A Vibration Fault Monitoring Method for Ship Propulsion Shafting Bearings

Abstract

The invention discloses a method for monitoring a marine propulsion shafting bearing vibration failure. The method comprises the following steps: (1) creating a marine propulsion shafting vibration template library in an off-line mode; (2) synchronously collecting various monitor variables, including marine propulsion shafting bearing vibration acceleration signals, the host rotating speed, the propeller shaft rotating speed and the gearbox joining state; (3) classifying data; (4) performing time-frequency transformation on the classified vibration acceleration speed data by adopting a wavelet packet analysis method to acquire energy feature vectors on different feature frequency bands, transforming feature data of different frequency bands, and extracting the energy entropy feature vectors of the feature data to serve as to-be-matched feature vectors; (5) monitoring a failure, namely determining a specific failure type according to the similarity measure matching result; and (6) online updating the marine propulsion shafting vibration template library by utilizing the energy entropy feature vector which has no failure found in detection. The method is convenient and feasible to collect data, can be used for online monitoring and failure diagnosis, and can meet the requirement of long-term failure diagnosis and analysis.

Description

technical field [0001] The invention belongs to the technical field of safety monitoring of ship power devices, and relates to a method for monitoring operation faults of ship propulsion shafting, in particular to a method for monitoring vibration faults of bearings of ship propulsion shafting. Background technique [0002] In the ship propulsion shafting system, the bearing is an important part of the ship's power plant system. As the carrier of the energy transfer of the ship's operation, the consequences of the accident caused by the failure are quite serious. Therefore, the reliability and stability of the bearing are of great significance to the safety of the ship. . Due to the special position of the bearing in the entire shafting system and the harsh environment, it is not convenient for maintenance personnel to maintain and overhaul the shafting system. In addition, when a minor fault occurs in the bearing, it is difficult to detect the fault from the surface or thr...

AI Technical Summary

Problems solved by technology

Due to the special position of the bearing in the entire shafting system and the harsh environment, it is not convenient for maintenance personnel to maintain and overhaul the shafting system

In addition, when a small fault occurs in the bearing, it is difficult to detect the fault from the surface or through some detection equipment, which increases the difficulty of maintenance

In the existing technology, the method of vibration analysis is usually used in the analysis of bearing faults, but it is difficult to determine the type of fault by simply adopting spectrum analysis or power spectrum analysis, which is not conducive to the diagnosis of faults

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