Method for monitoring fatigue stress of ship power pipeline

Abstract

The invention discloses a method for monitoring the fatigue stress of a ship power pipeline, and relates to the technical field of safety control of the power pipeline. The method comprises the following steps: establishing a stress analysis model of the power pipeline, and generating a stress comparison table of all monitoring points of the pipeline under a unit load condition; obtaining a time history curve of low-period cycle load and high-period cycle load on the pipeline during a ship navigation process; calculating and drawing a cumulative frequency table of low-period stress cycles of the monitoring points; calculating an equivalent gravity load factor of the pipeline; calculating the cumulative frequency table of high-period stress cycles of the monitoring points; and merging the cumulative frequency table of the low-period stress cycles with the cumulative frequency table of the high-period stress cycles of the monitoring points to obtain a complete cumulative frequency tableof stress cycle, so as to complete the fatigue analysis and check of the monitoring points of the ship pipeline. By adopting the method disclosed by the invention, the setting of sensors can be reduced, the situation that the sensors are directly attached to dangerous points for measurement is avoided, and the stress monitoring of any area in the ship power pipeline is completed indirectly.

Description

technical field [0001] The invention relates to the technical field of safety control of power pipelines, in particular to a method for monitoring fatigue stress of power pipelines of ships. Background technique [0002] The power pipeline is an important part of the energy system, which undertakes the task of transporting steam, water, oil and other working fluids and energy transfer, and is very important to the energy system. Generally, the working medium inside the power pipeline has high pressure. Under the action of alternating loads, once the structure is fatigued and damaged, a large amount of working medium will leak, which may cause serious safety accidents such as explosion, fire, poisoning, etc., resulting in huge economic loss. Especially for the ship energy system, because it is far away from the land, external rescue forces cannot quickly reach the accident area. Once the ship energy system has a power pipeline leakage accident, the consequences of the accide...

AI Technical Summary

Problems solved by technology

However, for the ship pipeline system, this method has the following problems: First, the power pipeline of the ship energy system is complex and huge, and there are many areas where fatigue damage may occur. To realize the stress monitoring of the entire pipeline, a large number of sensors and data collection equipment are required. The wires have high investment and maintenance costs, and the layout space is not allowed; second, the environment of the ship cabin is harsh, and the environment such as high temperature, high humidity, and vibration is not suitable for the long-term work of the stress sensor

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