Bearing fault diagnosis resonance demodulator based on current mode

Abstract

The invention discloses a bearing fault diagnosis resonance demodulator based on a current mode, and relates to the technical field of bearing testing devices. The bearing fault diagnosis resonance demodulator comprises a high-Q band-pass filter, an envelope peak detector and an anti-aliasing filter. Compared with a resonance demodulator based on a voltage mode, the resonance demodulator based on the current mode has the advantages of being high in speed, wide in frequency band, low in voltage and low in power consumption. On the basis of stating the resonance demodulation basic principle, the bearing fault diagnosis resonance demodulator based on the current mode is realized through an improved current conveyor CCII. The demodulator can work normally at the microamp level and under high-frequency signals and can successfully extract bearing fault signals with impact characteristics from high background noise. Computer simulation and experiment results verify that signals output by the resonance demodulator have a smaller distortion factor and a higher signal-to-noise ratio and show the correctness of the demodulator.

Description

technical field [0001] The invention relates to the technical field of bearing testing devices, in particular to a current mode-based resonance demodulator for bearing fault diagnosis with high measurement accuracy. Background technique [0002] Modern industrial production is generally developing in the direction of high modernization such as continuous, high-speed and automation. The inevitable result of this development is that the scale of the modern production system is getting bigger and bigger, the function of the production system is getting stronger and stronger, and the mechanical performance indicators are getting better and better. High, the composition of equipment is becoming more and more complex. It is very necessary to carry out online monitoring, fault diagnosis and fault prediction for the key moving parts of large mechanical equipment. In the course of our research on bearing fault diagnosis, we have successfully applied resonance demodulation technology...

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