Stopping Abilities of Ships Equipped with Controllable Pitch Propeller : 3rd Report

Abstract

This report mainly describes the 4-quadrant characteristics of the controllable pitch propeller. Using three kinds of models of controllable pitch propellers for high speed container ship, high speed reefer and large ore carrier, we have carried out the 4-quadrant open test at Kawasaki's circulating water channel. From polynominal regression analysis using 0.7R pitch ratio, these open characteristics can be expressed with sufficient accuracy as follows: K_t, K_q = Σ__iΣ__kC_<ik>P^iJ^k Only by this regression formula, the open characteristics can be expressed irrespective of various original pitch and area ratios. In regard to stopping ability, we have solved equations of ship motion by using the characteristics obtained from the above formula and made simulation analysis, and studied effect of C.P.P. pitch angle speed, effect of F.P.P. revolution changing time, and effect of C.P.P. pitch changing pattern for the case of Ship No.1120.