Analysis of the Effects of Finite Impedance Ground and Atmospheric Turbulence on Launch Vehicle Noise Measurements

Abstract

A theoretical model for the ground reflection from a correlated, extended source and including atmospheric turbulence [K. L. Gee et al., Proc. Mtgs. Acoust. 22, 040001 (2014)] is used to correct spectra measured over snow-covered terrain during a horizontal solid rocket motor firing. A sensitivity analysis reveals that at moderate distances, the relative sound pressure level changes are more sensitive to ground effective flow resistivity and microphone height, whereas at long range, the turbulence parameters and ground impedance have greater impact.