#Navy underwater sound reference lab free#

NUWC Division, Newport can perform the combination of MIL-S-901D (NAVY) Lightweight Shock Tests and CST tests that are the equivalent of the MIL-S-901D (NAVY) Heavyweight Shock Test. Use of the CST saves the time, money, and the extensive coordination necessary to perform open water explosive shock testing.

The shore based CST facility offers explosive shock testing at a fraction of the cost of open water testing. The configuration of the test region of USRD's shock tube is shown in the diagram. The acoustic performance of the transducers can be measured in nearby USRD calibration facilities, both before and after shock test, to determine what changes occurred, if any, due to shock. Transducers to be tested must fit into the 25 centimeters bore and must be able to be mounted on the face of the piston. After the shock wave strikes the transducer, the expanding gas bubble from the explosion accelerates the piston into the chamber, applying the inertial shock to the transducer.

#Navy underwater sound reference lab free#

The transducer under test is mounted on the face of a piston (see diagram of mounting plate below) free to slide in a cylindrical chamber, which forms the termination of the tube.

CST tests can be performed at a rate that is limited only by the mechanics of opening, loading, and filling the tube (usually two or three shots in an 8-hour day). Lateral hammer blows on the Lightweight Shock Test Machine complete the Heavyweight Shock Test simulation. Urick, 'Radiation impedance study, status report for. Pryor, Jr., 'Frequency compensation of electromechanical trans-ducers by feedback techniques,' Naval Ordnance Laboratory, NAVORD Report 6710. In operation, a small explosion produces the pressure shock wave, which travels down the tube and strikes the device under test. and efficiency for a large array on a sphere,' Navy Underwater Sound Laboratory, NUSL Res. The shock tube can simulate both the pressure shock and the inertial shock parallel to the axis of the CST. The Heavyweight Shock Test produces peak free field pressures up to 18 megapascals and inertial shock motion as the Standard Floating Shock Platform responds to the explosion. The Underwater Sound Reference Division has a horizontally mounted, water-filled, Conical Shock Tube (CST) that can be used to test the vulnerability of underwater transducers and associated components and materials to explosive shocks. The Conical Shock Tube is now operated by the Survivability Test Facility of NUWC Division Newport.Ĭontact the program manager at (401) 832-5375 or (401) 832-5372 for more information or to schedule testing.