-
Group Technology (GT)Prof. Hyun Chung
Mar. 12 2015
1
Group Technology
Similarity matrix
Dendrogram
Direct Clustering Algorithm
2
-
Typical Ship Intermediate Product Groups or Families
Structural Parts
large parallel parts from plate
large non-parallel parts from plate
internal parts from plate
parts from structural shapes/profiles( Ts, Is, etc..)
built-up parts from plates
built-up parts from shapes/profiles
3
Typical Ship Intermediate Product Groups or Families
Small internal subassemblies from plates and shapes
(foundations, brackets, floors)
Large stiffened flat panels
Large stiffened curved panels
Large stiffened internal structure such as transverse web
Large components from plates and shapes such as large
foundations
4
-
Typical Ship Intermediate Product Groups or Families
Structural sub-blocks made up of the structural intermediate
products mentioned previously
Blocks (sections, modules)
flat
curved
special flat
special curved
superstructure
5
Typical Ship Intermediate Product Groups or Families
Outfitting parts (manufactured or purchased)
piping spools
HVAC ducting
electrical panels
valves
pumps
lighting fixtures
shafts
etc...
6
-
Typical Ship Intermediate Product Groups or Families
Outfitting assemblies (on-unit, unit, modules)
large and small machinery assemblies/units
large and small pipe assemblies/units
special (hatch covers & coamings, masts, etc)
7
Typical Ship Intermediate Product Groups or Families
Outfitted Blocks (on-block)
blocks that have had outfit parts and/or assemblies installed or
after assembly, but prior to erection. Usually a hot stage prior to
painting and a cold stage after
8
-
Typical Ship Intermediate Product Groups or Families
Outfit Zones
Spaces onboard the ship in which outfitting work is completed
after erection and prior to system testing.
Often grouped by predominant work type in the zone to match
skills of specialized work crews.
deck exterior, cargo, hull exterior, accommodations, machinery,
electrical
9
Typical Intermediate Product Flow Through a Shipyard
http://www.akerphiladelphia.com/
10
-
Advantages of GT-based Ship Production
Some significant economies of scale are gained.
Schedule is greatly shortened - repetition of similar work, more
parallel work.
Less skilled labor is required.
Greater possibility for implementing automation.
11
Disadvantages of GT-based Ship Production
Requires exceptional planning to coordinate resources, and
material and information flow.
Requires a very high level of process control with respect to
intermediate product quality and accuracy, and task duration
12
-
Disadvantages of GT-based Ship ProductionRequires formal
production engineering during design
Requires a change in management focus from the final product to
the efficient coordination of all production resources and
intermediate products across all products.
13
