Biological fouling is undesirable accumulation of various organisms on submerged artificial surfaces. Combating biological fouling on watercrafts and immersed infrastructures is an eternal pursuit since ancient times. Traditionally, toxins, such as arsenic, mercury and tributyltin, were used as antifoulants on ship hulls but they are very harmful to both human and environment. Therefore, worldwide

A simulation verification of the hybrid propulsion ship considering accurate electro-dynamic model is required to evaluate ship maneuverability before the maritime demonstration. This paper presents the simplified model constructions for the hybrid propulsion ship using a real time simulator in terms of the dynamic models accuracy and the improvement of a computation speed. In addition, the hardware

This paper presents an analysis of the effects of heave plates with large skirts on the dynamics of a semi-submersible FOWT in waves. The analysis was based on a preliminary hull configuration envisaged for Brazilian waters. A numerical model based on linear frequency-domain hydrodynamics evaluated with panel methods was used for predicting the effects of the heave plates on the natural periods of

A numerical method for solving 3D unsteady potential flow problem of ship advancing in waves was put forward. The flow field was divided into an inner and an outer domain by introducing an artificial matching surface. The inner domain was surrounded by a ship-wetted surface and a matching surface as well as part of the free surface. The free-surface condition for the inner domain was formulated by

A new control method for autonomous underwater vehicle (AUV) is developed to achieve three-dimensional (3D) path following under ocean current disturbances when AUV lacks lateral and vertical driving forces. To make the control system more convenient for practical application and reduce the energy consumption of AUV, the controller is designed with relative velocities. To avoid the singularity problem

Autonomous navigation on the open sea involving automatic collision avoidance and route planning helps to ensure navigational safety. To judge whether all target ships (TSs) will pass safely and find the optimal route under multi-ship encounter situations, the relationship between the variations in the own ship (OS) velocity vector after nonlinear course altering motion and the collision avoidance

An integral equation method is developed to study the wave interaction with two symmetric permeable plates submerged in a two-layer fluid. The plates are inclined and penetrate the common interface between the layers. The existence of two different wave modes for the incident wave gives rise to two problems. Both of these are tackled by reducing them to a set of coupled hypersingular integral equations

Broaching-to, an uncontrollable maneuvering problem that may occur in following and quartering seas, can induce large roll motion and sometimes capsizing due to violent yaw motions, e.g., Nicholson (Some Parametric Model Experiment to Investigate Broaching-to, pp 160–166, 1974). Broaching-to arises when a ship cannot maintain its desired course even under maximum steering effort. Previous experiments

For damping the rolling motion of ship effectively and economically in rough sea, nonlinear feedback algorithm is implemented to control the fin stabilizer. Most of the researches paid attention to improve the performance of controller, while this paper turns attention to control the feedback error by a nonlinear function to reduce energy consumption. The controller and feedback error decorating constitutes

The research in underwater communication system is focused towards wireless networks in view of recent developments in wireless technology and increasing need for deep sea data mining. The underwater wireless optical communication (UWOC) have more advantages for short-range wireless links due to very high bandwidth and data rate than acoustic communication. Although UWOC offers high capacity links

This study develops a numerical simulation-based optimization procedure of Small Waterplane Area Twin Hull (SWATH) design. The procedure integrates the parametric geometry model, numerical analysis of total resistance, response surface methodology (RSM) model, and evolutionary optimization (EVOL) algorithm. The parametric hull form model is constructed based on general characteristic curves and several

In the present paper, the computational fluid dynamics (CFD) method is used to investigate the variation of linear and nonlinear wave loads on a 10-MW large-scale monopile offshore wind turbine under typical sea conditions in the eastern seas of China. The effect of adding a structural ice-breaking cone configuration close to the mean water level on the monopile’s hydrodynamic response is studied further

The hydrodynamic performance and lift-drag ratio of the underwater glider affected the state of its own operation. Therefore, a three-dimensional physical model and a mathematical model of a certain type of underwater glider are established. According to the principles of aircraft performance characterization, the fluid dynamics method was used to simulate the pressure distribution of the underwater

A numerical study of roughness effects at an actual ship scale is performed. Low-Reynolds number roughness models based on the two-equation turbulence model are employed, meanwhile, a wall function method is also developed. First, the roughness models are examined for the 2D flat plate case at the Reynolds numbers of \(1.0 \times 10^7\), \(1.0 \times 10^8\) and \(1.0\times 10^9.\) The resistance coefficient

Ship hull paint roughness considerably affects ship’s resistance. During the ship design stage, the added resistance coefficient, ΔCF, is used as the parameter of added resistance due to roughness. ΔCF is commonly estimated by the ITTC1978 formula using Ks as the roughness parameter. Ks is measured as the average hull roughness (AHR). AHR is composed of the average of Pt50 values (difference between

With the development of offshore oil production and the resulting application of riser pipes, it is necessary to get a better understanding of the flow-induced vibrations (FIV) phenomenon involving multiple cylindrical structures. In this scenario, little is available concerning the phase difference between the transverse displacements of two long rigid cylinders (aspect ratio of 30) in tandem and

In this study, to satisfy the urgent demand of vessel transportation marine service that are more standardized and intelligent, the vessel intelligent transportation maritime service portfolios in port areas (VITMSPPA) under e-navigation framework are proposed. First, we analyzed the qualitative description of vessel transportation maritime services in the maritime service portfolios. Thereafter, by

With an extreme load condition, the mooring system of a floating offshore wind turbine (FOWT) will be led to failure, such as mooring line breakage. However, the induced FOWT mooring line breakage in extreme gust still requires further study for design optimization in the future. In this paper, an aero-hydro-cable-servo time domain coupled simulation have been carried out of a NREL’s 5 MW OC4-DeepCwind

Accurate calculation of restoring moment, virtual mass moment of inertia and damping moment increases the accuracy of a ship’s dynamic stability simulation. The current methods of approximating the roll restoring moment are based on hydrostatic calculations. These methods fail to consider the dynamic conditions and variation of upward buoyancy and wave location with respect to the model. In the current

Autonomous Underwater Helicopter (AUH) is a novel dish-shaped multi-functional submersible vehicle in the autonomous underwater vehicle (AUV) family. Numerical study of launch and recovery system for AUVs from a research vessel is significant in the overall design. Single-arm crane and air-launch way are the important ways of launching AUVs with the high expertise and security. However, AUVs are still

This paper presents a method to efficiently calculate steady sailing conditions such as check helm, speed drop, hull drift angle, etc. of a ship moving in parallel to a bank wall under steady wind, together with the course stability at the equilibrium condition. Using this method, this study investigates the bank effect on the steady sailing condition and the course stability of a pure car carrier

A spring mounted rotating cylinder placed in flow is investigated using a two-dimensional newly improved discrete vortex method at Reynolds number of 105. In this study, the non-dimensional rotation rate, \(\alpha\) (rate of the cylinder surface velocity and flow velocity), varies from 0 to 16, and the reduced velocity \({\text{Ur}}\), increases from 1 to 14. The relationship between the wake formation

Planing crafts encounter large accelerations and motions when operated at high speeds in a seaway. To enhance their design and operability, accurate prediction of the accelerations and motions which these crafts will exhibit in a seaway is necessary. Here, validation and testing of a computational model for motion assessment of a planing craft in a seaway (MAPCS) are presented. To the best of the author’s

This study presents the experimental analysis of an innovative floatover installation method with the rapid transfer technique, in which the topside loads can be transferred fast and safely. In the rapid transfer process, 30% loads were firstly transferred onto the jackets within only 1 min using the jacking system. Then both the ballast system and the jacking system were employed to gradually transfer

To decrease the complexity of experimental setup that often results in low reliability of the experimental results for typical offshore floating structures with increasingly excessive mooring lines, a mooring line number simplification methodology is proposed based on equivalent of the vessel/mooring coupled dynamics for vessel with original and simplified mooring systems. The Non-dominated Sorting

In this study, for efficient safety assessment of a ship’s hull girder subjected to a combination of the global vertical bending moment (VBM) and the local double-bottom bending moment (DBM), a numerical method based on a coupled computational fluid dynamics (CFD) and finite-element analysis (FEA) is first developed. The mutual two-way coupled CFD and FEA in which the elastic deformation of the ship

In this paper, a method for predicting the extreme value distribution of the vertical bending moment (VBM) in a ship under a given short-term sea state is presented. To predict the extreme value distribution of the VBM, the first-order reliability method (FORM), by which the most probable wave episodes (MPWEs) leading to given VBMs are identified, is introduced. The coupled computational fluid dynamics

The hydrodynamic problems of water entry of a wedge are investigated by a modified ghost-cell immersed boundary method. The modifications correspond to a newly proposed scheme for dealing with fluid–body interaction, and incorporation of CIP (Constraint Interpolation Profile) method and THINC/SW (Tangent of Hyperbola for Interface Capturing with Slope Weighting) method. The modified ghost-cell immersed

An end plate propeller (ENDP) shaped by a diffused endplate bent to the pressure side is proposed in the paper. The ENDP differs from a contracted and loaded tip (CLT) propeller, and possess remarkable performance in terms of cavitation, efficiency, vibration, and noise comparing with that of CLT and conventional propeller, particularly operating at inclined shaft condition. According to experiments

A bidirectional fluid–structure coupling method was developed to comprehensively understand the VIV characteristics of a 3D flexible marine riser. Through study VIV characteristics of the 3D riser in different flow conditions and by analysis of the structural characteristics of the riser’s responses, this study successfully captured the phenomena of switching of adjacent-order vibration modes and the

To analyze the influence of duct geometrical parameters on hydrodynamic performance of pump jet propulsor, this paper presents a surface panel method for predicting performance of pump jet propulsor. And, moreover, a meshing method for blade, based on circular conical surface, is proposed. According to the actual situation of the internal flow of the pump jet propulsor, a tip leakage vortex model for

This paper investigates the effect of waves and ocean currents on the dynamics and motion control of underwater gliders. Waves and ocean currents affect a glider’s performance by deviating from its desired path and reducing its operational range. The influence of wave disturbances and ocean currents is estimated using mathematical models for sea state, potential flow theory and linear wave theory.

There is a possibility that accidents of oil tankers cause human loss and/or marine environmental pollution. Therefore, it is important to examine safety measures to prevent the accidents or to reduce subsequent damages. “Risk” is an index to quantitatively evaluate the effectiveness of such measures. One of the methods to express the risk is F–T (frequency vs. tons of spilt oil) curve. Some approximation

In recently constructed vessels, minimization of engine room volume is required to maximize the volume of cargo to be shipped. Therefore, the main engine and the stern bulkhead mounted on the ship are installed as far as possible in the aftward direction. As a result, the length of the propeller shaft is reduced, along with the stern tube bearing span used to support it. In this case, the shaft flexibility

Liquefaction of granular bulk cargo could result in cargo movement and loss of stability of ships, causing the loss of many lives in marine casualties in recent years. To ensure shipping safety, experimental tests and numerical methods have been adopted to reveal the coupled mechanism between liquefied cargo movement and ship motions. In the present study, a numerical model based on a CFD solver and

The degradation process of adhesive bonding layers on ship exposure decks was examined via an exposure test using adhesive bonding joint specimens under tensile shear load. The degradation was evaluated by the delamination and the deformation of the adhesive layer. The degradation initiated in summer, which was more significant for the specimens located at exposed areas of the ship than those in the

A vortex-induced vibration (VIV) is a typical flow-structure interference phenomenon that causes an unsteady flow pattern owing to vortex shedding at or near the structure’s natural frequency, leading to resonant vibrations. VIVs can cause the failure of marine risers owing to premature fatigue, because of which a growing amount of research has attended to them. To investigate the effects of suppressing

In response to an increased reliance on bigger, Neopanamax-sized vessels for shipping, the Panama Canal has been expanded. Whilst the way that vessels transit the newly expanded canal has stayed the same, maneuvering operations have changed. As a result, transit times have been affected. In accordance with the size and cargo of vessels, canal navigation rules restrict how access channels (Culebra Cut

In the current study, the environmental performance of the first full-scale combined low-pressure exhaust gas recirculation (EGR) and seawater scrubbing system was investigated thoroughly onboard an LPG carrier operated on high-sulfur HFO. Results clearly show that the chosen approach allows around 70% \(\hbox {NO}_x\) reduction and simultaneous elimination (98% reduction) of \(\hbox {SO}_x\) emissions

The optimisation of load shares between parallel power sources is essential for fuel-efficient propulsion systems. A more complete power management problem can be formulated by including the propeller and its propulsion control. Not only does this allow for a reduction in the propeller load under the changing operating conditions of the vessel, but also it enables the minimisation of the machinery’s

Plate forming is an essential procedure in shipbuilding, which will influence the dimensional accuracy and fabrication schedule. Due to the advantages of induction heating for plate forming such as precision controlling, high level of automation, an experimental investigation for plate forming with multiple linear induction heating was carried out at first. With advanced 25 kW induction heating equipment

This paper investigates the nonlinear hydroelastic motion and load responses on a large flexible ship advancing in harsh irregular waves. A 3D time-domain nonlinear hydroelasticity theory for the prediction of ship motions, deformations and wave loads in long-crested irregular waves is presented. The nonlinear Froude–Krylov force and hydrostatic restoring force are calculated on the instantaneous wetted

Simplified models of multilayered unbonded flexible pipes for offshore applications were manufactured and put to a series of bending tests where biaxial bending strains of tensile armor wires were directly measured. Focusing on the effects of constraint on the tensile armor wires by outer layers on the bending stiffness of the pipe and the bending stresses of tensile armor wires, four types of pipe

During hull construction, solar radiation in summer is one of the major factors hindering productivity because it induces unnecessary correction work due to the excessive out-of-plane distortion on the decks exposed to the Sun. Therefore, it is crucial to establish rational criteria for correction works in consideration of the transitional behavior of out-of-plane distortion by solar radiation. The

To realize autonomous ships in the near future, possibility of automatic berthing has been investigated. Automatic berthing is not an easy task because of some complexities that are included in the problem, such as the nonlinearity of the low-speed maneuvering model, danger of collision with berth, etc. In this research, as a first step, the authors solved the off-line automatic berthing problem. Here

The paper presents a methodology to design an electric controller for marine cycloidal propeller. The controller is designed considering the torque and the rotational speed limit of the motor. The influence of manoeuvring dynamics of the ship, rotational speed of the disc, eccentricity ratios and torque, pitching speed and pitch angle of the blades on the controller design are investigated. Feedback