Facilities

Seakeeping and Manoeuvring Basin

Seakeeping and Manoeuvring Basin

CPMC in the Seakeeping and Manoeuvring Basin

Seakeeping and Manoeuvring Basin

Waves generated by the wave maker

The Seakeeping and Manoeuvring Basin is an experimental facility designed to investigate the dynamic characteristics of ships and floating bodies. The basin is 38.8 m long, 24.4 m wide and 2.0 m deep. Water depth can be changed from 0.1 m to 2.0 m. A computerized planer motion carriage(CPMC) and plunger type wave maker are installed in the basin.
We can perform captive model tests and free running model tests in both calm water and waves.

The CPMC consists of a numerically controlled main carriage, a sub carriage and a turntable. The maximum speed of both towing carriages is 1.2 m/s and the maximum angular velocity of the turntable is 30 deg/s. The wave maker consists of 32 plungers. By controlling these plungers individually, regular and irregular waves can be generated in arbitrary directions. The maximum wave height is 0.3 m and the range for the wave period is 0.5 to 4.0 seconds.

One of the excellent features of the basin is the flatness of the bottom. The deviation of the level of the basin bottom is less than ±2 mm over the whole basin area. This enables highly accurate measurements of the shallow water effect on a ship’s motion or the hydrodynamic forces acting on a ship.

High-speed Circulating Water Tank

High-speed Circulating Water Tank

Test Section of High Speed Circulating Water Channel

High-speed Circulating Water Tank

Model Ship Test

The circulating water channel is our experimental facility for measuring forces acting on model ships and other objects and observing water flow patterns around them. This facility looks like a closed duct line placed horizontally. The test section with its opening is located on the top of the closed duct line.
Flow is generated by two impellers that circulate water through the facility.

We can perform not only experiments on ship propulsive performance relating to fuel consumption, but also various fluid experiments. This facility assists education and the understanding of fluid phenomena because it is easy to observe flow around model ships and other objects.

The facility is about 21 m long, 3 m wide and 7 m high. The test section is 6 m long, 2 m wide and 1 m high. The facility is designed to achieve a maximum current speed of 3.3 m/s to study high-speed ships.