• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (14): 194-198.

• 论文 • 上一篇    

飞机翼梁结构强度可靠性灵敏度分析

高宗战;刘志群;姜志峰;岳珠峰   

  1. 西北工业大学工程力学系;洪都集团650所
  • 发布日期:2010-07-20

Strength Reliability and Parameter Sensitivity Analysis for Airfoil Spar Structure

GAO Zongzhan;LIU Zhiqun;JIANG Zhifeng;YUE Zhufeng   

  1. Department of Mechanics, Northwesten Polytechnical University HongDu Group 650 Institution
  • Published:2010-07-20

摘要: 将翼梁结构中的所有结构尺寸、载荷大小、材料参数都当作结构设计时确定的具体值,对飞机翼梁结构进行强度分析,由强度分析可知,翼梁上的应力分布以及最大应力位置,可校核翼梁结构是否满足强度设计要求;考虑翼梁上下缘条、腹板1~5、翼肋1~5等厚度尺寸,由于加工、设计公差等造成实际翼梁结构尺寸的分散性,将这12个厚度参数作为正态分布的基本变量,对翼梁结构强度进行可靠性分析,并对基本变量分布参数的灵敏度进行分析;采用不含交叉项的二次响应面法对翼梁结构的强度可靠度进行分析,得到基本变量均为正态分布时翼梁结构强度的可靠度;并对基本变量参数影响结构可靠度的灵敏度进行分析,发现影响翼梁可靠度的主要因素是:腹板1、腹板5和下缘条的厚度分布参数。

关键词: 二次响应面法, 可靠性, 灵敏度, 翼梁

Abstract: For checking strength of airfoil spar structure, stress distribution is analyzed and the maximum stress and location are obtained by using software MSC NATRAN. Owing to machining deviation and design tolerance, the airfoil spar structure is always with some uncertainties such as material, loading and geometry. The thickness of strip, rib and web for the airfoil spar structure are expressed by base random variables. Due to the performance function of the strength reliability is an implicit one of the base random variables, finite element stress analysis is carried out by using software MSC NASTRAN and PANTRAN. Second order responds surface method is introduced to analyze the reliability of the structure. The parameter sensitivity is also analyzed, which shows that the thickness distribution parameters of web 3, web 4 and the blow strip have great influence on the reliability of structure strength.

Key words: Airfoil spar, Quadratic responds surface method, Reliability, Sensitivity

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