Page 24 - Stanochny park

PROFESSIONAL ADVICE

possible to change the size of the ship and its internal volumes. At the same time, the extendable
body has a number of disadvantages, first, the specificity of the flow. By no means, any shape
of the body, with a simple extension with the help of a built-in block, will preserve the existing
driving characteristics, even with an increase in the power of the power plant.
"In the process of implementing a long-term shipbuilding program, new ships for the Navy
should be built on a modular basis. This is our requirement as a customer. The modular principle
of creating ships from ready-made blocks will not only speed up the design, but also reduce the
cost of production," the Russian Defense Ministry says.
In the future, one modular ship will be able to perform tasks that are currently performed
by several ships of different classes.
For example, the Koreans built the world's largest container ship, Triple-E, in three months
for Maersk. It will be able to transport 18,000 twenty-foot containers at an average speed of 19
knots. The giant ship was assembled in just 3 months at the shipyards of Daewoo Shipbuilding
& Marine Engineering (DSME) in Okpo, South Korea.
The principle of modular construction of modern large submarines (nuclear submarines
Examples of block designs of underwater strategic missile cruisers. The assembly of which in
terms of labor intensity is reduced several times is another proof of the advantages of the block
method of assembling bulky structures.
The block principle allows the production of blocks to be dispersed among different factories,
which radically changes the construction time and product quality.
For example, unlike Newport News, where modules are manufactured through the wall
from the final assembly site, Electric Boat manufactures modules at a separate site in Quonset
Point, Rhode Island, 60 km from the main assembly shop in Groton.
One of the modules of the SSN-774 Virginia submarine under construction at the Quonset
Point plant. The modules are mounted vertically on special stands adapted for assembling
structures in the form of bodies of revolution.
Manual body assembly requires a large amount of equipment (clamps, delimiters, hydraulic
lifters), turning any component requires the efforts of 10-15 riggers. The assembly process is
quite lengthy and unsafe. To improve quality and productivity, Electric Boat has developed a
dedicated Automated Frame and Cylinder System (AFC) assembly stand.
AFC is a system of easily configurable fixtures that mechanize and automate the assembly
of frame-cylindrical modules based on rings with a diameter of 9.8 - 12.8 m. The fixtures ensure
the correct shape of the module and allow the structure elements to be rotated for easy welding
and finishing. The devices have lighting, heating, power supply, lifts, work platforms.
With the introduction of AFC, the average labor intensity of manufacturing a module
decreased by an order of magnitude - from 20,000 to 1,400 man-hours. The same gain was
achieved in each individual operation: the time for making the frame decreased from 8000 to
250 hours, the time for manufacturing the case - from 4000 to 280 hours, fitting the case to the
frame from 8000 to 460 hours, fitting the cylinders from 6000 to 530 hours. These innovations
reduced the cost of the Virginia-class boat by more than 25%. The main operations for the
manufacture of submarine structural elements (cutting, machining, bending) are performed using
numerically controlled machines. Part of the Automated
Steel Processing Center, built in 2001, this equipment is
digitally controlled by a design team in Groton.
The completed hull sections are supplied with tanks,
engines, mechanics, torpedo and missile launchers, piping,
electrical equipment, lighting, and transported by barge to
Groton or Newport News for final assembly.
The Project 955 Borey strategic missile submarine
cruiser was developed at the Rubin Central Design Bureau
(St. Petersburg), under the leadership of Chief Designer
V. A. Zdornov. The length of the nuclear submarine is 160
m. The maximum underwater displacement is 24 thousand
tons.
A nuclear power plant is installed on the boat, probably
with a pressurized water-cooled thermal neutron reactor Fig. 4. Nuclear submarine when launching a
VM-5 or similar with a steam-generating unit OK-650V with rocket from a submerged position
a capacity of 190 MW.

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