基于RD-S校正的叶端整剖面间隙微波测量方法

doi:10.7527/S1000-6893.2025.31607

Abstract

Abstract:

The non-contact， high-precision measurement of complex blade tip profile clearance is critical for ensuring the safe and efficient operation of aero-engines. In a 120 GHz microwave sensor-based static and dynamic measurement system， the static echo signal is affected by amplitude modulation interference， while the tip information reflected by the dynamic echo signal from complex-shaped blades is susceptible to abrupt boundary phase changes. These challenges significantly hinder accurate static and dynamic measurements of blade tip profile clearance. To address these issues， this paper first introduces the Ratio Differentiation-Spectrum （RD-S） correction method to estimate imbalance parameters under amplitude modulation. This method leverages the attenuation consistency of I/Q signals to eliminate amplitude modulation interference in static echo signals via ratio differentiation， and subsequently estimates imbalance parameters using the main and mirror frequency components. Secondly， by employing the Deimoffer theorem and integrating amplitude-phase information， the method mitigates boundary phase mutation effects and enables the measurement of tip profile clearance across any half-wavelength. The experimental results demonstrate that the proposed RD-S correction method in static measurements reduces the demodulation displacement error by an average of 79.2% in comparison with the conventional correction method， achieving an average displacement error of 1.31 μm and a nonlinearity of less than 0.06%. In dynamic measurements， the method achieves an average blade tip clearance error of less than 2.5 μm within a relative tip variation range of 300 μm. Additionally， the average measurement error for the concave depth of H-shaped blades is 2.09 μm.

Key words: blade tip clearance, microwave measurements, RD-S correction, blade tip profile clearance, phase difference, spectral correction

CLC Number:

V249.1

Wei FAN, Saisai CHEN, Yuyong XIONG, Jinzhong LU, Zhike PENG. Microwave measurement method for blade tip profile clearance through RD-S correction[J]. Acta Aeronautica et Astronautica Sinica, 2025, 46(16): 231607.

Figures/Tables 30

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References 23

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信噪比/dB	方法	幅值误差	相位误差/rad	位移RMSE/μm
50	EC^［12］	5.17×10^-1	1.92×10^-1	31.342
	GSOP^［13］	2.78×10^-3	3.29×10^-2	2.378 4
	频谱校正^［14］	2.98×10^-3	2.82×10^-2	2.047 2
	S-EKD^［20］	8.35×10^-3	-1.19×10^-2	1.006 9
	RD-S	1.96×10^-4	-8.31×10^-5	0.066 1
100	EC^［12］	1.41	4.06×10^-1	67.083
	GSOP^［13］	-2.03×10^-2	2.58×10^-2	2.289 5
	频谱校正^［14］	-1.62×10^-2	2.14×10^-2	1.876 1
	S-EKD^［20］	8.26×10^-3	-1.18×10^-2	1.002 4
	RD-S	4.89×10^-5	-1.92×10^-5	0.003 5

方法	幅值参数	相位参数/rad	位移解调误差
方法	幅值参数	相位参数/rad	均方根/μm	非线性度/%
EC^［12］	1.253 0	-0.258 9	14.762	0.264
GSOP^［13］	1.019 0	-0.193 9	6.922	0.145
频谱校正^［14］	1.022 0	-0.184 0	6.916	0.143
S-EKD^［20］	1.046 8	-0.196 2	3.129	0.094
RD-S	1.036 8	-0.191 9	1.647	0.051

方法测量	凹腔深度/μm						RMSE/μm
方法测量	叶片1	叶片2	叶片3	叶片4	叶片5	叶片6	RMSE/μm
激光	301.0	300.0	307.0	297.0	298.0	299.0
微波R1	301.6	302.5	304.6	297.1	292.3	291.4	2.996
微波R2	300.6	301.8	304.9	296.6	292.3	292.2	2.845
微波R3	300.5	302.1	304.7	296.4	291.8	292.7	3.122

Microwave measurement method for blade tip profile clearance through RD-S correction

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