高度修正实现刚度等效的梁结构有限元建模方法  

A finite element modeling method of beam structures using height modification to realize stiffness equivalence

作　　者：袁强飞[1] YUAN Qiangfei(Function Structure Department,Shanghai Aircraft Design and Research Institute,Shanghai 201210,China)

机构地区：[1]上海飞机设计研究院功能结构部,上海201210

出　　处：《航空工程进展》2024年第1期89-96,共8页Advances in Aeronautical Science and Engineering

摘　　要：民用飞机中对于梁结构的有限元建模,一般采用刚度等效方法将梁建成杆单元与剪切板单元的组合形式,这种有限元简化方法仅能保证截面刚度与真实截面刚度近似等效,但有限元中的截面面积与实际面积却相差较大,致使有限元分析的结果不能准确反映结构严重部位的应力情况。针对传统刚度等效有限元建模方法的不足,提出一种采用高度修正的刚度等效有限元建模方法;将该方法的计算结果与传统建模方法的计算结果、理论计算结果、试验测量结果进行对比。结果表明:本文提出的高度修正的有限元建模方法比传统杆板系建模方法更准确,与试验结果更接近;将该方法用于民用飞机结构有限元建模,能够对真实结构进行更准确地模拟,分析结果也更精确。Based on the principle of equivalent stiffness,the FEM modeling of beam structures in civil aircraft design are usually simplified to the combination of rod elements and shear plane elements,which ensures the stiffness of the FEM cross-section almost equal to the designed section,however the areas of the two sections have great difference,thus the FEM results can not accurately reflect the stress in critical positions.To address the deficiencies in the existing method,a new method in which the height of the FEM cross-section is modified to realize stiffness equivalence is proposed in this article.The computation results of the proposed method are compared to the results of the traditional method and experiment results.It shows that the results of the proposed method is more accurate than the traditional method and close to the experiment results.This method can be used for finite element modeling of civil aircraft structures to simulate real structures more accurately,and the analysis results are also more accurate.

关 键 词：民用飞机 梁结构 刚度等效 应力 挠度 有限元 

分 类 号：V214[航空宇航科学与技术—航空宇航推进理论与工程] V216.1