The estimation of ship heading and speed from a high resolution Synthetic Aperture Radar (SAR) image of ship and its wake is important for monitoring and tracking ships. In order to get a correct and focused image of the moving ships, it is necessary to know the real positions and velocities of the ships. Though the ship can often be imaged clearly, its orientation may be difficult to estimate ...

Due to the random nature of the ship’s motion in an open water environment, the deployment and the landing of air vehicles from a ship can often be difficult and even dangerous. The ability to reliably predict the motion will allow improvements in safety on board ships and facilitate more accurate deployment of vehicles off ships. This paper presents an investigation into the application of art...

Despite the fact that high risk sailing operations are often caused by heavy weather and characterized by vigorous ship motions, the vast majority of (full mission) bridge simulators are Earth fixed. We therefore evaluated the value of adding motion to ship simulation in terms of technical feasibility, measurability of performance, and effects on training. Of eighteen navy personnel, nine recei...

Finnegan, the Massachusetts Institute of Technology Biomimetic Flapping Foil Autonomous Underwater Vehicle (BFFAUV), was developed to explore the use of two degree of freedom oscillating foils as the sole means of propulsion and maneuvering for an underwater vehicle. Two pairs of foils with 0.4m span x 0.1m chord are used, with one pair forward and one pair aft of the center of gravity, with th...

Since large heave and pitch motions of a high-speed multihull seriously affect the navigability ship, it is significant to design effective anti-pitching control for multihull. However, existing controllers are all designed based on deterministic dynamics models have disadvantages low robustness, high dependence experience, complexity performance, such that applicability effectiveness can be se...

In this paper, the mooring dynamic loads and the motion responses of a large container ship in irregular waves with steady wind and current is investigated based on the commercial software AQWA. Comparisons between the time-history motion responses of a large container ship and the change of the mooring line tension in three different cases, non-mooring case, V-type mooring case and I-type moor...

On-site estimation of sea state parameters is crucial for ship navigation. Extensive research has been conducted on model-based utilizing motion responses. Model-free approaches based machine learning (ML) have recently gained popularity, and from time-series responses using deep (DL) methods given promising results. In this study, we apply the novel, attention-based neural network (AT-NN) esti...

A generalized model for secondary frost heave is developed based on the one-dimensional model of O'Neill and Miller. Secondary frost heave arises during freezing owing to cryostatic suction effects that can increase the upward water permeation to facilitate ice-lens growth and increased heave. Nondimensionalization and scaling are used to simplify the model equations and to identify a dimension...

In this paper, the authors proposed simplified formulae of long-term maximum wave-induced vertical motion (surge acceleration, heave and pitch angle) exceedance probability 10-8 expressed as explicit function dominant hullform parameters. First, factors response were identified in a general discussion that did not depend on types response, methodology for development approach was demonstrated. ...