Network of Smart Tip-Timing Sensors in Distributed Blade Health Monitoring System

Rokicki, Edward; Kotkowski, Jerzy; Przysowa, Radosław; Filipkowski, P

doi:10.20944/preprints202107.0026.v1

Cited by 2 publications

(4 citation statements)

References 19 publications

(20 reference statements)

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“…Moreover, active cooling can significantly extend the scope of their application. The flexibility of using this type of sensor in the engine and its signal-to-noise ratio was considerably enhanced by introducing a smart conditioning unit [34], able to monitor and control the output signal level.…”

Section: Discussionmentioning

confidence: 99%

“…Like an electric generator, it uses electromagnetic induction to produce output signal as blades pass. The sensor consists of a probe and a specialized conditioning system [33], which can work near the turbine at a temperature as high as 150°C if it is made from high temperature electronic components [34]. The design of the probe and conditioning system must be adapted to the blade material, operating temperature, and the length of the signal cable.…”

Section: Working Principlementioning

confidence: 99%

“…The maximum possible length (typically 12 m) depends on the application: the greater the gain, the shorter the cable should be. The operation of the sensor requires a microprocessor-controlled conditioning system [34], which amplifies the signal and generates a digital TTL signal.…”

Section: Sensor Designmentioning

confidence: 99%

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High Temperature Magnetic Sensors for the Hot Section of Aeroengines

et al. 2021

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Magnetic sensors are widely used in aeroengines and their health management systems, but they are rarely installed in the engine hot section due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of blades operated at elevated temperatures (200–1000 °C) in high pressure compressors and turbines. The interaction of blades with the sensor was studied. A prototype of the sensor was made, and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100 °C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. Moreover, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring (BHM) of the last stages of compressors and gas turbines operating below 1000 °C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability. The presented technology extends the operating temperature of permanent magnets and is not specific for blade vibration but can be adapted to other magnetic measurements in the hot section of the aircraft engine.

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Section: Discussionmentioning

confidence: 99%

Section: Working Principlementioning

confidence: 99%

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High Temperature Magnetic Sensors for the Hot Section of Aeroengines

et al. 2021

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“…Like an electric generator, it uses electromagnetic induction to produce output signal as blades pass. The sensor consists of a probe and a specialized conditioning system, which can work near the turbine at a temperature as high as 150°C if it is made from high temperature electronic components [31]. The design of the probe and conditioning system must be adapted to the blade material, operating temperature and the length of the signal cable.…”

Section: Working Principlementioning

confidence: 99%

High Temperature Magnetic Sensors

Rokicki¹,

Przysowa²,

Kotkowski³

et al. 2021

Preprint

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Magnetic sensors are widely used in health management systems for turbomachinery, but their applications in the hot zone are limited due to the loss of magnetic properties by permanent magnets with increasing temperature. The paper presents and verifies models and design solutions aimed at improving the performance of an inductive sensor for measuring the motion of rotating objects operating at elevated temperatures (200-1000C), such as compressor and turbine blades. Physical, analog and mathematical models of the interaction of blades with the sensor were developed. A prototype of the sensor was made and its tests were carried out on the RK-4 rotor rig for the speed of 7000 rpm, in which the temperature of the sensor head was gradually increased to 1100C. The sensor signal level was compared to that of an identical sensor operating at room temperature. The heated sensor works continuously producing the output signal whose level does not change significantly. What is more, a set of six probes passed an initial engine test in an SO-3 turbojet. It was confirmed that the proposed design of the inductive sensor is suitable for blade health monitoring of the last stages of compressors, steam turbines as well as previous generation gas turbines operating below 1000C, even without a dedicated cooling system. In real-engine applications, sensor performance will depend on how the sensor is installed and the available heat dissipation capability

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Network of Smart Tip-Timing Sensors in Distributed Blade Health Monitoring System

Cited by 2 publications

References 19 publications

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

High Temperature Magnetic Sensors

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