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Hydromechanics Laboratory
Hydromechanics lab

Facilities

120 foot Towing Tank

Ship models up to about six feet in length can be tested for resistance and seakeeping properties. The dual-flap wavemaker at the end of the tank is similar to the wavemaker in the 380 foot tank so wavemaking techniques can be developed here and then reproduced in the larger facility. The tank is set up for normal powered carriage towing (constant velocity) as well as for gravity powered towing (constant force). Measurement signals from the carriage are wired directly to shore using a shielded cable carrier system.  The data acquisition systems on shore are interchangeable with those used in the 380 foot tank.  The smaller tank size allows for shorter delays between runs and the tank can be drained quickly for shallow water testing.

Length = 120 ft (37 m)
Breadth = 8 ft (2.4 m)
Depth of Water = 0 to 5 ft (1.5 m)
Carriage Travel = 85 ft (26 m)

DESCRIPTION OF CARRIAGE:

Unmanned overhead monorail with side rail for roll stabilization

TYPE OF DRIVE SYSTEM AND TOTAL POWER:

Wire tow cable driven by electric motor, 7 HP (5.2 kw); computer controlled using touchscreen

WAVE GENERATION CAPABILITY:

Regular, irregular, and transient water waves, wave frequency range 0.25 to 1.4 Hz

WAVEMAKER TYPE AND EXTENT:

Dual flap servo-hydraulic control with dry back

BEACH TYPE AND LENGTH:

7 layers of 0.5 inch (13 mm) square tubes, 16 ft long (4.9 m), nominal slope 1:3

INSTRUMENTATION:

Identical to equipment used in 380 foot tank

TESTS PERFORMED:

Resistance, self-propulsion, seakeeping, shallow water, various tests of fixed and moored ocean structures, hydrodynamic forces on submerged bodies, foils, etc., capsize tests, flow visualization, basic ocean wave mechanics

OTHER REMARKS:

Side windows in tank, gravity tow capability; shallow water tests (calm water only); short delay between runs

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