Ship Trim Optimization-Assessment of Influence of Trim on Ship Frictional Resistance

摘要

Environmental issues and rising fuel costs necessitate better energy-efficiency in all sectors. Shipping industry is a stakeholder in environmental issues and global economy. Trim optimization is an effective way to enhance energy-efficiency in shipping industry. Trim optimization principles are based on the fact that ship experiences different (more or less) resistance through water for same speed and draft depending on its trim. Trim optimization simply suggests selecting the trim condition for minimum resistance. Less resistance implies less fuel consumed and less emissions. The purpose of this paper is to evaluate the influence of trim on frictional resistance. The paper includes calculations, results and discussion on the influence of trim on frictional resistance of various standard hullforms. The author will also comment on future scope of ship trim optimization work in terms of including wave-making resistance, air resistance, additional resistance due to surface-waves and integrating real-time marine environment constraints.