A specially designed circular towing tan~ was developed at the Northeast Fisheries Center (NEFC) for calibrating plankton-net flowmeters . ashore in order to provide more accurate volume estimates and to save valuable shipboard time. Results of a cross-calibration experiment with a flume in use at the Massachusetts Institute of Technology (MIT) demonstrated that calibration factors produced by ...

Recently, several experimental and numerical studies have underlined the advantages of adding clumped weights at discrete positions mooring lines. To confirm influence these weights, an study was performed for a 1:30 scale model line. In this study, weight is modeled as scaled disc placed different along The series experiments has been carried out CEHIPAR towing tank using submerged studless ch...

Onboard guidance systems have emerged to improve the safety of fishing vessels providing skipper with simplified stability information. In last years, authors developed a monitoring system that automatically estimates natural roll frequency vessel. Although performance was acceptable, there were some specific situations where influence external excitations reduced accuracy estimations. this wor...

The present study aims to reduce the pitch motion of an assault amphibious vehicle system in seaways by waterjet impeller revolution rate control. A series seakeeping tests were performed a towing tank with 1/4.5-scale model. This is manufactured as box-shaped hull, and since appendage that generates lift force attached, amount change large according forward speed. For reduction, resultant mome...

One of the main goals ship design process is reduction total resistance, which nowadays even more highlighted due to increasingly stringent rules related energy efficiency. In this paper, investigation impact bow on resistance a yacht carried out for three models by towing tank tests and numerical simulations. The verification validation studies are performed, satisfactory agreement achieved. A...

In recent years, the International Maritime Organization (IMO) has gradually introduced more stringent new Ship Energy Efficiency Design Index (EEDI) bills, and transport ships are inclined to reduce speed increase length square coefficient meet design requirements. However, size of ship model that can be accommodated in towing tank is seriously limited. Under action scale effect, accuracy pred...

This study proposed the newly-designed Pelagic and demersal trawls for fishing vessels operating in Cameroonian waters pelagic grounds. The engineering performances of both were investigated using physical modelling method analytical based on predicted equations. In a flume tank, series model tests Tauti’s law performed to investigate hydrodynamic geometrical assess applicability methods result...