Using Hilbert-Huang Transform to Process and Analyze the Corrosion Acoustic Emission Signal of the Tank Bottom Plate

Abstract

In this article, Hilbert-Huang transform (HHT) is applied to the tank bottom corrosion acoustic emission signal de-noising processing and decomposition, the effective signals are explored and extracted, and a new method of noise reduction for acoustic emission signal is proposed. The acoustic emission signal of corrosion of tank bottom plate is processed and decomposed by Hilbert-Huang transform, and the energy ratio of each sub-signal in the original signal is calculated, the source data of each sub-signal is extracted, and the effective acoustic emission signal in the original signal is extracted. Using the calculation formula of acoustic emission amplitude, the amplitude of each sub-signal is calculated respectively. The results show that the amplitude of each sub-signal is smaller than that of the original signal. This method can be used to reduce noise and extract effective acoustic emission signals. And it provides the foundation support, to form the method of noise reduction processing and effective signal extraction for corrosion acoustic emission signal on the tank bottom plate. It has some application value to improve the accuracy of the evaluation results of the corrosion state of the tank bottom plate.