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Citation:
　Mohammad Reza Tabeshpour,Ebrahim Malayjerdi.Investigation of Pitch Motion Portion in Vertical Response at Sides of a Tension-Leg Platform[J].Journal of Marine Science and Application,2016,(2):175-181.[doi:10.1007/s11804-016-1354-x]
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Investigation of Pitch Motion Portion in Vertical Response at Sides of a Tension-Leg Platform

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Title:
Investigation of Pitch Motion Portion in Vertical Response at Sides of a Tension-Leg Platform
Author(s):
Mohammad Reza Tabeshpour;  Ebrahim Malayjerdi
Affilations:
Author(s):
Mohammad Reza Tabeshpour;  Ebrahim Malayjerdi
Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering Department, Sharif University of Technology, Tehran 11365-11155, Iran
Keywords:
tension-leg platform; heave motion; pitch motion; response amplitude operator; sides of TLP; frequency domain; time domain
分类号:
-
DOI:
10.1007/s11804-016-1354-x
Abstract:
Tendons vertically moor Tension-Leg Platforms (TLPs), thus, a deep understanding of physical tendon stresses requires the determination of the total axial deformation of the tendons, which is a combination of the heave, pitch, and surging responses. The vertical motion of the lateral sides of the TLP is coupled with surge and constitutes a portion of the pitch motion. Tendons are connected to the sides of the TLP; hence, the total displacement of the lateral sides is related to the total deformation of the tendons and the total axial stress. Therefore, investigating the total vertical response at the sides of the TLP is essential. The coupling between various degrees of freedom is not considered in the Response Amplitude Operator (RAO). Therefore, in frequency domain analysis, the estimated vertical RAO is incomplete. Also, in the time domain, only the heave motion at the center of TLP is typically studied; this problem needs to be addressed. In this paper, we investigate the portion of the pitch motion in the vertical response at the sides of the TLP in both the frequency and time domains. Numerical results demonstrate a significant effect of the pitch motion in the vertical motion of the edges of the TLP in some period ranges.

References:

Abaiee MM, Ahmadi A, Ketabdari MJ, 2015. Analytical discussion on stochastic hydrodynamic modeling of support structure of HAWAII WTG offshore wind turbine. Journal of Advanced Research in Ocean Engineering, 1(1), 55-62.
DOI: 10.5574/JAROE.2015.1.1.055
Bhattacharyya SK, Sreekumar S, Idichandy VG, 2003. Coupled dynamics of SeaStar mini tension leg platform. Ocean engineering, 30(6), 709-737.
DOI: 10. 10.1016/S0029-8018(02)00061-6
Das SK, Baghfalaki M, 2015. Modeling of response amplitude operator for coupled sway, roll and yaw motions of a floating body in sinusoidal waves using frequency based analysis. Journal of Offshore Mechanics and Arctic Engineering, 137(3), 031303.
Downie MJ, Graham JMR, Hall C, Incecik A, Nygaard I, 2000. An experimental investigation of motion control devices for truss spars. Marine structures, 13(2), 75-90.
DOI: 10.1016/S0951-8339(00)00010-1
Joseph A, Mangal L, George PS, 2010. Coupled dynamic response of a three-column mini TLP. Journal of Naval Architecture and Marine Engineering, 6(2), 52-61.
DOI: 10.3329/jname.v6i2.2789
Nallayarasu S, Prasad PS, 2012. Hydrodynamic response of spar and semi-submersible interlinked by a rigid yoke–Part I: regular waves. Ships and Offshore Structures, 7(3), 297-309.
DOI: 10. 10.1080/17445302.2011.552208
Nallayarasu S, Sreeraj R, Murali M, 2014. Effect of hull geometry on the hydrodynamic response of spar in regular waves. Ships and Offshore Structures, 9(1), 22-37.
DOI: 10.1080/17445302.2012.704172
Tabeshpour MR, Ataie Ashtiani B, Seif MS, Golafshani AA, 2013. Hydrodynamic damped pitch motion of tension leg platforms. International Journal of Marine Science and Engineering, 3(2), 91-98.
Tabeshpour MR, Golafshani AA, Ataie Ashtiani B, Seif MS, 2006. Analytical solution of heave vibration of tension leg platform. Journal of Hydrology and Hydromechanics, 54(3), 1-10.
Tajali Z, Shafieefar M, 2011. Hydrodynamic analysis of multi-body floating piers under wave action. Ocean Engineering, 38(17-18), 1925-1933.
DOI: 10.1016/j.oceaneng.2011.09.025
Wu HL, Chen XJ, Huang YX, Wang B, 2014. Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure. Ships and Offshore Structures, 9(6), 578-595.
DOI: 10.1080/17445302.2013.867646
Zhang F, Yang JM, LI RP, Chen G, 2007. Numerical investigation on the hydrodynamic performances of a new spar concept. Journal of Hydrodynamics, 19(4), 473-481.
DOI: 10.1016/S1001-6058(07)60142-5
Zeng XH, Shen XP, Wu YX, 2007. Governing equations and numerical solutions of tension leg platform with finite amplitude motion. Applied Mathematics and Mechanics, 28(1), 37-49.
DOI: 10.1007/s10483-007-0105-1

Memo

Memo:
Received date: 2015-09-25;Accepted date: 2016-01-22。
Corresponding author: Mohammad Reza Tabeshpour,E-mail:tabeshpour@sharif.edu
Last Update: 2016-07-06