Fault visualization method and system for fixed-shaft gear box

Abstract

The invention provides a fault visualization method and system for a fixed-shaft gear box, and provides a new feature which only appears in a fault state. A meshing resonance area in an MRgram of a healthy gearbox is concentrated in a wide frequency band interval, the occurrence of a local fault causes the occurrence of another high-frequency meshing resonance area in the MRgram, the newly occurring meshing resonance area can be used as a new feature for identifying the local fault of the gear, and due to the fact that the meshing resonance area only occurs in the fault state, therefore, the method can be used as a new, more intuitive and accurate gear local fault new feature to identify the local fault of the gear box, so that an original signal MRgram is compared with an MRgram of a health signal, and a new high-frequency band meshing resonance area in the MRgram of the original signal is identified, the resonance region can realize more intuitive and more reliable fault diagnosis of the fixed shaft gear box.

Description

technical field [0001] The invention relates to the technical field of signal processing, and more specifically, to a fault visualization method and system for a fixed-axis gearbox. Background technique [0002] When there is a partial fault in the fixed-axis gearbox, the corresponding meshing stiffness will also change periodically, and the frequency that repeats on the frequency spectrum is the rotation frequency of the gear with local faults, so this frequency can be considered as a characteristic of gear faults frequency, and this fault signature is modulated by the meshing frequency and its harmonics and appears as sidebands in the frequency spectrum. [0003] In fact, the increase in the number and amplitude of sidebands near the meshing frequency and its harmonics can characterize the fault condition, so the meshing frequency and its harmonic sidebands in the fault and healthy state are compared to identify the fault of the fixed-axis gearbox , is one of the widely u...

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Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a fixed-axis gearbox fault visualization method to overcome the problem of comparing the fault with the meshing frequency and its harmonic sidebands in the healthy state to identify the fault of the fixed-axis gearbox. Gear fault diagnosis strategy, but this method is not intuitive enough, and the problem of accurate local fault diagnosis cannot be guaranteed only by judging the increase in the amplitude and number of fault characteristic sidebands

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