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Vieira, A.E. (author)Today's globalized world depends on civil air transportation, which has been continuously growing over the last decades. Nevertheless, the sustainability of this expansion is a challenge due to environmental problems. Along with greenhouse gas emissions, noise represents a severe hazard for human health, and consequently, noise regulations limit...doctoral thesis 2021
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Vieira, A.E. (author), Snellen, M. (author), Simons, D.G. (author)The shielding of engine noise by the aircraft wings and fuselage can lead to a significant reduction on perceived noise on ground. Most research on noise shielding is focused on BlendedWing Body (BWB) configurations because of the large dimension of the fuselage. However, noise shielding is also considered relevant in conventional tube and...conference paper 2017
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Utyuzhnikov, S.V. (author), Ryaben'kii, V.S. (author), Turan, A.A. (author)The problem of active shielding and noise control is considered. In this problem one domain is shielded from the noise generated in another domain via an implementation of additional sound sources situated outside of the first domain. The general solution of the problem in a finite-difference formulation can be obtained using the difference...conference paper 2006
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Utyuzhnikov, S.V. (author), Ryanben'kii, V.S. (author), Turan, A.A. (author)The problem of active shielding and noise control is considered. In this problem one domain is shielded from the noise generated in another domain via an implementation of additional sound sources situated outside of the first domain. The general solution of the problem in a finite-difference formulation can be obtained using the difference...conference paper 2006
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Laan, J.N. (author)In this report the sound propagation in a hard-walled annular duct of finite length is investigated. The individual modal solutions so found are described. The main properties which are calculated in the present report, are the modal intensity and the modal far field directivity pattern. The modal intensity is determined by the rate of mode...report 1975
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Tiggelaar, J.J. (author)For a simplified airplane model in a uniform flow an estimation of the shielding effect of the wing for a single frequency point source of sound is made. The sound field is calculated using a Kirchhoff-type approximation for the boundary values of the field. Some indications concerning the validity of this approximation are mentioned. Results...report 1973