Investigation of a Jet-Noise-Shielding Methodology
نویسندگان
چکیده
منابع مشابه
Prediction of Jet Noise Shielding
This study is motivated by the development of aircraft that use jet noise shielding by the airframe. Current methods to predict shielding from aircraft surfaces rely on formulae developed for diffraction of sound from omnidirectional point sources. However, the jet noise source is distributed and directional, thus requiring a different approach. In this study, the jet noise source is modeled as...
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Use of conventional scattering solvers for the problem of sound diffraction in the presence of a mean flow requires the use of variable transformations that reduce the wave equation to its canonical form. This enables the assessment of the mean-flow impact on the radiation of the isolated source as well as its diffraction by an object. Applications include the shielding of propulsion noise sour...
متن کاملActive Shielding and Control of Environmental Noise
We present a mathematical framework for the active control of time-harmonic acoustic disturbances. Unlike many existing methodologies, our approach provides for the exact volumetric cancellation of unwanted noise in a given predetermined region of space while leaving unaltered those components of the total acoustic field that are deemed as friendly. Our key finding is that for eliminating the u...
متن کاملInvestigation of a Single-Point Nonlinearity Indicator in the Propagation of High-Amplitude Jet Noise
There is evidence to suggest that nonlinearity is important in the propagation of highamplitude jet noise [Gee et al., AIAA J. 43(6), 1398-1401 (2005)]. Typically, the power spectral density (PSD) is used to assess the impact of jet noise on the surrounding environment, but such an assessment requires multiple measurement locations to observe the nonlinear evolution of the PSD. The difference i...
متن کاملActive Shielding and Control of Noise
We present a mathematical framework for the active control of time-harmonic acoustic disturbances. Unlike many existing methodologies, our approach provides for the exact volumetric cancellation of unwanted noise in a given predetermined region of space while leaving unaltered those components of the total acoustic field that are deemed friendly. Our key finding is that for eliminating the unwa...
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ژورنال
عنوان ژورنال: AIAA Journal
سال: 2015
ISSN: 0001-1452,1533-385X
DOI: 10.2514/1.j053837