contactless Diagnostics of Turbine Blade Vibration and Damage

Cited by 24 publications

References 4 publications

New Methods of Noncontact Sensing of Blade Vibrations and Deflections in Turbomachinery

New Methods of Noncontact Sensing of Blade Vibrations and Deflections in Turbomachinery

New methods of non-contact sensing of blade vibrations and deflections in turbomachinery

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

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