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

Menga, Edoardo and Sánchez, María Jesús and Romero Olleros, Ignacio and Hernández, Santiago (2019). A sample-based approach to estimate the dynamic loads of components with nonlinear uncertain interfaces. "Aerospace Science And Technology", v. 87 ; pp. 369-378. ISSN 1270-9638. https://doi.org/10.1016/j.ast.2019.02.012.

Description

Title: A sample-based approach to estimate the dynamic loads of components with nonlinear uncertain interfaces
Author/s:
  • Menga, Edoardo
  • Sánchez, María Jesús
  • Romero Olleros, Ignacio
  • Hernández, Santiago
Item Type: Article
Título de Revista/Publicación: Aerospace Science And Technology
Date: April 2019
ISSN: 1270-9638
Volume: 87
Subjects:
Freetext Keywords: Nonlinear dynamics; Dynamic modifications; Uncertainty; Global sensitivity; Free-plays
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Mecánica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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 non-intrusive 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.

More information

Item ID: 64450
DC Identifier: http://oa.upm.es/64450/
OAI Identifier: oai:oa.upm.es:64450
DOI: 10.1016/j.ast.2019.02.012
Official URL: https://www.sciencedirect.com/science/article/pii/S1270963818319813?via%3Dihub#!
Deposited by: Memoria Investigacion
Deposited on: 07 Oct 2020 16:11
Last Modified: 07 Oct 2020 16:11
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