Optimal ship tracking on a navigation route between two ports: a hydrodynamics approach
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Abstract
The optimal trajectory from Calcutta port to Mumbai port is charted for a tanker transshipping from the East coast to the West coast of India during rough weather. Rough weather is simulated over Indian seas using the state-of-the-art WAM numerical wave model (WAMDI Group in J Phys Oceanogr 18:1775–1810, 1988), assimilating satellite (IRS-P4) wind fields. These simulated wave fields and two-dimensional (2D) directional wave spectrum are an absolute representation of the irregular seaway. Hence, the same for the monsoon month of August 2000 formed the input basis for this study. Loss of ship speed due to the wave field (i.e., nonlinear motion of the tanker in waves) and associated sea-keeping characteristics in the seaway are estimated (Bhattacharya in Dynamics of marine vehicles, Wiley, New York, 1978). The approach adopted in this paper is unique in that it takes into account both voluntary and involuntary speed reductions of the ship. It helps in ship tracking by the optimum route using inverse velocity as the weight function for the path in an efficient way. Dijkstra’s algorithm [Numer Math 1(3):269–271, 1959] is applied in an iterative manner for determining the optimum track. The optimum track information has broad scope for use in modern shipping industry for obtaining safe and least-time routing by avoiding schedule delays with economic fuel consumption.
Keywords
Ship behavior Surface waves Ship routing WAM model OTSRNotes
Acknowledgments
The authors are thankful to Head, Department of Ocean Engineering and Naval Architecture, IIT, Kharagpur, India and Director, DHI-NTU Water & Environment Research Centre and Education Hub, Singapore, for extending support and encouragement for this work. This study is a collaboration of Ph.D. works of Dr. Chinmaya P. Padhy and Dr. Jitendra K. Panigrahi under the supervision of Prof. D. Sen and Dr. J. Swain, respectively.
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