Towing tanks I and III

Towing tank in 2015

Dynamometers for ship model testing:

  • Strain gauge based dynamometers for towing force, open water tests and propulsion tests
  • Test equipment for fixed and floating structures measuring pressure, forces and moments in six degrees of freedom and displacement in six degrees of freedom.
  • Modular force gauges give flexibility for special instrumentation requirements.
  • 3 dimensional wake measurements by use of 5-holes pitot tubes.
  • Strain gauges and inductive propeller nozzle dynamometers.
  • Selspot opto-electronic system for motion measurements in six degrees of freedom.

All dynamometers are compatible with computerized data collection and reduction.

illustrasjonsbilde


Towing tank II

illustrasjonsbilde This tank is primarily intended for student use. It is equipped with a wave maker and a towing carriage. There are large glass windows in the side and bottom of the tank, which makes the tank suitable for vizualisations. The relatively small size means that it is quick and easy to do tests here – students are allowed to work here without supervision.

Dynamometers:

  • 6-component dynamometer, forces and moments in 3-dimensions
  • Selspot opto-electronic system
  • Modular force gauges for special requirements

Data of tanks I, II and III

 

Tank I

Tank II

Tank III

Tank I + III*

Length:

175 metres

25 metres

85 metres

260 metres

Width:

10.5 metres

2.8 metres

10.5 metres

10.5 metres

Depth:

5.6 metres

1.0 metres

10 metres

5.6/10.0 metres

Total weight carriage:

20 tons

0.2 ton

4 tons

20/4 tons

Carriage type:

Tubular member truss

Open bay

Closed beam

Tubular member truss

Wheelbase:

11.04 metres

3 metres

11.04 metres

11.04 metres

Speed range:

0.02-8 m/sec.

0.05-1.75 m/sec.

0-0.5 m/sec.

0.02-12 m/sec.

Maximum acceleration:

1 m/sec2

1 m/sec2

1 m/sec2

1 m/sec2

Driving motors:

4 DC shunt motors in series

1 DC shunt motorwith gear and remotely controlled variator. Wire traction.

2 DC shunt motors

4 DC shunt motors

Power system:

Thyristor controlled

Thyristor controlled

Thyristor controlled

Thyristor controlled

Model size range:

8 metres

1 metre

-

8 metres

Wavemaker:

.

Plunger type Regular and irregular waves

Double flap Regular and irregular waves

Double flapRegular andirregular waves

Maximum wave height:

.

0.3 metre

0.9 metre

0.9 metre

Wave period range:

.

0.25-3 sec.

0.8-5 sec.

0.8-5 sec.

Maximum wave steepness:

.

1:8

1:10

1:10

Wave spectra:

Computer generated, based on 4000 sine components

* Tank I and III can be used simultaneously and also as one long tank (Tank I + III) by removing the gate (12) and wave absorber (15). In tank I + III either of the two carriages can be used.