Page 397 - Practical Design Ships and Floating Structures

312

4 CONCLUDING REMARKS
A new method for construction of a FRP ship is proposed. In the method, hull shape is defined only by
the line elements and conventional moulds for FRP construction method are not used. A 1/3 scale and
a full scale mock-ups of a bow portion is manufactured on a proposed pin jig production system to
identify and solve the difficulties for practical use. The major conclusions of the present paper are as
follows:

(1) A typical hull form of a fishing boat can be developed without any changes in naval architectural
characteristics by combining the Apex method and the Bezier surface method.
(2) Since the whole process of stacking laminas can be done on a flat bed, the loss of materials can
be minimized and FRP plates of uniform qualities produced. Environmental hazard can also be
reduced with improvement in trimming and scrap handling process.
(3) The shape of a developable hull can be represented by line elements placed along the ruling lines
and supported by pin jigs attached on the precision bed. It is possible that the system can be used as an
adjustable mould for deformation of plane plate to form a hull shape, if the number and rigidity of the
elements are enough.
(4) The construction of a ship is completed if adjacent hull surface pieces are joined together and
additional laminas stacked inside to have a necessary thickness. With the procedure, time and cost
needed for mould construction can be eliminated.
(5) In the construction procedure, optical monitoring of the deformation occurs during the curing
process is possible. The measurement will help final finishing of the hull surface after hardening.

Acknowledgement
This work was supported by the Ministry of Maritime Affairs and Fisheries. The authors thank to the
graduate students, Mr. J. Jang, Mr. H. Ahn and Mr. J. Oh supported by BK 21 project for their help.
References

Arthur Edmunds. (1 999). Building a Fiberglass Boat, Bristol Fashion Publications
Calkins D.E., Theodoracatos V.E., Aguilar G.D. and Bryant D.M. (1989). Small craft hull form surface
definition in a high-level computer graphics design environment. T. SNAME 97,85-113.
Kim Byung Chul and Ha Chang Gil. (1997). The new method of FRP boat. Korean Intellectual
Property Oflce, Patent Application No. 97-38729
Kim Hyoungki, Kwon Jongoh, Kim Jaesung and Kim Hyochul. (2000). An experimental study on
optical measurement of deformation of hull surface element, Proceedings of the Annual Autumn
Meeting The Society ofNaval Architects of Korea, 261-264.
Kim Hyochul, Kim Jaesung and Lee Jaekyu. (2000). Mouldless method of construction of FRP Boat,
Seminar on the new method of conshuction of FRP vessel, 84-94.
Kim Hyochul, Advanced Marine Technology Ltd. (2000). Method for production of vessels with
composite material using on an adjustable mould. Korean Intellectual Property Ofice, Patent
Application No. 10-2000-0052754
Lee Jaekyu, Kim Jaesung, Kwon Jongoh and Kim Hyochul. (2000). A production system of vessels
with composite materials using on an adjustable mould, Proceedings of the Annual Autumn Meeting
The Society of Naval Architects of Korea, 84 - 87.
Norskov and Lauritsen 0. (1 985). Practical Application of Single Curved Hull Definition-background,
Application, Sohare and Experience. Computer Applications in the Automation of Shipyard
Operation and Design Elsevier Science 11,485-491.
Yoon S.-H., Lee S.-H. and Lee Y.-G. (2000). A Study on the Hull Form of Developable Fishing Boat.
Proceedings of the Annual Spring Meeting of The Sociev of Naval Architects of Korea, 88-91.