A Model Testing Technique and Method of Analysis for the Prediction of Steering and Manoeuvring Qualities of Surface Vessels

摘要

A semi-theoretical method of investigating steering and manoeuvring qualities of surface-vessels is described. A general mathematical model, consisting of non-linear equations of motion for a body free to move in the horizon¬tal plane, is used as a basis. The hydrodynamic coefficients of the equations are obtained by carrying out captive-model experiments for each particular vessel, after which any desired manoeuvre can be predicted with the aid of a computer.nThe hydrodynamic coefficients are determined using a Planar-Motion Mechanism System to test 6 m. (20 ft.) wax models in a conventional towing tank. Details of the design, construction and use of this mechanism are given, together with a description of the methods used to analyse the mea-sured forces.