Straightline and Rotating Arm Captive-Model Experiments to Investigate the Stability and Control Characteristics of Submarines and Other Submerged Vehicles

摘要

The stability and control characteristics of submarines and other submerged vehicles can be determined by performing straightline and rotating arm captive-model experiments at the David Taylor Naval Ship R&D Center (DTNSRDC). From these experiments the hydrodynamic forces and moments are measured and the appropriate stability and control derivatives and hydrodynamic coefficients are determined. This information is used to evaluate the stability and control characteristics of the submarine, and to develop a mathematical model of the vehicle which is then employed in performing computer simulations of the motions of the vehicle. Vertical and horizontal plane Planar Motion Mechanism (PMM) experiments are performed in the straightline basin (usually Towing Carriage 2) to determine the static, and control derivatives, and the hydrodynamic force and moment coefficients associated with variations in angle of attack, angle of drift, and over and under propulsion. If the vehicle is symmetric (for example, a vehicle with a hull that is a body of revolution, fitted with four identical cruciform stern appendages), then only vertical plane experiments need to be performed. The hydrodynamic forces and moments are measured over a range of angles of attack (up to about 18 degrees) and sternplane angles in the vertical plane, and over a range of angles of drift and rudder angles in the horizontal plane.