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"NASA Technical Reports Server (NTRS) 20120008645: Broadband Noise Prediction When Turbulence Simulation Is Available - Derivation Of Formulation 2B And Its Statistical Analysis" and the language of the book is English.


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  • Title: ➤  NASA Technical Reports Server (NTRS) 20120008645: Broadband Noise Prediction When Turbulence Simulation Is Available - Derivation Of Formulation 2B And Its Statistical Analysis
  • Author: ➤  
  • Language: English

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We show that a simple modification of Formulation 1 of Farassat results in a new analytic expression that is highly suitable for broadband noise prediction when extensive turbulence simulation is available. This result satisfies all the stringent requirements, such as permitting the use of the exact geometry and kinematics of the moving body, that we have set as our goal in the derivation of useful acoustic formulas for the prediction of rotating blade and airframe noise. We also derive a simple analytic expression for the autocorrelation of the acoustic pressure that is valid in the near and far fields. Our analysis is based on the time integral of the acoustic pressure that can easily be obtained at any resolution for any observer time interval and digitally analyzed for broadband noise prediction. We have named this result as Formulation 2B of Farassat. One significant consequence of Formulation 2B is the derivation of the acoustic velocity potential for the thickness and loading terms of the Ffowcs Williams-Hawkings (FW-H) equation. This will greatly enhance the usefulness of the Fast Scattering Code (FSC) by providing a high fidelity boundary condition input for scattering predictions.

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