This paper describes the development and test in simulation of a coast line following preview controller for the DELFIMx autonomous surface craft (ASC) that takes into account the reference characteristics ahead of the vehicle. The presented solution is based on the definition of an error vector to be driven to zero by the path-following controller. The proposed methodology for controller desig...

The purpose of this paper is to present a system developed for detection andaccurate mapping of ferro-metallic objects buried below the seabed in shallow waters. Thesystem comprises a precise magnetic gradiometer and navigation subsystem, both installedon a non-magnetic catamaran towed by a low-magnetic interfering boat. In addition wepresent the results of a marine survey of a near-shore area ...

Hydrofoil assistance on a catamaran model was tried twenty years ago and an unexpected resistance improvement of 40% initiated the creation of a research project to investigate the effect. Today the research project is still active inspite of designs and model tests resulting in the construction of over 200 Hysucats. Theoretical efforts to determine the hydrodynamics of the Hysucat principle re...

[1] The sea breeze is often a dominant meteorological feature at the coastline, but little is known about its estuarine impacts. Measurements at an anchored catamaran and meteorological stations along the Hudson River and New York Bay estuarine system are used to illustrate some basic characteristics and impacts of the feature. The sea breeze propagates inland, arriving in phase with peak solar...

As a typical multi-hull ship, the pentamaran has wider deck, higher damage stability, and low-speed seaworthiness in harsh sea conditions compared with other types such as catamaran trimaran, having more potential for becoming new type of freight merchant ship line development trend marine economy. In this paper, on basis finite volume method, numerical simulations detailed comparative analysis...

Environmental logistics in Colombian river areas requires solutions that allow economic development based on tourism, without ecological degradation. Therefore, this paper shows the most relevant aspects of project and preliminary design a Pontoon-type vessel with catamaran hull 8 meters length enough power to reach speed 5 knots (85%MCR) built aluminum, which will also have electric propulsion...