China Mechanical Engineering

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Assembly Variation Analysis of Compliant Parts Based on Mesh Deformation

SU Chengyang;WANG Zhiguo   

  1. College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,210007
  • Online:2019-10-10 Published:2019-10-10

基于网格曲面形状修改的柔性件装配偏差分析

苏成阳;王志国   

  1. 南京航空航天大学机电学院,南京,210007
  • 基金资助:
    国家自然科学基金资助项目(51275236)

Abstract: The sensitivity matrix of traditional finite element methods were derived from the product theoretical mathematical model in assembly deviation analysis of compliant parts. However, analysis results computed by traditional methods were inaccurate because of the shape errors between theoretical mathematical model and actual mathematical model. An improved method of assembly deviation analysis was presented herein. To obtain fitting model whose shape was close to actual mathematical model, mesh deformation was used to change the shape of theoretical mathematical model based on error source data of key points. The assembly spring back test of metal sheet and the assembly deviation analysis and calculation of aircraft panels were carried out. Different kinds of analysis results were obtained and compared by means of simulation, test and measurement. Result shows that the analysis error obtained by the improved method may be controlled to less than 5%.

Key words: compliant part, assembly deviation analysis, finite element method, theoretical mathematical model, mesh deformation

摘要: 柔性件装配偏差有限元分析方法中的敏感度矩阵来源于产品的理论数学模型,而理论数学模型与实际模型之间存在一定的外形差异,会产生很大的分析误差。针对该问题,提出了一种装配偏差分析的改进方法,即根据产品理论外形和误差源数据,运用网格曲面变形方法获取逼近零件实际形状的数学模型,代替理论数学模型进行装配偏差分析。开展了金属薄板的装配回弹试验以及飞机壁板件的装配偏差分析计算,使用仿真、试验及测量等手段获取了各类偏差分析结果,并进行比较。数据表明,装配偏差分析误差可减小到5%以内。

关键词: 柔性件, 装配偏差分析, 有限元方法, 理论数学模型, 网格曲面变形

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