산적화물선 운항성능 분석을 위한 선속, 파고 및 풍속 자료의 유효성 분석
Validity analysis of speed, wave height, and wind speed for the operational performance of a bulk carrier
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초록
조선사 및 운항사의 선박 에너지효율에 대한 관심이 날로 증가하고 있으며, 실 해상을 운항하는 선박의 운항자료를 모니터링하여 선박의 운항성능을 추정하려는 노력을 하고 있다. 운항성능을 보다 정확하게 추정하기 위하여서는 선박의 대수속도, 해상상태에 대한 자료의 유효성이 검증되어야 한다. 본 연구에서는 현재 운항하고 있는 산적화물선의 운항자료를 취득하여 이중 속도, 파고, 바람자료의 유효성을 검토하였다. 속도는 GPS로 얻어진 대지속도와 대수속도계(Speed Log)에 의한 대수속도를 비교 검토하여 유효성을 알아보았으며, 해상상태에 대하여서는 기상예보자료와 파고레이더, 풍속풍향계의 자료를 비교 검토하였다. 결과로 현재 대상선에 탑재된 대수속도계의 유효성을 검증하였으며, 기상예보자료도 운항성능을 추정하는데 사용될 수 있을 정도의 신뢰성을 가지고 있다는 판단이 내려졌다. 취득 자료의 신뢰성을 바탕으로 표준상태의 선속-동력곡선을 일부 추정하여 본 결과 타당한 결과가 얻어졌으며, 현재 계속 축적되고 있는자료를 분석하여 운항선의 운항성능을 추정하는 방법에 대한 분석을 할 예정이다.
Abstract
There is a growing interest of ship builders and shipping companies in energy efficiency, and efforts to estimate ship performance are having been realized by monitoring the operational data. An estimation of higher accuracy requires the validation of the speed through water and the ocean weather. In this paper, the validity of speed, wave height, and wind speed were investigated using the obtained operational data of a sea-going bulk carrier. The SOG(speed over ground) from GPS(global positioning system) and STW(speed through water) from speed log were compared and analyzed. And the weather forecast( hindcast) and the data from wave radar and anemometer were compared and discussed. As a result, the validity of the speed log with which the subject ship was equipped was confirmed. The data from the weather forecast were sufficient for the estimation of the ship performance. After performing certain sample calculations of the speed-power curves, reasonable results were obtained. And it is expected to analyze the methodology for the estimating the standard speed-power curve using the operational data which are being currently filed for the subject ship.
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