Transient Sound Fields From Impacted Plates: Comparison Between Numerical Simulations and Experiments

Schedin, Staffan; Lambourg, Christophe; Chaigne, Antoine

doi:10.1006/jsvi.1998.2004

Cited by 34 publications

(15 citation statements)

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“…The uncoupled approach was also used to predict the acoustic pressure of impacted plates by rigid bodies [18]. By assuming a weak coupling, Lambourg et al [19] and Schedin et al [20] have simulated the plate by the FDM and the fluid by the Rayleigh method.…”

Section: Nomenclaturementioning

confidence: 99%

Symmetrization Procedure for Structure-Fluid Cavity System Involving Pseudostatic Correction

Alia¹,

Souli²

2010

AIAA Journal

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This paper deals with a pressure-displacement formulation based on the finite-element method of an elastoacoustic coupling problem. Since directly solving the resulting system is CPU intensive for large models, the solution is usually based on only a few uncoupled structural modes in vacuum and rigid cavity modes. However this classical pressuredisplacement formulation leads to nonsymmetric eigenvalue problems. Furthermore, if this method is accurate for weak coupling models, significant errors occur when the truncated modes are coupled to the ones used in the analysis. The present paper suggests a method combining the pseudostatic correction of the truncated modes in modal analysis with a symmetrization technique of the eigenvalue problems. It allows the calculation of the real coupled modes and frequencies, as well as the computation of an accurate elastoacoustic response, even for the strong coupling of a structure with a heavy fluid (liquid). It is less CPU expensive than the classical method, because it leads to a diagonalized system. = some fluid and some structure eigenvectors = diagonal matrix containing the eigenvalues of the coupled system f , s = fluid and structure volumes ! = pulsation

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Section: Nomenclaturementioning

confidence: 99%

Symmetrization Procedure for Structure-Fluid Cavity System Involving Pseudostatic Correction

Alia¹,

Souli²

2010

AIAA Journal

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“…Several papers on the behavior of propagating transient flexural waves in impacted plates have been reported [1][2][3]. Some manuscripts are surveyed sound radiated from impacted plates [4][5][6]. Olofsson et al [7,8] studied transient bending waves in tubes.…”

Section: Introductionmentioning

confidence: 96%

Impact noise radiated by collision of two spheres: Comparison between numerical simulations, experiments and analytical results

2011

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Impact is very common source of noise in the industries. The impacts can be visible, such as forging, and can be invisible, such as impacts due to clearance of hinges. As a result of this generality, the control of impact noise needs more attention. Reduction of this tiresome noise needs enough perception about the impact. A study of this noise sources presents difficult problems both theoretically and experimentally. This is partly due to the many complex interconnected mechanical phenomena that occur and partly due to the fact that usual steady-state techniques of analysis cannot be applied. In such complex problems numerical techniques can help to acousticians. To gain some insight into this source of sound, in this paper collision of two steel spheres are studied with finite element method (FEM). Then the FEM results were compared with experiments to show authority of this numerical method to simulate impact noises. FEM results show that if the vibrational modes are excited by impact, the vibrational modes can be as effective as rigid body motion.

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“…Lökberg 12 and Lökberg et al 13 developed and used phase-modulated TV holography, 14 electro-optic holography, for measurements of sound fields in air radiating from harmonically vibrating objects. Schedin et al [15][16][17] used pulsed holographic interferometry and pulsed TV holography to measure transient sound fields outside impacted plates and beams. Today it is also possible for us to "see the sound."…”

Section: Introductionmentioning

confidence: 99%

Locating primary sound sources in scattering media using multifrequency digital holographic reconstruction

2006

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Multifrequency digital holographic reconstructions of primary sound sources embedded in scattering media are demonstrated. The sound field is measured with a scanning laser Doppler vibrometer ͑LDV͒ and broadening of the spectral content of the sound source is achieved by tuning the primary ultrasound ͑US͒ transducer around its resonance frequency. The results show that combining the complex amplitudes from the different frequency reconstructions results in a reduced susceptibility to multiple scattered sound and makes possible a quite thorough localization of the primary sound source. The depth resolution obtained is 11 US frequencies. This depth sensitivity is improved even further to only 2.8 wavelengths by applying a filter determined from the standard deviation over the phases.

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Transient Sound Fields From Impacted Plates: Comparison Between Numerical Simulations and Experiments

Cited by 34 publications

References 0 publications

Symmetrization Procedure for Structure-Fluid Cavity System Involving Pseudostatic Correction

Symmetrization Procedure for Structure-Fluid Cavity System Involving Pseudostatic Correction

Impact noise radiated by collision of two spheres: Comparison between numerical simulations, experiments and analytical results

Locating primary sound sources in scattering media using multifrequency digital holographic reconstruction

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