Asagiri-class destroyer

The Asagiri-class destroyer (あさぎり型護衛艦 Asagiri-gata-goei-kan) is a class of destroyer, serving with the Japan Maritime Self-Defense Force (JMSDF). It was the expanded class of general-purpose destroyers of the first generation of the JMSDF.[1]

JS Yūgiri (DD-153), Solent
JS Yūgiri anchored in the Solent
Class overview
Name: Asagiri-class destroyer
Builders:
Operators:  Japan Maritime Self-Defense Force
Preceded by: Hatsuyuki class
Succeeded by: Murasame class
Built: 1986–1989
In commission: 1986–
Completed: 8
Active: 8
General characteristics
Type: General-purpose destroyer
Displacement:
  • 3,500 tons standard,
  • 5,200 tons hull load
Length: 137.0 m (449 ft 6 in)
Beam: 14.6 m (47 ft 11 in)
Draft: 4.5 m (14 ft 9 in)
Depth: 8.8 m (28 ft 10 in)
Propulsion:
Speed: 30 knots (56 km/h)
Range: 6,000 nmi (11,000 km) at 20 kn (37 km/h)
Complement: 220
Sensors and
processing systems:
  • OYQ-6/7 CDS (w/ Link-11)
  • OPS-14/24 air search radar
  • OPS-28 surface search radar
  • OQS-4A hull sonar
  • OQR-1 TASS
Electronic warfare
& decoys:
Armament:
Aircraft carried: 1 × SH-60J/K anti-submarine helicopter

Background

The JMSDF started construction of a Hatsuyuki-class destroyer since FY1977. This was the first class of general-purpose destroyers (汎用護衛艦 Hanyou-goei-kan) under the eight ships / eight helicopters concept.[1] In this concept, each flotilla would be composed of one helicopter destroyer (DDH), five general-purpose destroyers (DD), and two guided missile destroyers (DDG).[2]

However, due to constraints such as budget, design of the Hatsuyuki class was compelled to compromise in terms of C4I function and resistance and durability. Thus, destroyers to be built after FY1983, Asagiri class were changed to an evolved design with expanded hull and enhanced equipment.[1]

Design

The hull has become an enlarged type of Hatsuyuki class, and the hull form is shelter deck style. Also, as the latter batch of the Hatsuyuki class, the upper structure is made of steel, but since it was incorporated into the design from the beginning, the adverse effect on the movement performance was solved.[1]

The engine room was greatly renovated. Instead of the COGOG propulsion system of the Hatsuyuki class, this class has the COGAG propulsion system with four Kawasaki-Rolls-Royce Spey SM1A gas turbines. With thess powerful engines, it was possible to run at 26 knots (48 km/h; 30 mph) by driving only two of the four engines, especially the benefits of tracking a submarine were great. And alternating arrangement was introduced to improve resistance and durability, as in the steam turbine driven destroyers.[1]

Equipment

The earlier batch was equipped the OYQ-6 combat direction system (CDS). This system employed one AN/UYK-20 computer as the same as OYQ-5 tactical data processing system of the Hatsuyuki class, but with expanded memories, it can exchange tactical data via Link-11, which the OYQ-5 does not support. Later, all OYQ-6 systems were upgraded to the OYQ-7, integrated with OYQ-101 ASW Direction System.[1] All ships of this class were later retrofitted with the terminal for the MOF system, the key operational C4I system of the JMSDF which uses the Superbird SHF-SATCOM.[3]

The surface-search radars were replaced by OPS-28. The air-search radars were updated to OPS-14C in the earlier batch, and in the latter batch, OPS-24 3D radars were introduced. This was a maritime version of the land-based J/FPS-3 early-warning radar, and first shipboard active electronically scanned array radar in the world. In the latter batch, electronic warfare support measures systems were also replaced by NOLR-8, completely newly developed with emphasis on anti-ship missile defense.[1]

Its weapon system is basically the same as the Hatsuyuki class except for the minor change on its FCS. However, a new SH-60J was installed as a shipboard helicopter, so a large capacity data link device was installed. The hangar is enlarged in order to accommodate two helicopters, but only one helicopter is used operationally.[1]

Ships in the class

Asagiri, Yūgiri, and Amagiri were named after World War II destroyers. Yamagiri and Asagiri have been converted into training vessels.

Pennant no. Name Laid down Launched Commissioned Builder Home port Note
DD-151
TV-3516
Asagiri 19 September 1986 1988 IHI Corporation, Tokyo Kure   Converted to training vessel (TV-3516) on 16 February 2005
re-converted to DD-151 on March 2012
DD-152
TV-3515
Yamagiri 10 October 1987 1989 Mitsui, Tamano Kure   Converted to training vessel (TV-3515) on 18 March 2004,
re-converted to DD-152 on March 2011
DD-153 Yūgiri 21 September 1987 1989 Sumitomo Heavy Industries Uraga Shipyard Ominato   Involved in the June 3rd, 1996 accidental shootdown of a USN A-6E Intruder, during a life-fire CIWS exercise (part of RIMPAC '96). The two aviators ejected safely, and they were rescued by the Yūgiri. Though a malfunction in the Phalanx CIWS was initially implicated as the cause of the incident, human error was later blamed.
DD-154 Amagiri 9 September 1987[4] 28 February 1989[4] IHI Corporation Maizuru  
DD-155 Hamagiri 4 June 1988 1990 Hitachi, Maizuru Ominato  
DD-156 Setogiri 12 September 1988 1990 Hitachi, Maizuru Ominato  
DD-157 Sawagiri 25 December 1988 1990 Mitsubishi Heavy Industries Nagasaki Shipyard Sasebo  
DD-158 Umigiri 11 September 1989 1991 IHI Corporation Kure  
Asagiri DN-SC-92-06175

JDS Asagiri (DD-151)

JDS Yugiri DD-153

JDS Yūgiri (DD-153)

JMSDF destroyer Amagiri DD-154

JDS Amagiri (DD-154)

JDS-Sawagiri-001 mod

JDS Sawagiri (DD-157)

TV 3516 - JDS Asagiri BB

JDS Asagiri (TV-3516)

DD 158 - JDS Umigiri BB

JDS Umigiri (DD-158)

DD 158 - JDS Umigiri Hangar Deck BB

The hangar deck of JDS Umigiri (DD-158)

DD 158 - JDS Umigiri BB 2

JDS Umigiri (DD-158)

References

  1. ^ a b c d e f g h Kōda 2015, pp. 188-207.
  2. ^ Kōda 2015, pp. 167-169.
  3. ^ Yamazaki 2011.
  4. ^ a b "Asagiri class Destroyer – DD". seaforces.org. Retrieved 11 December 2014.

Books

Article

  • Yamazaki, Makoto (October 2011). "Combat systems of modern Japanese destroyers". Ships of the World (in Japanese). Kaijin-sha (748): 98–107. NAID 40018965310.

External links

30DX frigate

The 30DX (also known as 30FF, 30FFM, or 30DEX) is a Japanese multi-mission frigate in development for the Japan Maritime Self-Defense Force (JMSDF).

Active electronically scanned array

An active electronically scanned array (AESA) is a type of phased array antenna, which is a computer-controlled array antenna in which the beam of radio waves can be electronically steered to point in different directions without moving the antenna. In the AESA, each antenna element is connected to a small solid-state transmit/receive module (TRM) under the control of a computer, which performs the functions of a transmitter and/or receiver for the antenna. This contrasts with a passive electronically scanned array (PESA), in which all the antenna elements are connected to a single transmitter and/or receiver through phase shifters under the control of the computer. AESA's main use is in radar, and these are known as active phased array radar (APAR).

The AESA is a more advanced, sophisticated, second-generation of the original PESA phased array technology. PESAs can only emit a single beam of radio waves at a single frequency at a time. The AESA can radiate multiple beams of radio waves at multiple frequencies simultaneously. AESA radars can spread their signal emissions across a wider range of frequencies, which makes them more difficult to detect over background noise, allowing ships and aircraft to radiate powerful radar signals while still remaining stealthy.

Asagiri

Asagiri may refer to:

Asagiri, Kumamoto, a town in Japan

Japanese destroyer Asagiri, several ships

Asagiri-class destroyer

Asagiri (train), a Japanese limited express train

10157 Asagiri, an asteroid

Combined gas and gas

Combined gas turbine and gas turbine (COGAG) is a type of propulsion system for ships using two gas turbines connected to a single propeller shaft. A gearbox and clutches allow either of the turbines to drive the shaft or both of them combined.

Using one or two gas turbines has the advantage of having two different power settings. Since the fuel efficiency of a gas turbine is best near its maximum power level, a small gas turbine running at its full power is more efficient compared to a twice as powerful turbine running at half power, allowing more-economical transit at cruise speeds.

Compared to Combined diesel and gas (CODAG) or Combined diesel or gas (CODOG), COGAG systems have a smaller footprint but a much lower fuel efficiency at cruise speed and for CODAG systems it is also somewhat lower for high speed dashes.

Guided missile destroyer

A guided-missile destroyer is a destroyer designed to launch guided missiles. Many are also equipped to carry out anti-submarine, anti-air, and anti-surface operations. The NATO standard designation for these vessels is DDG. Nations vary in their use of destroyer D designation in their hull pennant numbering, either prefixing or dropping it altogether. The U.S. Navy has adopted the classification DDG in the American hull classification system.

In addition to the guns, a guided-missile destroyer is usually equipped with two large missile magazines, usually in vertical-launch cells. Some guided-missile destroyers contain powerful radar systems, such as the United States’ Aegis Combat System, and may be adopted for use in an anti-missile or ballistic-missile defense role. This is especially true of navies that no longer operate cruisers, so other vessels must be adopted to fill in the gap.

JDS Yamagiri

JS Yamagiri (DD-152) is an Asagiri-class destroyer in the Japan Maritime Self-Defense Force. (JMSDF)It is the first major combat vessel in the JMSDF to have a female captain. On February 29, 2016 Miho Otani became the first woman to command a destroyer in active duty the service. She had previously commanded a training destroyer. As of 2016 the vessel had around 10 female crew members with designated accommodation and toilets for them. Otani was captain from February 2016 to February 2017.

JS Amagiri

JS Amagiri (DD-154) is an Asagiri-class destroyer of the Japan Maritime Self-Defense Force. Amagiri is currently in active service, homeported in Maizuru, Kyoto, Japan.

Japanese destroyer Amagiri

Two warships of Japan have borne the name Amagiri:

Japanese destroyer Amagiri (1930), a Fubuki-class destroyer launched in 1930 and sunk in 1944

JDS Amagiri, an Asagiri-class destroyer launched in 1986

Japanese destroyer Asagiri

At least three warships of Japan have borne the name Asagiri:

Japanese destroyer Asagiri (1903), a Harusame-class destroyer launched in 1903 and stricken in 1926

Japanese destroyer Asagiri (1929), a Fubuki-class destroyer launched in 1929 and sunk in 1942

JDS Asagiri (DD-151), an Asagiri-class destroyer launched in 1986

Japanese destroyer Yūgiri

Three Japanese destroyers have been named Yūgiri (夕霧 / ゆうぎり, "evening mist"):

Japanese destroyer Yūgiri (1899), a Murakumo-class destroyer of the Imperial Japanese Navy during the Russo-Japanese War

Japanese destroyer Yūgiri (1930), a Fubuki-class destroyer of the Imperial Japanese Navy during World War II

JS Yūgiri (DD-153), an Asagiri-class destroyer of the Japan Maritime Self-Defense Force

List of ship launches in 1986

The list of ship launches in 1986 includes a chronological list of all ships launched in 1986.

List of ship launches in 1987

The list of ship launches in 1987 includes a chronological list of all ships launched in 1987.

List of ship launches in 1988

The list of ship launches in 1988 includes a chronological list of all ships launched in 1988.

List of ship launches in 1989

The list of ship launches in 1989 includes a chronological list of all ships launched in 1989.

Murasame-class destroyer (1994)

The Murasame-class destroyer (むらさめ型護衛艦, Murasame-gata-goei-kan) is a class of destroyers, serving with the Japan Maritime Self-Defense Force (JMSDF). This is the first class of the second-generation general-purpose destroyers of the JMSDF.

OPS-24

The OPS-24 is a shipborne three-dimensional air search radar adopting active electronically scanned array (AESA) technology.

OPS-24 was developed by the Technical Research and Development Institute (TRDI) of the Ministry of Defence, and manufactured by the Mitsubishi Electric. It is the first AESA radar employed on an operational warship, introduced on the JDS Hamagiri (DD-155), the first ship of the latter batch of the Asagiri-class destroyer, launched in 1988. It is also being used on the Murasame and Takanami-class destroyers.

OTO Melara 76 mm

The OTO Melara 76 mm gun is a naval gun built and designed by the Italian defence company Oto Melara. It is based on the Oto Melara 76/62C and evolved toward 76/62 SR and 76/62 Strales.

The system is compact enough to be installed on relatively small warships. Its high rate of fire and availability of range of ammunition make it capable for short-range anti-missile point defence, anti-aircraft, anti-surface, and ground support. Ammunition includes armour-piercing, incendiary, directed fragmentation effects, and a guided round marketed as capable of destroying manoeuvring anti-ship missiles. A stealth cupola is now offered.

The OTO Melara 76 mm has been widely exported and is in use by sixty navies. It has recently been favoured over the French 100mm naval gun for the joint French/Italian Horizon-class frigate project and FREMM frigate.

On 27 September 2006 Iran announced it has started mass production of a marine artillery gun, named the Fajr-27, which is a reverse-engineered Oto Melara 76 mm gun.

RUR-5 ASROC

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Rolls-Royce Marine Spey

The Rolls-Royce Marine Spey is a marine gas turbine based on the Rolls-Royce Spey and TF41 aircraft turbofan engines. The Marine Spey currently powers seven ship classes including the Royal Navy's Type 23 frigates and provides a power output of 19.5 MW (about 26,150HP). The Marine Spey incorporates technology from the Tay and RB211.

Asagiri-class destroyers
Combatant ship classes of the Japan Maritime Self-Defense Force
Helicopter Destroyer (DDH)
Guided Missile Destroyer (DDG)
Destroyer (DD)
All Purpose Destroyer (DDA)
Anti Submarine Destroyer (DDK)
Destroyer Escort (DE)
Frigate Multi-Purpose / Mine(FFM)
Patrol Frigate (PF)
Submarine (SS)
Ocean Minehunters/Minesweepers (MHS)
Coastal Minehunters/Minesweepers (MHC)
Amphibious Warfare

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