Evaluation Method of Rolling Bearing Slip Rate Based on Vibration Information Demodulation Analysis

Abstract

The invention provides a rolling bearing slip rate evaluation method based on vibration information demodulation analysis, which uses a vibration sensor to collect high-frequency vibration signals, and simultaneously uses a key phase sensor to synchronously collect key phase signals, and obtains the packet of the original signal through Hilbert transform. The envelope demodulation signal, and then use the key phase information to perform linear equiangular interpolation on the envelope demodulation signal, obtain the envelope signal of the narrow-band impact by setting the narrow-band filter, and calculate its phase, use the phase calculation of the narrow-band impact envelope signal, etc. Using the equivalent reference shaft phase and speed, the envelope order spectrum analysis is performed again using the equivalent reference shaft phase, and the slip rate of the bearing is calculated using the equivalent reference shaft speed. The present invention can effectively suppress the order migration caused by slipping And fuzzy phenomenon, enhance the fault characteristics, and can estimate the bearing slip rate, and the evaluation accuracy is high.

Description

technical field [0001] The invention relates to the technical field of mechanical fault diagnosis, in particular to a method for evaluating the sliding rate of rolling bearings based on vibration information demodulation analysis. Background technique [0002] With the continuous installation of high-speed rail and high-performance aero-engines, the application of high-speed and large-overload rolling bearings is increasing, and the resulting sliding phenomenon of rolling bearings is becoming more and more serious, especially in complex working conditions with variable speed and variable load Down. Among them, the dynamic model can estimate the slip rate of the bearing by solving the equations of motion of the main parts of the rolling bearing while considering the main influencing factors, so it is widely used. However, the evaluation accuracy has always been a major factor that plagues the analysis of the slip rate of the dynamic model. In addition, for rolling bearings t...

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Problems solved by technology

Due to the closed structure of the rolling bearing, it is difficult to directly measure the motion process of the rolling bearing cage, so it is difficult to effectively calculate the slip rate based on the definition of the rolling bearing cage speed

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