EFFECTS OF AERODYNAMIC COEFFICIENT UNCERTAINTIES ON TRAJECTORY SIMULATION OF A SHORT-RANGE SOLID PROPELLANT FREE ROCKET

摘要

Effects of aerodynamic coefficient uncertainties on trajectory simulationwere investigated for a short-range solid propellant free rocket.Aerodynamic and physical data were obtained from published experimentaldata and used as nominal values. A 6-DOF rigid body model was employedto simulation rocket trajectory. The output parameters evaluated in thisstudy were maximum acceleration, spin rate, total angle of attack, andimpact point. The effect of individual aerodynamic coefficient wasevaluated by performing trajectory simulation with variation in eachcoefficient then observed change in the output parameters. The coefficientsthat significantly affect the output parameters were indentified. In addition,a Monte Carlo analysis was performed to assess the effects of uncertaintiesin multiple coefficients. Totally, 4000 trajectory simulation runs werecarried out and distributions of the output parameters were presented.