System and method for detecting abnormality of bearing

Abstract

The invention discloses a symbolizing system and method for detecting abnormality of a bearing. The method comprises the steps of firstly, acquiring vibrating signals during the running time of the bearing at a certain time interval by utilizing an acceleration sensor, wherein vibrating data xn with the length as n can be acquired at each time; then performing probability density symbolization on each vibrating data; converting original vibrating signals into a symbolized sequence sn; determining a word length L of a coded sequence and coding the symbolized sequence sn; finally, calculating a standard difference of the coded sequence of each vibrating data and regarding the standard difference as a characteristic quantity for the abnormality detection of the running condition of the bearing. Compared with the traditional symbolizing method, the probability density symbolizing method adopted in the invention is more sensitive to the abnormal information of the bearing and can find faults earlier, so that great significance is achieved for the fault prevention, bearing maintenance and safe production.

Description

technical field [0001] The invention relates to the technical field of bearing fault diagnosis, in particular to a bearing abnormality detection system and method based on symbolic dynamics. Background technique [0002] Anomaly detection in a mechanical system refers to extracting features from a given data set, and using the extracted features to judge whether its state is normal or abnormal. With the rapid development of science and technology and modern industry, machinery and equipment in the machinery, energy, petrochemical, transportation and national defense industries of the national economy are increasingly large, high-speed, integrated and automated, which provides a strong guarantee for the rapid development of my country's economy . However, catastrophic accidents caused by mechanical equipment failures occur frequently. If the abnormal state of the mechanical system can be accurately and timely identified, it will be of great significance to the safe operation ...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the present invention provides a bearing anomaly detection system and its method, which are used to solve the loss of useful information in the symbol sequence due to improper division in the existing symbol dynamics-based bearing anomaly diagnosis technology The abnormality detection efficiency of the bearing caused by it is low and the defect is not sensitive to the abnormality

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