Asahi-class 25DD Multipurpose Destroyer - Design
Asahi class destroyers have a length of 150.5 meters, 18.3 meters beam, 5.3 meters draft, a standard of 5,050 tons, full load of 6,800 tons. The crew of the ship's crew is 230 officers and sailors. Asahi is a more modernized development variant on the basis of the Akizuki class destroyer. When designing ships, JMSDF engineers did not apply many breakthrough solutions, the ship structure did not have many changes, the rear deck and the dynamic system layout were similar to the Akizuki-class ships. The changes were the electronic system, weapons and front deck area of the ship. Ship DD25 was another step forward in the development of Japanese destroyer classes in 2010 (Hyuga, Izumo and Akizuki). Asahi carries the combat combination and detection facilities similar to these classes.
The main difference was that there is a new type of hydro-accoustic device to enhance the anti-submarine defense (ASW). Asahi has a fairly modern hydrodynamic design following the prevailing stealth trend. The vessel is designed with integrated module which is very convenient for use and maintenance and upgrading. The hull is applied with the solutions of stealth technology, on both sides of the hull is designed with a slope of 10 degrees, in order to reduce the horizontal radial response. The surface of the ship is coated with a special paint capable of absorbing electromagnetic waves, this design reduces 60% of the radar response area, helping the distance to detect Asahi greatly reduced compared to other warhips.
The ship's superstructure is made of aluminum alloy, reinforced with glass plastic to reduce the volume, the upper part of the vessel has components with characteristic shapes - the location to install the antenna multi-purpose radar, similar to OPS-50. The radar complex consists of 8 active phase network radar. Four radars have a target detection function, four other radars - guided missiles. This system is responsible for fighting attacks in the vicinity of low-flying anti-ship missiles. Important areas of the ship are made of Kevlar and steel, this steel has 5 times the durability of ordinary steel. In addition, the ship is also equipped with advanced filtration systems capable of protecting the crew before the biochemical agent NBC.
Asahi class destroyers are equipped with combined gas turbine power system - electric COGLAG including: 2 Ishikawajima Harima LM2500 gas turbine engines (produced under General Electric license) 25,000 horsepower, 2 gas turbine generators 2.8 MW IM400 and 1 1.8 MW S12U diesel generator. These engines connect to each other through 3 gearboxes and 2 clutches, drive out 2 5-leaf propellers that provide a total output of 100,000 horsepower. This combination helps to save fuel, minimize noise when operating, and reduce costs, extend the time between 2 maintenance times. The ship's 4 gas turbine engines are able to switch from the cold state to the maximum power state within 15 minutes. In addition, the ship is also equipped with an advanced radiator to reduce multi-infrared radiation when operating, improve the ability of the enemy to avoid infrared detection methods. This dynamic system helps the ship reach a maximum speed of 30 knots (56 km / h) with a range of 6,000 nautical miles, a cruising speed of 18 knots / h, and ships capable of continuous operation. 50 days at sea.
The COGAG propulsion system has an operating time of up to 30,000 hours before overhauling. In order to ensure that these engines are operating effectively, the JMSDF technical soldiers working under the ship's engine compartment must always be on duty 24 hours at a time, even though the entire system on board is controlled. fully automatic control and monitoring. Working in a loud noise environment requires that JMSDF soldiers work in the engine room on the ship, always using protection to prevent their hearing from being affected.
Most of the equipment on board, even in the engine compartment, is automated and controlled via computer completely. The monitoring system will closely monitor the parameters of the engine system, give timely warnings to the soldiers to remedy, in case one of the engines is in trouble, the clutch allows disconnection. engine operation to perform repairs without affecting the ship's operability. Although it is quite automated, however, the main job of the technical soldiers is to maintain the equipment on board to ensure they operate at the highest efficiency.
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