A Method of Envelope Demodulation of Impulse Signals Based on Peak-preserving Downsampling

Abstract

The invention provides a method for demodulating the envelope of an impulse signal based on peak preservation and downsampling. The method realizes the acquisition of the original signal envelope waveform through a peak extraction algorithm. The main calculation process of the extraction algorithm is signal difference, multiplication and comparison. After obtaining the envelope waveform, the envelope waveform is down-sampled by the peak-preserving down-sampling method to reduce the analysis frequency. Finally, the down-sampled data is Fourier transformed to obtain the spectral characteristics of the fault signal, and the relevant fault information of the equipment is obtained. The invention better solves the following problems in the current envelope demodulation method: needing priori parameters, poor real-time performance, loss of waveform peak information, loss of original signal attenuation characteristics and harmonic characteristics, and distortion of envelope waveform after demodulation , the method is suitable for impact feature extraction in rotating machinery fault diagnosis system, and is easy to integrate in real-time online system.

Description

Technical field [0001] The present invention relates to a mechanical fault diagnosis, and in particular to a hit signal envelope demodulation method based on peak retention drop samples. Background technique [0002] Rotating machinery is currently widely used in a variety of industrial scenes, whether it is gears or bearings, and its operational quality directly affects the working performance of the entire equipment. Once the failure of these rotating parts is not found in time, it can cause damage to the machine damage, or even casualties such as casualties. Therefore, the monitoring and analysis of early faults of similar devices is important. [0003] In the field of mechanical fault diagnosis, when the components such as rolling bearings or gears are partially damaged or defects, attenuating impacts are generated during load operation, this impact signal will excite the high frequency solid vibration of the components. This high-frequency solid vibration is a carrier signal...

AI Technical Summary

Problems solved by technology

Generally, interpolation resampling is used to reduce the analysis frequency. At this time, no matter which method is used, during the resampling process, if the time corresponding to the peak value of the original waveform does not coincide with its corresponding time point in the new signal time series , it will lead to the loss of the amplitude information of the envelope signal

Images