Variation simulation for deformable sheet metal assemblies using finite element methods
Variation simulation for deformable sheet metal assemblies using finite element methods
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DOI：
10.1115/1.2831115
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发表时间：
1997-08
影响因子：
4
通讯作者：
S. Liu;S. Jack Hu
中科院分区：
文献类型：
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作者：
S. Liu;S. Jack Hu
传统的变差分析方法，如根和平方法和蒙特卡罗模拟，由于装配过程中零件可能发生变形，因此不适用于钣金组件。本文提出利用有限元方法建立具有复杂二维或三维自由曲面的可变形钣金件的力学变化仿真模型。机械变差仿真将工程结构模型与统计分析相结合，为预测装配变差提供了改进的分析方法。直接蒙特卡罗模拟在有限元中是非常耗时的，因为需要数百或数千次有限元运行才能获得真实的装配分布。一种基于影响系数法的替代方法被开发出来以提高计算效率，产生了几个数量级的改进。两种方法的模拟结果几乎相同。一个实例说明了所开发的用于评估钣金装配变化的方法。新的方法提供了一个更好的理解钣金装配过程。
Traditional variation analysis methods, such as Root Sum Square method and Monte Carlo simulation, are not applicable to sheet metal assemblies because of possible part deformation during the assembly process. This paper proposes the use of finite element methods (FEM) in developing mechanistic variation simulation models for deformable sheet metal parts with complex two or three dimensional free form surfaces. Mechanistic variation simulation provides improved analysis by combining engineering structure models and statistical analysis in predicting the assembly variation. Direct Monte Carlo simulation in FEM is very time consuming, because hundreds or thousands of FEM runs are required to obtain a realistic assembly distribution. An alternative method, based on the Method of Influence Coefficients, is developed to improve the computational efficiency, producing improvements by several orders of magnitude. Simulations from both methods yield almost identical results. An example illustrates the developed methods used for evaluating sheet metal assembly variation. The new approaches provide an improved understanding of sheet metal assembly processes.