A Mathematical Introduction to Ship Maneuverability. The Second David W. Taylor Lectures September 1973,

摘要

The subject selected for these lectures concerns ship maneuverability. This is a field where theory occupies a much less important place than empiricism because of the complexity of the phenomena involved in the maneuvering of a ship. No complete theory yet exists, and one can presume that this will be so for many years. Two facts seem to be of great importance: One is that a turning ship experiences a system of hydrodynamic forces, one component of which is orthogonal to the velocity of her center of gravity. This component must be considered as a lift. But, in the classical theory of lifting surfaces, a lift appears only if free vortices are shed. It follows that the vortex theory should be the basic tool of the maneuverability theory. The second important fact is that the inertial forces of the fluid may depend not only on the motions of the body itself but also on the existing motion of the fluid when the maneuver occurs. This means that the maneuverability theory has to take into account not only the classical 'added masses' but also 'apparent added masses.'