Self-reliance achieved in key Navy technologies

November 14th, 2007 - 8:15 am ICT by admin  
Among a variety of new products that Visakhapatnam-based Naval Science and Technological Laboratory (NSTL) on Wednesday handed over to the Navy included various acoustic reducing technologies that Indian navy used to import from other countries like Russia.

The NSTL developed Radar Transparent Ladder and Camouflage Screens, would help the warships avoid being detected by enemies’ surveillance systems.

Beside these, other new products developed by the NSTL include acoustics enclosures, which are specially designed to reduce the noise transmitted by the ship engines.

The NSTL overcame various difficulties to design acoustic enclosures for ships because of various constraints such as space, routing of pipes and harsh marine environment.

The new enclosures for a 500 kW diesel alternator are made of panels with steel and rock wool materials, and could reduce sounds to 30 dB levels. They also have air circulators for heat dissipation.

The acoustic silencer is useful for noise control of intakes or exhausts of air or gas handling systems. These parallel baffle type silencers are filled with sound absorbing materials and could reduce noise to 15 dB levels.

These could be used for ventilation fan and gas turbine, which are installed in frigate class ship.

A two-stage mounting system, normally used where there is a demand for high structure-borne noise attenuation, has also been developed by the NSTL, and it could reduce the radiate noise levels from ship hull. The vibration levels could be reduced up to 25-40 dB by these systems and appreciable reduction of noise level could also be achieved underwater.

A special IR suppression system for naval platforms has also been developed by the NSTL, which could reduce the chances of detection by enemies’ surveillance system.

The device has achieved 90 per cent signature reduction in IR bands, by cooling of exhaust gases, funnel, and custom designed for different configurations of gas turbine and diesel engine exhaust systems.

Another key component in which the country’s defence production wing has achieved self-reliance is the development of low-noise composite blower.

New composites have also been developed, which offer many advantages over other materials used in warships. Due to its high strength to weight ratio and low Radar Cross Section, use of composite are recommended for new construction ship-board applications.

The induction was carried out only after a series of evaluation tests and extensive laboratory tests.

The NSTL’s other achievement in developing technologies for the Indian Navy include the development of a light weight torpedo, which is under production, and the laboratory is currently also working on a heavy weight torpedo.

The Light Weight Torpedo is an anti-submarine weapon, which can be fired from a helicopter very close to enemy submarine to have a definite kill probability. The torpedoes can also be fired in a quick salvo from surface ships using torpedo Triple Tube Launchers (TTL). (ANI)

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