Abstract
The added moment of inertia about z axis of ship are very important to analyze hydrodynamic forces and also simulate maneuvering motion of ships. The added moment of inertia based on the experiments by Motora is well-known owing to its practicability for the ship design. In recent years, floating structures with C_B nearly equal 1 has been used by operation in ocean exploitaion. But Motora's charts without C_B nearly equal 1 is not enough to use for floating structures. The purpose of this paper is to present a quick chart arranged with a new parameter in order to estimate the added moment of inertia of floating structures with C_B=1. The added moment of inertia of floating structures with C_B=1 is obtained by the constant angular acceleration test and calculation of potential flow.
