Accession Number : AD0283374

Title :   THE DYNAMIC PROBLEM OF TWO SHIPS OPERATING ON PARALLEL COURSES IN CLOSE PROXIMITY

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : PAULLING,J.R. ; WOOD,LLOYD W.

Report Date : 18 JUL 1962

Pagination or Media Count : 1

Abstract : The equations of rigid bod motion of two ships operating in close proximity on parallel courses are derived. The equations are assumed linear in terms representing small perturbations about an average steady motion. The two-ship problem is taken to be similar to the problem of steering of a single ship with two modifications: (1) all lateral force and moment derivatives for one ship must be evaluated with the second ship present and thus reflect the effect of the presence of the second ship, (2) there are additional forces and moments which depend on the relative positions of the two ships. These are expressed by derivatives with respect to the lateral and longitudinal separation distance. As a first step in t e complete investigation of the two-ship problem, the force and moment derivatives were obtained experimentally for a Mariner ship model using a lateral sinusoidal motion technique. The values so obtained are similar to those obtained by other investigators by other methods. (Author)

Descriptors :   *HYDRODYNAMICS, *MOTION, *PARTIAL DIFFERENTIAL EQUATIONS, *SHIPS

Distribution Statement : APPROVED FOR PUBLIC RELEASE