Full-Scale Maneuvering Trials Correction and Motion Modelling Based on Actual Sea and Weather Conditions

Bin Mei,Licheng Sun,Guoyou Shi

doi:10.3390/s20143963

Abstract

Aiming at the poor accuracy and difficult verification of maneuver modeling induced by the wind, waves and sea surface currents in the actual sea, a novel sea trials correction method for ship maneuvering is proposed. The wind and wave drift forces are calculated according to the measurement data. Based on the steady turning hypothesis and pattern search algorithm, the adjustment parameters of wind, wave and sea surface currents were solved, the drift distances and drift velocities of wind, waves and sea surface currents were calculated and the track and velocity data of the experiment were corrected. The hydrodynamic coefficients were identified by the test data and the ship maneuvering motion model was established. The results show that the corrected data were more accurate than log data, the hydrodynamic coefficients can be completely identified, the prediction accuracy of the advance and tactical diameters were 93% and 97% and the prediction of the maneuvering model was accurate. Numerical cases verify the correction method and full-scale maneuvering model. The turning circle advance and tactical diameter satisfy the standards of the ship maneuverability of International Maritime Organization (IMO).

Highlights

During sea trial, ship motions include maneuvering and drifting
In order to obtain accurate trial data, the correction of this is an important step for ship maneuvering modeling
Kim et al [5] employed the method seen in the literature [6,7,8] to correct the sea trial data and identified the ship maneuvering model, but did not consider the influences of wind and waves

Summary

Introduction

Drift motion is caused by the wind and waves at sea, and the ship shows slow, long periods of movement and even steady movement [1]. Dating back to 1978, Abkowitz utilized Esso Osaka for sea trials, identified the ship maneuvering mathematical model and verified the feasibility of the identification modeling method [2]. Zhang et al [3], Bai et al [4] and Kim et al [5] used full-scale ship data for identification modeling. Kim et al [5] employed the method seen in the literature [6,7,8] to correct the sea trial data and identified the ship maneuvering model, but did not consider the influences of wind and waves. Using trial data to establish a model, one should choose the small-influence trials; otherwise, the influences of wind and waves need to be eliminated

Methods

Results

Discussion

Conclusion