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Author Greenwood, Eric, II
Title Fundamental Rotorcraft Acoustic Modeling from Experiments (FRAME)
book jacket
Descript 223 p
Note Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5417
Advisers: Fredric H. Schmitz; James E. Hubbard
Thesis (Ph.D.)--University of Maryland, College Park, 2011
A new methodology is developed for the construction of helicopter source noise models for use in mission planning tools from experimental measurements of helicopter external noise radiation. The models are constructed by employing a parameter identification method to an assumed analytical model of the rotor harmonic noise sources. This new method allows for the identification of individual rotor harmonic noise sources and allows them to be characterized in terms of their individual non-dimensional governing parameters. The method is applied to both wind tunnel measurements and ground noise measurements of two-bladed rotors. The method is shown to match the parametric trends of main rotor harmonic noise, allowing accurate estimates of the dominant rotorcraft noise sources to be made for operating conditions based on a small number of measurements taken at different operating conditions. The ability of this method to estimate changes in noise radiation due to changes in ambient conditions is also demonstrated
School code: 0117
Host Item Dissertation Abstracts International 72-09B
Subject Engineering, Aerospace
Physics, Acoustics
0538
0986
Alt Author University of Maryland, College Park. Aerospace Engineering
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