Ship Dynamics Laboratory (Physical Scale Laboratory ICTS-I3a-3)
The Ship Dynamics laboratory provides the latest technology for wave generation and test instruments and devices for measuring the movements of ships and other floating structures in the presence of waves and wind.
Dimensions: 150 m long, 30 m wide and 5 m deep.
Not far from the wave generator the tank has a square (10x10) sectional pit of 5 m additional depth, thus achieving total depth of 10 m.
Sixty segments multiflap snake-effect generator with 60 segments. Its total width is 30 m and it has 60 articulated rigid flaps, with hinges located 2 m from the bottom of the channel. The segments or flaps that set up the wave generator are hydraulically operated independently. A wave absorber beach is mounted on the opposite side. This consists of stainless steel shavings, piled together to a thickness of 50 cm.
Types of waves generated::
Longitudinal and oblique regular waves of lengths between 1 and 15 m and heights up to 0.9 m. Oblique waves ±45º.
Long and short-crested irregular waves of significant heights up to 0.4 m.
Standard and arbitrary spectra.
Capacity to reproduce group spectra.
C.P.M.C. (Computerized Planar Motion Carriage)
The CPMC is a set of moving structures above the surface of the tank. It consists of a principal carriage and sub-carriages.
Its basic objective is high-precision reproduction of all possible horizontal movements of a ship or any floating structure at sea.
The principal carriage can be moved uniformly and horizontally along the tank. The three sub-carriages hang below the principle one and are mechanically independent and permit transverse, incremental and rotational motions that are superposed onto the movement of the principle carriage.
The transversal sub-carriage can vary the vertical position of the incremental and rotational sub-carriages, thus adjusting the conditions required for the tests.
The CPMC selfdeveloped software automatically controls the movements of the carriages, their positioning, the position of the model, acquisition of data, evaluation of the test runs, etc.
The following equipment should be mentioned:
Instrumentation for the correct distribution of weights within the ship models and other seagoing structures, to reproduce the mass, inertia and position of center of gravity.
Krypton optical system for undisturbed measurement of the six motions of one or two models.
Dynamometers for up to 6 components of forces and moments on hulls.
Propeller dynamometer for thrust and torque.
Wave height and relative motion probes.
Ultrasonic probe for high precision wave height.
Instrumentation for segmented models.