Method and system for modeling and optimizing fatigue life of lng ship pipe fittings

By deploying monitoring nodes in LNG ship pipe fittings, a fatigue life simulation model coupling pipe fitting-temperature-load was established, and fatigue life simulation parameters were optimized. This solved the problem of inaccurate fatigue damage distribution simulation in static modeling and achieved high-precision fatigue life prediction.

CN120509243BActive Publication Date: 2026-06-02JIANGSU XINGYANG PIPE FITTINGS SHARE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU XINGYANG PIPE FITTINGS SHARE CO LTD
Filing Date
2025-05-08
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing static modeling techniques cannot accurately predict the fatigue life of LNG ship pipe fittings under complex thermal-vibration coupled loads, resulting in inaccurate simulation of fatigue damage distribution and making it difficult to meet the requirements of high-precision fatigue life management.

Method used

Monitoring nodes are deployed in the pipe fittings of LNG ships to establish a fatigue life simulation model that couples pipe fitting, temperature and load. Damage constraints are determined by cross-correlation coefficients, and thermal fatigue damage is extracted by applying low-temperature thermal cycling loads. Cost optimization is performed by combining damage constraints and thermal fatigue losses to optimize the parameters of the fatigue life simulation model.

Benefits of technology

It achieves accurate modeling of fatigue life simulation under thermal-vibration loading conditions, improves the modeling accuracy of fatigue damage distribution and evolution path, dynamically matches the optimal control parameters, and improves the accuracy and adaptability of fatigue life prediction.

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Abstract

The application provides an LNG ship pipe fatigue life modeling optimization method and system, and establishes a fatigue life simulation model of low-temperature pipes; fatigue state constraints are applied to fatigue damage structures in the fatigue life simulation model based on load spectrum and temperature spectrum at monitoring nodes, damage constraint conditions of target low-temperature pipes under vibration states are obtained; thermal fatigue losses of fatigue life simulation under different low-temperature thermal cycle loads are determined according to thermal fatigue damage and load spectrum characteristics of each connection position under different low-temperature thermal cycle loads; fatigue life control parameters of the fatigue life simulation model are cost optimized according to the damage constraint conditions and all thermal fatigue losses, optimal cost parameters of fatigue life simulation under thermal-vibration load conditions are obtained, and local grid density of the fatigue life simulation model is adjusted based on the optimal cost parameters. By adopting the scheme of the application, parameter cost optimization of the fatigue life simulation model of the LNG ship pipe under thermal-vibration load conditions can be realized.
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