Page 308 - Practical Design Ships and Floating Structures

283

5 CONCLUSIONS

The paper presents rational design criteria based on short and long-term wave statistics. This allows to
model realistic environmental conditions. The automated hull optimization based on these criteria
successfully combines advanced analysis tools, numerical optimization methods and an automated.
parameter controlled shape generation. The improvements in motion behavior of the designs are due to
the precise adaption of important system parameters like added mass, damping by wave radiation. and
exciting fvrces with respect lo environmental conditions. Although the results are based on linear
theory and obviously neglect higher order effects, the method is unmatched when comparing and
optimizing designs. In summary, automated hydrodynamic hull optimization provides an efficient tool
for the improvement of existing and the development of new system concepts in short time.

Acknowledgements

This work has been funded by the German Science Foundation (DFG).
References
Barltrop N. and Adams A. (1 99 1). Dynamics of Fixed Marine Structures. Butterworth- Heinemann Ltd.
Oxford. 3 rd edition.
Birk L. (I 998). Hydrodynamic shape optimization of offshore structures. PhD rhesis. Technische Univenit at Berlin
(D83). Germany.
Birk L. and Harries S. (2000). Automated optimization --- A complementing technique for the
hydrodynamic design of ships and oshore structures. In I"' Int. ConJ on Computer Applications and
Infbrmuiion Technology in the Maritime Industries (COMPIT). Potsdam, Germany.
Clauss G. and Birk L. (1996). Hydrodynamic shape optimization of large offshore structures. Applied
Ocean Research. 18:4 157-171.
Hilleary R. (1 966). The Tangent Search Method of constrained minimization. Tech.Rep./Res. Paper 59,
United States Naval Postgraduate School, Monterey.
Hogben N. and Lumb F. (1967). Ocean Wave Statistics. Her Majesty's Stationery Office, London.
Huang L. (1999). Anwendung von Freiformflachen beim arameter-gesteuerten Entwurf von Oshore-
Plattformen. PhD thesis, Technische Universit at Berlin (D83), Germany. (In German).
Newland D. (1975). Random Mbration andspectral Analysis. Longman Inc., New York.
Newman J. and clavounos P. (1988). The computation of wave loads on large offshore structures. Proc.
of'BOSS Con{. pages 05.622, Trondheim, Norway.
St. Denis M. and Pierson W. (1953). On the motions of ships in confused seas. Transactions. SNAME. 61.
van Rossum G. (2000). Python Reference Manual. Version 2. BeOpen PythonLabs.