Proceedings ArticleDOI
Validation of DLR's sound shielding prediction tool using a novel sound source
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TLDR
In this article, an experimental validation methodology for DLR's acoustic shielding prediction boundary element code BEMPAR is presented, which is integrated into the overall aircraft noise prediction tool PANAM of DLR.Abstract:
This paper is concerned with an experimental validation methodology for DLR’s acoustic shielding prediction boundary element code BEMPAR. This code in turn will be integrated into the overall aircraft noise prediction tool PANAM of DLR. The presented validation concept is based on a novel laser-based sound source. Almost perfect monopole-type test signals may be produced with a frequency content up to roughly 100kHz in combination with a very small source extension. These characteristics make this technique especially attractive for shielding/installation tests, which typically have to be performed at relativey small scale. BEMPAR is a boundary element code (BEM) which solves for the scattered pressure field. Three generic test cases are evaluated, a circular plate, a long cylinder and DLR’s low noise aircraft (LNA-1) nacelle model. The outcome of this investigation clearly demonstrate the potential of BEMPAR for the prediction of installation eects.read more
Citations
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Journal ArticleDOI
The Boundary Element Method in Acoustics: A Survey
TL;DR: The boundary element method (BEM) was initially developed for Laplace's equation and has been applied in the context of acoustics or Helmholtz problems as mentioned in this paper, including half-space problems and modeling the acoustic field surrounding thin screens.
Proceedings ArticleDOI
On the Relevance of Convection Effects for a Laser-Generated Sound Source
TL;DR: In this article, a laser-generated sound source is used to generate a nearly omni-directional sound field, which is investigated experimentally to reveal its characteristics as a convected point heat source in a uniform flow.
Journal ArticleDOI
Fast acoustic scattering predictions with non-uniform potential flow effects
TL;DR: In this paper, a simulation of a full airplane configuration discretized by 550,000 boundary elements in a non-uniform potential flow is presented, where the boundary element method (BEM) is used to accelerate the matrix-vector products arising from the Helmholtz and Laplace BEM equations.
Aircraft Noise: The major sources, modelling capabilities, and reduction possibilities
TL;DR: In this paper, the authors presented the results of the first Joint DLR & TU Delft Aviation Noise Workshop, where four specific tasks were formulated in order to address the problem, i.e. identification of main aircraft noise sources on board of a given reference vehicle, assessment of simulation capabilities for noise prediction, identification and assessment of promising noise reduction concepts for the reference vehicle and integration of these measures on-board of the reference vessel.
Proceedings ArticleDOI
Fast Acoustic Scattering Simulations with Non-Uniform Potential Flow Effects
William Wolf,Sanjiva K. Lele +1 more
References
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Proceedings ArticleDOI
Airframe noise characteristics from flyover measurements and prediction
Michael Pott-Pollenske,Werner Dobrzynski,Heino Buchholz,Sebastien Guerin,Gerd Saueressig,Ullrich Finke +5 more
TL;DR: In this article, the results of dedicated wind tunnel studies were developed for both high lift devices' and landing gear noise to support the calculation of noise impact in the vicinity of airports, and flyover noise measurements were conducted on an Airbus A319 aiming at the validation of DLR's airframe noise prediction schemes.