Wind turbine structure high-cycle fatigue cross-platform simulation method based on multi-scale coupled modeling

By combining multi-scale coupled modeling and near-field dynamic fatigue model with rainflow counting method and linear damage accumulation criterion, the simulation accuracy and computational cost of fatigue crack propagation in wind turbine structures are solved, realizing efficient fatigue life prediction and safe management of wind turbine structures.

CN120145752BActive Publication Date: 2026-07-14HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HOHAI UNIV
Filing Date
2025-02-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately simulate the fatigue crack propagation process of wind turbine structures, especially under complex load conditions. Traditional methods suffer from high computational costs, poor adaptability, and insufficient simulation accuracy.

Method used

A multi-scale coupled modeling method is adopted, combining a near-field dynamic fatigue model with the finite element method. Through a multi-master node-single slave node multi-point constraint method, a multi-scale model of the wind turbine structure is established. Combining the rainflow counting method and the linear damage accumulation criterion, the fatigue life of the connecting key is dynamically updated to accurately simulate the crack propagation process.

Benefits of technology

It enables accurate simulation and life prediction of fatigue cracks in wind turbine structures, reduces computational costs, improves simulation accuracy and flexibility, and supports wind turbine design optimization and operation and maintenance.

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Abstract

The application discloses a wind turbine structure high-cycle fatigue cross-platform simulation method based on multi-scale coupling modeling, aims to accurately evaluate the fatigue damage state of the wind turbine structure under the action of high-cycle low-amplitude load, firstly establishes a multi-scale model based on the coupling of the finite element model unit of the whole structure of the wind turbine and the near-field dynamic model of the local cracking area, carries out wind turbine dynamic time history analysis by relying on a finite element analysis platform; then, response data are transmitted into a processing platform, the fatigue damage state of the connecting key is determined by combining a rain flow counting method and a linear damage accumulation criterion, the fatigue life attenuation value is calculated, the number of fatigue cycles required for local crack propagation is determined, and the remaining fatigue life of the unbroken key is updated; finally, the wind turbine model is corrected, the new broken key is removed from the crack tip, and the dynamic time history analysis and damage updating are repeated until the structure fails. The method realizes the whole process simulation of the fatigue crack propagation of the wind turbine and the fatigue behavior analysis, and provides an important reference for the design optimization and maintenance of the wind turbine.
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