Effect and identification of parametric distributed uncertainties in longitudinal wave propagation

Machado, Marcela Rodrigues; Santos, J. M. C. dos

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Campo DC	Valor	Idioma
dc.contributor.author	Machado, Marcela Rodrigues	-
dc.contributor.author	Santos, J. M. C. dos	-
dc.date.accessioned	2022-02-12T01:48:44Z	-
dc.date.available	2022-02-12T01:48:44Z	-
dc.date.issued	2021-10	-
dc.identifier.citation	MACHADO, M. R.; SANTOS, J. M. C. dos. Effect and identification of parametric distributed uncertainties in longitudinal wave propagation. Applied Mathematical Modelling, v. 98, p. 498-517, out. 2021. DOI: https://doi.org/10.1016/j.apm.2021.05.018. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0307904X21002638. Acesso em: 11 fev. 2022.	pt_BR
dc.identifier.uri	https://repositorio.unb.br/handle/10482/42865	-
dc.language.iso	Inglês	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Acesso Restrito	pt_BR
dc.title	Effect and identification of parametric distributed uncertainties in longitudinal wave propagation	pt_BR
dc.type	Artigo	pt_BR
dc.subject.keyword	Método WKB	pt_BR
dc.subject.keyword	Propagação de ondas	pt_BR
dc.rights.license	© 2021 Elsevier Inc. All rights reserved.	pt_BR
dc.identifier.doi	https://doi.org/10.1016/j.apm.2021.05.018	pt_BR
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/abs/pii/S0307904X21002638	pt_BR
dc.description.abstract1	Uncertainties play an important role in dynamic systems regarding their vibration and wave propagation behaviour. Stochastic methods have been used to address the randomness incorporated in numerical models. The spectral element method (SEM) is suitable to perform vibration and wave propagation analysis based on large frequency ranges with accuracy and low computational cost. This paper explores the longitudinal wave propagation considering uncertainties in the media aside from demonstrating and quantifying the effect of randomness inherent in the material. The stochastic Love rod spectral elements are proposed, and the parameters were assumed to be spatially distributed alongside the structure expressed as a random field. It is expanded using the Karhunen-Loève spectral decomposition and memoryless transformation. The Wentzel-Kramers-Brillouin (WKB) approximation is a powerful tool to evaluate local impedance changes slowly. It is used to indicate and quantify a changing rate related to material properties varying along the rod. Numerical examples analyse wave propagation in a longitudinal waveguide with distributed parameters.	pt_BR
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