A method and device for extracting two-dimensional and three-dimensional instantaneous features of oil film oscillation

Abstract

The invention relates to a two-dimensional and three-dimensional instantaneous feature extraction method and apparatus of oil whipping. The method comprises: a complex local characteristic-scale decomposition (CLCD) method being a binary feature scale decomposition method is put forward; oil whipping signals of a rotor at a same cross section in two vertical directions are collected and the signals form a binary rotating signal in a plural form; the signal is decomposed into a plurality of binary sub rotating signals in a plural mode adaptively by the CLCD and fundamental-frequency and half-frequency signals are separated from the signals; and Hilbert transform is carried out on the signals to obtain an oil whipping signal and two-dimensional and three-dimensional transient features. Because the CLCD carries out decomposition on the signals adaptively based on own characteristics and bilinear transform is used, the method has advantages of high adaptability, comprehensive instantaneousfeature extraction, fast speed, high efficiency, and good technical effects.

Description

technical field [0001] The invention relates to a two-dimensional and three-dimensional instantaneous feature extraction method and device for oil film oscillation, belonging to the technical field of mechanical vibration. Background technique [0002] In recent years, the fault diagnosis of rotating machinery has become a research hotspot. How to accurately extract the characteristics of vibration signals from fault vibration signals is the key to the study of rotating machinery faults. Rotating machinery exhibits different vibration intensities at different times and in different directions. The fault diagnosis method based on single-channel information will split the characteristic information of the rotor vibration signals in different directions, and cannot fully reflect the fault characteristics. Considering that the oscillating trajectory of each harmonic in the direction perpendicular to each other in the same section of the rotor is an ellipse in the steady state, p...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for extracting two-dimensional and three-dimensional instantaneous features of oil film oscillation, so as to solve the problems of long running time, low efficiency, non-uniform decomposition scale, and difficulty in extracting instantaneous features in the current identification process of oil film oscillation faults.

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