Fault Diagnosis of Circumferential Crack in Pipeline Based on Improved Hilbert-Huang Transform
In the process of manufacturing,processing,assembly and service,aircraft hydraulic pipelines may have planar defects.Under the action of seaworthy load,these defects will crack and expand,and eventually lead to pipe rupture and oil leakage.In order to diagnose the micro-crack in the pipeline,a self-built modal test platform and measurement and control system were used to collect and pre-process the vibration signals of the aviation hydraulic pipeline with circumferential cracks.However,in the process of Decomposition of pipeline vibration signals,it is difficult to obtain accurate intrinsic mode functions(IMF)due to the Mode aliasing problem of empirical mode decomposition(EMD)algorithm.In order to improve signal processing accuracy,an improved Hilbert-Huang transform method based on complete ensemble empirical mode decomposition with adaptive noise(CEEMDAN)and Hilbert transform theory is proposed to diagnose the ring crack of aviation hydraulic pipeline.The results show that this method can diagnose the circumferential crack fault of aviation hydraulic pipeline more accurately.
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