Study on Data Analysis of On-Board Measurement Data for Ship’s Speed Power Performance

Present paper deal with data analysis of on-board measurement data from operating ship. The main purpose of the study is estimating speed-power performance of target ship which are in service now. Various kinds of on-board measured data are considered such as ship speed, engine RPM, brake power, draught, rudder angle, etc. Also, in order to estimate the added resistance, weather forecast data about wind, wave and current was considered. What this study found was that the onboard measurement data and weather forecast data have a lot of uncertainty, so the data need to be post-processed in order to derive reliable speed power performance curve. For this reason, current study proposed three-step filtering procedure. The filtering schemes are based on 1) absolute threshold value, 2) moving window, 3) derivative threshold value. The paper compared the performance estimation results of ship with and without filtering technique and some conclusions could be drawn.