Numerical approximations on the predictive responses of plates under stochastic and convective loads

Franco, Francesco; Rosa, Sergio De; Ciappi, E.

doi:10.1016/j.jfluidstructs.2013.06.006

Cited by 44 publications

(11 citation statements)

References 28 publications

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“…In order to correctly describe the partial correlation of the excitation, it is necessary to consider a large number of points on the excited surface and compute a large number of FRFs [24][25]. A study can be found in [26] which highlights the issues induced by the transformation of the pressure distribution into discrete locations (i.e. nodes), in particular the aliasing effect.…”

Section: Models) Discussion On Different Models Andmentioning

confidence: 99%

Simulation of the pressure field beneath a turbulent boundary layer using realizations of uncorrelated wall plane waves

Maxit

2016

The Journal of the Acoustical Society of America

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This paper investigates the modelling of a vibrating structure excited by a turbulent boundary 15 layer (TBL). Although the wall pressure field (WPF) of the TBL constitute a random excitation, the element-based methods generally used for describing complex mechanical structures consider deterministic loads. The response of the structure to a random excitation like TBL is generally deduced from calculations of numerous Frequency Response Functions. The result is that the process requires costly computational resources. To tackle this issue, an efficient 20 process is proposed for generating realizations of the WPF corresponding to the TBL. This process is based on a formulation of the problem in the wave-number space and the interpretation of the wall pressure field as uncorrelated wall plane waves. Once the WPF have been synthesized, the local vibroacoustic responses are calculated for the different realizations and averaged together in the last step. A numerical application of this process to a plate beneath 25 a TBL is used to verify its efficiency and ability to reproduce the partial space correlation of the excitation. Finally an application on a stiffened panel modelled with the finite element method is proposed to illustrate the interest of the proposed process.Running title: Numerical synthesis of random pressure field 30

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Section: Models) Discussion On Different Models Andmentioning

confidence: 99%

Simulation of the pressure field beneath a turbulent boundary layer using realizations of uncorrelated wall plane waves

Maxit

2016

The Journal of the Acoustical Society of America

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“…For a discretized approach, as standard FEM, the evaluation of the structural displacement cross-spectrum matrix to a statistically stationary and ergodic random excitation, such as TBL flow, can be performed as follows [6,10,12]:…”

Section: Modal Approaches For Stochastic Vibration Analysesmentioning

confidence: 99%

“…Even if this is a useful test-case, it is not industrially relevant and only few more complex applications are available. The predictive methodologies actually available in literature are mainly modal-based and energy-based [6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Among the modal approaches, there is the full finite element approach, which makes use of a discretisation of the structural operator in finite elements, whose size is, generally, strongly affected by the fluid loading wavelength at the design frequency of analysis, [10]. This is, for most of applications, lower than the structural one, increasing, thus, the size of the problem in terms of degrees of freedom (DoF).…”

Section: Introductionmentioning

confidence: 99%

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The modelling of the flow-induced vibrations of periodic flat and axial-symmetric structures with a wave-based method

Errico

Ichchou

Rosa³

et al. 2018

Journal of Sound and Vibration

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The stochastic response of periodic flat and axial-symmetric structures, subjected to random and spatially-correlated loads, is here analysed through an approach based on the combination of a wave finite element and a transfer matrix method. Although giving a lower computational cost, the present approach keeps the same accuracy of classic finite element methods. When dealing with homogeneous structures, the accuracy is also extended to higher frequencies, without increasing the time of calculation. Depending on the complexity of the structure and the frequency range, the computational cost can be reduced more than two orders of magnitude. The presented methodology is validated both for simple and complex structural shapes, under deterministic and random loads.

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“…The classic Finite Element Method (FEM) is a well-framed and accurate method that requires a finite element discretisation of the whole model, implicitly limiting its application range [1,2,3,4,5]. Alternative formulations have also been proposed to reduce the computational effort of the method [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

Simulating the sound transmission loss of complex curved panels with attached noise control materials using periodic cell wavemodes

et al. 2019

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The sound transmission loss of complex curved aircraft panels under diffuse acoustic field excitation is experimentally and numerically studied. Two different aircraft sidewall panels are considered: a thick composite sandwich panel and a thin aluminium panel with stiffening elements (stringers and frames). Both bare configuration and with attached soundproofing material are tested in laboratory conditions in coupled rooms. The numerical approach relies on a wave finite element method including modal order reduction at cell scale and an extension based on the transfer matrix method, for the inclusion of poroelastic treatments. The results obtained show that the proposed numerical scheme is efficient for predicting the sound transmission loss of such complex structures.

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Numerical approximations on the predictive responses of plates under stochastic and convective loads

Cited by 44 publications

References 28 publications

Simulation of the pressure field beneath a turbulent boundary layer using realizations of uncorrelated wall plane waves

Simulation of the pressure field beneath a turbulent boundary layer using realizations of uncorrelated wall plane waves

The modelling of the flow-induced vibrations of periodic flat and axial-symmetric structures with a wave-based method

Simulating the sound transmission loss of complex curved panels with attached noise control materials using periodic cell wavemodes

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