The analysis of dispersion for trajectories of fire-extinguishing rocket

Scientific paper. Recent advances in fluid mechanics and heat & mass transfer. 2009. – 6 p.In this study a dispersion analysis has been completed on flight simulation software of an unguided fire-extinguishing rocket in order to predict the trajectory parameters and the trajectory dispersion, to analyze the probability of finding the impact point and also to determine the safety area which is a critical condition in firing fields’ tests. The total dispersion results mainly due to manufacturing inaccuracy, measurement errors which includes propellant mass, rocket total mass, axial and lateral moments of inertia and position of mass centre, thrust and fin misalignments, errors due to aerodynamic coefficients prediction and atmospheric modelling errors which include atmospheric disturbances such as fluctuations in wind profile, errors of atmospheric properties like pressure, density, temperature.