Vibration signal processing method based on HHT (Hilbert-Huang Transformation) and related analyses

Abstract

A vibration signal processing method based on HHT (Hilbert-Huang Transformation) and related analyses includes steps as follows: using EMD (empirical mode decomposition) to decompose vibration signals; carrying out related analyses to each mode component obtained through decomposition; carrying out Hilbert transformation to denoised signals and obtaining a Hilbert spectrum. Aiming at the defect that noisy signals cannot be distinguished in signals if the HHT method is applied directly, the invention provides the method based on HHT and the related analyses, and denoises noisy signals. Through analyses on the Hilbert spectrum of the extracted noisy mode components and a marginal spectrum, the frequency and amplitude information of noisy vibration signals can be effectively extracted. The method can be used for processing signals of metallurgical machinery, aerospace, hydropower engineering, aeromancy and so on, and effectively remove noise.

Description

technical field [0001] The invention relates to the technical field of vibration signal processing, in particular to a vibration signal processing method based on HHT transformation and correlation analysis. Background technique [0002] The application of various non-stationary signal processing methods in the fault diagnosis and processing of mechanical vibration signals has also promoted the development of fault diagnosis technology to a large extent, and the time-frequency analysis methods have also been continuously improved. Practice has proved the effectiveness of these signal processing methods, but at the same time each method has its own limitations. [0003] Since the HHT method was proposed, it has also achieved a series of applications in related fields. It has strong adaptability to the processing of non-stationary signals, and it has made up for the shortcomings of traditional time-frequency analysis methods to a large extent. Due to the good adaptability and...

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Problems solved by technology

Although the HHT algorithm has been improved to a certain extent in recent years, for example, when Huang proposed HHT, he also pointed out that there are still many areas that need to be improved in the HHT method, such as boundary processing, endpoint effects, modal aliasing, envelope or Problems in curve fitting, sieving stop criterion and EMD stop condition affect the analysis effect of HHT

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