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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >The bird's eye view on finite element method for structures with large stochastic variations
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The bird's eye view on finite element method for structures with large stochastic variations

机译:随机变化大的结构的有限元方法鸟瞰

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摘要

Extensive motivation to do an additional work in the finite element method in stochastic problems (FEMSP) is discussed. The qualitative comparison of FEMSP with the state of the art of the deterministic FEM is given. These observations and thoughts are then realized in several manners. We first present the exact inverse FEMSP which however cannot serve as a general tool for stochastic analysis of complex structures. The new variational principles for stochastic beams, for the mean response function, as well as response's auto-correlation function are formulated and the FEM based on the variational principles is presented. Finally, a general non-Perturbative FEM for stochastic problems with large variations is developed, based on the element-level flexibility. It is concluded that much work needs to be done in order FEMSP to be at the level compared to that of the deterministic FEM. The advantage of the main methods presented here over the conventional ones lies in their non--perturbational nature. Numerical examples are presented.
机译:讨论了在随机问题(FEMSP)中使用有限元方法进行其他工作的广泛动机。给出了FEMSP与确定性FEM技术的定性比较。这些观察和想法然后以几种方式实现。我们首先提出精确的逆FEMSP,但是它不能用作复杂结构随机分析的通用工具。提出了随机梁的新变分原理,平均响应函数以及响应的自相关函数,并提出了基于变分原理的有限元方法。最后,基于单元级的灵活性,开发了一种适用于变化较大的随机问题的通用非摄动有限元法。结论是,要使FEMSP达到确定性FEM的水平,还需要做大量工作。这里介绍的主要方法相对于常规方法的优势在于它们的非扰动性质。给出了数值示例。

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