Analysis of nonuniform under-sampling blade tip timing signal based on EDFT

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (5) : 39-45.

ZHANG Jiwang, DING Keqin

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Abstract

In order to solve the problem that it is difficult to analyze the blade vibration frequency caused by the serious nonuniform sampling and under-sampling of the tip timing signal, an analysis method of the tip timing signal based on the extended discrete Fourier transform (EDFT) is proposed. Different from the traditional Fourier transform, the EDFT takes the Fourier integral transform as the goal and uses the optimized transform basis function to replace the traditional DFT transform in the extended frequency range. The method is not restricted by Nyquist sampling theorem, which expands the frequency range and improves the frequency resolution. In order to verify the feasibility and reliability of the proposed method, the data generated by the mathematical model of sampling process and the test data are analyzed respectively. The results show that when the number of sensors is more than or equal to 3, the accurate blade vibration spectrum signal can be obtained based on the simulation data or test data, which shows that the proposed method can effectively solve the problem of spectrum analysis of nonuniform under-sampling tip timing signal, and has good anti-interference performance.

Key words

Extended DFT / nonuniform sampling / under-sampling / blade tip-timing

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ZHANG Jiwang, DING Keqin. Analysis of nonuniform under-sampling blade tip timing signal based on EDFT[J]. Journal of Vibration and Shock, 2021, 40(5): 39-45

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