Extraction method of condition monitoring index of rotating equipment based on vibration energy gradient decomposition

Abstract

A method for extracting state monitoring indicators of rotating equipment based on vibration energy gradient decomposition. First, several groups of vibration monitoring data are collected during the stable operation period of rotating equipment, and the detected data is decomposed into several sub-signals based on different energy gradients. The ratio before and after normalization of the sequence is used to calculate the corresponding energy scaling factor; then the real-time vibration monitoring data of the rotating equipment is collected, and the monitoring data is decomposed into several levels of sub-signals based on different energy gradients. The component characteristic energy is scaled; finally, the relative kurtosis ratio of the characteristic frequencies of the sub-signal components at each level is used as the weight, and the sub-signals corresponding to the same group of real-time vibration monitoring data are weighted and fused, and the fused characteristic energy is used as the rotating equipment running state monitoring. index; the present invention takes into account the calculation efficiency and reliability, and realizes the monitoring of the running state of the rotating equipment.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment diagnosis, and in particular relates to a method for extracting state monitoring indexes of rotating equipment based on vibration energy gradient decomposition. Background technique [0002] In the field of machinery industry, during the long-term operation of rotating equipment (bearings, gears, etc.), under the influence of alternating loads, small damages gradually occur in the structure of the equipment, and the degree of damage gradually increases with the increase of operating time, which makes the operating performance of the equipment continue to increase. The decrease will eventually lead to functional failure of the equipment, which will cause economic losses in the lightest, and major production safety accidents in the worst case. Therefore, in the actual production process, it is necessary to monitor the operating status of the equipment and evaluate the health status of t...

AI Technical Summary

Problems solved by technology

[0003] Vibration monitoring is an effective way to monitor the operating status of rotating equipment. Traditional equipment vibration monitoring methods mainly include two types: one is based on vibration data time domain and frequency domain statistical indicators (such as peak-to-peak value, root mean square value, kurtosis index etc.), this type of monitoring method is easily affected by the interference noise in the monitoring data, and it is difficult to characterize the operating status of different parts of the equipment (such as the inner ring, outer ring and rolling element of the rolling bearing), and to realize the positioning of the weak parts of the equipment; The second is vibration monitoring based on resonance energy envelope demodulation. The effectiveness of this type of monitoring method depends on the positioning accuracy of the vibration resonance zone, and the existing resonance zone positioning methods have the defects of cumbersome calculation and inaccurate positioning. Lack of practicality and reliability in the actual equipment production process

Images