Eddy Current Sensor System for Blade Tip Clearance Measurement Based on a Speed Adjustment Model

Wu, Jiang; Wen, Bangchun; Zhou, Yu; Zhang, Qi; Ding, Shuiting; Du, Feng; Zhang, Shuguang

doi:10.3390/s19040761

Cited by 19 publications

(8 citation statements)

References 37 publications

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“…e blade continuously cuts the magnetic induction lines through rotation and radial displacement in this alternating magnetic field and generates the induced current. is induced current generates an alternating magnetic field in the opposite direction of the original magnetic field and counteracts part of the original field [20]. It leads to the change in the equivalent impedance Z of the coil.…”

Section: Measurement Principle Of Eddy Currentmentioning

confidence: 99%

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

Zhang

Wang

2021

Shock and Vibration

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Blade tip timing (BTT) technology is the most effective means for real-time monitoring of blade vibration. Accurately extracting the time of blade tip reaching the sensors is the key to ensure the accuracy of the BTT system. The tip clearance changes due to various complex forces during high-speed rotation. The traditional BTT signal extraction method does not consider the influence of tip clearance change on timing accuracy and introduces large timing errors. To solve this problem, a quadratic curve fitting timing method was proposed. In addition, based on the measurement principle of the eddy current sensors, the relationship among the output voltage of the eddy current sensor, tip clearance, and the blade cutting magnetic line angle was calibrated. A multisensor vibration parameter identification algorithm based on arbitrary angular distribution was introduced. Finally, the experiments were conducted to prove the effectiveness of the proposed method. The results show that in the range of 0.4 to 1.05 mm tip clearance change, the maximum absolute error of the timing values calculated by the proposed method is 26.0359 us, which is much lower than the calculated error of 203.7459 us when using the traditional timing method. When the tip clearance changed, the constant speed synchronous vibration parameters of No. 0 blade were identified. The average value of the vibration amplitude is 1.0881 mm. Compared with the identification results without changing tip clearance, the average value error of the vibration amplitude is 0.0017 mm. It is proved that within the blade tip clearance variation of 0.4 to 0.9 mm, the timing values obtained by the proposed timing method can accurately identify the vibration parameters of the blade.

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Section: Measurement Principle Of Eddy Currentmentioning

confidence: 99%

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

Zhang

Wang

2021

Shock and Vibration

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“…[ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. The ECP for aerospace applications [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ] is of particular interest among such sensors. These ECPs are usually developed to operate under harsh and even extreme conditions primarily associated with high temperatures in the measuring area reaching +1000 °C or more in the turbines of modern gas turbine engines (GTE).…”

Section: Introductionmentioning

confidence: 99%

Reducing the Impact of Influence Factors on the Measurement Results from Single-Coil Eddy Current Sensors

Borovik

Kuteynikova

Sekisov

2022

Sensors

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Single-coil eddy current sensors (SCECS) form a separate and independent branch among the existing eddy current probes. Such sensors are often used for aviation and aerospace applications where the conditions accompanying the measuring process are harsh and even extreme. High temperatures (up to +600 °C in the compressor and over +1000 °C in the turbine of gas turbine engines), the complex shape surfaces of the monitored parts, the multidimensional movement of the power plants’ structural elements, restrictions on the probes number and their placement in the measuring zone are the main factors affecting the reliability and accuracy of the measurement results obtained by the sensors. The article provides an overview of the relevant approaches and methods for reducing the impact of influence factors on the measurement results from SCECS based on the extensive experience of more than 30 years of research and development being carried out in the Institute for the Control of Complex Systems of Russian Academy of Sciences. The scope of the solutions discussed in the article is not limited to SCECS measurement systems only but can also be extended to the systems with primary transducers of other designs or other physical principles.

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“…Permanent magnet inductive sensors known as passive eddy current sensors [17,18] do not have a high-frequency generator and detector. There is, thus, higher bandwidth and no problem with cross-talk and the carrier frequency related to the operation of the generator in active eddy-current sensors [19,20]. The disadvantage of passive sensors is the dependence of the signal on the speed, but this is much less relevant in BTT, especially in constant-speed power generation machines.…”

Section: Introductionmentioning

confidence: 99%

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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Eddy Current Sensor System for Blade Tip Clearance Measurement Based on a Speed Adjustment Model

Cited by 19 publications

References 37 publications

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

Reducing the Impact of Influence Factors on the Measurement Results from Single-Coil Eddy Current Sensors

High Temperature Magnetic Sensors for the Hot Section of Aeroengines

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