基于无网格法的风力发电机塔架门框强度分析

Strength Analysis of Wind Turbine Tower Doorframe Based on Meshless Method

针对风力发电机的塔架门框强度分析中,传统有限元方法建模复杂耗时的问题,提出一种基于无网格法的仿真模型。采用ANSYS和Simsolid软件,分别建立五组机型(3.6~6.25 MW)塔架门框的有限元和无网格仿真模型;计算塔架变形、门框极限应力,以及焊缝热点应力,比较两类模型的计算结果。研究结果表明:两类模型计算塔架变形趋势一致,最大位移相对误差0.94%~1.87%;在门框、焊缝极限应力方面,模型的相对误差分别在0.36%~4.63%之间、-0.50%~3.38%之间;无网格法在刚度、应力计算可靠的同时,建模效率显著提高,为塔架门框快速仿真评价提供了一种新的研究思路。

Aiming at the complex modeling and time-consuming problem during the traditional finite element analysis(FEA)for the wind turbine tower doorframe,a simulation model based on meshless method was proposed.By means of ANSYS and Simsolid softwares,finite element and meshless simulation models of five types of tower doorframes(3.6 MW~6.25 MW)were established respectively.The deformations of the towers,the limit stresses of the doorframes,and the hot spot stresses along the weld toes,were calculated and compared between these two kinds of models.The results indicate that the deformation trends of the towers calculated by the two models are consistent,and the relative errors of the maximum displacements are between 0.94%~1.87%.In terms of ultimate stresses of doorframes and weld toes,the relative errors of the models are between 0.36%~4.63%and-0.50%~3.38%respectively.In general,the meshless method shows high reliability in stiffness and stress calculations.With an efficient modeling process,the method provides a new idea for rapid simulation evaluation of tower doorframe.