ESTIMATION OF BALLISTIC PARAMETERS OF GUN PROPELLANTS THROUGH CLOSED VESSEL EXPERIMENT MODELING

Abstract

Closed vessels have being used for the regression of lumped ballistic
parameters for decades. However, if material and energy balances are
coupled with burning rate empirical correlations, several uncorrelated
parameters can be estimated, which describe more accurately the
thermochemical behavior of the gases generated, even if the chemical
composition of the propellant is unknown (as when the propellant is
aged, for instance). This research presents such approach leading to a
system of differential equations which are integrated to produce a
theoretical pressure profile in the vessel, highly dependent on the choice
of empirical parameters. Such parameters are manipulated according to
the Maximum Likelihood statistical procedure, which leads to the best
set of parameters to describe the propellant.