Fatigue analysis method and fatigue analysis device for structural parts in wind turbines

Abstract

The invention provides a fatigue analysis method and a fatigue analysis device of a structural member in a wind generating set. The method comprises the following steps: establishing a finite element model for a to-be-measured structural member involving bearing connection and related structural members thereof; applying load to the finite element model according to various preset load working conditions respectively; acquiring each node stress result of the to-be-measured structural member under each load working condition through finite element analysis; scaling down the acquired stress results by taking a fatigue load sequence which is pretreated through regularization as a coefficient; synthesizing the stress results under the different load components after scaling down to obtain a stress spectrum of each node of the finite element model of the to-be-measured structural member; calculating a fatigue damage value of the to-be-measured structural member according to the stress spectrum of each node and the stress-life curve of the to-be-measured structural member. By applying the method and the device, the fatigue analysis result of the structural member in the wind generating set is more accurate.

Description

Technical field [0001] The present invention relates to a fatigue analysis method, in particular to a method and a fatigue analysis device for fatigue analysis of structural parts involving bearing connection in a wind power generator set. Background technique [0002] The structural parts of wind turbines mainly bear or transmit complex dynamic loads, so fatigue failure is one of the main failure modes of structural parts of wind turbines. The accuracy of structural stress calculation results is very important to accurately calculate the fatigue damage location and damage size of structural parts. [0003] Bearings are important connecting parts in wind turbines, and have very strong nonlinear load transfer characteristics. It is precisely this characteristic of the bearing that has an important influence on the calculation of the stress of the structural parts, and thus the accuracy of its fatigue damage analysis. [0004] When the existing fatigue analysis method for structural ...

AI Technical Summary

Problems solved by technology

However, due to the nonlinear characteristics of the bearing, for each load component, the load transfer characteristics of the bearing will be significantly different even under the positive and negative loads of the same value, resulting in different stresses at the same node position state

Therefore, indiscriminate action directions of load components will lead to very large errors in fatigue calculation results, and even lead to changes in the location of fatigue hot spots

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