ABSTRACT

Oceanographic research vessels (ORVs) are used to collect ocean data and analyse them to understand the physical, chemical and biological characteristics of seawater, seabed and other ocean-related factors affecting climate changes. These task require vessel to track a predefined trajectory at different speeds. It is crucial to understand the effect of different speed on manoeuvring characteristics of the ship so as to assign appropriate control parameter and techniques to make its position/track keeping ability to an acceptable level. This paper attempts to estimate hydrodynamic derivatives of ORV by performing planar motion mechanism experiments at different speeds to understand the effect of Froude number on the hydrodynamic forces and subsequently on the different coefficient appearing in equations of motion and then on its turning performance. Sensitivity analysis is carried out as part of current work to understand the effect of different hydrodynamic derivative value variation on different turning parameter of vessel.

摘要

海洋学研究船（ORV）用于收集海洋数据并对其进行分析，以了解海水、海床和其他影响气候变化的海洋相关因素的物理、化学和生物特征。这些任务需要船舶以不同的速度跟踪预定义的轨迹。了解不同速度对船舶操纵特性的影响至关重要，以便分配适当的控制参数和技术，使其位置/航迹保持能力达到可接受的水平。本文试图通过在不同速度下进行平面运动机制实验来估计 ORV 的流体动力学导数，以了解弗劳德数对流体动力的影响，以及随后对运动方程中出现的不同系数及其转向性能的影响。