Abstract
In recent years, it has become important to evaluate whether ship propulsive performance achieves the design performance not only in a calm sea condition but also in a seaway. Various on-board monitoring systems have been developed and fitted on-board to check the performance of ships in a seaway. The evaluation can also be fed back to a new ship design. A method for prediction of ship performance in actual seas based on a physical model is described here. Prediction of steady forces in waves, wind forces, drift forces, and steering forces is described from the viewpoint of accurate practical prediction. The prediction of the engine operating point in winds and waves is also treated here. Examples of these prediction methods are illustrated. Performance analysis by an on-board monitoring system using the performance prediction method discussed here is described in the Part 2 of this paper.
Highlights
To reduce the greenhouse gas emissions and fuel consumption of ships, improvement of the hull form and the power plant system has been strongly demanded
It has become more important to confirm whether propulsive performance achieves the designed performance in a calm sea condition, and in a seaway
Added resistance in waves is calculated by the component of the radiation effect, diffraction effect, and wave reflection, which are related to the hull form above water
Summary
To reduce the greenhouse gas emissions and fuel consumption of ships, improvement of the hull form and the power plant system has been strongly demanded For this reason, it has become more important to confirm whether propulsive performance achieves the designed performance in a calm sea condition, and in a seaway. Many experiments and theoretical studies have been carried out so far in connection with ship performance in the mild weather condition This performance is called ship performance in actual seas in the narrow sense, and is distinguished from ship performance in the heavy weather condition [6], where seakeeping performance will take precedence over propulsive performance. Instead of the abstract logbook, an on-board monitoring system has been developed and diffused recently Using this system, it is possible to make comparisons between the estimated performance and measured data in various situations. Propulsive performance in actual seas by the prediction method and by monitoring data is compared and discussed
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