Evaluation of trimaran bow shapes in head seas towing tank tests and results

  • Alin Pohilca “Dunarea de Jos” University of Galati
  • Liviu Galatanu “Dunarea de Jos” University of Galati
  • Costel Iulian Mocanu “Dunarea de Jos” University of Galati
Keywords: trimaran, head seas, towing tank experimental tests

Abstract

The future of naval architecture looks at improved ship designs which can operate in extreme weather while capable of achieving missions either commercial or naval. This demand for new and improved capabilities stipulates for research in this area. The concept of wave piercing bows for trimaran ships was investigated at UCL in the past, and this study aims to supply further information to past research regarding seakeeping behaviour. The contribution of two different wave piercing bow shapes, in terms of sea keeping for a wellknown trimaran destroyer design produced in the past by UCL, is assessed through tank model testing for an available range of frequencies and wave amplitudes. Due to limited facilities and time, the report only analyses heave and pitch motions in head seas. Essentially, the focus is directed towards assessing the impact of a wall-sided and a flared bow shape on trimaran performances, following any changes in heave and pitch equations of motion that they generate (such as differences in damping and stiffness). Finally, the project also describes the whole procedure from model design, model manufacture, model testing, to the understanding and presentation of any valuable findings.

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References

[1]. Austal. (n.d.). „Austal Web Page“. Retrieved July 2011, from http://www.austal.com
[2]. Baptista, R., “Trimaran Coupled Roll and Heave Motion”. MSc Naval Architecture Thesis ReportDept of Mechanical Engineering, UCL, 2007.
[3]. Drake, K. R., “Lecture Notes: MECHNGN01- Structural Dynamics-Random Processes”. United Kingdom: University College London, 2010.
[4]. Fone, D., “Hydrodynamic Loading And Run-Up On a Fixed Elliptic Paraboloid in Waves”, London: MSc Naval Architecture Thesis Report, Dept. of Mechanical Engineering, UCL., 2009.
[5]. Lloyd, A. R., “Seakeeping: Ship behaviour in rough weather”, Andover, Hampshire, United Kingdom: Seakeeping, 1998.
[6]. Manley, D. W., “The Effect of Wave Piercing Bows on Trimaran Transverse Stability”, London: Department of Mechanical Engineering, University College London, 1997.
[7]. Mukundan, V., “Trimaran Roll and Heave Motion”, London: MSc Naval Architecture Thesis Report, Dept. of Mechanical Engineering, UCL, 2007.
[8]. Newland, D. E., “An Introduction to Random Vibrations”, Spectral & Wavelet Analysis (3rd ed.). England: Prentice Hall, 1993.
[9]. Wikipedia, “The Free Encyclopedia”, (n.d.). Retrieved September 10 , 2011, from http://en.wikipedia.org/wiki/File:UCL_Ocean_To wing_Tank.JPG
[10].Wu, G. X., “Lecture Notes MECHGN01- Structural Dynamics-Seakeeping”, United Kingdom: University College London, 2010.
[11].Zhang, J., “Design and hydrodynamic performance of trimaran displacement ships”, London, 2007.
Published
2017-12-31
How to Cite
1.
Pohilca A, Galatanu L, Mocanu CI. Evaluation of trimaran bow shapes in head seas towing tank tests and results. Annals of ”Dunarea de Jos” University of Galati. Fascicle XI Shipbuilding [Internet]. 31Dec.2017 [cited 28Jun.2022];39:25-9. Available from: https://www.gup.ugal.ro/ugaljournals/index.php/fanship/article/view/1090
Section
Articles

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