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- W2321839331 abstract "Energy-based acoustical measurements are investigated in the context of more fully characterizing rocket noise source regions. Near-field measurements made on statically fired GEM-60 motors are described and the performance of two types of four-microphone tetrahedral probes is discussed. Vector intensity plots reveal the magnitude and directionality of the near-field sound radiation as a function of frequency, position, and time in the plume. HE development of the next-generation space flight vehicles has prompted renewed interest regarding source characterization and near-field propagation models of rocket noise. This source characterization is required to determine the vibroacoustic impact on flight hardware and structures in the vicinity of the launch pad. Brigham Young University has been involved in an effort to develop and validate an energy-based acoustic probe suitable for use in rocket fields, in particular the RS-68B engine to be used on the Ares V vehicle. Energy-based acoustical measurements require estimation of both the collocated acoustic pressure and the threedimensional particle velocity. From the pressure, a scalar, and the particle velocity vector, a number of energybased quantities can be calculated, including vector acoustic intensity, specific acoustic impedance, potential, kinetic, and total energy densities, and the Lagrangian density. Knowledge of one or more of these quantities may" @default.
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- W2321839331 date "2009-05-11" @default.
- W2321839331 modified "2023-10-18" @default.
- W2321839331 title "Energy-Based Acoustical Measurements of Rocket Noise" @default.
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- W2321839331 doi "https://doi.org/10.2514/6.2009-3165" @default.
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