Acoustic Stealth
Underwater signature
management of submarine is a
the strategic requirement to counter the
detection by enemy sonar systems.
Passive and active sonar systems
are commonly used to detect ships
or submarines using acoustic wave
propagation. NMRL has developed a
comprehensive underwater acoustic
stealth materials technology to
suppress underwater radiated noise
(for a passive sonar threat) and/
or acoustic target strength (for an
active sonar threat) of IN submarines.
Acoustic rubber tiles are being
extensively used onboard strategic
platforms of the IN. The rubber tile
is a multi-layered structure having
cavities with an outer protective
layer and inner sound-absorbing
layer. The design of the tile can be
altered based on the requirement
and frequency range of interest.
Some of the variables that govern
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