A study on sensitivity of maneuverability performance on the hydrodynamic coefficients for submerged bodies

Based on a constant-coefficient dynamic model, a study was made to determin e the influence of various hydrodynamic coefficients on the predicted maneu verability quality of submerged bodies. Two types of geometries were consid ered, a submarine and an axisymmetric slender geometry. For the submarine, the equations of motion used were the revised standard submarine equations (Feldman 1979) while for the latter geometry a dynamic model was developed. From computer simulation of a few selected definitive maneuvers based on t hese two different dynamic models for the two geometries, the sensitivity o f the simulated trajectory on changes in different coefficients was found. The results quantified in form of sensitivity values are presented. It is f ound that the typical measures from the maneuvers do not depend significant ly on most of the nonlinear coefficients. The coefficients having significa nt effects on the trajectories are found to be the linear damping coefficie nts for the submarine and the linear inertial force coefficients for the ax isymmetric body.