Research on the Tip Clearance Measuring Method Based on AC Discharge

Yu, Bing; Zhang, Tao; Ke, Hongwei; Zhang, Tianhong

doi:10.1109/access.2020.2980324

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…Existing BTC monitoring methods mainly include five kinds of methods: the discharge probe method [6,7], the optical fiber method [8][9][10][11][12], the capacitance method [13][14][15][16][17], the eddy current method [18][19][20][21] and the microwave method [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Synchronous Vibration Parameter Recognition of Constant-Speed Blades Based on Blade Tip Clearance Measurement

Zhang,

Xia,

Chen

et al. 2023

Applied Sciences

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A new method for the synchronous vibration parameter identification of constant-speed rotating blades based on blade tip clearance (BTC) measurement and blade tip timing (BTT) is introduced. A BTC sensor is used to measure the BTC when the blade tip passes through each sensor. The BTT method is used to determine whether the blade tip arrives in advance or lags. The geometric model between the BTC and the blade tip vibration displacement (BTVD) is established, and the BTVD of the blade tip passing through each sensor is obtained. Then, the nonlinear least squares method is used to determine the synchronous vibration parameters of the constant-speed rotating blade. The results show that with an increase in amplitude, the higher the accuracy of the vibration parameter identification proposed in this paper; with a decrease in the random error of the BTC measurement, the higher the accuracy of the vibration parameter identification proposed in this paper; with a decrease in the random error in the measurement of the blade disk dimensions, the higher the accuracy of the vibration parameter identification proposed in this paper. In addition, the smaller the ratio of the blade length to the blade disk radius, the higher the accuracy of the vibration parameter identification method introduced in this paper. Because the structure of the gas turbine compressor and turbine blade disk has a small blade disk ratio, the method proposed in this paper is suitable for the simultaneous vibration parameter identification of gas turbine compressor blades and turbine blades.

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Section: Introductionmentioning

confidence: 99%

Synchronous Vibration Parameter Recognition of Constant-Speed Blades Based on Blade Tip Clearance Measurement

Zhang,

Xia,

Chen

et al. 2023

Applied Sciences

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“…Blade tip clearance (BTC) measurement plays an important role in monitoring the condition and optimizing the performance of turbomachinery. BTC is defined as the radial distance between the rotor blade and casing, which has a great correlation with the efficiency and safety of turbomachinery [1][2][3][4]. Numerous studies have shown that too large a BTC will cause flow leakage and engine efficiency loss, whereas too small a BTC has the risk of friction collision between the rotor blade and casing because of blade load change, casing deformation and thermal expansion [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A novel self-adaptive, multi-peak detection algorithm for blade tip clearance measurement based on a capacitive probe

Guo²,

Duan

et al. 2021

Meas. Sci. Technol.

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Peak height detection is critical for blade tip clearance (BTC) measurement based on capacitive probes. However, the noise interference of the complicated working environments and instabilities of the rotation speed make high-precision peak detection a challenge. To solve this problem, a novel self-adaptive, multi-peak detection algorithm is proposed in this paper. The adaptive dual thresholds are used to identify the single peak and pre-estimate its peak parameters for the segmentation of the peak support region and the selection basis of the wavelet parameters. Then, based on the prior pre-estimation information, the wavelet matching is performed on the segmented single peak adaptively for eight times, and the derived mathematical models of the wavelet matching are fitted using the obtained matching coefficients to get precise peak parameters such as peak height and peak position. The blade tip clearance is calculated from the peak height through the calibration curve. The experiments show that the BTC measurement error of the proposed algorithm is under 15 μm, with the clearance ranging from 1 mm to 3 mm , and the proposed algorithm has preferable stability to comparable algorithms with the rotation speed ranging from 1000 rpm to 4000 rpm. This implies that the proposed algorithm has high anti-noise performance and good adaptability to rotation speed change.

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A novel rotor dynamic balancing method based on blade tip clearance measurement without the once per revolution sensor

LI,

WANG,

ZHANG

et al. 2024

Chinese Journal of Aeronautics

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Research on the Tip Clearance Measuring Method Based on AC Discharge

Cited by 9 publications

References 26 publications

Synchronous Vibration Parameter Recognition of Constant-Speed Blades Based on Blade Tip Clearance Measurement

Synchronous Vibration Parameter Recognition of Constant-Speed Blades Based on Blade Tip Clearance Measurement

A novel self-adaptive, multi-peak detection algorithm for blade tip clearance measurement based on a capacitive probe

A novel rotor dynamic balancing method based on blade tip clearance measurement without the once per revolution sensor

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