Planetary bearing distributed fault diagnosis and analysis method based on instantaneous angular velocity

Abstract

The invention discloses a planet bearing distributed fault diagnosis and analysis method based on instantaneous angular velocity. The method comprises the following steps: sampling an instantaneous angular velocity (IAS) signal value of a planet carrier; utilizing a linear prediction method to remove deterministic components of gear signals in the signals; further enhancing the fault signal by using a minimum entropy deconvolution (MED) method so as to extract a pulse hidden in the signal; carrying out adaptive modal decomposition on the filtered vibration signal; calculating a peak value anda correlation coefficient of the vibration signal; carrying out amplitude demodulation by using a Hilbert transform technology to form an envelope signal of the planetary bearing; converting the envelope signal into a frequency domain signal; obtaining required planet bearing distributed fault diagnosis information. The invention not only provides an effective method for separating and enhancing the distributed fault signals of the planet bearing, but also provides a fault analysis tool which uses the instantaneous angular velocity signals of the planet carrier as a wide prospect for calculating the fault vibration spectrum of the bearing, and important academic significance and engineering value are realized.

Description

technical field [0001] The invention belongs to the technical field of planetary gearboxes, and specifically relates to a planetary bearing distributed fault diagnosis and analysis method based on instantaneous angular velocity, which can quantitatively analyze the influence of planetary bearing distributed fault parameters in a planetary gear system, and proposes the use of planetary carrier instantaneous angular velocity As a tool for analyzing the vibration spectrum of bearing faults, it has important academic significance and engineering value. Background technique [0002] As one of the basic mechanical components, bearings play a vital role in wind power, automation equipment, aerospace and other fields. Failure of bearing components can lead to failure of mechanical components as well as failure of the overall mechanical system, resulting in significant financial losses and even loss of life in some cases. Distributed bearing faults are also one of the important reas...

AI Technical Summary

Problems solved by technology

[0004] In a planetary gear system, the inner ring of the planetary bearing is usually fixed to the planetary carrier, and the outer ring is closely connected to the planetary gear hole. This mechanism not only allows the planetary bearing to rotate around the planetary axis with the planetary gear, but also revolves around the planetary carrier together with the planetary gear. The sun gear and the ring gear rotate on a common axis, this new type of rotating mechanism poses a great challenge for bearing condition monitoring

At the same time, there are still few researches on the faults of distributed planetary bearings, especially the diagnosis methods are still immature.

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