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Fundamental Rotorcraft Acoustic Modeling from Experiments (FRAME)

dc.contributor.advisorSchmitz, Fredric Hen_US
dc.contributor.advisorHubbard, James Een_US
dc.contributor.authorGreenwood, Ericen_US
dc.description.abstractA 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.en_US
dc.titleFundamental Rotorcraft Acoustic Modeling from Experiments (FRAME)en_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentAerospace Engineeringen_US
dc.subject.pqcontrolledAerospace Engineeringen_US
dc.subject.pquncontrolledacoustic flight testen_US
dc.subject.pquncontrolledhelicopter noiseen_US
dc.subject.pquncontrolledparameter identificationen_US
dc.subject.pquncontrolledrotor acousticsen_US
dc.subject.pquncontrolledsource noise modelingen_US

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