Ship routing problems are a particular kind of routing problems where the vehicles to be routed are vessels or ships, usually in maritime environments. In contrast to land routing, ship routing has unique features, including overnight trips, disjoint time windows, not necessarily prespecified routes, and a great uncertainty derived from weather conditions. In this work we present a special ship...

Todays model-based dynamic positioning (DP) systems require that the ship and thruster dynamics are known with some accuracy in order to use linear quadratic optimal control theory. However, it is diicult to identify the mathematical model of a dynamically positioned (DP) ship since the ship is not persistently excited under DP. In addition the ship parameter estimation problem is nonlinear and...

The purpose of this paper is to clarify some important issues as regards ship speed optimization at the operational level and develop models that optimize ship speed for a spectrum of routing scenarios in a single ship setting. The paper’s main contribution is the incorporation of those fundamental parameters and other considerations that weigh heavily in a ship owner's or charterer's speed dec...

The sway velocity, which represents the interaction between sway, roll and yaw of ship, is not actually measurable. However, for effective control of the ship, this interaction also is to be taken into account. In this paper, we present a kalman filter approach for the estimation of the sway velocity, which is one of the states of the mathematical model describing the dynamics of the ship in he...

The paper considers the dynamic positioning problem for a ship having only two independent controls, namely surge force and yaw moment. A time-varying feedback control law including integral action is developed and proved to exponentially stabilize both the North and East positions and the orientation of the ship. Experimental results are presented where the controller is implemented on a model...

The paper considers the dynamic positioning problem for a ship having only two independent controls, namely surge force and yaw moment. A time-varying feedback control law including integral action is developed and proved to exponentially stabilize both the North and East positions and the orientation of the ship. Experimental results are presented where the controller is implemented on a model...

These paper present a new approach to introduce ship wake in synthetic aperture radar simulation. Usual ship wakes models are based on hydrodynamics studies and give a good description of these phenomena but need important computation time. In our study, we propose an original model which is instigated from Kelvin wakes. The wake description (wave length, direction...) is defined from the ship ...

Simulation and Virtual Prototyping got into many difficulties before becoming a part of the traditional ship building processes. However the greater complexity of constructions and boarded systems demand more complete design verifications. Even if a boarded system is analogous to the land one, it must stand the high intensity of the induced ship motion. The forecasting of the ship motions has a...

This paper presents the algorithm for target point detection using image based methods and sensor networks to monitor the accuracy control for assembling ship blocks in a ship yard area. Dimensional control of the product at all assembling level accounts for a profitable ship production. An accuracy error at each stage accumulates to a higher value which leads to low level of ship productivity....

We present a simulation model for long-term optimal design of channel depths in which the risk of ship grounding due to wave impacts can be assessed for every ship transit. This new model includes four main components: (1) an exponential probability law for the number of ship departures1 (2) a parametric model of the wave-induced ship motions1 (3) modeling effects of tidal variations on the cha...