A three dimensional parabolic equation method for sound propagation in moving inhomogeneous media

Cheng, Rui; Morris, Philip J.; Brentner, Kenneth S.

doi:10.1121/1.3203934

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Li and Wang [6] concluded, based on their analytical considerations, that the effect of wind can be ignored in the crosswind situation because the effective Mach number is zero under such circumstances. Cheng et al [8] reported that in crosswind directions, there is no acoustic refraction in the vertical direction, and the sound pressure level is thus "only slightly" affected by the wind. By means of 2D and 3D Fast Field Program (FFP) calculations, Salomons [1] found that crosswind has no effect on sound propagation from a point source and concluded that 2D modelling, so neglecting crosswind, is accurate.…”

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confidence: 99%

Numerical Investigation of the Effect of Crosswind on Sound Propagation Outdoors

Hornikx¹,

Renterghem²

2016

Acta Acustica united with Acustica

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The effect of wind on sound propagation in the atmosphere has been studied extensively before with an emphasize on downwind sound propagation, typically representing worst--case scenarios. However, the influence of oblique and crosswind on propagation from various types of sources raises some questions in acoustic literature. In this work, the effect of a logarithmic wind speed profile at different wind directions has been studied for sound emitted by a point source, a coherent line source and an incoherent line source. For this purpose, a full three--dimensional wave--based method was used. For the incoherent line source simulation, the Harmonoise engineering approach based on a summation of source segments was considered as well and shows to be in satisfying agreement with the latter. While for a point source and coherent line source crosswind shows to have an insignificant effect, it is important in case of an incoherent line source. Also, the stretch of the incoherent line source contributing to the noise level at a receiver close to this line differs strongly depending on the wind direction. PACS 43.20.El, 43.28.Fp, 43.28.Js 2 Introduction Sound propagation outdoors is strongly influenced by the refractive state of the atmosphere [1]. Phenomena linked to either downwind or upwind sound propagation have been studied extensively.

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confidence: 99%

Numerical Investigation of the Effect of Crosswind on Sound Propagation Outdoors

Hornikx¹,

Renterghem²

2016

Acta Acustica united with Acustica

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“…This interaction had eventually led Ken to join the Penn State faculty and begin to develop collaborations with Phil. With another batch of PhD student advisees, Phil and Ken produced several publications: Cheng et al, 42 Lee et al, 43 Morris and Miller, 44 and Lopes et al 45 Ken stated that Phil always brought a strong analytical expertise to the problem and a vigorous and useful debate of the project. He was an excellent mentor to the students whom we advised and although he is one of the top experts in the field of aeroacoustics, he was always very approachable and kind to students and co-workers alike.…”

Section: Penn State-the 2000smentioning

confidence: 99%

Philip J Morris: Some history and professional achievements

McLaughlin

Viswanathan

Morris

2018

International Journal of Aeroacoustics

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This introduction contains personal information and a summary of numerous technical achievements of Professor Philip J. Morris, an incredibly talented aeroacoustician and a true gentleman. Phil's daughter Karen Morris, with the help of her mother Bing Morris, provided the history of Phil's family and early education. The lead author has been an active research partner for over 30 years and the second author has been a continuing research partner for that long, including his time as Phil's PhD advisee. The technical contributions made during Phil's time in Toronto, Canada, and in Georgia and Pennsylvania, USA are sprinkled with personal information to round out his many accomplishments. We hope that this prosopography serves to enhance and contextualize this special journal volume compiled for Phil, an honor that is so richly deserved.

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“…Three-dimensional PE techniques 30,31 are perhaps the most efficient ways to accomplish the task of creating a pressure field numerically. In parallel internal waves applications, we can eliminate the dependence in the direction along the wave crests.…”

Section: Numerical Modelingmentioning

confidence: 99%

Three-dimensional coupled mode analysis of internal-wave acoustic ducts

Shmelev

Lynch

Lin

et al. 2014

The Journal of the Acoustical Society of America

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A fully three-dimensional coupled mode approach is used in this paper to describe the physics of low frequency acoustic signals propagating through a train of internal waves at an arbitrary azimuth. A three layer model of the shallow water waveguide is employed for studying the properties of normal modes and their coupled interaction due to the presence of nonlinear internal waves. Using a robust wave number integration technique for Fourier transform computation and a direct global matrix approach, an accurate three-dimensional coupled mode full field solution is obtained for the tonal signal propagation through straight and parallel internal waves. This approach provides accurate results for arbitrary azimuth and includes the effects of backscattering. This enables one to provide an azimuthal analysis of acoustic propagation and separate the effects of mode coupled transparent resonance, horizontal reflection and refraction, the horizontal Lloyd's mirror, horizontal ducting and anti-ducting, and horizontal tunneling and secondary ducting.

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A three dimensional parabolic equation method for sound propagation in moving inhomogeneous media

Cited by 14 publications

References 14 publications

Numerical Investigation of the Effect of Crosswind on Sound Propagation Outdoors

Numerical Investigation of the Effect of Crosswind on Sound Propagation Outdoors

Philip J Morris: Some history and professional achievements

Three-dimensional coupled mode analysis of internal-wave acoustic ducts

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