Fault analyses of liquid rocket engine turbopumps based on Hilbert-Huang transforms

YANG Yi; CHEN Wenli; WANG Yongpeng; TANG Zuanjian; ZHAO Jing; GUO Huanlin; GUO Yanan

doi:10.16511/j.cnki.qhdxxb.2021.26.033

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (3) : 540-548. DOI: 10.16511/j.cnki.qhdxxb.2021.26.033

SPECIAL SECTION: AIR-BREATHING ENGINE AND AEROSPACE POWER TECHNOLOGY

Fault analyses of liquid rocket engine turbopumps based on Hilbert-Huang transforms

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Abstract

Turbopumps are important in liquid rocket engine (LRE) propulsion systems. Turbopump failures are also the main cause of LRE failures. The Hilbert-Huang transform (HHT) has been used to adaptively and accurately analyze non-stationary data. An analysis of real LRE test data showed that the end flying wing problem in empirical mode decomposition (EMD) can be effectively solved using the signal envelope non closed image extension method. The Hilbert transform of the intrinsic mode function (IMF) using the HHT analysis gives the Hilbert energy distribution spectrum in the time and frequency domains and the time amplitude spectrum after the IMF function reconstruction. These can be used to analyze vibration data from a liquid oxygen turbopump in the time and frequency domains to diagnose turbopump faults. This method is very useful for test data analyses and fault location in rocket engines and other complex assemblies.

Key words

liquid rocket engines / turbopump / Hilbert-Huang transform / mirror extension / empirical mode decomposition

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YANG Yi, CHEN Wenli, WANG Yongpeng, TANG Zuanjian, ZHAO Jing, GUO Huanlin, GUO Yanan. Fault analyses of liquid rocket engine turbopumps based on Hilbert-Huang transforms[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(3): 540-548 https://doi.org/10.16511/j.cnki.qhdxxb.2021.26.033

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