Numerical Analysis of Airframe Noise Scattering Effects in Tilt Rotor Systems

Casalino, Damiano; Genito, Mariano; Visingardi, Antonio

doi:10.2514/1.24605

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…Previous researches mainly focus on the theories of BEM method [18][19][20], and some basic verification cases of acoustic scattering effects with simple solid boundaries such as spheres and plains [21,22]. The research presented in this paper aims at the acoustic scattering effects of the acoustic noise produced by the helicopter rotor blades with the solid boundary of helicopter fuselage, and tries to discover the influence of the variety of the fuselage types and sizes.…”

Section: Scientific Articlementioning

confidence: 99%

Acoustic scattering effect prediction of helicopter fuselage based on BEM and convective FW–H equation

Wang

Huang

2022

Acta Acust.

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The main acoustic noise source of helicopters is supposed to be the rotor blades, but the scattering effect of the helicopter fuselage sometimes cannot be ignored. For the accuracy of acoustic noise prediction and the research on the scattering affections of the helicopter fuselage, an FWH–BEM Method (FBM) based on convective FW–H equation and boundary element method (BEM) is presented for the prediction of the noise scattering effects of helicopter fuselage and the approach to the calculation of a helicopter’s acoustic noise field. In this paper, different fuselage models are adopted for the comparisons of the acoustic noise scattered by different types of fuselages. According to the discovery that helicopter fuselages with sharp edges can bring more significant acoustic scattering effects, a research on the influence of radius of curvature (RC), which reflects the sharpness of fuselage sharp edges, is also carried out. In addition, the acoustic scattering effects of the same type of fuselage but with different length, width and height ratios are also compared for discovering the influences of the fuselage size. The presented FBM is efficient to analyze the acoustic scattering effects of the helicopter fuselage and predict the acoustic noise field, taking both the rotor and the fuselage into account. Besides, the research in this paper leads to the discovery of the influence factors of the acoustic scattering effects and helps the proper selection of the fuselage in a helicopter stealth design.

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Section: Scientific Articlementioning

confidence: 99%

Acoustic scattering effect prediction of helicopter fuselage based on BEM and convective FW–H equation

Wang

Huang

2022

Acta Acust.

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“…The aerodynamic simulations were carried out by using the medium-fidelity code RAMSYS [5], which is an unsteady, inviscid, and incompressible free-wake vortex lattice boundary element methodology (BEM) solver for multi-rotor, multi-body configurations developed at CIRA and validated in several works [6][7][8]. It is based on Morino's boundary integral formulation [9], for the solution of Laplace's equation for the velocity potential ϕ.…”

Section: The Numerical Solvers 21 Aerodynamic Solvermentioning

confidence: 99%

Acoustic Impact of Hybrid-Electric DEP Aircraft Configuration at Airport Level

Sollazzo¹,

Petrosino²,

Vivo³

et al. 2021

Applied Sciences

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The Italian research project PROSIB (PROpulsione e Sistemi IBridi per velivoli ad ala fissa e rotante), is a 30-month initiative funded by the Italian Ministry of University and Scientific Research (MIUR) and coordinated by the Leonardo company. The project is aimed to investigate configurations for regional aircraft and rotary wing platforms and architectures for propulsion systems, and is dedicated to the identification of the best strategy for their use, given different on-board energy sources. The reduced environmental impact is the key for the success of the new hybrid/electric aircraft configurations. This not only considers the chemical pollution introduced in the atmosphere, but also the noise produced on the surrounding area of airports. The present paper describes the acoustic impact assessment resulting from the inclusion of new propulsion technologies and new configurations of regional aircraft (ATR42 pax) in a reference airport area.

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CEAS-ASC highlights 2006

Caro

2007

Journal of Sound and Vibration

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Numerical Analysis of Airframe Noise Scattering Effects in Tilt Rotor Systems

Cited by 10 publications

References 16 publications

Acoustic scattering effect prediction of helicopter fuselage based on BEM and convective FW–H equation

Acoustic scattering effect prediction of helicopter fuselage based on BEM and convective FW–H equation

Acoustic Impact of Hybrid-Electric DEP Aircraft Configuration at Airport Level

CEAS-ASC highlights 2006

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