International Journal of Ocean System Engineering

  • 제4권1호
  • /
  • Pages.1-18
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  • 2014
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  • 2233-6478(pISSN)
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  • 2233-7059(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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Hydrodynamic Responses of Spar Hull with Single and Double Heave Plates in Random Waves

  • Sudhakar, S. (Department of Ocean Engineering, IIT Madras) ;
  • Nallayarasu, S. (Department of Ocean Engineering, IIT Madras)
  • 투고 : 2013.12.08
  • 심사 : 2014.02.05
  • 발행 : 2014.02.28
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초록

Heave plates have been widely used to enhance viscous damping and thus reduces the heave response of Spar platforms. Single heave plate attached to the keel of the Spar has been reported in literature (Tao and Cai 2004). The effect of double heave plates on hydrodynamic response in random waves has been investigated in this study. The influence of relative spacing $L_d/D_d$ ($D_d$-the diameter of the heave plate) on the hydrodynamic response in random waves has been simulated in wave basin experiments and numerical model. The experimental investigation has been carried out using 1:100 scale model of Spar with double heave plates in random waves for different relative spacing and varying wave period. The influence of relative spacing between the heave plates on the motion responses of Spar are evaluated and presented. Numerical investigation has been carried out to investigate effect of relative spacing on hydrodynamic characteristics such as heave added mass and hydrodynamic responses. The measured results were compared with those obtained from numerical simulation and found to be in good agreement. Experimental and numerical simulation shows that the damping coefficient and added mass does not increase for relative spacing of 0.4 and the effect greater than relative spacing on significant heave response is insignificant.

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참고문헌

  1. Fischer, F.J. and Gopalakrishnan, R, Some ob-servations on the heave behaviour of Spar plat-forms, Journal of Offshore Mechanics and Arc-tic Engineering, 120 (1998) 221-225. https://doi.org/10.1115/1.2829543
  2. Jun B.Rho., Hang S.Choi, Heave and Pitch motions of a Spar platform with Damping Plate, Proceedings of the twelfth International Off-shore and Polar Engineering Conference, Kita-kyushu, Japan, May 26-31, (2002).
  3. Kirti Bairathi, Effect of circular heave plate on Spar response, B. Tech and M. Tech. Thesis, Indian Institute of Technology, Madras, India (2009).
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  5. Nimmy Thankom Phillip, Nallayarasu S., and Bhattacharyya S. K., Damping characteristics of Heave plates attached to Spar hull, Interna-tional Conference on Ocean, Offshore and Arc-tic Engineering, OMAE 83290, Rio de Janeiro, Brazil, July 1-6, (2012).
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  8. Sreeraj, R., Manusha Murali and S. Nallayarasu, Effect of hull geometry on the hydrodynamic response of Spar in regular waves, Journal of Ships and Offshore Structures (2012).
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  13. Yong - Pyo Hong, Dong-Yeon Lee, Yong - Ho Choi, Sam-Kwon Hong, and Se-Eun Kim, An experimental study on the Extreme hydrody-namic responses of a Spar platform in the Heave Resonant Waves, Proceeding of Interna-tional Offshore and Polar Engineering Conference, Seoul, Korea, June 19-24, (2005).

피인용 문헌

  1. Heave motion response of a circular cylinder with the dual damping plates vol.125, 2016, https://doi.org/10.1016/j.oceaneng.2016.07.037