Forward and backward smoothing MUSIC method for spectrum analysis of blade tip vibration signal

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (10) : 208-214.

AERONAUTICS AND ASTRONAUTICS

Forward and backward smoothing MUSIC method for spectrum analysis of blade tip vibration signal

PING Yan1,WANG Zengkun*2,3,FAN Zhifei1,YUAN Chao1,YANG Zhibo3,QIAO Baijie3

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Abstract

Blade tip timing (BTT) is an effective technique for non-contact vibration measurement of rotor blades of aeroengine, but its sampling pattern leads to the highly undersampled property of the sampled signals. Anti-aliasing spectrum analysis is required to extract the key indicator of the rotor blade, which is natural frequency. The improved multiple signal classification (MUSIC) method using the forward smoothing strategy can achieve anti-aliasing but cannot fully utilize the advantages of the smoothing method. Therefore, this paper proposes a forward-backward smoothing MUSIC method for BTT signal processing. By establishing the symmetrical placement conditions of the sensor, the forward-backward smoothing is used to replace the forward smoothing to obtain a more accurate autocorrelation matrix estimate, thereby improving the blade natural frequency estimation performance. Through simulation and experiments, it is verified that the aliasing and noise suppression capabilities of the forward-backward smoothing MUSIC method are improved under the same sample number, algorithm parameters, etc.

Key words

blade tip timing / aeroengine rotor blade / multiple signal classification (MUSIC) / spatial smoothing / frequency estimation

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PING Yan1, WANG Zengkun2, 3, FAN Zhifei1, YUAN Chao1, YANG Zhibo3, QIAO Baijie3. Forward and backward smoothing MUSIC method for spectrum analysis of blade tip vibration signal[J]. Journal of Vibration and Shock, 2025, 44(10): 208-214

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