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Hydromechanics Laboratory
Hydromechanics lab

Facilities

380 foot Towing Tank

This tank is equipped with two towing carriages, a dual flap wavemaker and a wave-absorbing beach.  The smaller carriage is lighter and capable of towing smaller models at higher speeds.  The larger carriage is heavier and used to tow larger models at lower speeds.  Both carriages are set up with platforms to carry ten or more students, allowing close-up observations of the test subject underway.  A center section of the tank’s beach can be lowered to allow access to a finger pier for ballasting and setting up experiments while the tank is being used for other tests.  Measurements from sensors on towed models are monitored and recorded using an onboard computer.   Digital measurement records and live HD video signals are transferred to the shore-based control room using wireless networks.  Measurement records can be evaluated and analyzed onboard the carriage and on shore.

This facility has been used to test a wide variety of models, including: ships, submarines, planing boats, hydrofoils, surface effect craft, SWATH's, sailboats, offshore platforms, wave buoys, divers, mine arrays, pilings, etc. It is also used to study wave motions and forces, without the use of models.

Length = 380 ft  (116 m)
Breadth = 26 ft  (7.9 m)
Depth of Water = 16 ft  (4.9 m) 
Carriage Travel = 270 ft  (82 m)

DESCRIPTION OF CARRIAGE:

1) High speed – 11,000 lb box girder, steel wheels, round rails; max speed 32 ft/s (9.8 m/s)

2) Low speed – 22,000 lb box girder towed by high speed carriage; max speed 25 ft/s (7.6 m/s)

TYPE OF DRIVE SYSTEM AND TOTAL POWER:

Shore-mounted motors with twin tow cables; two motors @ 200 hp (150 kw) with 400% overload capability; controlled from shore using computer driven touchscreen

OTHER CAPABILITIES:

Large and small horizontal planar motion mechanisms

Open water propeller testing

Water current turbine testing

WAVE GENERATION CAPABILITY:

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

WAVEMAKER TYPE:

Dual flap servo-hydraulic control with dry back

BEACH TYPE AND LENGTH:

4 layers of 2 inch (5 cm) square tubes, 60 ft long (18 m), nominal slope 1:5

INSTRUMENTATION:

Sensors and amplifiers for measuring:  force, moment, distance, angle, rotation rate and position, velocity, acceleration, inertial motion, wave elevation, water particle motion, pressure; multiple 16 bit analog-to-digital USB-based data collection systems with sample rates of 20KHz+

TESTS PERFORMED:

Resistance, self-propulsion, seakeeping, open water propeller, horizontal planar motion, various tests of fixed and moored ocean structures, hydrodynamic forces on submerged bodies, foils, etc., capsize and dynamic stability tests, flow visualization, basic ocean wave mechanics

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