Prediction of Trajectories for an Underwater Missile
STEVENS INST OF TECH HOBOKEN NJ DAVIDSON LAB
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Nonlinear motion equations were used to predict vertical planar trajectories of the Basic Finner Missile observed previously in underwater model experiments at California Institute of Technology. Value of the hydrodynamic coefficients appearing in the motion equations were obtained from Basic Finner experiments made previously at CIT, Bureau of Standards, and Davidson Laboratory. Coefficients also were estimated on theoretical grounds. The observed trajectories could not be predicted using experimental coefficients alone. However, theoretical coefficients yielded pre dictions that agreed well with the observed motions. Computed trajectories were particularly sensitive to independent changes in the values of the hydrodynamic static and damping derivative coefficients. However, when these values were kept consistent with relations expressing their physical interdependence, they could be varied over fairly wide ranges without appreciably affecting the predictions.