When a submarine moves near the free surface, lift and drag characteristics that act on it are different compared to when in deep water; for example, waves surface cause motions not seen water conditions lead changes speed, fuel efficiency, safety, maneuverability. To accurately predict maneuverability of submarine, is necessary consider how both maneuvering seakeeping performance affected by free-surface effects during design stage. In this study, unified dynamic model proposed. analysis,...

The hydrodynamic derivatives are necessary for assessing the dynamic characteristics, such as stability and maneuverability which crucial in evaluating navigation safety operational efficiency. Hence, it is required to compute precisely. This study nominates new empirical formulae predicting of a submarine. proposed derived from forces moments measured using Computational Fluid Dynamic (CFD) approach. Because BB2 generic submarine designed with an appropriate geometry outstanding features,...

Despite receiving much attention from researchers in the field of naval architecture and marine engineering since early stages modern shipbuilding, berthing phase is still one biggest challenges ship maneuvering due to potential risks involved. Many algorithms have been proposed solve this problem. This paper proposes a new approach with path-planning algorithm for automatic tasks using deep reinforcement learning (RL) based on simulation. Unlike conventional control theory or an advanced...

The presence of twin hulls a catamaran has strong impact on wave pattern in the whole inner region due to interference between waves generated by each demi-hull. Consequently, profiles as well height become complicated and unpredictable not only still water, but also waves. Determining characteristics demi-hulls is essential for predicting operation an autonomous underwater vehicle (AUV) throughout launch recovery (LAR) process. This study performed experiment investigate under regular...

Ship maneuvering in restricted waters is a significant challenge navigation safety due to the complex flow around ship. In particular, when ship travels close lateral bank and shallow water, hydrodynamic interaction forces significantly influence motion of Maneuverability water even more difficult for an autonomous surface Therefore, it necessary assess effects near this study, simulations considering effect at various depths are implemented based on estimated using computational fluid...

To reach a port, ship must pass through shallow water zone where seabed effects alter the hydrodynamics acting on ship. This study examined maneuvering characteristics of an autonomous surface at 3-DOF (Degree freedom) motion in deep and based in-port speed 1.54 m/s. The CFD (Computational fluid dynamics) method was used as specialized tool naval RANS (Reynolds-averaged Navier-Stoke) solver for prediction. A virtual captive model test with various constrained motions, such static drift,...

Among the 6 degrees of freedom (6-DoF), excessive roll motion is most dangerous cause ships capsizing. However, when analyzing maneuverability surface ships, components have usually been ignored. It widely known that influence moment becomes significant for with low GM (metacentric height) and high speed. This paper examines pure test several to assess roll-related hydrodynamic derivatives added mass damping in maneuvering. The objective are KRISO Container Ship (KCS), David Taylor Model...

The presence of the twin hulls catamaran has a strong impact on wave pattern in whole inner region due to interference between waves generated by each demi-hulls. Determining characteristics demi-hulls catamran is essential for predicting operation an AUV throughout launch and recovery process. This study performs experiment investigate under regular irregular at various directions speeds. designed order measure elevation using ultrasonic sensors capacitance probes. measured then analyzed ....

Roll moment usually is ignored when analyzing the maneuverability of surface ships. However, it well known that influence roll on significant for ships with small metacentric height such as container ships, passenger etc. In this study, a pure test performed to determine hydrodynamic derivatives respect motion added mass and damping. The target ship an autonomous designed carry containers drift large freeboard. commercial code STAR CCM+ software applied specialized tool in naval based RANS...