A method for monitoring the state of propulsion shafting of large ships

Abstract

The invention discloses a method for monitoring the state of a propulsion shafting system of a large ship, which specifically includes the following steps: selecting a monitoring position on a stern tube bearing; fixing an eddy current displacement sensor in a bearing groove at the monitoring position; The shaft center offset voltage signal detected at the time is transmitted to the host computer through the data acquisition box, and the host computer calculates the real-time position of the shaft center at the monitoring position according to the received signal; calculates the minimum clearance of the bearing oil film at the monitoring position; comprehensively judges the axis System running status. The present invention combines the minimum clearance of the bearing oil film at each monitoring position with the ship's navigation status signal for real-time visual display, which can intuitively and accurately display the running status of the propulsion shafting of large ships, and when the shafting fails, it can An alarm signal is issued to ensure the safe operation of the shaft system.

Description

technical field [0001] The invention relates to the technical field of ship building, in particular to a method for monitoring the state of a propulsion shafting system of a large ship. Background technique [0002] The fault judgment method of ship propulsion shafting based on the temperature sensor of stern tube bearing and intermediate bearing has been widely used in small and medium-sized ships, and plays an important role in judging the state of shafting. However, due to the hysteresis of the temperature signal, it is often the friction between the shafting and the bearing to a certain extent that causes the high temperature alarm of the bearing. When the high temperature alarm occurs, the bearing is often burned out. [0003] Ship propulsion shafting design and fault diagnosis involve various disciplines such as shafting alignment, hydrodynamic lubrication, propeller dynamic hydrodynamics, ship manipulation, etc. At present, relying solely on the signal analysis of bea...

AI Technical Summary

Problems solved by technology

[0003] Ship propulsion shafting design and fault diagnosis involve various disciplines such as shafting alignment, hydrodynamic lubrication, propeller dynamic hydrodynamics, ship manipulation, etc. At present, relying solely on the signal analysis of bearing temperature sensors to determine the cause of shafting faults is relatively abstract and cannot be accurately determined cause of issue

[0004] At the same time, due to the development of large-scale and light-weight ships, the stiffness of the large-diameter shafting does not match the stiffness of the hull, and the application of low-speed, large-diameter propellers makes the dynamic load of large-scale ship propulsion shafting more and more Complex, especially for large liquefied natural gas ships with dual shafts, the mutual influence of the twin propellers makes the ship's propulsion shafting likely to fail at any time

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