A semi-supervised fault diagnosis method for the propulsion system of a semi-submersible ship

Abstract

The invention discloses a semi-supervised fault diagnosis method for the main propulsion system of a semi-submersible ship. The method includes the following steps: using different sensors to monitor the state signal of the main propulsion system of the semi-submersible ship in real time, and obtaining multi-sensor monitoring signal data; using a convolutional coding network to reconstruct and reduce the dimensionality of the multi-sensor monitoring signal to realize different sensor monitoring signal dimensions Alignment; the multi-sensor monitoring signal can be probabilistically reconstructed by using the variational autoencoder network, and the reconstruction error is used as the fault degree index of the overall operating state of the main propulsion system of the current semi-submersible ship. When the index is greater than the set threshold, it is regarded as a fault state. The invention can recognize the abnormal state of the overall operation state of the main propulsion system of the semi-submersible ship only by using the multi-sensor monitoring data in the normal state.

Description

technical field [0001] The invention belongs to the field of fault diagnosis, and in particular relates to a semi-supervised fault diagnosis method for the main propulsion system of a semi-submersible ship. Background technique [0002] The main purpose of semi-submersible ships is long-distance transportation of large cargo and equipment, so the safety and reliability of the propulsion system during long-distance voyages is an important monitoring indicator for semi-submersible ships in service. The propulsion system of a semi-submersible ship using a conventional shafting propeller is configured with a main propulsion system, a bow thruster and a tail thruster, wherein the main propulsion system includes a propulsion motor, a reduction gearbox, a long shafting and a fixed-pitch propeller. [0003] The rotating parts of the propulsion system of the semi-submersible ship have been in service for a long time in a humid environment with high temperature and high pressure, and ...

AI Technical Summary

Problems solved by technology

[0003] The rotating parts of the propulsion system of the semi-submersible ship have been in service for a long time in a humid environment with high temperature and high pressure, and failures of the main shaft, bearings, gears and other components may occur, which will seriously affect the work of the semi-submersible ship

At present, the fault intelligent diagnosis of the overall system state of the semi-submersible propulsion system is still a challenge

Especially under different sea conditions, the problem of how to integrate multi-sensor fusion diagnosis has not been solved due to the difference in the damage characterization received by different sensors

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