Large-size ship propeller shaft system state monitoring method

Abstract

The invention discloses a large-size ship propeller shaft system state monitoring method which specifically comprises the following steps: selecting a monitoring position on a stern tube bearing; fixing an electric eddy current displacement sensor inside a bearing slot in the monitoring position; transmitting an axis center bias voltage signal detected by the electric eddy current displacement sensor in real time to a host computer through a data acquisition box by using the electric eddy current displacement sensor; calculating an axis center real-time position in the monitoring position by using the host computer according to the received signal; calculating the minimum gap of a bearing oil membrane in the monitoring position; comprehensively judging the operation state of a shaft system. Due to the adoption of the method, the minimum gap of the bearing oil membrane in the monitoring position is combined with a ship navigation state signal, real-time visible display is carried out, operation states of large-size ship propeller shaft systems can be visibly displayed with high precision, in case of shaft system operation faults, alarm signals can be transmitted out, and safe operation of the shaft systems can be ensured.

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

Images