ABSTRACT:

A ship's abstract logbook contains lots of useful information on the navigation. In this study, ship's propulsive performance at sea was estimated by analyzing the abstract logbook data based on ISO15016 Guidelines for the assessment of power and speed performance using speed trial data. The analysis method was verified by comparing with the speed trial of an oil tanker. The performance analysis of a bulk carrier using the abstract logbook records on a voyage was carried out. The sea margin is estimated from the logbook data analyzing ship resistance increase.

INTRODUCTION

Nowadays, the technology which focus on environment and energy agenda has been developing. In maritime field, development of ship hull with less resistance, safe and efficient course selection are desired. Usually as of contract and design, ship performance in still water is used. While it is in actual sea that ship runs in service and as speed trial. In actual sea, sea condition such as waves, wind and current, and aging affect ship, so ship performance is decreased. Performance analysis means looking into the logbook data and calculation of the rate of decrease in ship performance due to added resistance in actual sea. This rate of performance decrease is called sea margin (SM). The systemization and upgrading of the analysis program will be able to improve the ship performance from broader perspective such as application to design of new ship and selection of proper course selection. In this study, we developed an analysis program which evaluates the ship performance in still water from logbook data and finally worked out sea margin based on ISO15016 Guidelines. Now, ISO15016 Guidelines indicated the method of calculation of ship performance in still water, clearing off the sea disturbances. We had solved the issues due to above, and analyzed actual navigation data.

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