Cycloid bevel gear fault diagnosis method based on empirical mode decomposition and cepstrum

Abstract

The invention relates to a cycloid bevel gear fault diagnosis method based on empirical mode decomposition and cepstrum, and belongs to the technical field of fault diagnosis. The method includes the steps that (1), a cycloid bevel gear pair is measured through an acceleration sensor, and accelerated speed vibration signals are collected and used as signals to be analyzed; (2), the collected signals are guided into Matlab software to obtain original signals, and the original signals are decomposed into a series of intrinsic mode function (IMF) components through an empirical mode decomposition (EMD) method; (3), the IMF components of the previous orders are analyzed in a cepstrum mode to obtain amplitude cepstrum of the IMF components; (4), the amplitude cepstrum is drawn by adopting a drawing tool of the Matlab software, and fault feature information is extracted according to amplitude distribution in the cepstrum. The method can be applied to cycloid bevel gear fault diagnosis and can accurately extract fault feature frequency. A new method is provided for cycloid bevel gear fault diagnosis, and effective reference is provided for other rotating machine fault diagnosis technologies.

Description

technical field [0001] The invention belongs to the technical field of gear fault diagnosis, in particular to a cycloidal bevel gear fault diagnosis method based on empirical mode decomposition and cepstrum. Background technique [0002] The cycloidal bevel gear is the core transmission part of the heavy-duty swing-angle milling head of the heavy-duty turning-milling compound CNC machine tool. Since the processing object of the heavy-duty swing-angle milling head is a large complex surface, the cycloidal bevel gear is often subjected to vibration, impact, and variable loads. Working under unsteady conditions such as frequent reversing, pitting, wear, cracking and even broken teeth will occur. The fault state directly affects the performance of the oscillating milling head, resulting in unqualified parts processed by the CNC machine tool or the shutdown of the entire machine tool, and even a chain reaction, which seriously affects the safe production and economic benefits of ...

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Problems solved by technology

[0002] The cycloidal bevel gear is the core transmission part of the heavy-duty swing-angle milling head of the heavy-duty turning-milling compound CNC machine tool. Since the processing object of the heavy-duty swing-angle milling head is a large complex surface, the cycloidal bevel gear is often subjected to vibration, impact, and variable loads. , frequent reversing and other unsteady

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