Vibro-acoustic analysis of composite plate-cavity systems via CUF finite elements

Cinefra, Maria; Moruzzi, M. C.; Bagassi, Sara; Zappino, Enrico; Carrera, Erasmo

doi:10.1016/j.compstruct.2020.113428

Cited by 20 publications

(9 citation statements)

References 34 publications

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“…Finally, to evaluate the improvement of a Layer Wise model in a vibro-acoustic analysis, a coupled analysis is performed in order to solve the plate-cavity problem. The high reliability of the CUF compared to the classical Equivalent Single Layer theory has been already demonstrated by the work of Cinefra et al [20]. The aim is to validate this higher accuracy for the monopole too.…”

Section: Mul2 Validationmentioning

confidence: 82%

“…MUL2 has already been validated for acoustic computations in [20] by the authors themselves, where the natural frequencies of a cubic cavity were calculated. For the avoidance of doubt, the eigenfrequencies of the box cavity are estimated, both with MUL2 and Actran, and compared to the analytical ones.…”

Section: Cavity Validationmentioning

confidence: 99%

“…Table 1 The first ten natural frequencies [Hz] calculated by the analytical method, by MUL2 and by Actran with their relative errors and differences between the two software for a rectangular cavity [20] In the last case, the differences begin from the fifth decimal place elements, rising the number of nodes and so the degrees of freedom of the system. The results are compared in terms of pressure over the frequency.…”

Section: Mul2 Validationmentioning

confidence: 99%

“…The coupled equations are solved in a similar way of the Eq. 12 through the fundamental nuclei formulation [18][19][20]. The continuous displacements u i in the CUF formulation are expressed from the nodal displacement U for the k − th layer of the plate: in which N i are the shape functions and F k the thickness functions, which rebuild the solution on the thickness and they are based on Lagrange interpolation polynomials.…”

Section: Mul2 Validationmentioning

confidence: 99%

“…So MUL2 was expanded to work in the vibro-acoustic field, with the introduction of the acoustic model and of the resultant coupling. The reliability of the software (and of its numerical model) and its advantages have been already studied and estimated in [20], where the authors compare the MUL2's results with those obtained by analyses based on an Equivalent Single Layer (ESL) model for a cavity-plate coupled system.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of an Acoustic Monopole Source in a Closed Cavity via CUF Finite Elements

Moruzzi

Cinefra

Bagassi

2022

Aerotec. Missili Spaz.

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The noise generated by aircraft is an important issue, which affects the external environment and the passenger’s comfort. The researches about new acoustic solutions often lead to the exploitation of innovative materials, as visco-elastic panels or acoustic metamaterials, in order to rather obtain better acoustic properties than conventional materials, in particular at low frequency. Although, there is a lack of reliable tools able to describe the complex kinematic behaviour of these new materials at low frequency. A new strong formulation, the Carrera Unified Formulation (CUF) based on the Finite Element Method (FEM), enables a wide class of refined shell models, which is able to reproduce the frequency dependent dynamic response of complex multi-layered plates. This formulation, fully developed inside the MUL2 software, is applied to vibro-acoustic analyses too, so the need to integrate new sources and boundary conditions in the software, that are essential to model the acoustic problem. A simple and powerful source is the monopole: a pulsating sphere. This source can be a first try to model the complex sources that affect the noise inside the aircraft, as the engine or the internal sources. Moreover, monopoles are widely used to estimate the transmission loss. Hence, the reason for this work: the creation inside MUL2 of a monopole boundary condition and its validation, comparing the results with those of a well-known FEM based commercial software for vibro-acoustic analyses, Actran.

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Section: Mul2 Validationmentioning

confidence: 82%

Section: Cavity Validationmentioning

confidence: 99%

Section: Mul2 Validationmentioning

confidence: 99%

Section: Mul2 Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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