A New Approach for Seakeeping Performance Assessment of Alternative Hull Forms in Optimization Process
Abstract
Designing hull forms with superior seakeeping
performance demands basic information about the correlation between hull form
parameters and ship motions. Classical model testing is still seen to be the
most accurate way to get information about wave-induced ship motion
characteristics for a hull design. Besides, in the last decades, there is an
increased interest in CFD simulations in hydrodynamic optimization studies.
Generally, due to the sea environment is generally not definite at the
preliminary design phase, hydrodynamic optimization of a ship in terms of
seakeeping is realized by comparing response amplitude operator (RAO) graphs in
head seas. However, in a systematic optimization study, it becomes impossible
to compare these graphs because of the large number of variants. In this study,
a new approach will be presented which enables numerical interpretation of a
large number of RAOs for systematic optimization studies. A script is developed
in order to convert graphical data into numerical and to enable automatic use
in an optimization process. As a case study, a systematic planing hull series
is developed with 120 variants and RAOs are obtained as a result of viscous CFD
analysis. Finally, RAOs of all variants are compared by means of the suggested
approach.
References
- Fridsma G., “A systematic study of the rough water performance of planing boats,” Stevens Institute of Technology, Report 1275, 1969.
- Fridsma G., “A systematic study of the rough water performance of planing boats, irregular waves-Part II,” Stevens Institute of Technology, SIT-DL-71-1495, 1971.
- Savitsky D., Brown W. P., “Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water,” Marine Technology, 1976, 13: 381–400.
- Savitsky D., Koebel, J. G., “Seakeeping of hard chine planing hulls,” Technical Research Bulletin, SNAME, No. R-42, 1993.
- Hearn G.E., Hills W., Sarıöz K., “Making seakeeping analysis work for the designer-a new practical approach,” 19th Scientific and Methodological Seminar on Ship Hydrodynamics, Varna, 1990.
- Kükner A., Sarıöz K., “High speed hull form optimization for seakeeping,” Advances in Engineering Software, 1995, 22: 179-189.
- Sarıöz K., “Seakeeping performance assessment of planning hulls,” 8th International Congress on Marine Technology, Istanbul, 1997.
- Sariöz K., “Performance analysis of seakeeping for surface naval ships (in Turkish),” Proceedings of Naval Architecture and Marine Technology Symposium, Istanbul, 1999.
- Özüm S., Şener B. Yılmaz, H., “A parametric study on seakeeping assessment of fast ships in conceptual design stage,” Ocean Engineering, 2011 38: 1439-1447.
- Arribas F.A.P., Fernandez J.C., “Strip theories applied to the vertical motions of high speed crafts,” Ocean Engineering, 2006, 33(8): 1214-1229.
- Şaylı A., Alkan A.D., Nabergoj R., Uysal A. O., “Seakeeping assessment of fishing vessels in conceptual design stage,” International Journal of Ocean Engineering, 2007, 34: 724-738.
- Sarıöz K., “A hydrodynamic hull form design procedure in conceptual and preliminary ship design,” Ph.D. Thesis, The University of Newcastle upon Tyne, 1993.
- Harries S., Abt, C., “Formal hydrodynamic optimization of a fast monohull on the basis of parametric hull design,” FAST1999-5th International Conference on Fast Sea Transportation, Seattle, Washington, 1999.
- Procedure 7.5-02-07-02.1 Rev.01, “ITTC Recommended Procedures and Guidelines,” 23rd International Towing Tank Conference, Venice, 2002.
Optimizasyon Sürecinde Alternatif Tekne Formlarının Denizcilik Performanslarının Değerlendirilmesi İçin Yeni Bir Yaklaşım
Abstract
Tekne formlarının üstün denizcilik performansı ile
tasarlanması, tekne form parametreleri ile gemi hareketleri arasındaki ilişki
hakkında temel bilgiler gerektirir. Klasik model deneylerinin hala form
tasarımı için dalga kaynaklı gemi hareketi özellikleri hakkında bilgi edinmenin
en doğru yolu olduğu görülmektedir. Ayrıca, son yıllarda, hidrodinamik
optimizasyon çalışmalarında CFD simülasyonlarına ilgi artmaktadır. Genel olarak
bir geminin denizcilik açısından hidrodinamik optimizasyonu, deniz ortamının ön
tasarım aşamasında genellikle belli olmaması sebebiyle, baştan gelen
dalgalardaki genlik karşılık fonksiyonu (RAO) grafikleri karşılaştırılarak
gerçekleştirilir. Bununla birlikte, sistematik bir optimizasyon çalışmasında
çok sayıda değişken nedeniyle bu grafikleri karşılaştırmak imkansız hale gelir.
Bu çalışmada, sistematik optimizasyon çalışmaları için çok sayıda RAO'nun
sayısal yorumunu mümkün kılan yeni bir yaklaşım sunulacaktır. Grafik verilerini
sayısal hale getirmek ve bir optimizasyon işleminde otomatik kullanımı sağlamak
için bir betik geliştirilmiştir. Örnek uygulama olarak, 120 alternatif tekne
formundan oluşan sistematik tekne serisi geliştirilmiştir ve viskoz HAD
analizleri sonucunda RAO'lar elde edilmiştir. Son olarak, tüm alternatiflerin
RAO'ları önerilen yaklaşım ile karşılaştırılmıştır.
References
- Fridsma G., “A systematic study of the rough water performance of planing boats,” Stevens Institute of Technology, Report 1275, 1969.
- Fridsma G., “A systematic study of the rough water performance of planing boats, irregular waves-Part II,” Stevens Institute of Technology, SIT-DL-71-1495, 1971.
- Savitsky D., Brown W. P., “Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water,” Marine Technology, 1976, 13: 381–400.
- Savitsky D., Koebel, J. G., “Seakeeping of hard chine planing hulls,” Technical Research Bulletin, SNAME, No. R-42, 1993.
- Hearn G.E., Hills W., Sarıöz K., “Making seakeeping analysis work for the designer-a new practical approach,” 19th Scientific and Methodological Seminar on Ship Hydrodynamics, Varna, 1990.
- Kükner A., Sarıöz K., “High speed hull form optimization for seakeeping,” Advances in Engineering Software, 1995, 22: 179-189.
- Sarıöz K., “Seakeeping performance assessment of planning hulls,” 8th International Congress on Marine Technology, Istanbul, 1997.
- Sariöz K., “Performance analysis of seakeeping for surface naval ships (in Turkish),” Proceedings of Naval Architecture and Marine Technology Symposium, Istanbul, 1999.
- Özüm S., Şener B. Yılmaz, H., “A parametric study on seakeeping assessment of fast ships in conceptual design stage,” Ocean Engineering, 2011 38: 1439-1447.
- Arribas F.A.P., Fernandez J.C., “Strip theories applied to the vertical motions of high speed crafts,” Ocean Engineering, 2006, 33(8): 1214-1229.
- Şaylı A., Alkan A.D., Nabergoj R., Uysal A. O., “Seakeeping assessment of fishing vessels in conceptual design stage,” International Journal of Ocean Engineering, 2007, 34: 724-738.
- Sarıöz K., “A hydrodynamic hull form design procedure in conceptual and preliminary ship design,” Ph.D. Thesis, The University of Newcastle upon Tyne, 1993.
- Harries S., Abt, C., “Formal hydrodynamic optimization of a fast monohull on the basis of parametric hull design,” FAST1999-5th International Conference on Fast Sea Transportation, Seattle, Washington, 1999.
- Procedure 7.5-02-07-02.1 Rev.01, “ITTC Recommended Procedures and Guidelines,” 23rd International Towing Tank Conference, Venice, 2002.
Details
| Primary Language | English |
|---|---|
| Subjects | Engineering |
| Journal Section | Makaleler |
| Authors | |
| Publication Date | January 31, 2020 |
| Submission Date | October 3, 2019 |
| Acceptance Date | December 9, 2019 |
| Published in Issue | Year 2020 Volume: 7 Issue: 1 |
