الفهرس 
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Abstract
Due to the significance of a ship’s damage stability characteristics following a collision accident, as well as the fact that the International Maritime Organization (IMO) only took into account the presence of openings on the outer shell while ignoring the impact of the opening size on the resilience of the struck ship after impact. Then, this thesis proposes a multi-objective optimization procedure for the double-hull tanker’s side structure conventional design to create a set of design alternatives with reduced openings and reduced steel weight. The purpose of the suggested optimization method is to demonstrate how the size of the opening affected the survival of the ships following a collision. For the reliability of the thesis existing conventional design are utilized and its results are compared with the design alternatives from the optimization process. Hence, the parametric model is constructed using the ANSYS APDL programming language. Before running the collision simulation, the design alternatives in the optimization process are statically analyzed and verified. In the process of optimization, LS-PREPOST pre-processing command file is developed to prepare the collision simulation conditions. LS-DYNA solver is utilized to perform the collision simulations in the optimization procedure. LS-PREPOST post-processing command file is developed for the image processing procedure. Image processing procedure tool IMAGEJ is employed to measure the area of the openings after the collision in square meters. The optimization process is carried out using a multi-objective particle swarm optimization algorithm (MOPSO). Simplified flooding rate estimations are presented to estimate the flooding rate of the water inside the ship due to the openings for each optimized design alternative and the conventional design. Finally, a comparison of the optimized design alternatives and the conventional design flooding rates to validate the demand of considering the effect of the opening size in the design phase.