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A sample-based approach to estimate the dynamic loads of components with nonlinear uncertain interfaces

机译：基于样本的方法来估计非线性不确定接口的动态负载

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摘要

Predicting aircraft dynamics and vibration loads at components' interfaces is a key task for ensuring a robust design and development of the product. Usually, whereas in the case of isolate components the dynamic behavior can be predicted quite accurately, when several components are assembled through discontinuous junctions the predictiveness of a model decreases. The junctions, whose mechanical properties are seldom well characterized experimentally, often introduce nonlinearities in the loads' path. Additionally, their behavior is intrinsically uncertain and as a consequence, the dynamic response of the connected structures becomes stochastic.We propose a sample-based approach which aims to cope with both aspects, nonlinearities and uncertainties, and can be split in two main tasks. First, the computational cost of each deterministic simulation is minimized considering that the global nonlinear behavior depends on localized sources of nonlinearities at the interfaces. Second, the uncertainties are propagated through the model by a nonintrusive method based on Sobol's low discrepancy design. Attention is paid to the global sensitivity indices, which are estimated by creating a meta-model based on Polynomial Chaos Expansion.An industrial application considering an aircraft component whose dynamic behavior is affected by uncertain free-plays at its interfaces is presented. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：预测组件接口的飞机动力学和振动载荷是确保产品的强大设计和开发的关键任务。通常，而在隔离组件的情况下，当通过不连续的结组装若干组件时，可以精确地预测动态行为，而模型的预测性降低。当实验表征的机械性能很少，通常在负载路径中引入非线性的连接。此外，它们的行为是本质上的，因此，连接结构的动态响应变为随机。我们提出了一种基于样的方法，旨在应对方面，非线性和不确定性，并且可以分为两个主要任务。首先，考虑到全局非线性行为取决于接口处的本地化的非线性源，最小化了每个确定性模拟的计算成本。其次，不确定因素通过基于Sobol的低差异设计的非流体方法来传播。通过创建基于多项式混沌扩展的元模型来估计全局敏感指数。在考虑其动态行为受到其接口处的不确定自由播放影响的飞机组件的工业应用程序估计。 （c）2019年Elsevier Masson SAS。版权所有。

著录项

  • 来源
    《Aerospace science and technology》 |2019年第4期|369-378|共10页
  • 作者

    Menga E.; Sanchez M. J.; Romero I.; Hernandez S.;

  • 作者单位

    Airbus Operat SL A John Lennon S-N Getafe 28906 Spain|Univ Politecn Madrid Jose Gutierrez Abascal 2 E-28006 Madrid Spain;

    Univ Politecn Madrid Jose Gutierrez Abascal 2 E-28006 Madrid Spain;

    Univ Politecn Madrid Jose Gutierrez Abascal 2 E-28006 Madrid Spain|IMDEA Mat Inst Eric Kandel 2 Getafe 28906 Spain;

    Univ A Coruna Campus Elvina S-N La Coruna 15071 Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nonlinear dynamics; Dynamic modifications; Uncertainty; Global sensitivity; Free-plays;

    机译：非线性动力学;动态修改;不确定性;全球敏感;自由扮演;

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