Abstract
This paper briefly discusses the state-of-the-art of combustion stability analysis of solid propellant rocket motors and the fact that an accurate, unperturbed, acoustical frequency-modal analysis is an initial requirement in the stability analysis. The formulation of a general three-dimensional finite-element structural vibration analysis model is presented in condensed fashion and it is shown how this formulation can be simply modified to yield a fluid vibration analysis model. The resulting model is applied to a simple example problem for the purpose of demonstrating the feasibility of utilizing an existing structural analysis code for a direct threedimensional acoustic analysis.
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