Integrated FEM/BEM approach to the dynamic and acoustic analysis of plate structures

Kopuz, Şadi; Ünlüsoy, Y. Samim; Çalışkan, Mehmet

doi:10.1016/s0955-7997(96)00026-4

Cited by 12 publications

(3 citation statements)

References 11 publications

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“…The solution to (6) is usually not easy to compute and analytical solutions might not exist depending on the geometry and boundary conditions. Finite integral transforms might be obtained [23] or alternatively numerical solutions can be computed by the finite element and boundary element methods [24].…”

Section: Vibration Problemmentioning

confidence: 99%

Characterization and Modelling of Circular Piezoelectric Micro Speakers for Audio Acoustic Actuation

Mendoza-López

Sánchez-Solano

Huertas-Díaz

2012

ISRN Mechanical Engineering

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A study of circular piezoelectric micro speakers is presented for applications in the audio frequency range, including values for impedance, admittance, noise figures, transducer gain, and acoustic frequency responses. The micro speakers were modelled based on piezoelectric micro ultrasonic transducer (pMUT) design techniques and principles. In order to reach the audio frequency range, transducer radii were increased to the order of one centimetre, whilst piezoelectric layer thicknesses ranged the order of several μm. The micro actuators presented might be used for a variety of electroacoustic applications including noise control, hearing aids, earphones, sonar, and medical diagnostic ultrasound. This work main contribution is the characterization of the design space and transducer performance as a function of transducer radius, piezoelectric layer thickness, and frequency range, looking towards an optimized fabrication process.

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Section: Vibration Problemmentioning

confidence: 99%

Characterization and Modelling of Circular Piezoelectric Micro Speakers for Audio Acoustic Actuation

Mendoza-López

Sánchez-Solano

Huertas-Díaz

2012

ISRN Mechanical Engineering

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“…So, for an internal problem a FEM/FEM model is often quicker. For external unbounded problems BEM/FEM comes to its full right, since boundary elements satisfy the Sommerfeld radiation condition and therefore can handle Consequently, even if the exclusive usage of FEM to work out acoustic problems is still popular [2][3][4], nowadays, the most efficient approach to study the car vibroacoustic problems is based on the coupled usage of Finite Element Method (FEM) for vibration analysis and Boundary Element Method for acoustic analysis [5][6][7][8][9]. The possibility offered by BEM to reduce the dimensionality of the meshing domain is highly appreciated when considering the complex geometry of the car components; moreover, as previously said, BEM performs better for exterior problems (e.g., radiation from a component in an infinite domain).…”

Section: Bem/fem or Fem/femmentioning

confidence: 99%

Acoustic Analysis of an Exhaust MANIFOLD by INDIRECT Boundary Element Method

Citarella¹

2011

TOMEJ

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The present work is aimed at the development of a numerical procedure, based on the usage of the Boundary Element Method (BEM) as implemented in the software LMS Virtual.Lab, for the vibro-acoustics analysis of an exhaust manifold. The manifold vibrations are induced by two different ways: engine vibrations (transmitted to the manifold surfaces) and turbulences generated by the air flow in the exhaust system. The indirect BEM (IBEM), with a variational solution algorithm, is adopted to assess the exhaust manifold acoustic radiation. The modal analysis of the acoustic cavity is realized by the Finite Element Method (FEM) and the corresponding eigenfrequencies compared with those obtained by an IBEM forced response analysis and by experimental measurement. Experimental acoustic pressures at the manifold inlet and outlet are measured in anechoic room in order to compare with corresponding numerical predictions and assess the accuracy level obtained.

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“…In order to take advantage of both the FEM and the BEM, coupled finite element method/boundary element method (FEM/BEM) approaches have been proposed (Everstine, Henderson, 1990;Jeans, Mathews, 1990;1993). The coupled finite element method/boundary element method (FEM/BEM) is a conventional means of computing responses for fluid-structure interaction system (Kopuz, 1996;Tonga et al, 2007) and structural-acoustic problem (Choi, 1997;Chen et al, 2000;Coyette, 1999). As is well known, the coupled FEM/BEM is a conventional means of solving the structural-acoustic problem.…”

Section: Introductionmentioning

confidence: 99%

A Coupled Smoothed Finite Element-Boundary Element Method for Structural-Acoustic Analysis of Shell

Tian

Yao

2017

Archives of Acoustics

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Nowadays, the finite element method (FEM) - boundary element method (BEM) is used to predict the performance of structural-acoustic problem, i.e. the frequency response analysis, modal analysis. The accuracy of conventional FEM/BEM for structural-acoustic problems strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high frequency problem is also clear. In order to improve the accuracy of structural-acoustic problem, a smoothed finite-element/boundary-element coupling procedure (SFEM/BEM) is extended to analyze the structural-acoustic problem consisting of a shell structure interacting with the cavity in this paper, in which the SFEM and boundary element method (BEM) models are used to simulate the structure and the fluid, respectively. The governing equations of the structural-acoustic problems are established by coupling the SFEM for the structure and the BEM for the fluid. The solutions of SFEM are often found to be much more accurate than those of the FEM model. Based on its attractive features, it was decided in the present work to extend SFEM further for use in structural-acoustic analysis by coupling it with BEM, the present SFEM/BEM is implemented to predict the vehicle structure-acoustic frequency response analysis, and two numerical experiments results show that the present method can provide more accurate results compared with the standard FEM/BEM using the same mesh. It indicates that the present SFEM/BEM can be widely applied to solving many engineering noise, vibration and harshness (NVH) problems with more accurate solutions.

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Integrated FEM/BEM approach to the dynamic and acoustic analysis of plate structures

Cited by 12 publications

References 11 publications

Characterization and Modelling of Circular Piezoelectric Micro Speakers for Audio Acoustic Actuation

Characterization and Modelling of Circular Piezoelectric Micro Speakers for Audio Acoustic Actuation

Acoustic Analysis of an Exhaust MANIFOLD by INDIRECT Boundary Element Method

A Coupled Smoothed Finite Element-Boundary Element Method for Structural-Acoustic Analysis of Shell

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