Transparent acoustic source condition applied to the Euler equations

Hwang, Chang-Jeon; Lee, Duck-Joo

doi:10.2514/3.12718

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The condition for the inlet boundary to be nonreflective, yet at the same time a source plane, is achieved by the addition of a source term to the boundary condition for the downstream running pressure wave (c 3 ), similarly to that of Hwang and Lee [21]. The complete set of equations at the inflow boundary is given by…”

Section: Inflow Conditionsmentioning

confidence: 99%

Time-Domain Numerical Simulation of a Flow-Impedance Tube

Özyörük¹,

Long

Jones

1998

Journal of Computational Physics

108

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Section: Inflow Conditionsmentioning

confidence: 99%

Time-Domain Numerical Simulation of a Flow-Impedance Tube

Özyörük¹,

Long

Jones

1998

Journal of Computational Physics

108

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“…Accordingly, the incident pressure, obtained from Eqn. (2), is decomposed into its frequency components through a fast Fourier transform to extract the spectral content of the signal. As depicted, the superior performance of the designed matched source is evident, as it overcomes the inherent limitations of conventional loudspeakers, which are unable to provide a desired incident tone in proximity of nonlinear oscillators due to unavoidable reflections from their moving diaphragm.…”

Section: Resultsmentioning

confidence: 99%

“…While the development of a perfectly matched sound source remains a challenge, numerous theoretical studies have been conducted assuming that there are no reflections from the source [1][2][3][4]. This assumption, however, is not always realistic when studying objects with nonlinear dynamics, especially when they are positioned in close proximity to the source.…”

Section: Introductionmentioning

confidence: 99%

Corona-discharge acoustic transducer as a perfect matched acoustic source

Vesal,

Lissek

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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A reliable sound source is essential in acoustic facilities, such as impedance tubes. However, conventional loudspeakers, regardless of their design, are prone to sound reflections, contrarily to theoretical matched sources. This can severely compromise the accuracy of the measurements, especially for nonlinear devices under test, where the unavoidably reflected harmonic components are likely to pollute the measurements. To be able to experimentally assess the performance of nonlinear systems, an ideal matched sound source capable of generating, without reflecting, a prescribed incident pressure is still missing. The corona discharge transducer consists of a membrane-less flow velocity source which is inherently transparent to sound. When backed with an anechoic termination (e.g. melamine foam wedge), one can generate sound while avoiding any reflection from the back, resulting in an actual matched source. An experimental prototype of such matched source has been designed and assessed in an impedance tube, focusing on linear frequency response and harmonic distortion analysis. Finally, the matched source is employed for assessing non-linear systems in impedance tube, and compared to conventional loudspeaker, to provide a practical demonstration of its capabilities under realistic conditions.

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