A Fault Diagnosis Method for Oil Pump Bearings

Abstract

The invention discloses a bearing fault diagnosis method for an oil transfer pump, which is characterized by comprising the steps of (1) performing data acquisition on bearing vibration signals by adopting acceleration sensors, carrying out EMD (Empirical Mode Decomposition) and intrinsic mode function (IMF) envelope spectrum analysis, and obtaining sample data characteristic physical quantities;(2) processing the sample data characteristic physical quantities based on a bearing fault characteristic matrix to obtain BPA (Basic Probability Assignment) values to serve as BPA evidences; and (3)improving D-S evidence reasoning rules to fuse the BPA evidences so as to obtain a bearing fault diagnosis result. The bearing fault diagnosis method provided by the invention for the oil transfer pump can process a circumstance that partial data loses efficacy or is abnormal because of the existence of damaged sensors in the multiple bearing acceleration sensors.

Description

technical field [0001] The invention relates to the field of bearing fault diagnosis. In order to ensure oil pipeline transportation safety and economic benefits, a method for oil pump bearing fault diagnosis is proposed. In the case of identifying a bearing fault condition based on multiple sensor information. Background technique [0002] Petroleum is an important resource to ensure the rapid and stable development of the country's economy. As an efficient, economical and safe transportation method, pipeline transportation has become the preferred transportation method for petroleum transportation by virtue of its incomparable advantages over other traditional transportation. The oil pump has become the most critical moving equipment in pipeline transportation, and its stable operation directly affects the safety of the oil pipeline transportation system. [0003] At present, the diagnosis of oil pump bearing faults is mostly based on a single sensor for simple judgment, ...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a new method for oil pump bearing fault diagnosis, which uses multiple sensors to detect the data of oil pump bearings, and the application is improved based on D-S. The reasoning synthesis formula of the multi-evidence group identification information fusion, so as to carry out the fault diagnosis of the oil pump bearing

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