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Advanced experimental submarine acoustic testing is used
as the basis for the development of the next generation
submarine and/or improvements to be backfit into existing
submarines. The ultimate measure of success of the theory,
characterization, control technique or treatment is the
demonstration of validity or effectiveness in full scale.
A comprehensive program for acquiring data has evolved that
makes maximum use of the limited resources available for
full-scale testing. This program includes large-scale model
testing as a supplement to full-scale testing.
DDL OMNI provides technical support for large scale model
advanced submarine acoustic tests. There are two phases
to the installation and preparation of large scale models
for testing. The first is concerned with the hull, superstructure,
control surfaces and dome. The second is concerned with
the interior instrumentation used in the testing that could
include hydrophones, shakers, accelerometers, strain gauges,
dynamometers, proximity gauges, pressure gauges, angular
encoders, microphones, signal conditioning, calibration
circuitry and the analog recording devices. A typical evolution
begins with the laboratory checkout and grooming of all
electronics. The model is modified with a scaled model of
the device associated with the test. Then the instrumentation
is installed in the model and tested again. The instrumented
model is transported to the lake test area for execution
of the test. At the completion of the test, a technician
will remove the flight path cassette and analog tape for
analysis ashore. Each tape is analyzed and compared to expected
results from theoretical values or similar historical data
takes. The data is assembled into a detailed report for
the project engineer to disseminate to cognizant authorities.
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