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International Seminar on Shipbuilding and Ship Machinery in Thailand

 事業名 海外における造船・舶用工業広報セミナーの開催
 団体名 日本中小型造船工業会 注目度注目度5


Aluminum Ship-Building Technology
Hiroshi Ishiwata
Sumidagawa Shipyard Co., Ltd.
 The shipbuilding factory of Sumidagawa Shipyard lie in the center of Tokyo. It is located 8 minutes from Tokyo Station on the Keiyo Line bound for Tokyo Disneyland. It is situated right in front of the train station, and you can see the slipway from the train.
 Since our founding in 1913 as a high-speed vessel builder, throughout our 90-year history, our governmental and public patrol boats, firefighting boats, customs boats, high-speed passenger ships and excursion ships of private companies have earned a reputation excellence. We have exported many governmental boats to foreign countries in South-East Asia, Middle East, and Africa.
 
 Table 1 shows our delivery record in Thailand. In 1955, we started out with sixty-six 30-foot fire fighting boats and two 8-meter water jet fire fighting boats in 1965 and twenty-one 16.5-meter patrol boats in 1969 and after. In 1972, we made a 34-meter high speed search and rescue craft with high tensile steel hull and aluminum alloy superstructure. The ship boasted a speed of 30 KT, which was one of the fastest 30 years ago. In 1980, we delivered the 34-meter motor launch to the Customs Department. Aluminum alloy was used for the hull of ship. This was the last ship we delivered to Thailand.
 
 Let me now talk to you about the current situation of high speed vessels in Japan, the types available, the areas they are used in, their characteristics, and so on.
 
<Table 1>
DELIVERY RECORD
〜FOR THAILAND〜
YEAR SHIP YARD
No.
KIND OF BOAT NAME OF BOAT OWNER
1955 ・・・ 30FEET TYPE FIRE BOAT F-1〜F66 FOREST FIRE BRIGADE
1965 N40-44 8M W.JET FIRE BOAT ・・・ FOREST FIRE BRIGADE
1965 N40-45 8M W.JET FIRE BOAT ・・・ FOREST FIRE BRIGADE
1969 N44-07 16.5M TYPE PATROL BOAT SANTIRAJ513 MARINE POLICE
1969 N44-08 16.5M TYPE PATROL BOAT SANTIRAJ514 MARINE POLICE
1969 N44-09 16.5M TYPE PATROL BOAT SANTIRAJ515 MARINE POLICE
1969 N44-10 16.5M TYPE PATROL BOAT SANTIRAJ516 MARINE POLICE
1969 N44-11 16.5M TYPE PATROL BOAT SANTIRAJ517 MARINE POLICE
1970 N44-44 16.5M TYPE PATROL BOAT SANTIRAJ518 MARINE POLICE
1970 N44-45 16.5M TYPE PATROL BOAT SANTIRAJ519 MARINE POLICE
1970 N44-46 16.5M TYPE PATROL BOAT SANTIRAJ520 MARINE POLICE
1970 N44-47 16.5M TYPE PATROL BOAT SANTIRAJ521 MARINE POLICE
1970 N44-48 16.5M TYPE PATROL BOAT SANTIRAJ522 MARINE POLICE
1971 N46-03 16.5M TYPE PATROL BOAT SANTIRAJ523 MARINE POLICE
1971 N46-04 16.5M TYPE PATROL BOAT SANTIRAJ524 MARINE POLICE
1971 N46-05 16.5M TYPE PATROL BOAT SANTIRAJ525 MARINE POLICE
1972 N46-48 16.5M TYPE PATROL BOAT SANTIRAJ526 MARINE POLICE
1972 N46-49 16.5M TYPE PATROL BOAT SANTIRAJ527 MARINE POLICE
1972 N47-01 34M TYPE HIGH SPEED
SEARCH&RESCUE CRAFT
JASAENYABDY MARINE POLICE
1973 N47-56 34M TYPE HIGH SPEED
SEARCH&RESCUE CRAFT
BHROMYODHI MARINE POLICE
1973 N48-103 16.5M TYPE PATROL BOAT SANTIRAJ528 MARINE POLICE
1973 N48-104 16.5M TYPE PATROL BOAT SANTIRAJ529 MARINE POLICE
1976 N50-22 16.5M TYPE PATROL BOAT SANTIRAJ530 MARINE POLICE
1976 N50-23 16.5M TYPE PATROL BOAT SANTIRAJ531 MARINE POLICE
1976 N50-24 16.5M TYPE PATROL BOAT SANTIRAJ532 MARINE POLICE
1976 N50-25 16.5M TYPE PATROL BOAT SANTIRAJ533 MARINE POLICE
1980 N54-29 34M TYPE MOTER LAUNCH CUSTOMS 1101 CUSTOMS DEPARTMENT
Total of delivered boat 92
 
1. Japan Coast Guard
 In 1954, the first aluminum alloy ship in Japan was built by Mitsubishi Heavy Industries. This was a 15-meter patrol boat called “Arakase” of the Japan Coast Guard. The Agency has already had 80 aluminum ships built for them to date. They are therefore the pioneers for the aluminum alloy ship industry in Japan.
 
<Table 2>
Japan Coast Guard List of Light Alloy Patrol Boats
Model
(---)
Gross
tonnage
(Ton)
Total
length
(M)
Breadth
(M)
Depth
(M)
Speed
(Kt)
No. of
ships
TSURUGI-type 220 ca 50.0 ca 8.0 ca 4.0 40.0 or more 3
SHINZAN-type 180 43.0 7.5 4.0 35.0 4
BANNA-type 195 46.0 7.5 4.0 35.0 7
TAKATSUKI-type 115 35.0 6.7 3.3 35.0 2
MATSUNAMI 204 38.0 8.0 3.3 25.0 1
MURAKUMO-type 125
(former)
30.0 6.3 3.2 30.0 23
HAMAYUKI 100 32.9 6.5 3.3 30.0 1
Former
SHIKINAMI-type
67
(former)
21.0 5.3 2.7 26.0 1
AKIZUKI-type 110
(former)
26.0 6.3 3.0 22.0 9
SHIMAGIRI-type 40 23.0 5.3 2.7 29.0 3
KINUGASA 39 18.0 9.0 2.6 15.0 1
HAYATE-type 7.9 11.9 3.2 1.5 30.0 2
  Total no. of ships 57
 
 The main Japanese shipyards constructing aluminum alloy ships are Mitsubishi Heavy Industries, Mitsui Engineering and Shipbuilding, and Universal Shipbuilding. A recent trend in this industry is an increase in the size and speed of vessels as a solution against illegal ships.
 The mainstream type in Japan is the mono hull deep V. The mono hull is not a comfortable ship to ride because its nose is constantly hit by waves. However, by maneuvering the ship according to sea conditions, it has the most flexibility in terms of seaworthiness, so the mono-hull semi-planing /planing types are commonly used for patrol and police boats. Boats are classified as semi-planing boat or planing boat according to the speed of the ship. This table <Table 3> shows regular boats, excluding special boats such as hydrofoil and ACV.
 
<Table 3 Classification by Ship Speed>
Type Name V s/√Lw 1 Force supporting ship during cruising
Low speed Displacement type Below 3 Water buoyancy
Medium speed Semi-gliding type 3 to 6 Mostly water buoyancy Dynamic lift of water accounts for small percentage
High speed Gliding type 6 to 9 Mostly dynamic lift of water Water buoyancy accounts for small percentage
Ultra-high speed Fully-gliding type Above 9 Dynamic lift of water
 
 It is simpler if ships are classified by speed length ratio Vs/ √Lwl (Vs=speed, Lwl=water line length when stationary) based on length and resistance characteristics. There is a resistance peak called “hump” near speed length ratios 3 and 6. Based on this, the following classification is possible. In the medium and low speed areas, if the displacement and main engine are the same, longer ships are faster. Also increasing the main engine horsepower allows for speed increase.
 However, for high-speed and planing ships, because the ships are supported by the dynamic lift of the water, the shape of the ship base is very important. With the wrong shape, increasing the horsepower of the main engine will not increase the speed.
 For medium and low speed ships, though, it is easy to obtain objective data required for the design, including the data of resistance and self-propelling tests in tank tests <Photo 1>.
 The mode test of high-speed and ultra-high speed ships are designed based on the premise that the model ship and actual ship have similar conditions at the concerned speeds. Planing condition will not be the same if the model is too small. Ideally, models should be around 3 meters, at least 2.5 meters.
 
<Photo 1>
 
 At Sumidagawa Shipyard, we use a 400-meter water tank of the National Maritime Research Institute to conduct model tests. And using information gathered from the tests of actual ships to revise the data of model tests, and put to practical use for the development of ship types.







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更新日: 2019年10月19日

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