Comparison of rocket launch data to empirical models for overall level and peak directivity angle

Abstract

With increasing frequency in global rocket launches, it is important to assess the effects of liftoff noise. Understanding of the fundamental physics of the sound radiation from rocket exhaust plumes remains limited. Some empirical predictive models, derived from plume parameters, cover aspects of the sound radiation, such as convective Mach number, peak directivity angle, and overall sound pressure level in the direction of maximum emission. These are evaluated using high-fidelity noise data from a number of different launches from Vandenberg Space Force Base. Initial results of the model comparisons will be presented.