The Effect of Different Ship Sailing Attitude on Seakeeping Performance

Abstract

This research aims at figuring out the effect of different draft and trim angle of the ships on seakeeping performance by well-developed computer simulation program for ship hydrodynamics In the research three different types of ships are to be compared They are tanker ship container ship and bulk carrier ship (series 60) which all have different value of block coefficient (CB) The existing computer program based on strip theory is applied to calculate the ship motions and added resistance Experimental tests are carried out to verify the results from the computer program However the tests only include longitudinal waves conditions due to the limitation of the facilities in NCKU Towing Tank The experimental test also includes the measurement of moment of inertia for pitch motion of whole ship model From the results we found that for container ship sailing attitudes with trim by stern show good performance in heave motion pitch motion and added resistance generally However for roll motion trim by bow 1° status shows the best performance For tanker ship sailing attitudes with trim by stern also show good performance in heave motion pitch motion and added resistance generally However for roll motion even keel status shows the best performance For series 60 ship sailing attitude with trim by stern also has good performance in heave motion pitch motion and added resistance However trim by stern status has the worst performance in roll motion among all the sailing attitudes Generally speaking for series 60 ship there is no best sailing attitude adapted to all conditions because each sailing attitude has different advantages and drawbacks of seakeeping performance

Date of Award	2015 Aug 26
Original language	English
Supervisor	Ming-Chung Fang (Supervisor)