Fault analyses of liquid rocket engine turbopumps based on Hilbert-Huang transforms
YANG Yi1,2, CHEN Wenli2, WANG Yongpeng2, TANG Zuanjian3, ZHAO Jing4, GUO Huanlin5, GUO Yanan2
1. Department of Industrial Engineering, Tsinghua University, Beijing 100084, China; 2. Beijing Institute of Aerospace Test Technology, China Academy of Space Propulsion Technology, Beijing 100074, China; 3. School of Software, Tsinghua University, Beijing 100084, China; 4. Department of Engineering Management, School of Vehicle Transportation, Tsinghua University, Beijing 100084, China; 5. Department of Construction Management, School of Civil Engineering and Water Conservancy, Tsinghua University, Beijing 100084, China
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.
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2022, Vol. 62 
