Evidence fusion method for mechanical fault diagnosis of electric propulsion ship shafting propulsion system

Abstract

The invention discloses an evidence fusion method for mechanical fault diagnosis of an electric propulsion ship shafting propulsion system. The method comprises the following steps: frequency domain characteristic signals of the positions of a pedestal and a support bracket and the like in different failure modes are obtained; reference value of input characteristics is determined via a K-means algorithm, and similarity distribution of samples is calculated; a casting point statistic table reflecting a relationship between input and failure modes is established, and an input evidence matrix table is obtained via conversion; classification ability and overall uncertainty of an input information source is calculated based on rough set theory and information entropy; reliability and evidenceweight of the input information source are determined; evidence reasoning rules are used to fuse evidence of input sample vector activation, and a failure mode is determined based on fusion results. The method can be used for effectively estimating mechanical failure modes of the shafting propulsion system through vibration signals obtained via a sensor installed on a ship; the method is low in cost and high in precision, and real-time detection and accurate diagnosis of mechanical failure of the electric propulsion ship shafting propulsion system can be realized.

Description

technical field [0001] The invention relates to an evidence fusion method for mechanical fault diagnosis of a shafting propulsion system of an electric propulsion ship, and belongs to the technical field of state monitoring and fault diagnosis of ship mechanical equipment. Background technique [0002] The mechanical equipment of electric propulsion ship shafting propulsion system is an extremely important equipment in the ship system, which is responsible for the transmission of navigational power. Its working status is related to the safety of shipping and is linked to economic benefits. The working environment of the mechanical equipment of the ship shafting propulsion system is relatively harsh, which accelerates the decline of equipment performance. The failure of equipment will often cause a series of chain reactions, which will eventually lead to the decline of the overall system performance, or even equipment collapse and system failure. Therefore, it is very necessa...

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Problems solved by technology

The failure of equipment will often cause a series of chain reactions, which will eventually lead to the decline of the overall performance of the system, or even equipment collapse and system failure. Therefore, it is very necessary and meaningful to study the mechanical fault diagnosis of the s

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