Diesel engine vibration impact source identification method based on multi-measuring-point information fusion

Abstract

The invention provides a diesel engine vibration impact source identification method based on multi-measuring-point information fusion. The method is based on a diesel engine online monitoring system.The vibration impact energy of a cylinder cover vibration signal is calculated and acquired. Uniform segmentation is performed for obtaining an impact energy maximal value matrix. A vibration impactenergy dimensionless matrix is defined and established. Furthermore a set structure is plotted for obtaining a distance matrix between two cylinders in all cylinders. An impact source determining condition is made based on the distance matrix. The impact source is identified according to the energy and a distance matrix characteristic. According to the method, fusion analysis is performed on multiple measuring point signals according to a vibration transmission attenuation rule. Through actual examination, vibration impact source identification and fault monitoring diagnosis of a four-stroke or a two-stroke diesel engine can be quickly and accurately realized. The method can be used for performing functions of performing source identification on the impacts from the same vibration source in different measuring point signals in normal operation, performing real-time monitoring on the operation health state of an actual set, and performing quick positioning diagnosis on the abnormal impact caused by a fault.

Description

technical field [0001] The invention belongs to the technical field of diesel engine fault monitoring and diagnosis, and relates to a method for identifying sources of diesel engine vibration and shock based on information fusion of multiple measuring points. Background technique [0002] As a power equipment widely used in the industrial field, the diesel engine has internal parts that cooperate with each other and has many vibration sources. The explosive combustion of the working fluid in the cylinder, the collision vibration of the moving parts, and the deformation and fracture of the coupling parts are all transmitted to the body surface through the connection. The cylinder head vibration signal contains effective vibration components and interference noise from different vibration sources; the transmission paths of the vibration sources are different, and the same vibration source is transmitted to multiple cylinder head surfaces through different paths to generate vibr...

AI Technical Summary

Problems solved by technology

[0005] The present invention relates to a diesel engine vibration shock source identification method, which is a diesel engine vibration shock source identification method based on multi-measuring point information fusion, which overcomes the problems that the traditional shock identification method relies on the prior knowledge of the unit and the shock aliasing of multi-measuring point signals. The new angle integrates the spatial distribution information of the cylinder head measurement points, and according to the vibration and shock transmission law, it changes the defects of the original identification method, such as low efficiency, low accuracy and high requirements for diagnosis, and meets the general use of engineering front-line equipment maintenance and management personnel. requirements, significantly improving the practicability of the online monitoring system

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